org.graylog2.shared.journal

Class NoopJournal

java.lang.Object

com.google.common.util.concurrent.AbstractIdleService

org.graylog2.shared.journal.NoopJournal

All Implemented Interfaces:

com.google.common.util.concurrent.Service, Journal

public class NoopJournal
extends com.google.common.util.concurrent.AbstractIdleService
implements Journal

NoopJournal is used when disk journalling is turned off. In order to avoid propagating the knowledge about whether journalling is happening or not, we inject a no-op journal.

Any use of this journal will throw an IllegalStateException.

Nested Class Summary

Nested classes/interfaces inherited from interface org.graylog2.shared.journal.Journal

Journal.Entry, Journal.JournalReadEntry

Nested classes/interfaces inherited from interface com.google.common.util.concurrent.Service

com.google.common.util.concurrent.Service.Listener, com.google.common.util.concurrent.Service.State

Constructor Summary

Constructors

Constructor and Description
NoopJournal()

Method Summary

Modifier and Type	Method and Description
Journal.Entry	createEntry(byte[] idBytes, byte[] messageBytes)
void	markJournalOffsetCommitted(long offset)
List<Journal.JournalReadEntry>	read(long maximumCount)
protected void	shutDown()
protected void	startUp()
long	write(byte[] idBytes, byte[] messageBytes)
long	write(List<Journal.Entry> entries)

Methods inherited from class com.google.common.util.concurrent.AbstractIdleService

addListener, awaitRunning, awaitRunning, awaitTerminated, awaitTerminated, executor, failureCause, isRunning, serviceName, startAsync, state, stopAsync, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

NoopJournal

public NoopJournal()

Method Detail

createEntry

public Journal.Entry createEntry(byte[] idBytes,
                                 byte[] messageBytes)

Specified by:

createEntry in interface Journal

write

public long write(List<Journal.Entry> entries)

Specified by:

write in interface Journal

write

public long write(byte[] idBytes,
                  byte[] messageBytes)

Specified by:

write in interface Journal

read

public List<Journal.JournalReadEntry> read(long maximumCount)

Specified by:

read in interface Journal

markJournalOffsetCommitted

public void markJournalOffsetCommitted(long offset)

Specified by:

markJournalOffsetCommitted in interface Journal

startUp

protected void startUp()
                throws Exception

Specified by:

startUp in class com.google.common.util.concurrent.AbstractIdleService

Throws:

Exception

shutDown

protected void shutDown()
                 throws Exception

Specified by:

shutDown in class com.google.common.util.concurrent.AbstractIdleService

Throws:

Exception