/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package com.espertech.esper.pattern;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.hook.ConditionPatternSubexpressionMax;
import com.espertech.esper.pattern.pool.PatternSubexpressionPoolStmtSvc;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* This class represents the state of a followed-by operator in the evaluation state tree, with a maximum number of instances provided, and
* with the additional capability to engine-wide report on pattern instances.
*/
public class EvalFollowedByWithMaxStateNodeManaged extends EvalStateNode implements Evaluator
{
protected final EvalFollowedByNode evalFollowedByNode;
protected final HashMap<EvalStateNode, Integer> nodes;
protected final int[] countActivePerChild;
/**
* Constructor.
* @param parentNode is the parent evaluator to call to indicate truth value
* @param evalFollowedByNode is the factory node associated to the state
*/
public EvalFollowedByWithMaxStateNodeManaged(Evaluator parentNode,
EvalFollowedByNode evalFollowedByNode)
{
super(parentNode);
this.evalFollowedByNode = evalFollowedByNode;
this.nodes = new HashMap<EvalStateNode, Integer>();
if (evalFollowedByNode.isTrackWithMax()) {
this.countActivePerChild = new int[evalFollowedByNode.getChildNodes().length - 1];
}
else {
this.countActivePerChild = null;
}
}
public void removeMatch(Set<EventBean> matchEvent) {
PatternConsumptionUtil.childNodeRemoveMatches(matchEvent, nodes.keySet());
}
@Override
public EvalNode getFactoryNode() {
return evalFollowedByNode;
}
public final void start(MatchedEventMap beginState)
{
EvalNode child = evalFollowedByNode.getChildNodes()[0];
EvalStateNode childState = child.newState(this, null, 0L);
nodes.put(childState, 0);
childState.start(beginState);
}
public final void evaluateTrue(MatchedEventMap matchEvent, EvalStateNode fromNode, boolean isQuitted)
{
Integer index = nodes.get(fromNode);
if (isQuitted)
{
nodes.remove(fromNode);
if (index != null && index > 0) {
if (evalFollowedByNode.isTrackWithMax()) {
countActivePerChild[index - 1]--;
}
if (evalFollowedByNode.isTrackWithPool()) {
PatternSubexpressionPoolStmtSvc poolSvc = evalFollowedByNode.getContext().getStatementContext().getPatternSubexpressionPoolSvc();
poolSvc.getEngineSvc().decreaseCount(evalFollowedByNode);
poolSvc.getStmtHandler().decreaseCount();
}
}
}
// the node may already have quit as a result of an outer state quitting this state,
// however the callback may still be received; It is fine to ignore this callback.
if (index == null)
{
return;
}
// If the match came from the very last filter, need to escalate
int numChildNodes = evalFollowedByNode.getChildNodes().length;
if (index == (numChildNodes - 1))
{
boolean isFollowedByQuitted = false;
if (nodes.isEmpty())
{
isFollowedByQuitted = true;
}
this.getParentEvaluator().evaluateTrue(matchEvent, this, isFollowedByQuitted);
}
// Else start a new sub-expression for the next-in-line filter
else
{
if (evalFollowedByNode.isTrackWithMax()) {
int max = evalFollowedByNode.getFactoryNode().getMax(index);
if ((max != -1) && (max >=0)) {
if (countActivePerChild[index] >= max) {
evalFollowedByNode.getContext().getAgentInstanceContext().getStatementContext().getExceptionHandlingService().handleCondition(new ConditionPatternSubexpressionMax(max), evalFollowedByNode.getContext().getAgentInstanceContext().getStatementContext().getEpStatementHandle());
return;
}
}
}
if (evalFollowedByNode.isTrackWithPool()) {
PatternSubexpressionPoolStmtSvc poolSvc = evalFollowedByNode.getContext().getStatementContext().getPatternSubexpressionPoolSvc();
boolean allow = poolSvc.getEngineSvc().tryIncreaseCount(evalFollowedByNode);
if (!allow) {
return;
}
poolSvc.getStmtHandler().increaseCount();
}
if (evalFollowedByNode.isTrackWithMax()) {
countActivePerChild[index]++;
}
EvalNode child = evalFollowedByNode.getChildNodes()[index + 1];
EvalStateNode childState = child.newState(this, null, 0L);
nodes.put(childState, index + 1);
childState.start(matchEvent);
}
}
public final void evaluateFalse(EvalStateNode fromNode)
{
fromNode.quit();
Integer index = nodes.remove(fromNode);
if (index != null && index > 0) {
if (evalFollowedByNode.isTrackWithMax()) {
countActivePerChild[index - 1]--;
}
if (evalFollowedByNode.isTrackWithPool()) {
PatternSubexpressionPoolStmtSvc poolSvc = evalFollowedByNode.getContext().getStatementContext().getPatternSubexpressionPoolSvc();
poolSvc.getEngineSvc().decreaseCount(evalFollowedByNode);
poolSvc.getStmtHandler().decreaseCount();
}
}
if (nodes.isEmpty())
{
this.getParentEvaluator().evaluateFalse(this);
quit();
}
}
public boolean isNotOperator() {
return false;
}
public boolean isFilterStateNode() {
return false;
}
public boolean isFilterChildNonQuitting() {
return false;
}
public final void quit()
{
for (Map.Entry<EvalStateNode, Integer> entry : nodes.entrySet())
{
entry.getKey().quit();
if (evalFollowedByNode.isTrackWithPool()) {
if (entry.getValue() > 0) {
PatternSubexpressionPoolStmtSvc poolSvc = evalFollowedByNode.getContext().getStatementContext().getPatternSubexpressionPoolSvc();
poolSvc.getEngineSvc().decreaseCount(evalFollowedByNode);
poolSvc.getStmtHandler().decreaseCount();
}
}
}
}
public final void accept(EvalStateNodeVisitor visitor)
{
visitor.visitFollowedBy(evalFollowedByNode.getFactoryNode(), this, nodes, countActivePerChild);
for (EvalStateNode node : nodes.keySet()) {
node.accept(visitor);
}
}
public final String toString()
{
return "EvalFollowedByStateNode nodes=" + nodes.size();
}
private static final Log log = LogFactory.getLog(EvalFollowedByWithMaxStateNodeManaged.class);
}