org.tools4j.elara.log

Class CommittedEventPoller

java.lang.Object

org.tools4j.elara.log.CommittedEventPoller

All Implemented Interfaces:

MessageLog.Poller<Event>, PeekableMessageLog.PeekablePoller<Event>

public class CommittedEventPoller
extends Object
implements PeekableMessageLog.PeekablePoller<Event>

An event poller that works with two underlying pollers to ensure only committed events are passed to the event handler. The lookahead poller reads ahead until either a commit or abort event is found; the event poller then invokes the handler for the corresponding events or skips them if they were aborted.

Constructor Summary

Constructors

Constructor and Description
CommittedEventPoller(PeekableMessageLog<? extends Event> eventLog)
CommittedEventPoller(PeekableMessageLog<? extends Event> eventLog, String id)

Method Summary

Modifier and Type	Method and Description
long	entryId()
boolean	moveTo(long entryId)
PeekableMessageLog.PeekablePoller<Event>	moveToEnd()
boolean	moveToNext()
PeekableMessageLog.PeekablePoller<Event>	moveToStart()
int	peekOrPoll(PeekableMessageLog.PeekPollHandler<? super Event> handler)
int	poll(MessageLog.Handler<? super Event> handler)

Methods inherited from class java.lang.Object

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

Constructor Detail

CommittedEventPoller

public CommittedEventPoller(PeekableMessageLog<? extends Event> eventLog)

CommittedEventPoller

public CommittedEventPoller(PeekableMessageLog<? extends Event> eventLog,
                            String id)

Method Detail

entryId

public long entryId()

Specified by:

entryId in interface MessageLog.Poller<Event>

moveToStart

public PeekableMessageLog.PeekablePoller<Event> moveToStart()

Specified by:

moveToStart in interface MessageLog.Poller<Event>

Specified by:

moveToStart in interface PeekableMessageLog.PeekablePoller<Event>

moveToEnd

public PeekableMessageLog.PeekablePoller<Event> moveToEnd()

Specified by:

moveToEnd in interface MessageLog.Poller<Event>

Specified by:

moveToEnd in interface PeekableMessageLog.PeekablePoller<Event>

moveToNext

public boolean moveToNext()

Specified by:

moveToNext in interface MessageLog.Poller<Event>

moveTo

public boolean moveTo(long entryId)

Specified by:

moveTo in interface MessageLog.Poller<Event>

poll

public int poll(MessageLog.Handler<? super Event> handler)

Specified by:

poll in interface MessageLog.Poller<Event>

peekOrPoll

public int peekOrPoll(PeekableMessageLog.PeekPollHandler<? super Event> handler)

Specified by:

peekOrPoll in interface PeekableMessageLog.PeekablePoller<Event>