com.espertech.esper.view.stream.EventStreamProxy.java Source code

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Here is the source code for com.espertech.esper.view.stream.EventStreamProxy.java

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/*
 * *************************************************************************************
 *  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.view.stream;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.epl.expression.ExprEvaluator;
import com.espertech.esper.event.EventBeanUtility;
import com.espertech.esper.util.AuditPath;
import com.espertech.esper.util.JavaClassHelper;
import com.espertech.esper.view.EventStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.lang.reflect.Method;

public class EventStreamProxy implements java.lang.reflect.InvocationHandler {

    private static final Log auditLog = LogFactory.getLog(AuditPath.AUDIT_LOG);

    private final String statementName;
    private final String eventTypeAndFilter;
    private final EventStream eventStream;

    public static Object newInstance(String statementName, String eventTypeAndFilter, EventStream eventStream) {
        return java.lang.reflect.Proxy.newProxyInstance(eventStream.getClass().getClassLoader(),
                JavaClassHelper.getSuperInterfaces(eventStream.getClass()),
                new EventStreamProxy(statementName, eventTypeAndFilter, eventStream));
    }

    public EventStreamProxy(String statementName, String eventTypeAndFilter, EventStream eventStream) {
        this.statementName = statementName;
        this.eventTypeAndFilter = eventTypeAndFilter;
        this.eventStream = eventStream;
    }

    public Object invoke(Object proxy, Method m, Object[] args) throws Throwable {

        if (m.getName().equals("insert")) {
            if (auditLog.isInfoEnabled()) {
                Object arg = args[0];
                String events = "(undefined)";
                if (arg instanceof EventBean[]) {
                    events = EventBeanUtility.summarize((EventBean[]) arg);
                } else if (arg instanceof EventBean) {
                    events = EventBeanUtility.summarize((EventBean) arg);
                }
                auditLog.info(
                        "Statement " + statementName + " stream " + eventTypeAndFilter + " inserted " + events);
            }
        }

        return m.invoke(eventStream, args);
    }
}