org.wikidata.query.rdf.tool.change

Class TailingChangesPoller

java.lang.Object

java.lang.Thread

org.wikidata.query.rdf.tool.change.TailingChangesPoller

All Implemented Interfaces:

Runnable

public class TailingChangesPoller
extends Thread

Tailing changes poller. Polls updates that are certain time behind current time (to give the system time to settle old updates) and if it find some, puts them on the queue. The class tries to stay behind the updates and never catch up with the current stream. In most cases, it will not produce any updates since those are already collected by the main updater, but in some cases it might catch update that the main one skipped.

Nested Class Summary

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

Thread.State, Thread.UncaughtExceptionHandler

Field Summary

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

Constructors

Constructor and Description
TailingChangesPoller(RecentChangesPoller poller, BlockingQueue<RecentChangesPoller.Batch> queue, int tailSeconds)

Method Summary

Modifier and Type	Method and Description
boolean	isOldEnough(Date timestamp) Is this timestamp old enough?
void	run()
void	setPollerTs(long ts) Set main poller timestamp.

Methods inherited from class java.lang.Thread

activeCount, checkAccess, clone, 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

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

TailingChangesPoller

public TailingChangesPoller(RecentChangesPoller poller,
                            BlockingQueue<RecentChangesPoller.Batch> queue,
                            int tailSeconds)

Method Detail

setPollerTs

public void setPollerTs(long ts)

Set main poller timestamp.

Parameters:

ts - Main poller timestamp.

isOldEnough

public boolean isOldEnough(Date timestamp)

Is this timestamp old enough?

Parameters:

timestamp -

Returns:

run

public void run()

Specified by:

run in interface Runnable

Overrides:

run in class Thread