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annotate src/org/dancres/blitz/remote/debug/TimingInvocationHandler.java @ 22:b7e52953b7a6

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Add some cache/memory statistics to help spot potential exhaustion and other tuning issues.
author Dan Creswell <dan.creswell@gmail.com>
date Fri, 28 Aug 2009 17:23:33 +0100
parents 3dc0c5604566
children
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1 package org.dancres.blitz.remote.debug;
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2
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3 import java.lang.reflect.Method;
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4
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5 import net.jini.jeri.BasicInvocationHandler;
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6 import net.jini.jeri.ObjectEndpoint;
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8 import net.jini.core.constraint.MethodConstraints;
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9
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10 /**
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11 <p><code>TimingInvocationHandler</code>, dispatches all remote
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12 invocations as normal whilst reporting the time taken to execute the call.
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13 This can be used to locate "bottlenecks" in remote service configurations.
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14 </p>
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16 <p>NOTE: Using this handler in combination with clients which stipulate
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17 verification when preparing proxies is doomed to failure because there
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18 isn't currently a suitable <code>TrustVerifier</code>. You could, of
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19 course, adopt the brute force approach of putting this code in all
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20 client classpaths.....</p>
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22 @todo Code up TrustVerifier for this InvocationHandler
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23 */
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24 public class TimingInvocationHandler extends BasicInvocationHandler {
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25 public TimingInvocationHandler(ObjectEndpoint anEndpoint,
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26 MethodConstraints aServerConstraints) {
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27 super(anEndpoint, aServerConstraints);
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28 }
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30 public TimingInvocationHandler(BasicInvocationHandler aHandler,
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31 MethodConstraints aClientConstraints) {
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32 super(aHandler, aClientConstraints);
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33 }
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34
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35 public Object invoke(Object aProxy, Method aMethod, Object[] anArgs)
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36 throws Throwable {
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37 long myStart = System.currentTimeMillis();
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38
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39 Object myResult = super.invoke(aProxy, aMethod, anArgs);
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40
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41 long myEnd = System.currentTimeMillis();
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42
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43 System.err.println("Method: " + aMethod + ": " + (myEnd - myStart) +
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44 " ms (" + myStart + ")");
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45
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46 return myResult;
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47 }
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48 }