DataSourceBean.BackGroundThread (DHD Multimedia Gallery V1.53.0 Javadoc)

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org.hd.d.pg2k.webSvr.exhibit
Class DataSourceBean.BackGroundThread

java.lang.Object
  java.lang.Thread
      org.hd.d.pg2k.webSvr.exhibit.DataSourceBean.BackGroundThread

All Implemented Interfaces:: java.lang.Runnable

Enclosing class:: DataSourceBean

private static final class DataSourceBean.BackGroundThread
extends java.lang.Thread
extends java.lang.Thread

Operates the poll()ing/background Thread. Retains only a WeakReference to the bean instance to as to allow GC.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread
`java.lang.Thread.State, java.lang.Thread.UncaughtExceptionHandler`

Field Summary
`private int`	`basicBgInterval` Approx average interval between calls to doBG() in ms; maximum interval no more than twice this.
`private java.lang.ref.WeakReference<DataSourceBean>`	`beanInstance` Non-strong reference back to the bean instance; never null but the referent may be.
`private int`	`maxBgInterval` We'll back off to an upper limit if we encounter errors in polling.

Fields inherited from class java.lang.Thread
`MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY`

Constructor Summary
`private`	`DataSourceBean.BackGroundThread(DataSourceBean dsb)`

Method Summary
`void`	`run()` Call poll().

Methods inherited from class java.lang.Thread
activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Thread

activeCount, checkAccess, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

beanInstance

private final java.lang.ref.WeakReference<DataSourceBean> beanInstance

Non-strong reference back to the bean instance; never null but the referent may be.

basicBgInterval

private final int basicBgInterval

Approx average interval between calls to doBG() in ms; maximum interval no more than twice this. Of the order of a second to allow processing of resource-usage monitoring, which requires the fastest processing.

Different per instance to make collisions, etc, less likely.

maxBgInterval

private final int maxBgInterval

We'll back off to an upper limit if we encounter errors in polling. We do this mainly to avoid flooding logs if things are badly broken, but we usually expect to stay at or close to the minimum bg interval.

This is short enough not to completely wreck performance/interaction, or (eg) break the variable pipeline.

Constructor Detail