com.atlassian.confluence.impl.journal

Class DefaultJournalManager

java.lang.Object

com.atlassian.confluence.impl.journal.DefaultJournalManager

All Implemented Interfaces:

JournalManager, JournalManagerBackdoor

public class DefaultJournalManager
extends Object
implements JournalManager, JournalManagerBackdoor

This is the default implementation of JournalManager.

Since:

5.6

Constructor Summary

Constructors

Constructor and Description
DefaultJournalManager(JournalDao journalDao, JournalStateStore journalStateStore, long ignoreWithinMillis)

Method Summary

Methods

Modifier and Type	Method and Description
int	countEntries(JournalIdentifier journalId) Counts the number of entries in a journal.
long	enqueue(JournalEntry entry) Adds the given entry to a journal.
long	getIgnoreWithinMillis()
Iterable<JournalEntry>	peek(JournalIdentifier journalId, int maxEntries) Return a copy of journal entries that are waiting to be processed.
<V> V	processEntries(JournalIdentifier journalId, int maxEntries, com.google.common.base.Function<Iterable<JournalEntry>,EntryProcessorResult<V>> entryProcessor) Processes journal entries that were added since the last time this method was called for this journal on this cluster node.
void	reset(JournalIdentifier journalId) Resets the state of the journal so that all entries currently in the journal will be skipped.
void	setIgnoreWithinMillis(long ignoreWithinMillis)
void	waitForRecentEntriesToBecomeVisible() Waits long enough to ensure that entries added before calling this method will be available to subsequent call to JournalManager.processEntries(JournalIdentifier, int, com.google.common.base.Function).

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultJournalManager

public DefaultJournalManager(JournalDao journalDao,
                     JournalStateStore journalStateStore,
                     long ignoreWithinMillis)

Parameters:

ignoreWithinMillis - entries added within the last given milliseconds are ignored

Method Detail

enqueue

public long enqueue(@Nonnull
           JournalEntry entry)

Description copied from interface: JournalManager

Adds the given entry to a journal.

New journal is automatically created if a journal with the given name does not exists.

Specified by:

enqueue in interface JournalManager

Parameters:

entry - entry to persist

Returns:

id generated for the entry

peek

public Iterable<JournalEntry> peek(@Nonnull
                          JournalIdentifier journalId,
                          int maxEntries)

Description copied from interface: JournalManager

Return a copy of journal entries that are waiting to be processed.

Specified by:

peek in interface JournalManager

Parameters:

journalId - only entries with this journal id will be returned

maxEntries - maximum number of entries to return

Returns:

a copy of journal entries that are waiting to be processed

reset

public void reset(@Nonnull
         JournalIdentifier journalId)

Description copied from interface: JournalManager

Resets the state of the journal so that all entries currently in the journal will be skipped.

Specified by:

reset in interface JournalManager

Parameters:

journalId - identifier of the journal to reset

countEntries

public int countEntries(@Nonnull
               JournalIdentifier journalId)

Description copied from interface: JournalManager

Counts the number of entries in a journal.

Specified by:

countEntries in interface JournalManager

Parameters:

journalId - identifier of the journal

processEntries

public <V> V processEntries(@Nonnull
                   JournalIdentifier journalId,
                   int maxEntries,
                   @Nonnull
                   com.google.common.base.Function<Iterable<JournalEntry>,EntryProcessorResult<V>> entryProcessor)
                 throws org.springframework.dao.DataAccessException

Description copied from interface: JournalManager

Processes journal entries that were added since the last time this method was called for this journal on this cluster node.

This method does not return entries that were added immediately before calling this method. Use JournalManager.waitForRecentEntriesToBecomeVisible() for ensuring these entries will be included.

This method can miss some entries due to identifier assignment and entry insertion not being an atomic operation. The risk of missed entries can be reduced by creating new entries as close to transaction commit as possible.

If entryProcessor throws an exception, the same entries will be returned again when this method is next called for this journal on this cluster node.

New journal is automatically created if a journal with the given name does not exists.

Specified by:

processEntries in interface JournalManager

Parameters:

journalId - only entries with this journal id will be returned

maxEntries - maximum number of entries to process

entryProcessor - function that will process entries that were added since the last time

Returns:

result of entryProcessor

Throws:

org.springframework.dao.DataAccessException - if entries could not be fetched or the journal state could not be saved

waitForRecentEntriesToBecomeVisible

public void waitForRecentEntriesToBecomeVisible()
                                         throws InterruptedException

Description copied from interface: JournalManager

Waits long enough to ensure that entries added before calling this method will be available to subsequent call to JournalManager.processEntries(JournalIdentifier, int, com.google.common.base.Function).

Specified by:

waitForRecentEntriesToBecomeVisible in interface JournalManager

Throws:

InterruptedException - if the thread got interrupted

getIgnoreWithinMillis

public long getIgnoreWithinMillis()

Specified by:

getIgnoreWithinMillis in interface JournalManagerBackdoor

setIgnoreWithinMillis

public void setIgnoreWithinMillis(long ignoreWithinMillis)

Specified by:

setIgnoreWithinMillis in interface JournalManagerBackdoor