org.sandev.TaskHeap.ExternalSync
Class PollingThread

java.lang.Object
  java.lang.Thread
      org.sandev.TaskHeap.ExternalSync.PollingThread

All Implemented Interfaces:

java.lang.Runnable

public class PollingThread
extends java.lang.Thread

A polling thread to periodically check for ExternalPlans that need their time estimations updated.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

java.lang.Thread.State, java.lang.Thread.UncaughtExceptionHandler

Field Summary

protected static int	MAXPAGESIZE The maximum query size used for paged query retrieval.
protected ExternalSyncNode	node Back reference to our parent ExternalSyncNode.

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

PollingThread(ExternalSyncNode node)
Ctor sets the required back reference to the node.

Method Summary

protected void	clearCache() Clear the cache, dump the current memory stats and email them to support.
protected void	doPeriodicTasks() Do our periodic checking tasks.
protected void	error(java.lang.String text) Dump out the given error text to the log.
protected void	info(java.lang.String text) Dump out the given informational text to the log.
protected boolean	isUpToDate(ExternalPlan ep) Return true if this plan has been checked recently enough, false otherwise.
protected java.lang.String	planstr(ExternalPlan ep) Return a shorthand summary string of this external plan.
void	run() Control loop for work to be done.
protected void	updateExternalPlans() Fetch the external plans and update any that need it.

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

MAXPAGESIZE

protected static final int MAXPAGESIZE

The maximum query size used for paged query retrieval.

See Also:

Constant Field Values

node

protected ExternalSyncNode node

Back reference to our parent ExternalSyncNode.

Constructor Detail

PollingThread

public PollingThread(ExternalSyncNode node)

Ctor sets the required back reference to the node.

Method Detail

run

public void run()

Control loop for work to be done.

Specified by:

run in interface java.lang.Runnable

Overrides:

run in class java.lang.Thread

doPeriodicTasks

protected void doPeriodicTasks()
                        throws org.sandev.basics.structs.SandException

Do our periodic checking tasks. To keep this simple each task does its own checking to see if it needs to run.

Throws:

org.sandev.basics.structs.SandException

clearCache

protected void clearCache()

Clear the cache, dump the current memory stats and email them to support.

updateExternalPlans

protected void updateExternalPlans()
                            throws org.sandev.basics.structs.SandException

Fetch the external plans and update any that need it.

Throws:

org.sandev.basics.structs.SandException

isUpToDate

protected boolean isUpToDate(ExternalPlan ep)

Return true if this plan has been checked recently enough, false otherwise.

planstr

protected java.lang.String planstr(ExternalPlan ep)

Return a shorthand summary string of this external plan.

info

protected void info(java.lang.String text)

Dump out the given informational text to the log. Prepend an indentifying prefix so we know it is coming from this thread.

error

protected void error(java.lang.String text)

Dump out the given error text to the log. Prepend an indentifying prefix so we know it is coming from this thread.