org.mmbase.cache
Class ConstraintsMatchingStrategy

java.lang.Object
  org.mmbase.cache.ReleaseStrategy
      org.mmbase.cache.ConstraintsMatchingStrategy

public class ConstraintsMatchingStrategy
extends ReleaseStrategy

This strategy will evaluate the constraint on a a query object against a NodeEvent. It will apply the following rules:
new node/delete node

• If the step of a constraint matches the type of the event, and the values of the node don't fall within the constraint: don't flush.
• If the step of a constraint matches the type of the event, and the values of the node don't fall within the constraint: flush.
• If no constraints have a step matching the type of the event: flush.

change node Like the above, but an extra check has to be made:

• if the node previously fell within the constraints but now doesn't: flush
• if the node previously didn't fall within the constraints but now does: flush

Since:

MMBase-1.8

Version:

$Id: ConstraintsMatchingStrategy.java 36364 2009-06-24 17:55:56Z michiel $

Author:

Ernst Bunders

Nested Class Summary

protected static class

ConstraintsMatchingStrategy.AbstractConstraintMatcher

Nested classes/interfaces inherited from class org.mmbase.cache.ReleaseStrategy

ReleaseStrategy.StrategyResult, ReleaseStrategy.Timer

Constructor Summary

ConstraintsMatchingStrategy()

Method Summary

protected boolean	doEvaluate(NodeEvent event, SearchQuery query, List<MMObjectNode> cachedResult) implement this method to create your own strategy.
protected boolean	doEvaluate(RelationEvent event, SearchQuery query, List<MMObjectNode> cachedResult) implement this method to create your own strategy.
protected static ConstraintsMatchingStrategy.AbstractConstraintMatcher	findMatcherForConstraint(Constraint constraint) This method will find a constraint matcher that supports the given constraint, and will return the UnsupportedConstraintMatcher if none is found.
String	getDescription()
String	getName()

Methods inherited from class org.mmbase.cache.ReleaseStrategy

clear, equals, evaluate, evaluate, getAvgEvaluationTimeInMilis, getConstraintsForField, getSortordersForField, getTotalEvaluated, getTotalEvaluationTimeMillis, getTotalPreserved, hashCode, isEnabled, setEnabled, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ConstraintsMatchingStrategy

public ConstraintsMatchingStrategy()

Method Detail

getName

public String getName()

Specified by:

getName in class ReleaseStrategy

getDescription

public String getDescription()

Specified by:

getDescription in class ReleaseStrategy

doEvaluate

protected final boolean doEvaluate(NodeEvent event,
                                   SearchQuery query,
                                   List<MMObjectNode> cachedResult)

Description copied from class: ReleaseStrategy

implement this method to create your own strategy.

Specified by:

doEvaluate in class ReleaseStrategy

Parameters:

event - a node event

Returns:

true if the cache entry should be released

doEvaluate

protected final boolean doEvaluate(RelationEvent event,
                                   SearchQuery query,
                                   List<MMObjectNode> cachedResult)

Description copied from class: ReleaseStrategy

implement this method to create your own strategy.

Specified by:

doEvaluate in class ReleaseStrategy

Parameters:

event - a relation event

Returns:

true if the cache entry should be released

findMatcherForConstraint

protected static final ConstraintsMatchingStrategy.AbstractConstraintMatcher findMatcherForConstraint(Constraint constraint)
                                                                                               throws InvocationTargetException,
                                                                                                      NoSuchMethodException,
                                                                                                      InstantiationException,
                                                                                                      IllegalAccessException

This method will find a constraint matcher that supports the given constraint, and will return the UnsupportedConstraintMatcher if none is found.

Parameters:

constraint -

Throws:

InvocationTargetException

NoSuchMethodException

InstantiationException

IllegalAccessException