Package io.wcm.dam.assetservice.impl.dataversion

Class ChecksumDataVersionStrategy

java.lang.Object

io.wcm.dam.assetservice.impl.dataversion.DataVersionStrategy

io.wcm.dam.assetservice.impl.dataversion.ChecksumDataVersionStrategy

public class ChecksumDataVersionStrategy
extends DataVersionStrategy

Strategy that generates a checksum bases on all DAM asset's path and last modified dates within the DAM asset folder. The aggregated checksum is built by executing a JCR query using the AEM-predefined OAK index damAssetLucene. Executing the query does not touch the JCR content at all, it only reads JCR path and sha-1 string from the lucene index. This query is executed max. once during the "update interval", and only if DAM events occurred since the last checksum generation.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	STRATEGY	Data version strategy id for configuration persistence.

Fields inherited from class io.wcm.dam.assetservice.impl.dataversion.DataVersionStrategy

damPath, log

Constructor Summary

Constructors

Constructor	Description
ChecksumDataVersionStrategy(String damPath, int dataVersionUpdateIntervalSec, org.apache.sling.api.resource.ResourceResolverFactory resourceResolverFactory, ScheduledExecutorService executor)

Method Summary

Modifier and Type	Method	Description
String	getDataVersion()	Returns data version for this DAM root path
void	handleDamEvent(com.day.cq.dam.api.DamEvent damEvent)	Is called when a DAM event affecting any asset within the DAM path occurs.

Methods inherited from class io.wcm.dam.assetservice.impl.dataversion.DataVersionStrategy

matches

Methods inherited from class java.lang.Object

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

Field Details

STRATEGY

public static final String STRATEGY

Data version strategy id for configuration persistence.

See Also:

• Constant Field Values

Constructor Details

ChecksumDataVersionStrategy

public ChecksumDataVersionStrategy(String damPath,
 int dataVersionUpdateIntervalSec,
 org.apache.sling.api.resource.ResourceResolverFactory resourceResolverFactory,
 ScheduledExecutorService executor)

Parameters:

damPath - DAM root path

dataVersionUpdateIntervalSec - Data version update interval

resourceResolverFactory - Resource resolver factory

executor - Shared executor service instance

Method Details

handleDamEvent

public void handleDamEvent(com.day.cq.dam.api.DamEvent damEvent)

Description copied from class: DataVersionStrategy

Is called when a DAM event affecting any asset within the DAM path occurs.

Specified by:

handleDamEvent in class DataVersionStrategy

Parameters:

damEvent - DAM event

getDataVersion

public String getDataVersion()

Description copied from class: DataVersionStrategy

Returns data version for this DAM root path

Specified by:

getDataVersion in class DataVersionStrategy

Returns:

Data version. Never null.