/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* 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.filter;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.epl.expression.core.ExprNode;
import com.espertech.esper.epl.variable.VariableService;
public class ExprNodeAdapterMultiStreamStmtLock extends ExprNodeAdapterMultiStream {
public static final long LOCK_BACKOFF_MSEC = 10;
public ExprNodeAdapterMultiStreamStmtLock(int filterSpecId, int filterSpecParamPathNum, ExprNode exprNode, ExprEvaluatorContext evaluatorContext, VariableService variableService, EventBean[] prototype) {
super(filterSpecId, filterSpecParamPathNum, exprNode, evaluatorContext, variableService, prototype);
}
@Override
protected boolean evaluatePerStream(EventBean[] eventsPerStream) {
boolean obtained = evaluatorContext.getAgentInstanceLock().acquireWriteLock(LOCK_BACKOFF_MSEC);
if (!obtained) {
throw new FilterLockBackoffException();
}
try {
return super.evaluatePerStream(eventsPerStream);
} finally {
evaluatorContext.getAgentInstanceLock().releaseWriteLock();
}
}
}