Serialized Form

serialVersionUID: -8895213711913005041L

logger

SimpleLoggerIF logger

Central logger instance for uploader; never null. This instance may log to the status bar and elsewhere.

logic

AHStandaloneMain logic

Our companion "business-logic" class; never null.

aboutAction

AboutAction aboutAction

The action performed by the "About" menu entry.

exitAction

ExitAction exitAction

The action performed by the "Exit" menu entry.

status

javax.swing.JLabel status

Status bar; never null.

sisListener

AHJWSMain.SISListener sisListener

Single listener instance.

mouseHandler

AHJWSMain.MouseHandler mouseHandler

Handles Mouse over messages on toolbar buttons and menu items; never null.

pollAL

java.awt.event.ActionListener pollAL

ActionListener invoked by pollUI; never null.

serialVersionUID: -8885213711913005041L

logger

SimpleLoggerIF logger

Central logger instance for uploader; never null. This instance may log to the status bar and elsewhere.

logic

UploaderLogic logic

Our companion "business-logic" class; never null.

selectAction

SelectAction selectAction

The action performed by the "Select" button.

aboutAction

AboutAction aboutAction

The action performed by the "About" menu entry.

exitAction

ExitAction exitAction

The action performed by the "Exit" menu entry.

lbb

LocaleBeanBase lbb

Select our locale; never null.

status

javax.swing.JLabel status

Status bar; never null.

sisListener

UploaderMain.SISListener sisListener

Single listener instance.

uib

UploadInfoBean uib

Bean to hold our current view of the exhibit we are naming; never null.

autoSuffixCheckBox

javax.swing.JCheckBox autoSuffixCheckBox

Contains user-selected auto/manual file-type extraction; never null.

mouseHandler

UploaderMain.MouseHandler mouseHandler

Handles Mouse over messages on toolbar buttons and menu items; never null.

uploadTableEditRow

java.util.concurrent.atomic.AtomicInteger uploadTableEditRow

Row marked for editing in uploadTable; -1 if none; never null. Should be ignored if out of range for the current table content.

We use AtomicInteger for lockless thread-safety.

uploadTableModel

javax.swing.table.AbstractTableModel uploadTableModel

The table model instance for the files selected for upload; never null. This doesn't hold any data itself, simply interfaces to the data in logic.selectedFiles.

Call fireTableDataChanged() or something more fine-grained when the data has changed to allow proper redrawing.

queueTableModel

javax.swing.table.AbstractTableModel queueTableModel

The table model for the files queued for upload; never null. This doesn't hold any data itself, simply interfaces to the data in logic.uploadingFiles.

Call fireTableDataChanged() or something more fine-grained when the data has changed to allow proper redrawing.

pollAL

java.awt.event.ActionListener pollAL

ActionListener invoked by pollUI; never null.

serialVersionUID: -2699150966581906068L

readResolve

protected java.lang.Object readResolve()

Deserialise: use constructor for validation, defensive copying, etc.

date

java.lang.Long date

Nominal time/data at which exhibit was added to the Gallery; null or strictly positive. This is null if not available, ie the accession time/date was not recorded, else it is the strictly positive Java time in milliseconds (since 19700101 00:00 UTC).

This can the same as, or later than, the exhibit's timestamp. If earlier than the exhibit's timestamp it may mean that the exhibit has been altered in some way.

size

java.lang.Long size

Size of exhibit file at time of accession; null or strictly positive. This is null if not available, ie the accession time/date was not recorded, else it is the strictly positive number of bytes in the file.

This should be identical to the current exhibit length else it may mean that the exhibit has been altered in some way.

hashCRC32

java.lang.Integer hashCRC32

Accession-time CRC32 whole-exhibit hash or null if not available. We use CRC32 since it is commonly used elsewhere as a file checksum, for example in ZIP files.

hashMD5

ROByteArray hashMD5

Accession-time MD5 whole-exhibit hash or null if not available. If non-null the array is always exactly 16 bytes long.

We use MD5 since it is commonly used elsewhere as a file checksum, and will in practice detect any conceivable corruption in exhibits especially given that we separately record the length.

serialVersionUID: 1227490240470952655L

readObject

private void readObject(java.io.ObjectInputStream ois)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

writeObject

private void writeObject(java.io.ObjectOutputStream oos)
                  throws java.io.IOException

Write out a less-redundant (and more compressible) form of our internal information. We used to write this out in reverse sorted order; now we write in in forward sorted order and the ESA itself should be holding the name in a shared-prefix form.

Throws:

java.io.IOException

timestamp

long timestamp

Timestamp of last exhibit update when this snapshot was taken. Strictly positive unless map is empty, in which case it will be zero.

This information is accessible without holding any locks.

length

int length

Exhibit count, with lock-free access; non-negative. The information in this is redundant but is small and useful for speed and an integrity check, etc.

This emulates the length field of an array while size() emulates the behaviour of collections...

This information is accessible without holding any locks.

serialVersionUID: -2563720785711714753L

readResolve

protected java.lang.Object readResolve()

Deserialise: use constructor for validation, defensive copying, renormalisation, etc.

epgi

ExhibitPropsGlobalImmutable epgi

The immutable global exhibit properties; never null. This is made available as a field for maximum performance.

aeid

AllExhibitImmutableData aeid

The immutable exhibit data; never null. This is made available as a field for maximum performance.

loadedProps

java.util.Map<K,V> loadedProps

Logically immutable map from exhibit name to loadable props (ExhibitPropsLoadable); never null. If an entry for an exhibit is null then we return ExhibitPropsLoadable.EMPTY.

The keys here are canonicalised against aeid so that we don't have duplicate String values knocking about.

Note that keys may actually be String during deserialisation of older formats.

computedProps

java.util.Map<K,V> computedProps

Map from full exhibit name to ExhibitPropsComputable properties; never null. This is a Hashtable to be completely thread-safe, even during serialisation where Hashtable.writeObject() is synchronized.

An instance of ExhibitPropsComputable is created on first demand and posted to the map. No lock is held while the computation is done, so redundant computations are possible, but a high degree of concurrency is available in return.

Entries are never removed from this map, and null is never posted as a value.

Defensively copied during deserialisation.

Note that keys may actually be String during deserialisation of older formats.

longHash

long longHash

The hash of all the data held; guaranteed non-negative. Depends on the timestamp of all the exhibit (aeid) and other loadable information held (eg map data).

Is guaranteed to be zero if the exhibit set is empty, and strictly positive otherwise.

Computable data (and hashNotChangedSince) is excluded from the hash since it is derived from other data that is included in the hash.

constructedAt

long constructedAt

The time that this object was constructed. Strictly positive unless there are no exhibits, in which case this is zero.

We keep this private.

hashNotChangedSince

long hashNotChangedSince

Time since which we claim that the exhibit set/data has not changed; guaranteed non-negative. If a new AllExhibitProperties object is constructed with the aid of an old one, and the longHash has not changed between the two, then this is copied from the old object (except that as a belt and braces measure it is ensured to be no older than the aeid.timestamp), else it is the same as the constructedAt time.

If a new AllExhibitProperties object is constructed from scratch each time then this will be the time that the object was constructed, and so we can regard this as a an `exhibits have not changed since' time.

Strictly positive unless there are no exhibits, in which case this is zero (to prompt early recomputation!).

serialVersionUID: 8608225153676490831L

readObject

private void readObject(java.io.ObjectInputStream ois)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

writeObject

private void writeObject(java.io.ObjectOutputStream oos)
                  throws java.io.IOException

Write out a less-redundant form of our internal information. In particular, since deltas will not usually involve deletion of any exhibits, we make the no-deletions case take no space at all in the serialised form.

Throws:

java.io.IOException

longHashAEPBefore

long longHashAEPBefore

The long hash for the AEP to which the diff is to be applied; guaranteed non-negative.

longHashAEPAfter

long longHashAEPAfter

The long hash for the AEP result; guaranteed non-negative.

hashNotChangedSinceAfter

long hashNotChangedSinceAfter

The timestamp from the AEP result; guaranteed non-negative.

timestampAEIDBefore

long timestampAEIDBefore

The timestamp/hash for the AEIP in the AEP to which the diff is to be applied; guaranteed non-negative.

timestampAEIDAfter

long timestampAEIDAfter

The timestamp/hash for the AEIP in the AEP result; guaranteed non-negative.

lengthAEIDBefore

int lengthAEIDBefore

The exhibit count for the AEIP in the AEP to which the diff is to be applied; guaranteed non-negative.

lengthAEIDAfter

int lengthAEIDAfter

The exhibit count for the AEIP in the AEP result; guaranteed non-negative.

epgiDiff

ExhibitPropsGlobalImmutable.EPGIDiff epgiDiff

The diff from the previous EPGI; may be null to represent no changes to EPGI value.

serialVersionUID: -330320938545639614L

serialVersionUID: -5836076660507008468L

readObject

private void readObject(java.io.ObjectInputStream in)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

writeObject

private void writeObject(java.io.ObjectOutputStream oos)
                  throws java.io.IOException

Write out a minimally-redundant form of our internal information. The more-efficient on-the-wire format also makes defensive reading easier.

We don't write *any* default state.

We must never be asked to serialise if we have a (non-null) dictionary.

We must never be asked to serialise if the text is too long for us to encode.

Throws:

java.io.IOException

readResolve

private java.lang.Object readResolve()

Deserialise: use constructor for validation, defensive copying, etc.

writeReplace

protected java.lang.Object writeReplace()
                                 throws java.io.ObjectStreamException

Returns the best format to write the contained text to the wire. We write ourself to the wire as a java.lang.String if it appears that that would be more efficient and/or safer.

We almost always write ourself out as a String assuming that a good general-purpose compressor such as ZIP will do better than our memory-efficient form given the original text, but if we manage to find a lot of compressibility then we'll save ourself directly.

If a static dictionary is in use then we force serialisation as a String for safety (to avoid ambiguity).

Throws:

java.io.ObjectStreamException

serialVersionUID: -475170579269562789L

readObject

private void readObject(java.io.ObjectInputStream in)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

writeObject

private void writeObject(java.io.ObjectOutputStream oos)
                  throws java.io.IOException

Write out a minimally-redundant form of our internal information. The more-efficient on-the-wire format also makes defensive reading easier.

We don't write *any* default state.

We must never be asked to serialise if we have a (non-null) dictionary.

We must never be asked to serialise if the text is too long for us to encode.

Throws:

java.io.IOException

readResolve

protected java.lang.Object readResolve()

Deserialise: use constructor for validation, etc. Also resolve all empty instances to a single value as a minor optimisation.

serialVersionUID: -1067125631686499751L

readObject

private void readObject(java.io.ObjectInputStream in)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

longHash

long longHash

The hash of all the data held; guaranteed non-negative. Depends all the information held in this object.

attrWords

java.lang.String[] attrWords

The sorted and duplicate-free list of attribute words. All of these should meet the rules for ExhibitNames.validAttributeWord().

We are careful never to share a reference to this outside the class, eg upon deserialisation.

This is the primary store of attribute words information.

SUBJECT_ORDER

java.util.Comparator<T> SUBJECT_ORDER

A Comparator that sorts exhibits by name comparing as equal those that differ only in attribute words. This sorts, in order by:

1. main stem of the name case-insensitively
2. author
3. number-in-series

SMART_ORDER

java.util.Comparator<T> SMART_ORDER

A Comparator that sorts exhibits by name taking account of attribute words. This sorts, in order by:

1. SUBJECT_ORDER to sort into order by exhibit subject
2. attribute words to sort within an exhibit subject
3. ExhibitName.SIMPLE_SMART_ORDER to break ties

equals() is true iff referring underlying comparator's backing AEP has an unchanged longHash.

serialVersionUID: -8518817446313821597L

readResolve

protected java.lang.Object readResolve()

Deserialise: use constructor for validation, defensive copying, etc. Also resolve all empty instances to a singleton as a minor optimisation, and immediately intern() new values so as to immediately discard duplicates (eg of exhibits already known) ASAP to minimise heap churn.

writeReplace

protected java.lang.Object writeReplace()

Serialise: write in the best format for the wire. To get best aggregate compressed size on the wire, eg where the compressed stream contains many similar non-identical instances, we always write out the metadata in its Name (or String) format (minus the outer tags) regardless of how it is actually held in memory. This also makes us immune to changes in the the internals of the other formats and allows use of a static dictionary with Compact7BitString for better in-memory compression (ie effectively cross-instance compression).

This allows a stream compressor to effectively remove the redundancy between instances of this class on the wire as well as internal redundancies.

We assume that there will almost never be identical instances on one stream so we don't mind writing new copies each time where it does happen.

xyDimensions

java.awt.Dimension xyDimensions

X,Y dimensions in pixels for images (moving or still) that have a fixed rectangular dimension, else null. If this is non-null then x and y are strictly positive.

Because Dimension is mutable, we hand out copies of it to callers.

metadata

java.lang.Object metadata

Trimmed metadata for the exhibit (without the constant prefix/suffix); null if none available. This may exist in a number of formats for efficiency "on the wire" and to save space in memory.

• null: no metadata for this exhibit
• String: the simplest format, containing well-formed XML-format metadata (LEGACY)
• ROByteArray: deflated UTF-8 version of String format (LEGACY)
• Compact7BitString: compact byte representation (PREFERRED IN MEMORY)
• Name: compact byte representation (PREFERRED ON THE WIRE)
• byte[]: raw internal Compact7BitString data (LEGACY: NOT SUPPORTED)

Note that this is stored without the redundant top-level tag.

Marked volatile to allow safe lockless update by compact().

serialVersionUID: 8518817446315221597L

readResolve

protected java.lang.Object readResolve()

Deserialise: use constructor for validation, defensive copying, etc. Replace all trivially-stale "empty" values with a single shared value.

NOTE: this may not always preserve all values as expected in future.

writeReplace

protected java.lang.Object writeReplace()

Serialise: replace all trivially-stale values being serialised with TRIVIAL_NEUTRAL. We save all other (non-trivially-stale) values as-is, even if stale, because they may have taken significant resources to compute and may still be much more accurate than any fast approximation we could compute.

NOTE: this is effectively a LOSSY compression mechanism.

staleAfter

long staleAfter

Time until which this data is considered valid; beyond this time is stale. If zero, or before the current time of day, the data is stale.

If the stale date is too far in the future for us to believe, ie much more than would be allowed with this version of the object, then we treat the data as stale in case it is from a version of this object with very different staleness limits or there was a persistence error.

goodness

int goodness

The "goodness" score, -MAX_VALUE is maximally bad and MAX_VALUE maximally good, zero is neutral. This is a composite of many factors, including a small random element.

Has enough significant digits to allow a total ordering even over a very large number of exhibits.

This is nominally logically thought of in the range [-1.0, +1.0].

serialVersionUID: 7048481653530545311L

readResolve

protected java.lang.Object readResolve()
                                throws java.io.ObjectStreamException

Deserialise: use constructor for validation, defensive copying, etc.

Throws:

java.io.ObjectStreamException

writeReplace

protected java.lang.Object writeReplace()

Serialise: strip out stale information before serialising.

voteCorrCacheMap

java.util.Hashtable<K,V> voteCorrCacheMap

Map from vote/correlation key to compute Factor and period for which it was computed; never null after construction/deserialisation. Since all our calculations depend on VLONG events, cache entries need only be invalidated when the period number changes.

One valid key format is a full, valid exhibit name as a Name.ExhibitFull

Other keys are of the form of a CorrType name followed by a colon followed by the rest of the key.

This state can be serialised; it is also recomputed on demand.

We use a Hashtable to be thread-safe.

UPDATE_TIME_LIMIT_MS

int UPDATE_TIME_LIMIT_MS

Time limit for update() in ms; strictly positive. A value of the order of a second or so is probably right. This allows some significant work to get done and cached, but should not block anything (such as page generation) for an unbearable amount of time even to a visitor.

This should still let us get a reasonable amount of work done so that we can rebuild the data incrementally if necessary.

_uCoreLock

java.util.concurrent.locks.ReentrantLock _uCoreLock

Private lock to prevent more than one thread at once expending effort in the core part of update().

_uStartSem

java.util.concurrent.Semaphore _uStartSem

Counting semaphore to limit update() first-phase concurrency; never null.

serialVersionUID: -1067125631686499752L

readResolve

protected java.lang.Object readResolve()
                                throws java.io.ObjectStreamException

Deserialise: use constructor for validation, defensive copying, conversion from old formats, etc. Also allows us to (re)normalise the data in this instance, eg to recompute the longHash in case our hash algorithm changes.

Throws:

java.io.ObjectStreamException

locationDBTimestamp

long locationDBTimestamp

The location DB timestamp; strictly positive, or zero if no/empty locationDB.

locationDB

PropertiesDiff locationDB

The (immutable) location DB in properties format; null if absent. We store this in PropertiesDiff format for efficiency on the wire, but convert it to LocationMap before use.

May be absent if there was no location data available at AEP creation or when deserialising an older AEP that has no location data, or as a more efficient way to represent an empty value (we always store an empty value as null for efficiency).

treedescTimestamp

long treedescTimestamp

The treedesc bundle timestamp; non-negative, or may be zero if locationDBis empty/absent.

treedesc

PropertiesBundleDiff treedesc

The (immutable) treedesc bundle; null if absent. We store this in PropertiesBundleDiff format for efficiency on the wire.

May be absent if there was no location data available at AEP creation or when deserialising an older AEP that has no location data, or as a more efficient way to represent an empty value (we always store an empty value as null for efficiency).

longHash

long longHash

The hash of all the data held; guaranteed non-negative. Depends all the information held in this object.

Will be zero if this contains no data.

serialVersionUID: -3566302089418451668L

readResolve

protected java.lang.Object readResolve()
                                throws java.io.ObjectStreamException

Deserialise: use constructor for validation, defensive copying, conversion from old formats, etc. Also allows us to (re)normalise the data in this instance.

Throws:

java.io.ObjectStreamException

locationDBTimestampNew

long locationDBTimestampNew

The new location DB timestamp; strictly positive, or zero for empty diff.

locationDBDiff

PropertiesDiff locationDBDiff

The diffed location DB in properties format; non-empty else null.

treedescTimestampNew

long treedescTimestampNew

The new treedesc timestamp; strictly positive, or zero for empty diff.

treedescDiff

PropertiesBundleDiff treedescDiff

The diffed treedesc in properties format; non-empty else null.

serialVersionUID: 8659120481539311156L

readResolve

protected java.lang.Object readResolve()

Deserialise: use constructor for validation, defensive copying, etc. Also resolve all empty instances to a singleton as a minor optimisation, and immediately intern() new values so as to immediately discard duplicates (eg of exhibits already known) ASAP to minimise heap churn.

writeReplace

protected java.lang.Object writeReplace()

Serialise: write in the best format for the wire. To get best aggregate compressed size on the wire, eg where the compressed stream contains many similar non-identical instances, we always write out (non-null) description in Name format (minus the outer tags) regardless of how it is actually held in memory. This also makes us immune to changes in the the internals of the other formats and allows use of a static dictionary with Compact7BitString for better in-memory compression (ie effectively cross-instance compression).

This allows a stream compressor to effectively remove the redundancy between instances of this class on the wire as well as internal redundancies.

We assume that there will almost never be entirely identical instances on one stream so we don't mind writing new copies each time where it does happen.

description

java.lang.Object description

The description. This can be:

null, meaning no description,

a non-empty String for the literal description

a non-empty byte[] containing a maximally deflated copy of the string without zlib or gzip headers and trailers

a ROByteArray created with compressFromString()

a Name (the preferred on-the-wire form)

a Compact7BitString (the preferred in-memory form).

Support for the byte[] and ROByteArray formats exists mainly for backwards compatibility, ie deserialising old values. All bytes in the source string are of value 0--127 (ie ASCII 7-bit).

Marked volatile to allow safe lockless update by compact().

location

Location.Base location

Location information; null if none. Information here must always be marked "specific".

accession

AccessionData accession

Accession data; null if none.

serialVersionUID: -8233812711746526095L

readResolve

protected java.lang.Object readResolve()

Deserialise: use constructor for validation, defensive copying, etc.

filePath

java.lang.CharSequence filePath

The full (relative) path/name of the exhibit; never null. Must be unique and acceptable to ExhibitName.

The field type is CharSequence to allow reading in of old String-valued instances but allows holding of ExhibitFileName instances at run-time.

All run-time instances will have the same type, except possibly fleetingly during (de)serialisation.

length

long length

The length of the exhibit in bytes; strictly positive.

timestamp

long timestamp

The Java-style timestamp (last-modified-time) of the exhibit (ms); strictly positive. This must be valid Gallery timestamp which means not before the Gallery was created and not too far into the future allowing for clock skew...

serialVersionUID: 2686345754458313314L

readObject

private void readObject(java.io.ObjectInputStream in)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

readResolve

protected java.lang.Object readResolve()

Eliminate duplicate empty objects after deserialisation.

sml

ExhibitThumbnails.Thumbnail sml

Small thumbnail; null means none can be constructed.

std

ExhibitThumbnails.Thumbnail std

Standard thumbnail; null means none can be constructed.

created

long created

Creation timestamp (positive), or zero if none.

serialVersionUID: -1279061480258712366L

readObject

private void readObject(java.io.ObjectInputStream in)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

Mark all mutable members as unshared for safety.

serialVersionUID: -6180248508840300658L

readObject

private void readObject(java.io.ObjectInputStream in)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

userLocale

java.util.Locale userLocale

Locale retrieved by setRequest, or a safe locale value; never null. Volatile to allow thread-safe access without a lock.

serialVersionUID: 2798109831174584816L

readObject

private void readObject(java.io.ObjectInputStream in)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise. Expects validation to happen in readResolve().

Throws:

java.io.IOException

java.lang.ClassNotFoundException

writeObject

private void writeObject(java.io.ObjectOutputStream oos)
                  throws java.io.IOException

Write out a minimally-redundant form of our internal information. The more-efficient on-the-wire format also makes defensive reading easier.

Throws:

java.io.IOException

readResolve

protected java.lang.Object readResolve()
                                throws java.io.ObjectStreamException

Deserialise: validate this instance, coerce mildly-errant values, and eliminate duplicates. Has to handle derived classes too.

Throws:

java.io.ObjectStreamException

prev

Name prev

Non-empty item with which we share a prefix and/or suffix, or null if entire value is empty (equivalent to "") or if there is no shared part(s). May be non-empty if this new value is a prefix/suffix of the prev value.

Is protected since potentially to derived instances.

terminiLengths

short terminiLengths

Termini lengths (unsigned) packed into a single value for efficiency. The prefix bits are the low-order bits.

This is part of the compact serialised state.

serialVersionUID: 8993934283490189577L

serialVersionUID: 2313414189035018929L

serialVersionUID: 3617032881609799000L

serialVersionUID: -4026683164624478589L

serialVersionUID: 3806652319473305560L

readResolve

protected java.lang.Object readResolve()

Deserialise: use constructor for validation, defensive copying, etc. Also resolve all empty instances to a single value as a minor optimisation.

payload

byte[] payload

The (non-null) payload reference.

serialVersionUID: 4100310899376658916L

readResolve

protected java.lang.Object readResolve()

Deserialise: use constructor for validation, defensive copying, etc. Also resolve all empty instances to a single value as a minor optimisation.

payload

int[] payload

The (non-null) payload reference.

serialVersionUID: 654463415117548565L

readResolve

protected java.lang.Object readResolve()

Deserialise: use constructor for validation, defensive copying, etc.

stratum

byte stratum

Our stratum, in range [0,MAX_STRATUM] with 0 indicating master/root, or -1 for unknown.

rootDelay

short rootDelay

Root delay in ms capped to Short.MAX_VALUE; non-negative. Is forced to the MAX_ROOT_DELAY for an unknown stratum.

upstreamName

java.lang.String upstreamName

Upstream server short, unique, printable-ASCII name, "" for root/master/unknown else mirror tag like "cc-xxx"; never null.

upstreamConserving

boolean upstreamConserving

True if upstream is in a power-conserving state or unknown (as fail-safe).

serialVersionUID: -5550500104003361225L

first

java.lang.Comparable<T> first

The first member of the pair.

second

java.lang.Comparable<T> second

The second member of the pair.

serialVersionUID: -4570980722385392467L

first

java.lang.Comparable<T> first

The first member of the triple.

second

java.lang.Comparable<T> second

The second member of the triple.

third

java.lang.Comparable<T> third

The third member of the triple.

serialVersionUID: -5550500104003361224L

first

java.lang.Object first

The first member of the pair.

second

java.lang.Object second

The second member of the pair.

serialVersionUID: -4570980722385392466L

first

java.lang.Object first

The first member of the triple.

second

java.lang.Object second

The second member of the triple.

third

java.lang.Object third

The third member of the triple.

serialVersionUID: -7784138110080680826L

type

java.lang.String type

The type of this location info.

specific

boolean specific

Did this item have its own specific location info?

serialVersionUID: -666396322028089442L

serialVersionUID: 3108417206234772844L

E

Location.DoubleValueAndBounds E

How many degrees East are we?

N

Location.DoubleValueAndBounds N

How many degrees North are we?

Alt

Location.DoubleValueAndBounds Alt

How many metres above mean sea level are we?

serialVersionUID: 4934329592740791248L

serialVersionUID: 3902949361757128661L

Time

Location.LongValueAndBounds Time

What time does the item record?

serialVersionUID: 1802455018686196426L

value

java.lang.Number value

Central value; never null.

error

java.lang.Number error

Error bounds; never null.

serialVersionUID: -8356330012477285265L

timestamp

long timestamp

Timestamp passed in constructor; never negative. Guaranteed zero if the map is empty.

mapFromNamePrefixToLocation

java.util.Map<K,V> mapFromNamePrefixToLocation

Immutable Map from Name prefix to Location.Base; never null. Map from "virtual" exhibit name (prefix) to Location object so that we can reuse previously generated objects. The exhibit name key consists of the top-level section/directory and some leading portion of the name; no intermediate directories are stored.

A HashMap is preferred for speed.

revLookupSection

Name revLookupSection

Reverse section used for reverse matches, or null if none.

revLookupMinWords

int revLookupMinWords

Minimum number of words matched for reverse matches, or non-positive if none.

serialVersionUID: 8715644348905699663L

readObject

private void readObject(java.io.ObjectInputStream in)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

timestamp

long timestamp

Timestamp of this properties set; zero for default/empty set.

gen

java.util.Map<K,V> gen

The (immutable) generic properties map; never null.

WEBSVR_MIN_EX_IMATTR_RECHECK_MS

int WEBSVR_MIN_EX_IMATTR_RECHECK_MS

Web server minimum exhibit-immutable-attributes check interval (ms).

WEBSVR_SYSPROPS_RECHECK_MS

int WEBSVR_SYSPROPS_RECHECK_MS

Web server sysprops (ie most property files including GenProps) (re)check interval (ms).

WEBSVR_MAX_CACHEABLE_EX_BYTES

int WEBSVR_MAX_CACHEABLE_EX_BYTES

Web server maximum-cached-exhibit-prefix-size (bytes).

WEBSVR_TN_CACHEPC

int WEBSVR_TN_CACHEPC

Web server persistent thumbnail cache size limit as percentage of exhibit cache limit value.

WEBSVR_BW_LIMITER

int WEBSVR_BW_LIMITER

Web server precacheing bandwidth-limiter value (max fraction of available bandwidth used on precacheing).

WEBSVR_MAX_EX_BYTES

int WEBSVR_MAX_EX_BYTES

Web server maximum exhibit size (32-bit value, bytes).

WEBSVR_META_KEYWORDS

java.lang.String WEBSVR_META_KEYWORDS

Keywords list for HTML meta header ("" if none; not null).

WEBSVR_META_DESCRIPTION

java.lang.String WEBSVR_META_DESCRIPTION

Description for HTML meta header ("" if none; not null).

WEBSVR_BG_IMAGE

java.lang.CharSequence WEBSVR_BG_IMAGE

JPEG exhibit to use as a background image (null if none). Should be Name.ExhibitFull but could be String from deserialising old format.

WEBSVR_SIMPLEAD_ALLOW

boolean WEBSVR_SIMPLEAD_ALLOW

On/off switch for simple banner ad code, enabled by default.

totalSimpleAdWeight

int totalSimpleAdWeight

Total weight of all simple ads; non-negative. Strictly positive if there are some simple ads.

simpleAds

GenProps.SimpleAd[] simpleAds

Sorted array of simple ads, no empty slots, non-zero length; or null if no simple ads.

classifiedAds

GenProps.ClassifiedAd[] classifiedAds

Array of classified ads, no empty slots or duplicates, non-zero length; or null if no classified ads.

authDB

java.util.SortedMap<K,V> authDB

Immutable SortedMap of author details, no empty or duplicate slots; non-zero length, or null if none.

popWeights

java.util.Map<K,V> popWeights

Map from String token to Byte ([-100,+100]) weighting. We cheat and assume the that sets of author, attribute words and extensions are disjoint, and so we keep all the mappings in a single table!

WEBSVR_EX_HOTLINK_LIMITER

byte WEBSVR_EX_HOTLINK_LIMITER

Web server hotlinked-download-limiter value (as percentange of all exhibit downloads).

WEBSVR_EX_HOTLINK_DIVERT_URL

java.lang.String WEBSVR_EX_HOTLINK_DIVERT_URL

Web server hotlinked-download-limiter divert graphic URL value.

hotLinkAllowHosts

java.util.Set<E> hotLinkAllowHosts

Immutable Set of "allow" hotlink hosts (normalised host names); can be null for no such hosts.

hotLinkAllowHostsRegex

java.util.regex.Pattern hotLinkAllowHostsRegex

Immutable compiled case-insensitive regex pattern for hotlink allow hosts not in literal list; can be null if no such "regex-match" hosts.

hotLinkDisallowHosts

java.util.Set<E> hotLinkDisallowHosts

Immutable Set of "disallow" hotlink hosts (normalised/stripped/lower-cased host names); can be null for no such hosts.

hotLinkDisallowHostsRegex

java.util.regex.Pattern hotLinkDisallowHostsRegex

Immutable compiled case-insensitive regex pattern for hotlink disallow hosts not in literal list; can be null if no such "regex-match" hosts.

DNSBLs

java.util.Set<E> DNSBLs

Immutable Set of DNS BLs (normalised DNS zone names); can be null for no such hosts.

serialVersionUID: 2647433856891011944L

readObject

private void readObject(java.io.ObjectInputStream in)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

auth

java.lang.String auth

Author initials: must be syntactically valid; non-null.

name

java.lang.String name

Author name: must be pure 7-bit printable ASCII HTML with possible entities; not empty, non-null.

www

java.lang.String www

Author home-page URL: should be syntactically valid URL or null.

email

java.lang.String email

Author email: should be syntactically valid email address or null.

desc

java.lang.String desc

Description HTML code as 7-bit ASCII; never empty but can be null.

serialVersionUID: 8848447664623542985L

readResolve

protected java.lang.Object readResolve()

Deserialise: validate and eliminate duplicates coming off the wire.

regex

java.lang.String regex

Valid case-sensitive regular expression to match a substring of a URI path, never null nor empty.

code

java.lang.String code

HTML code as 7-bit ASCII; non-null, non-zero length.

start

long start

Start time (+ve UTC ms) or zero if no start time.

end

long end

Start time (+ve UTC ms greater than 'start') or zero if no end time.

lang

java.lang.String lang

Language/locale filter; two-letter lower-case language code or null if none.

countries

java.lang.String countries

Country code; comma-separated list of lower-case ccTLD codes or null if none.

serialVersionUID: 4307342238100184047L

readObject

private void readObject(java.io.ObjectInputStream ois)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise. This intern()s all the Properties set names.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

writeObject

private void writeObject(java.io.ObjectOutputStream oos)
                  throws java.io.IOException

Write out a less-redundant form of our internal information. In particular, since deltas will not usually involve deletion of any values, we make the no-deletions case take no space at all in the serialised form.

Throws:

java.io.IOException

readResolve

protected java.lang.Object readResolve()
                                throws java.io.ObjectStreamException

Deserialise: discard duplicate empty values.

Throws:

java.io.ObjectStreamException

sizeBefore

int sizeBefore

The input bundle count as a sanity-check; guaranteed non-negative.

sizeAfter

int sizeAfter

The output bundle count as a sanity-check; guaranteed non-negative.

serialVersionUID: 4307342238100184046L

readObject

private void readObject(java.io.ObjectInputStream ois)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise. This intern()s all the names and values that it loads.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

writeObject

private void writeObject(java.io.ObjectOutputStream oos)
                  throws java.io.IOException

Write out a less-redundant form of our internal information. In particular, since deltas will not usually involve deletion of any values, we make the no-deletions case take no space at all in the serialised form.

Throws:

java.io.IOException

readResolve

protected java.lang.Object readResolve()
                                throws java.io.ObjectStreamException

Deserialise: including discarding duplicate empty values.

Throws:

java.io.ObjectStreamException

sizeBefore

int sizeBefore

The entry count for the input properties set as a sanity-check; guaranteed non-negative.

sizeAfter

int sizeAfter

The entry count for the output properties set as a sanity-check; guaranteed non-negative.

serialVersionUID: -7930248582951598929L

timestamp

long timestamp

Timestamp of this properties set.

gensec

java.util.Properties gensec

Internal private copy of GENSECPROPS_PREFIX properties.

TUNNEL_CLIENT_LIST

java.lang.String TUNNEL_CLIENT_LIST

Web server permitted tunnel client list by IP address, space separated, never null.

serialVersionUID: 8025048065146981171L

onlyAllowExtant

boolean onlyAllowExtant

If true, limit selections to existing values in the database. If false, a wider range of legal values is allowed.

If true, file types and authors can only be selected from ones already represented in the production database.

aep

AllExhibitProperties aep

The AllExhibitProperties data; never null. Must be set before other property values are set.

suffix

java.lang.String suffix

Suffix selected (starting with ``.''), or "" if none (ie all types OK).

author

java.lang.String author

Author (initials) selected, or "" if none.

category

java.lang.String category

Category selected, or "" if none.

attributes

java.util.List<E> attributes

List of attribute words (String), or empty if none; immutable. We preserve order and repetition unless the dedupAttrs() call is made.

This item may be replaced but is not mutated in situ and is immutable and so can be safely handed out to callers.

serialVersionUID: -6989233428145950946L

uploadAeid

AllExhibitImmutableData uploadAeid

Aeid for upload area; should be set.

number

int number

The number in the current series; never negative. If zero, it will not be inserted into the filename (ie is the default).

mainWords

java.lang.String mainWords

Main body words; valid string of hyphen-separated words where; can be "" but never null. Trailing words may not be attribute words and the final one may not be a number.

description

java.lang.String description

Description text or "" if none; never null. Pure ASCII text, possibly with HTML mark-up.

serialVersionUID: 5094323684152972705L

readObject

private void readObject(java.io.ObjectInputStream ois)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise. This explicitly recovers state for fields by name.

This does not attempt to build some of the transient state assembled by the constructor, nor do defensive copying or significant validation.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

writeObject

private void writeObject(java.io.ObjectOutputStream oos)
                  throws java.io.IOException

Customise how we save state when serialising.

Throws:

java.io.IOException

readResolve

protected java.lang.Object readResolve()

Deserialise: use constructor for validation, defensive copying, conversion from old formats, etc. Also allows us to intern() keys, etc, to conserve memory.

def

SimpleVariableDefinition def

The variable definition; never null.

 

period

EventPeriod period

The event period; never null.

 

intervalNumber

long intervalNumber

The interval number; strictly positive.

authoratitive

boolean authoratitive

If true, this variable has come from the authoritative end-point. Due to an old typo now fossilised in old data, the spelling of this should remain "authoratitive" even though wrong! Thank goodness for encapsulation!

 

totalEventCount

int totalEventCount

Total event count; non-negative.

counts

int[] counts

Counts of the different (non-null) values in non-increasing-count order (ie best first); never null. All counts are non-negative.

Same length as values[].

 

values

java.lang.Object[] values

Values of the different (non-null) events in non-increasing-count order (ie best first); never null. All values are non-null and valid values as determined by the def though note that some values may be substituted with compact alternatives.

Same length as counts[].

The general case is that a value's rank is its position in this array.

 

serialVersionUID: 887928932975973213L

readResolve

protected java.lang.Object readResolve()

Deserialise: use constructor for validation, defensive copying, etc.

rank

int rank

Rank: 0 means top, ie highest count; non-negative.

count

int count

Count is count of this value; strictly positive.

serialVersionUID: -1721389511619513375L

readObject

private void readObject(java.io.ObjectInputStream ois)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

writeObject

private void writeObject(java.io.ObjectOutputStream oos)
                  throws java.io.IOException

Customise how we save state when serialising.

Throws:

java.io.IOException

def

SimpleVariableDefinition def

The (immutable) variable definition; never null.

period

EventPeriod period

The (immutable) event period; never null.

intervalNumber

long intervalNumber

The (immutable) interval number; strictly positive.

totalEventCount

int totalEventCount

Total event count; non-negative. Initially zero.

Mutable; accessed under the instance lock.

counts

java.util.Map<K,V> counts

Map from event value to count of events of that value. Initially empty.

Not thread-safe (access should be protected by other means).

serialVersionUID: -614477516323489097L

readObject

private void readObject(java.io.ObjectInputStream ois)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

def

SimpleVariableDefinition def

The variable definition; never null.

period

EventPeriod period

The event period; never null.

all

EventVariableValueBuffer all

All events being collected, never null. Captures all events ever seen, but may be rescaled to prevent overflow, so should simply be regarded as a reasonably representative sub-sample.

Will never be authoritative.

current

EventVariableValueBuffer current

"Current" events being collected, never null. Will be replaced with new instance as the current one stops being current.

Initially created with value suitable to receive a new event immediately.

Will never be authoritative.

historical

EventVariableValue[] historical

Set of "historical" periods, most-recent at index 0, possibly containing nulls; never null. Initially all nulls.

The intervalNumber of any entry at index i must be current.getIntervalNumber()-1-i.

FIXME: copy defensively during deserialisation.

serialVersionUID: -1932690647089333134L

readResolve

protected java.lang.Object readResolve()

Deserialise: use constructor for validation, defensive copying, etc.

def

SimpleVariableDefinition def

The variable definition; never null.

byPeriod

java.util.EnumMap<K extends java.lang.Enum<K>,V> byPeriod

Non-empty Map from period to period row; never null. Logically immutable once created (and thus thread-safe), though the values remain mutable.

serialVersionUID: -2320309863687936784L

readResolve

protected java.lang.Object readResolve()
                                throws java.io.ObjectStreamException

Deserialise: validate and eliminate duplicates coming off the wire. Ensures that there is never more than one copy of any given InstanceID value in memory (other than transiently).

Throws:

java.io.ObjectStreamException

ID

long ID

Unique (positive) long ID from a cryptographically-good random-number source.

serialVersionUID: 2361192791747313629L

readResolve

protected java.lang.Object readResolve()
                                throws java.io.ObjectStreamException

Deserialise: use constructor for validation, defensive copying, etc. We also use this to eliminate duplicate copies and thus conserve memory. We attempt to effectively intern() the entire definition and also the name.

Throws:

java.io.ObjectStreamException

name

java.lang.String name

The variable name; never null or empty.

type

int type

The variable type; one of the TYPE_XXX values.

persistent

boolean persistent

True if the variable value is to persist through restarts.

readOnly

boolean readOnly

True if the variable is read-only; defaults to false.

event

boolean event

True if the variable is read-only; defaults to false.

evPeriodSubset

java.util.EnumSet<E extends java.lang.Enum<E>> evPeriodSubset

Event period/interval subset (immutable) to be collected, or null if not an event or all to be collected. If this is non-null then it is non-empty.

local

boolean local

True if the variable is local; defaults to true.

maxDiffEventCount

int maxDiffEventCount

Maximum number of different event values retained; defaults to 0.

serialVersionUID: -5094323683052972705L

readResolve

protected java.lang.Object readResolve()

Deserialise: use constructor for validation, defensive copying, etc.

def

SimpleVariableDefinition def

The variable definition; never null.

value

java.lang.Object value

The variable value; null or a type allowed by the definition.

timestamp

long timestamp

The time at which the value object was constructed; strictly positive. This value comes with a deserialised object.

globalMap

java.util.Map<K,V> globalMap

An immutable Map from InstanceID keys to SimpleVariableValues each of the same definition and with no global map. This contains an encapsulation of the constiuent values from each particpating system.

It must be null for local variables.

For global variables where this is non-null it must contain only keys that are distinct InstanceID values, and only values that are SimpleVariableValues with exactly the same definition and a null globalMap.

Is immutable (if non-null) so that it can be returned directly.

Never an empty Map; null is used in this case.

serialVersionUID: 2040799493050847367L

serialVersionUID: -3756427234954341532L

numberOfItems

int numberOfItems

Number of items to be paginated; non-negative. Defaults to zero meaning no items to paginate; any attempt to set it to a negative number sets it to zero.

pg

int pg

The page number of the current page; strictly positive. Defaults to 1; any attempt to set it to an invalid value will set it to 1, which is always safe.

The page number must be positive and less than numberOfPages() unless numberOfPages is 0, in which case the page number must be exactly 1.

This property matches the property named by WebConsts.PAGE_NUMBER_PARAMETER to allow for easy setting of the property from a JSP.

serialVersionUID: -5376824526954786928L

serialVersionUID: 8393863768211031724L

nodePrefix

Name nodePrefix

Store of prefix for the current node. Default value is safe (Name.EMPTY, ie "").

prefixList

java.util.List<E> prefixList

Store of prefix list. Default value is safe (the empty list).

serialVersionUID: -8656439331186143583L

q

java.lang.String q

The sanitised simple text query, or "" if none.

recentDaysFilter

int recentDaysFilter

The number of recent days to filter for; 0 means no filter.

lastSearchTimeMs

long lastSearchTimeMs

Last search time in ms, -1 if no search yet done.

serialVersionUID: 5283378272843090137L

serialVersionUID: -3815214610456191652L

serialVersionUID: 2376699413596151320L

tfb

TreeFilterBean tfb

Bean that holds cache of selected data in tree-form for us. Only created at init().

serialVersionUID: -4409526925504499328L

expr

Expr expr

The (filter/sorter) expression, or null if not yet set. Accessed under the instance lock.

This is persisted if the object is serialised.

memorySensitiveCache

boolean memorySensitiveCache

If true then led cached value go if we run short of memory, eg hold it via a SoftReference. This is useful for infrequently-accessed and not-too-expensive filters.

This can be set or reset at any time but is only effective when the cache is filled, so is probably done once, before the first set of values is retrieved.

By default this value is true and the cache is memory sensitive, ie won't cause the system to run out of memory.

Accessed under the instance lock.

This is persisted if the object is serialised.

expiryInterval

int expiryInterval

Expiry interval in ms, zero (the default) means no automatic expiry; non-negative. The data may expire in a little less than this.

Is volatile so as to allow access without a lock.

observer

AbstractFilterBean.MyObserver observer

Embedded observer object. Designed to break link between DataSourceBean and our class to allow us to be GCed even if we are recorded as an observer.

This inner object has only a SoftReference to us.

emergencyFreeHook

java.lang.Runnable emergencyFreeHook

Callback for 'emergency free' from MemoryTools; never null after registration. We create and register this when we first call _select() and re-register it when it is called back.

When it is called it unguards any SoftReferences allowing memory to be freed rather than an OutOfMemoryException getting thrown somewhere in the application.

It is assumed that MemoryTools holds this via a WeakReference so that it will not inhibit this instance being GCed.

name

java.lang.String name

Name for this instance; by default null.

serialVersionUID: -3538216625320264998L

serialVersionUID: 1926524023966666518L

acceptableAuthors

java.lang.String[] acceptableAuthors

serialVersionUID: -2337407306687756258L

acceptableCategories

java.lang.String[] acceptableCategories

serialVersionUID: 1246204565122236630L

area

Location.Estd area

Particular location to filter by. If non-null, item must fall within the area delimited by this location to be considered.

serialVersionUID: 7375589684054049955L

serialVersionUID: 8580496714859968839L

prefix

java.lang.String prefix

The substring to match.

serialVersionUID: -5197565900747314559L

subString

java.lang.String subString

The substring to match.

serialVersionUID: -6968644372319333517L

suffix

java.lang.String suffix

The substring to match.

serialVersionUID: -5596318067630417407L

nMax

int nMax

If positive, is the maximum number of exhibits returned.

serialVersionUID: 9042557392754106067L

sortType

java.lang.String sortType

Sort Comparator; null for default (simple) sort.

serialVersionUID: -8775508119553092181L

serialVersionUID: 2078921830149773203L

n

int n

The upper bound on result size.

seed

java.lang.String seed

The seed; if null we use a non-repeatable source.

serialVersionUID: -3097396087855039990L

serialVersionUID: -8932316265828567742L

readObject

private void readObject(java.io.ObjectInputStream ois)
                 throws java.io.IOException,
                        java.lang.ClassNotFoundException

Deserialise.

Throws:

java.io.IOException

java.lang.ClassNotFoundException

logger

WebUtils.ServletLoggerWithFallback logger

Our logger which falls back to System.out if servlet log not available; never null.

iterEPCM

DataSourceBean.AEPLinkedKey iterEPCM

Key for systematic EPCM recomputation (linked to AEP), Iterator; never null.

PROPS_REPOST_INTERVAL_MS

int PROPS_REPOST_INTERVAL_MS

How often do we repost properties (ms, approx); strictly positive. This should be at least once per minute.

_lastGoodPostProps

long _lastGoodPostProps

Note of the last time that we successfully ran raw properties repost without error. Private to _postProps().

destroyed

boolean destroyed

Set true when the servlet is destroyed.

_slave

java.lang.Boolean _slave

Indicates if this is a master or a slave Web server, or not known. "Not known" is indicated by a null value.

This value may be persisted.

Volatile to be accessed without a lock by isSlave() and setSlave().

Must be set non-null to initialise the bean for use.

May be able to be set immediately from the context.

_rebuildJIB_lock

java.util.concurrent.locks.ReentrantLock _rebuildJIB_lock

Private lock for _rebuildJIB. Attempts by another thread to enter the lock are vetoed immediately, preventing other threads from blocking pointlessly.

storeLinked

java.util.concurrent.atomic.AtomicReference<V> storeLinked

Thread-safe (highly-concurrent) AEP-linked store; initialised on demand; never null after construction/deserialisation. May be cleared if the system becomes very short of memory.

storeUnlinked

java.util.concurrent.atomic.AtomicReference<V> storeUnlinked

Thread-safe (highly-concurrent) non-AEP-linked store; initialised on demand; never null after construction/deserialisation. May be cleared if the system becomes very short of memory.

_efh

DataSourceBean.EFH _efh

Set up emergency to clear these stores under extreme memory stress.

serialVersionUID: -1774514190468389217L

initialised

boolean initialised

Private to init(); ensure exactly-once semantics for init().

serialVersionUID: -881322470744786046L

upstream

Expr upstream

The upstream expression pipeline.

serialVersionUID: -7508449420464606209L

serialVersionUID: -7059115865126107312L

filter

FilterIF filter

The filter we apply here; never null.

serialVersionUID: -7947761366290611963L

sorter

SortIF sorter

The sort we apply here; never null.

serialVersionUID: -2497705561191352995L

serialVersionUID: 8710974049842992459L

serialVersionUID: -1276945887652232880L

logger

WebUtils.ServletLoggerWithFallback logger

Our logger which falls back to System.out if servlet log not available; never null.

statsIDTSV

StatsLogger.StatsConfig statsIDTSV

The stats set to which we log general tunnel servlet stats. The unique codes are the constants TSNAME_XXX.

_gSP_cache

SecurityProps _gSP_cache

Cached SecurityProps; private to getSecurityProps(); never null. Volatile so as to allow access without a lock.

_RPC_cache

ExhibitDataTunnelSource.HIRPCCache _RPC_cache

Cache/lock object to optimise handling of incoming RPCs; never null.

messageIDs

DuplicateIDChecker<K> messageIDs

Record of unique request packet IDs around our acceptance window; never null. We use the final MAC segment ID, as that covers the entire frame.

We actually remember IDs for about twice the age implied by the skew so that if our clock is wrong by, or slips by, the maximum skew, we won't start admitting very old duplicate messages.

We should only add IDs if possible when we are already fairly sure of the source and when we have, for example, already checked for acceptable skew, to make any sort of DoS attack against us harder.

We should reject otherwise-acceptable messages that have an ID already present in this Map.

Thread-safe.

serialVersionUID: -8253998074827856644L

serialVersionUID: -1276945667652232880L

logger

WebUtils.ServletLoggerWithFallback logger

Our logger which falls back to System.out if servlet log not available; never null.

statsIDDSV

StatsLogger.StatsConfig statsIDDSV

The stats set to which we log general tunnel servlet stats. The unique codes are the constants DSVNAME_XXX.

serialVersionUID: 8885229711913005041L

logger

SimpleLoggerIF logger

Central logger instance for uploader; never null. This instance may log to the status bar and elsewhere.

logic

ThreeDLogic logic

Our companion "business-logic" class; never null.

status

javax.swing.JLabel status

Status bar; never null.

sisListener

ThreeDMain.SISListener sisListener

Single listener instance.

simpleUniverse

com.sun.j3d.utils.universe.SimpleUniverse simpleUniverse

Our simple universe; only null if Java3D not available or set-up not yet complete. Marked volatile for thread-safe lock-free access.

canvas3D

javax.media.j3d.Canvas3D canvas3D

3D canvas for Java3D to draw on; only null if Java3D not available.

exhibitsBranchGroup

javax.media.j3d.BranchGroup exhibitsBranchGroup

BranchGroup used to hold the exhibits; never null. This is set up to be writable/extendable at runtime so that we can update the exhibits scene as needed.

sliderX

javax.swing.JSlider sliderX

X-axis slider; never null.

sliderY

javax.swing.JSlider sliderY

Y-axis slider; never null.

sliderZ

javax.swing.JSlider sliderZ

Z-axis slider; never null.

currentSet

LightweightMetaDataFetchInterface.GalleryBasicMetaData currentSet

What exhibit set are we currently displaying; never null. When this changes we reconstruct our scene graph.

Marked volatile for thread-safe lock-free access.

Initially an empty set of exhibits.

serialVersionUID: 4321077856636574117L

serialVersionUID: -7990918038988551161L

crumbs

java.util.List<E> crumbs

This is our list of breadcrumbs, in order. We use a Vector so as to be inherently thread-safe.

We expect that usually we will have no more than about four crumbs, and so default to that size.

serialVersionUID: 6755765230040158278L

linkText

java.lang.String linkText

The text of the link; never null nor zero-length.

link

java.lang.String link

The URL (possibly relative); never zero-length but may be null.

serialVersionUID: 8287758876065863228L

serialVersionUID: -6180248508840300659L

serialVersionUID: -200996533296387845L

rndToken

int rndToken

Immutable random token (shared with any clones/copies to save time) for cache-busting in URLs.

sessionVarLiteUI

boolean sessionVarLiteUI

Lite UI; if true we should run a "lite" UI for users on slow modems, etc, else full UI. Full UI (flag off) is the default.

sessionVarLocale

java.util.Locale sessionVarLocale

Session locale: if non-null this overrides any locale information from elsewhere. No override (null) is the default.

Note that this field can only be set to Locales with a valid language code (ie two-letter lowercase) and an optional valid country code (ie two-letter uppercase) and no variant and that are found in our full supported-locales list. Note thae we do this validation since the Locale object does not (SHAME)!

We ignore attempts to set to an unsupported/unsafe/broken locale.

We rely on immutability of the Locale object here.

serialVersionUID: 3079086832160645496L

zoomFactor

int zoomFactor

The current zoom factor. Constrained to lie between MIN_ZOOM and MAX_ZOOM inclusive, and INITIAL_ZOOM unless otherwise set (ie the initial value).

eastOffset

int eastOffset

The East Offset of of the current view from original image. The offset is measured from the centre of the current image to the centre of the original underlying image, where either centre may potentially lie within a pixel or between pixels.

This value is constrained to lie in the range [-BASE_2D_EARTH_MAP_WIDTH/2, +BASE_2D_EARTH_MAP_WIDTH/2].

The initial value is zero.

northOffset

int northOffset

The North Offset of of the current view from original image. As the centre of the user's view goes more north, this becomes more positive.

The offset of measured from the centre of the current image to the centre of the original underlying image, where either centre may potentially lie within a pixel or between pixels.

This value is constrained to lie in the range [-BASE_2D_EARTH_MAP_HEIGHT/2, +BASE_2D_EARTH_MAP_HEIGHT/2].

Note that is is the negative of the change in the y axis which in computer graphics usually has higher values lower down.

The initial value is zero.

serialVersionUID: -6552601635962150780L