/*
***************************************************************************************
* 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.core.service;
import java.io.Serializable;
/**
* Records minimal statement filter version required for processing.
*/
public class StatementAgentInstanceFilterVersion implements Serializable {
private static final long serialVersionUID = 5443667960162916787L;
private volatile long stmtFilterVersion;
/**
* Ctor.
*/
public StatementAgentInstanceFilterVersion() {
stmtFilterVersion = Long.MIN_VALUE;
}
/**
* Set filter version.
*
* @param stmtFilterVersion to set
*/
public void setStmtFilterVersion(long stmtFilterVersion) {
this.stmtFilterVersion = stmtFilterVersion;
}
public long getStmtFilterVersion() {
return stmtFilterVersion;
}
/**
* Check current filter.
*
* @param filterVersion to check
* @return false if not current
*/
public boolean isCurrentFilter(long filterVersion) {
if (filterVersion < stmtFilterVersion) {
// catch-up in case of roll
if (filterVersion + 100000 < stmtFilterVersion && stmtFilterVersion != Long.MAX_VALUE) {
stmtFilterVersion = filterVersion;
}
return false;
}
return true;
}
}