org.apache.sling.discovery.commons.providers.spi.base

Class OakBacklogClusterSyncService

java.lang.Object

org.apache.sling.discovery.commons.providers.spi.base.AbstractServiceWithBackgroundCheck

org.apache.sling.discovery.commons.providers.spi.base.OakBacklogClusterSyncService

All Implemented Interfaces:

ClusterSyncService

public class OakBacklogClusterSyncService
extends AbstractServiceWithBackgroundCheck
implements ClusterSyncService

The OakBacklogClusterSyncService will wait until all instances in the local cluster are no longer in any backlog state.

Field Summary

Fields

Modifier and Type	Field and Description
protected DiscoveryLiteConfig	commonsConfig
protected ResourceResolverFactory	resourceResolverFactory
protected SlingSettingsService	settingsService

Fields inherited from class org.apache.sling.discovery.commons.providers.spi.base.AbstractServiceWithBackgroundCheck

backgroundCheckRunnable, logger, slingId

Constructor Summary

Constructors

Constructor and Description
OakBacklogClusterSyncService()

Method Summary

Modifier and Type	Method and Description
protected void	activate()
void	cancelSync()
protected DiscoveryLiteConfig	getCommonsConfig()
ClusterSyncHistory	getConsistencyHistory()
protected ResourceResolver	getResourceResolver() Get or create a ResourceResolver
protected SlingSettingsService	getSettingsService()
List<String>	getSyncHistory()
void	setConsistencyHistory(ClusterSyncHistory consistencyHistory)
void	sync(BaseTopologyView view, Runnable callback) Starts the synchronization process and calls the provided callback upon completion.
static OakBacklogClusterSyncService	testConstructor(DiscoveryLiteConfig commonsConfig, IdMapService idMapService, SlingSettingsService settingsService, ResourceResolverFactory resourceResolverFactory) for testing only!
static OakBacklogClusterSyncService	testConstructorAndActivate(DiscoveryLiteConfig commonsConfig, IdMapService idMapService, SlingSettingsService settingsService, ResourceResolverFactory resourceResolverFactory)

Methods inherited from class org.apache.sling.discovery.commons.providers.spi.base.AbstractServiceWithBackgroundCheck

cancelPreviousBackgroundCheck, startBackgroundCheck, triggerBackgroundCheck

Methods inherited from class java.lang.Object

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

Field Detail

commonsConfig

protected DiscoveryLiteConfig commonsConfig

resourceResolverFactory

protected ResourceResolverFactory resourceResolverFactory

settingsService

protected SlingSettingsService settingsService

Constructor Detail

OakBacklogClusterSyncService

public OakBacklogClusterSyncService()

Method Detail

testConstructorAndActivate

public static OakBacklogClusterSyncService testConstructorAndActivate(DiscoveryLiteConfig commonsConfig,
                                                                      IdMapService idMapService,
                                                                      SlingSettingsService settingsService,
                                                                      ResourceResolverFactory resourceResolverFactory)

testConstructor

public static OakBacklogClusterSyncService testConstructor(DiscoveryLiteConfig commonsConfig,
                                                           IdMapService idMapService,
                                                           SlingSettingsService settingsService,
                                                           ResourceResolverFactory resourceResolverFactory)

for testing only!

activate

protected void activate()

setConsistencyHistory

public void setConsistencyHistory(ClusterSyncHistory consistencyHistory)

getConsistencyHistory

public ClusterSyncHistory getConsistencyHistory()

getResourceResolver

protected ResourceResolver getResourceResolver()
                                        throws LoginException

Get or create a ResourceResolver

Throws:

LoginException

cancelSync

public void cancelSync()

Specified by:

cancelSync in interface ClusterSyncService

sync

public void sync(BaseTopologyView view,
                 Runnable callback)

Description copied from interface: ClusterSyncService

Starts the synchronization process and calls the provided callback upon completion.

sync() is not thread-safe and should not be invoked concurrently.

If sync() gets called before a previous invocation finished, that previous invocation will be discarded, ie the callback of the previous invocation will no longer be called.

The synchronization process consists of making sure that the repository has processed any potential backlog of instances that are no longer part of the provided, new view. Plus it writes a 'sync-token' to a well-defined location, with all peers doing the same, and upon seeing all other sync-tokens declares successful completion - at which point it calls the callback.run().

Specified by:

sync in interface ClusterSyncService

Parameters:

view - the view which all instances in the local cluster should agree on having seen

callback - the runnable which should be called after successful syncing

getCommonsConfig

protected DiscoveryLiteConfig getCommonsConfig()

getSettingsService

protected SlingSettingsService getSettingsService()

getSyncHistory

public List<String> getSyncHistory()