/*
* *************************************************************************************
* 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.client.annotation.Audit;
import com.espertech.esper.client.annotation.AuditEnum;
import com.espertech.esper.event.EventBeanUtility;
import com.espertech.esper.filter.FilterSpecCompiled;
import com.espertech.esper.filter.FilterSpecParam;
import com.espertech.esper.util.AuditPath;
import com.espertech.esper.util.JavaClassHelper;
import com.espertech.esper.view.EventStream;
import java.io.StringWriter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
public class EventStreamProxy implements java.lang.reflect.InvocationHandler {
private final String engineURI;
private final String statementName;
private final String eventTypeAndFilter;
private final EventStream eventStream;
public static EventStream getAuditProxy(String engineURI, String statementName, Annotation[] annotations, FilterSpecCompiled filterSpec, EventStream designated) {
Audit audit = AuditEnum.STREAM.getAudit(annotations);
if (audit == null) {
return designated;
}
StringWriter filterAndParams = new StringWriter();
filterAndParams.write(filterSpec.getFilterForEventType().getName());
if (filterSpec.getParameters() != null && filterSpec.getParameters().length > 0) {
filterAndParams.write('(');
String delimiter = "";
for (FilterSpecParam param : filterSpec.getParameters()) {
filterAndParams.write(delimiter);
filterAndParams.write(param.getLookupable().getExpression());
filterAndParams.write(param.getFilterOperator().getTextualOp());
filterAndParams.write("...");
delimiter = ",";
}
filterAndParams.write(')');
}
return (EventStream) EventStreamProxy.newInstance(engineURI, statementName, filterAndParams.toString(), designated);
}
public static Object newInstance(String engineURI, String statementName, String eventTypeAndFilter, EventStream eventStream) {
return java.lang.reflect.Proxy.newProxyInstance(
eventStream.getClass().getClassLoader(),
JavaClassHelper.getSuperInterfaces(eventStream.getClass()),
new EventStreamProxy(engineURI, statementName, eventTypeAndFilter, eventStream));
}
public EventStreamProxy(String engineURI, String statementName, String eventTypeAndFilter, EventStream eventStream) {
this.engineURI = engineURI;
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 (AuditPath.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);
}
AuditPath.auditLog(engineURI, statementName, AuditEnum.STREAM, eventTypeAndFilter + " inserted " + events);
}
}
return m.invoke(eventStream, args);
}
}