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package org.glassfish.jersey.perftest.agent;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.lang.instrument.Instrumentation;
import java.security.ProtectionDomain;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtField;
import javassist.CtMethod;
/**
* Java agent that instruments any Jersey 2 ApplicationHandler found with a new
* Metrics timer. If parameter is given, it will be understood as another class.method
* (delimited by a single dot) that has to be instrumented instead of the Jersey handler.
*
* This one has been tested with Grizzly 2, Catalina and WLS.
*
* @author Jakub Podlesak (jakub.podlesak at oracle.com)
*/
public class PerfTestAgent {
private static final String HANDLER_CLASS_NAME = "org.glassfish.jersey.server.ApplicationHandler";
private static final String HANDLER_METHOD_NAME = "handle";
public static void premain(String agentArgs, Instrumentation instrumentation) {
final String handlerClassName = (agentArgs != null && !agentArgs.isEmpty()) ? agentArgs.substring(0, agentArgs.lastIndexOf('.')) : HANDLER_CLASS_NAME;
final String handlerMethodName = (agentArgs != null && !agentArgs.isEmpty()) ? agentArgs.substring(agentArgs.lastIndexOf('.') + 1) : HANDLER_METHOD_NAME;
instrumentation.addTransformer(new ClassFileTransformer() {
@Override
public byte[] transform(ClassLoader loader, String className, Class<?> aClass, ProtectionDomain protectionDomain, byte[] bytes) throws IllegalClassFormatException {
if (handlerClassName.replaceAll("\\.", "/").equals(className)) {
try {
ClassPool cp = ClassPool.getDefault();
cp.appendSystemPath();
CtClass cc = cp.makeClass(new java.io.ByteArrayInputStream(bytes));
final CtField ctxField = CtField.make("public static final agent.metrics.Timer.Context agentTimerCtx;", cc);
final CtField registryField = CtField.make("public static final agent.metrics.MetricRegistry agentREG = new agent.metrics.MetricRegistry();", cc);
final CtField reporterField = CtField.make("public static final agent.metrics.JmxReporter agentReporter = agent.metrics.JmxReporter.forRegistry(agentREG).build();", cc);
final CtField timerField = CtField.make("public static final agent.metrics.Timer agentTimer = "
+ "agentREG.timer(agent.metrics.MetricRegistry.name(\"" + handlerClassName + "\", new String[] {\"" + handlerMethodName + "\"}));", cc);
cc.addField(registryField);
cc.addField(reporterField);
cc.addField(timerField);
cc.makeClassInitializer().insertAfter("agentReporter.start();");
CtMethod m = cc.getDeclaredMethod(handlerMethodName);
m.addLocalVariable("agentCtx", ctxField.getType());
m.insertBefore("agentCtx = agentTimer.time();");
m.insertAfter("agentCtx.stop();", true);
byte[] byteCode = cc.toBytecode();
cc.detach();
System.out.printf("Jersey Perf Agent Instrumentation Done! (instrumented method: %s)\n", m.getLongName());
return byteCode;
} catch (Exception ex) {
ex.printStackTrace();
}
}
return null;
}
});
}
}