Author: [EMAIL PROTECTED]
Date: Mon Nov 10 11:12:57 2008
New Revision: 4000
Added:
releases/1.5/reference/dispatch/
releases/1.5/reference/dispatch/Dispatch.gwt.xml
releases/1.5/reference/dispatch/client/
releases/1.5/reference/dispatch/client/Dispatch.java
releases/1.5/reference/dispatch/client/Subject.java
releases/1.5/reference/dispatch/public/
releases/1.5/reference/dispatch/public/Dispatch.html
Log:
app measures speed of event dispatch
Added: releases/1.5/reference/dispatch/Dispatch.gwt.xml
==============================================================================
--- (empty file)
+++ releases/1.5/reference/dispatch/Dispatch.gwt.xml Mon Nov 10 11:12:57
2008
@@ -0,0 +1,6 @@
+<!DOCTYPE document SYSTEM
+
"http://google-web-toolkit.googlecode.com/svn/releases/1.5/distro-source/core/src/gwt-module.dtd";>
+<module>
+ <inherits name='com.google.gwt.user.User' />
+ <entry-point class='kellegous.client.Dispatch' />
+</module>
Added: releases/1.5/reference/dispatch/client/Dispatch.java
==============================================================================
--- (empty file)
+++ releases/1.5/reference/dispatch/client/Dispatch.java Mon Nov 10
11:12:57 2008
@@ -0,0 +1,143 @@
+package kellegous.client;
+
+import com.google.gwt.core.client.Duration;
+import com.google.gwt.core.client.EntryPoint;
+import com.google.gwt.core.client.GWT;
+import com.google.gwt.dom.client.DivElement;
+import com.google.gwt.dom.client.Document;
+import com.google.gwt.user.client.Command;
+import com.google.gwt.user.client.Event;
+import com.google.gwt.user.client.EventListener;
+
+public class Dispatch implements EntryPoint {
+ private static native Event createMockEvent() /*-{
+ return { type: "click" };
+ }-*/;
+
+ private static double[] runTrial(int numberOfObservers,
+ int numberOfIterations, int numberOfSamples) {
+ final double[] results = new double[numberOfSamples];
+ final EventListener subject = Subject.create(numberOfObservers);
+ final Event event = createMockEvent();
+ for (int j = 0; j < numberOfSamples; ++j) {
+ final Duration d = new Duration();
+ for (int i = 0; i < numberOfIterations; ++i) {
+ subject.onBrowserEvent(event);
+ }
+ results[j] = d.elapsedMillis();
+ }
+ return results;
+ }
+
+ private static native void schedule(Command command) /*-{
+ $wnd.setTimeout(function() {
+ [EMAIL PROTECTED]::execute()();
+ }, 0);
+ }-*/;
+
+ // t-distribution for p = 0.05 (used to compute 95% confidence
intervals).
+ // This table is based at df = 2.
+ private final static double[] TDIST = new double[] {
+ 4.3027, 3.1824, 2.7765, 2.5706, 2.4469, 2.3646, 2.3060, 2.2622,
2.2281,
+ 2.2010, 2.1788, 2.1604, 2.1448, 2.1315, 2.1199, 2.1098, 2.1009,
2.0930,
+ 2.0860, 2.0796, 2.0739, 2.0687, 2.0639, 2.0595, 2.0555, 2.0518,
2.0484,
+ 2.0452, 2.0423, 2.0395, 2.0369, 2.0345, 2.0322, 2.0301, 2.0281,
2.0262,
+ 2.0244, 2.0227, 2.0211, 2.0195, 2.0181, 2.0167, 2.0154, 2.0141,
2.0129,
+ 2.0117, 2.0106, 2.0096, 2.0086, 2.0076, 2.0066, 2.0057, 2.0049,
2.0040,
+ 2.0032, 2.0025, 2.0017, 2.0010, 2.0003, 1.9996, 1.9990, 1.9983,
1.9977,
+ 1.9971, 1.9966, 1.9960, 1.9955, 1.9949, 1.9944, 1.9939, 1.9935,
1.9930,
+ 1.9925, 1.9921, 1.9917, 1.9913, 1.9908, 1.9905, 1.9901, 1.9897,
1.9893,
+ 1.9890, 1.9886, 1.9883, 1.9879, 1.9876, 1.9873, 1.9870, 1.9867,
1.9864,
+ 1.9861, 1.9858, 1.9855, 1.9852, 1.9850, 1.9847, 1.9845, 1.9842,
1.9840};
+
+ private static double computeT(int df) {
+ return TDIST[df - 2];
+ }
+
+ private static double computeMean(double[] s) {
+ double sum = 0.0;
+ final int n = s.length;
+ for (int i = 0; i < n; ++i) {
+ sum += s[i];
+ }
+ return sum / n;
+ }
+
+ private static double computeStandardError(double[] data, double mean) {
+ final int n = data.length;
+ double sum = 0.0;
+ for (int i = 0; i < n; ++i) {
+ final double d = data[i] - mean;
+ sum += d * d;
+ }
+
+ return Math.sqrt(sum / n) / Math.sqrt(n);
+ }
+
+ private static class Stats {
+ private final double mean, upper, lower;
+
+ Stats(double[] data) {
+ mean = computeMean(data);
+ final double error = computeStandardError(data, mean);
+ final double t = computeT(data.length - 1);
+ upper = mean + t * error;
+ lower = mean - t * error;
+ }
+
+ @Override
+ public String toString() {
+ return mean + ", " + lower + ", " + upper;
+ }
+ }
+
+ public static class Runner {
+ private int n;
+ private final int max, numIterations, numSamples;
+ private Stats[] results;
+
+ Runner(int min, int max, int numIterations, int numSamples) {
+ n = min;
+ this.max = max;
+ this.numIterations = numIterations;
+ this.numSamples = numSamples;
+ results = new Stats[max - min + 1];
+ }
+
+ void finish() {
+ final Document document = Document.get();
+ final DivElement root = document.createDivElement();
+ document.getBody().appendChild(root);
+ for (int i = 0, n = results.length; i < n; ++i) {
+ final DivElement div = document.createDivElement();
+ root.appendChild(div);
+ div.setInnerText("" + results[i].toString());
+ }
+ }
+
+ void next() {
+ schedule(new Command() {
+ public void execute() {
+ final double[] results = runTrial(n, numIterations, numSamples);
+ Runner.this.results[n] = new Stats(results);
+ if (++n <= max) {
+ next();
+ } else {
+ finish();
+ }
+ }
+ });
+ }
+
+ void run() {
+ next();
+ }
+ }
+
+ public void onModuleLoad() {
+ // Don't run this in hosted mode.
+ if (GWT.isScript()) {
+ new Runner(0, 10, 10000, 20).run();
+ }
+ }
+}
Added: releases/1.5/reference/dispatch/client/Subject.java
==============================================================================
--- (empty file)
+++ releases/1.5/reference/dispatch/client/Subject.java Mon Nov 10 11:12:57
2008
@@ -0,0 +1,22 @@
+package kellegous.client;
+
+import com.google.gwt.user.client.EventListener;
+import com.google.gwt.user.client.ui.Button;
+import com.google.gwt.user.client.ui.ClickListener;
+import com.google.gwt.user.client.ui.Widget;
+
+public class Subject {
+ public static EventListener create(int numberOfObserver) {
+ final Button subject = new Button("a button");
+ for (int i = 0; i < numberOfObserver; ++i) {
+ subject.addClickListener(new ClickListener() {
+ private int count = 0;
+
+ public void onClick(Widget sender) {
+ count++;
+ }
+ });
+ }
+ return subject;
+ }
+}
Added: releases/1.5/reference/dispatch/public/Dispatch.html
==============================================================================
--- (empty file)
+++ releases/1.5/reference/dispatch/public/Dispatch.html Mon Nov 10
11:12:57 2008
@@ -0,0 +1,10 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+<html>
+ <head>
+ <meta http-equiv="content-type" content="text/html; charset=UTF-8">
+ <title>Dispatch5</title>
+ <script type="text/javascript" language="javascript"
src="kellegous.Dispatch.nocache.js"></script>
+ </head>
+ <body>
+ </body>
+</html>
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http://groups.google.com/group/Google-Web-Toolkit-Contributors
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