org.alfresco.repo.thumbnail.conditions

Class NodeEligibleForRethumbnailingEvaluator

java.lang.Object

org.alfresco.repo.action.CommonResourceAbstractBase

org.alfresco.repo.action.ParameterizedItemAbstractBase

org.alfresco.repo.action.evaluator.ActionConditionEvaluatorAbstractBase

org.alfresco.repo.thumbnail.conditions.NodeEligibleForRethumbnailingEvaluator

All Implemented Interfaces:

ActionConditionEvaluator, org.springframework.beans.factory.BeanNameAware

public class NodeEligibleForRethumbnailingEvaluator
extends ActionConditionEvaluatorAbstractBase

This action evaluator is specifically created for the Thumbnail Service. It is used to evaluate whether a ThumbnailDefinition should be executed - based on previous failed thumbnail attempts for that definition on that source node, as well as some configuration data.

The behaviour is as follows:

• All content nodes are eligible for thumbnailing initially. Of course thumbnails can only ever be attempted for those content mime types that have at least one registered and active ContentTransformer.
• If the first attempt to produce a thumbnail for a node fails, then it may be retried up to a maximum of system.thumbnail.retryCount times.
• These initial retries to produce a thumbnail will occur not more often than every system.thumbnail.retryPeriod seconds and will use which ever content transformers the content service gives.
• If a thumbnail is not successfully produced for a node after these attempts then it is considered to be a 'difficult' piece of content with respect to thumbnailing and the assumption is that a thumbnail may never be available for it. However, in order to allow for the possibility of software upgrades or similiar, which may make the content thumbnailable at a later date, further attempts will be made, but at a much reduced frequency.
• Difficult pieces of content will not be attempted more often than every system.thumbnail.quietPeriod seconds.
• The attempts to thumbnail difficult pieces of content can be disabled by setting system.thumbnail.quietPeriodRetriesEnabled to false.

At all times, thumbnails will be attempted when a user navigates to a page which needs to show the relevant thumbnail (lazy production).

Since:

3.5.0

Author:

Neil Mc Erlean.

Field Summary

Fields

Modifier and Type	Field and Description
static String	NAME Evaluator constants
protected org.alfresco.service.cmr.repository.NodeService	nodeService
static String	PARAM_QUIET_PERIOD
static String	PARAM_QUIET_PERIOD_RETRIES_ENABLED
static String	PARAM_RETRY_COUNT
static String	PARAM_RETRY_PERIOD
static String	PARAM_THUMBNAIL_DEFINITION_NAME
protected ThumbnailService	thumbnailService

Fields inherited from class org.alfresco.repo.action.evaluator.ActionConditionEvaluatorAbstractBase

actionConditionDefinition

Fields inherited from class org.alfresco.repo.action.ParameterizedItemAbstractBase

adhocPropertiesAllowed, DISPLAY_LABEL, runtimeActionService

Fields inherited from class org.alfresco.repo.action.CommonResourceAbstractBase

name

Constructor Summary

Constructors

Constructor and Description
NodeEligibleForRethumbnailingEvaluator()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	addParameterDefinitions(List<ParameterDefinition> paramList) Add parameter definitions
boolean	evaluateImpl(ActionCondition actionCondition, org.alfresco.service.cmr.repository.NodeRef actionedUponNodeRef) Evaluation implementation
void	setNodeService(org.alfresco.service.cmr.repository.NodeService nodeService)
void	setThumbnailService(ThumbnailService thumbnailService)

Methods inherited from class org.alfresco.repo.action.evaluator.ActionConditionEvaluatorAbstractBase

evaluate, getActionConditionDefintion, init, setPublicCondition

Methods inherited from class org.alfresco.repo.action.ParameterizedItemAbstractBase

checkMandatoryProperties, getAdhocPropertiesAllowed, getDescriptionKey, getParamDisplayLabel, getParameterDefintions, getTitleKey, setAdhocPropertiesAllowed, setRuntimeActionService, toString

Methods inherited from class org.alfresco.repo.action.CommonResourceAbstractBase

setBeanName

Methods inherited from class java.lang.Object

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

Field Detail

NAME

public static final String NAME

Evaluator constants

See Also:

Constant Field Values

PARAM_THUMBNAIL_DEFINITION_NAME

public static final String PARAM_THUMBNAIL_DEFINITION_NAME

See Also:

Constant Field Values

PARAM_RETRY_PERIOD

public static final String PARAM_RETRY_PERIOD

See Also:

Constant Field Values

PARAM_RETRY_COUNT

public static final String PARAM_RETRY_COUNT

See Also:

Constant Field Values

PARAM_QUIET_PERIOD

public static final String PARAM_QUIET_PERIOD

See Also:

Constant Field Values

PARAM_QUIET_PERIOD_RETRIES_ENABLED

public static final String PARAM_QUIET_PERIOD_RETRIES_ENABLED

See Also:

Constant Field Values

nodeService

protected org.alfresco.service.cmr.repository.NodeService nodeService

thumbnailService

protected ThumbnailService thumbnailService

Constructor Detail

NodeEligibleForRethumbnailingEvaluator

public NodeEligibleForRethumbnailingEvaluator()

Method Detail

setNodeService

public void setNodeService(org.alfresco.service.cmr.repository.NodeService nodeService)

setThumbnailService

public void setThumbnailService(ThumbnailService thumbnailService)

addParameterDefinitions

protected void addParameterDefinitions(List<ParameterDefinition> paramList)

Add parameter definitions

Specified by:

addParameterDefinitions in class ParameterizedItemAbstractBase

Parameters:

paramList - the parameter definitions list

evaluateImpl

public boolean evaluateImpl(ActionCondition actionCondition,
                   org.alfresco.service.cmr.repository.NodeRef actionedUponNodeRef)

Description copied from class: ActionConditionEvaluatorAbstractBase

Evaluation implementation

Specified by:

evaluateImpl in class ActionConditionEvaluatorAbstractBase

Parameters:

actionCondition - the action condition

actionedUponNodeRef - the actioned upon node reference

Returns:

the result of the condition evaluation

See Also:

ActionConditionEvaluatorAbstractBase.evaluateImpl(ActionCondition, NodeRef)