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/*
* Copyright 2000-2014 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.client;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.logging.Logger;
import com.google.gwt.core.client.Duration;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsArray;
import com.google.gwt.core.shared.GWT;
/**
* Lightweight profiling tool that can be used to collect profiling data with
* zero overhead unless enabled. To enable profiling, add
* <set-property name="vaadin.profiler" value="true" /> to
* your .gwt.xml file.
*
* @author Vaadin Ltd
* @since 7.0.0
*/
public class Profiler {
/**
* Class to include using deferred binding to enable the profiling.
*
* @author Vaadin Ltd
* @since 7.0.0
*/
public static class EnabledProfiler extends Profiler {
@Override
protected boolean isImplEnabled() {
return true;
}
}
/**
* Interface for getting data from the {@link Profiler}.
*
* Warning! This interface is most likely to change in the future
*
* @since 7.1
* @author Vaadin Ltd
*/
public interface ProfilerResultConsumer {
public void addProfilerData(Node rootNode, List totals);
public void addBootstrapData(LinkedHashMap timings);
}
/**
* A hierarchical representation of the time spent running a named block of
* code.
*
* Warning! This class is most likely to change in the future and is
* therefore defined in this class in an internal package instead of
* Profiler where it might seem more logical.
*/
public static class Node {
private final String name;
private final LinkedHashMap children = new LinkedHashMap();
private double time = 0;
private int count = 0;
private double enterTime = 0;
private double minTime = 1000000000;
private double maxTime = 0;
/**
* Create a new node with the given name.
*
* @param name
*/
public Node(String name) {
this.name = name;
}
/**
* Gets the name of the node
*
* @return the name of the node
*/
public String getName() {
return name;
}
/**
* Creates a new child node or retrieves and existing child and updates
* its total time and hit count.
*
* @param name
* the name of the child
* @param timestamp
* the timestamp for when the node is entered
* @return the child node object
*/
public Node enterChild(String name, double timestamp) {
Node child = children.get(name);
if (child == null) {
child = new Node(name);
children.put(name, child);
}
child.enterTime = timestamp;
child.count++;
return child;
}
/**
* Gets the total time spent in this node, including time spent in sub
* nodes
*
* @return the total time spent, in milliseconds
*/
public double getTimeSpent() {
return time;
}
/**
* Gets the minimum time spent for one invocation of this node,
* including time spent in sub nodes
*
* @return the time spent for the fastest invocation, in milliseconds
*/
public double getMinTimeSpent() {
return minTime;
}
/**
* Gets the maximum time spent for one invocation of this node,
* including time spent in sub nodes
*
* @return the time spent for the slowest invocation, in milliseconds
*/
public double getMaxTimeSpent() {
return maxTime;
}
/**
* Gets the number of times this node has been entered
*
* @return the number of times the node has been entered
*/
public int getCount() {
return count;
}
/**
* Gets the total time spent in this node, excluding time spent in sub
* nodes
*
* @return the total time spent, in milliseconds
*/
public double getOwnTime() {
double time = getTimeSpent();
for (Node node : children.values()) {
time -= node.getTimeSpent();
}
return time;
}
/**
* Gets the child nodes of this node
*
* @return a collection of child nodes
*/
public Collection getChildren() {
return Collections.unmodifiableCollection(children.values());
}
private void buildRecursiveString(StringBuilder builder, String prefix) {
if (getName() != null) {
String msg = getStringRepresentation(prefix);
builder.append(msg + '\n');
}
String childPrefix = prefix + "*";
for (Node node : children.values()) {
node.buildRecursiveString(builder, childPrefix);
}
}
@Override
public String toString() {
return getStringRepresentation("");
}
public String getStringRepresentation(String prefix) {
if (getName() == null) {
return "";
}
String msg = prefix + " " + getName() + " in " + getTimeSpent()
+ " ms.";
if (getCount() > 1) {
msg += " Invoked "
+ getCount()
+ " times ("
+ roundToSignificantFigures(getTimeSpent() / getCount())
+ " ms per time, min "
+ roundToSignificantFigures(getMinTimeSpent())
+ " ms, max "
+ roundToSignificantFigures(getMaxTimeSpent())
+ " ms).";
}
if (!children.isEmpty()) {
double ownTime = getOwnTime();
msg += " " + ownTime + " ms spent in own code";
if (getCount() > 1) {
msg += " ("
+ roundToSignificantFigures(ownTime / getCount())
+ " ms per time)";
}
msg += '.';
}
return msg;
}
private static double roundToSignificantFigures(double num) {
// Number of significant digits
int n = 3;
if (num == 0) {
return 0;
}
final double d = Math.ceil(Math.log10(num < 0 ? -num : num));
final int power = n - (int) d;
final double magnitude = Math.pow(10, power);
final long shifted = Math.round(num * magnitude);
return shifted / magnitude;
}
public void sumUpTotals(Map totals) {
String name = getName();
if (name != null) {
Node totalNode = totals.get(name);
if (totalNode == null) {
totalNode = new Node(name);
totals.put(name, totalNode);
}
totalNode.time += getOwnTime();
totalNode.count += getCount();
totalNode.minTime = Math.min(totalNode.minTime,
getMinTimeSpent());
totalNode.maxTime = Math.max(totalNode.maxTime,
getMaxTimeSpent());
}
for (Node node : children.values()) {
node.sumUpTotals(totals);
}
}
/**
* @param timestamp
*/
public void leave(double timestamp) {
double elapsed = (timestamp - enterTime);
time += elapsed;
enterTime = 0;
if (elapsed < minTime) {
minTime = elapsed;
}
if (elapsed > maxTime) {
maxTime = elapsed;
}
}
}
private static final String evtGroup = "VaadinProfiler";
private static final class GwtStatsEvent extends JavaScriptObject {
protected GwtStatsEvent() {
// JSO constructor
}
private native String getEvtGroup()
/*-{
return this.evtGroup;
}-*/;
private native double getMillis()
/*-{
return this.millis;
}-*/;
private native String getSubSystem()
/*-{
return this.subSystem;
}-*/;
private native String getType()
/*-{
return this.type;
}-*/;
private native String getModuleName()
/*-{
return this.moduleName;
}-*/;
public final String getEventName() {
String group = getEvtGroup();
if (evtGroup.equals(group)) {
return getSubSystem();
} else {
return group + "." + getSubSystem();
}
}
}
private static ProfilerResultConsumer consumer;
/**
* Checks whether the profiling gathering is enabled.
*
* @return true if the profiling is enabled, else
* false
*/
public static boolean isEnabled() {
// This will be fully inlined by the compiler
Profiler create = GWT.create(Profiler.class);
return create.isImplEnabled();
}
/**
* Enters a named block. There should always be a matching invocation of
* {@link #leave(String)} when leaving the block. Calls to this method will
* be removed by the compiler unless profiling is enabled.
*
* @param name
* the name of the entered block
*/
public static void enter(String name) {
if (isEnabled()) {
logGwtEvent(name, "begin");
}
}
/**
* Leaves a named block. There should always be a matching invocation of
* {@link #enter(String)} when entering the block. Calls to this method will
* be removed by the compiler unless profiling is enabled.
*
* @param name
* the name of the left block
*/
public static void leave(String name) {
if (isEnabled()) {
logGwtEvent(name, "end");
}
}
private static native final void logGwtEvent(String name, String type)
/*-{
$wnd.__gwtStatsEvent({
evtGroup: @com.vaadin.client.Profiler::evtGroup,
moduleName: @com.google.gwt.core.client.GWT::getModuleName()(),
millis: (new Date).getTime(),
sessionId: undefined,
subSystem: name,
type: type
});
}-*/;
/**
* Resets the collected profiler data. Calls to this method will be removed
* by the compiler unless profiling is enabled.
*/
public static void reset() {
if (isEnabled()) {
/*
* Old implementations might call reset for initialization, so
* ensure it is initialized here as well. Initialization has no side
* effects if already done.
*/
initialize();
clearEventsList();
}
}
/**
* Initializes the profiler. This should be done before calling any other
* function in this class. Failing to do so might cause undesired behavior.
* This method has no side effects if the initialization has already been
* done.
*
* Please note that this method should be called even if the profiler is not
* enabled because it will then remove a logger function that might have
* been included in the HTML page and that would leak memory unless removed.
*
*
* @since 7.0.2
*/
public static void initialize() {
if (isEnabled()) {
ensureLogger();
} else {
ensureNoLogger();
}
}
/**
* Outputs the gathered profiling data to the debug console.
*/
public static void logTimings() {
if (!isEnabled()) {
getLogger().warning(
"Profiler is not enabled, no data has been collected.");
return;
}
LinkedList stack = new LinkedList();
Node rootNode = new Node(null);
stack.add(rootNode);
JsArray gwtStatsEvents = getGwtStatsEvents();
if (gwtStatsEvents.length() == 0) {
getLogger()
.warning(
"No profiling events recorded, this might happen if another __gwtStatsEvent handler is installed.");
return;
}
for (int i = 0; i < gwtStatsEvents.length(); i++) {
GwtStatsEvent gwtStatsEvent = gwtStatsEvents.get(i);
String eventName = gwtStatsEvent.getEventName();
String type = gwtStatsEvent.getType();
boolean isBeginEvent = "begin".equals(type);
Node stackTop = stack.getLast();
boolean inEvent = eventName.equals(stackTop.getName())
&& !isBeginEvent;
if (!inEvent && stack.size() >= 2
&& eventName.equals(stack.get(stack.size() - 2).getName())
&& !isBeginEvent) {
// back out of sub event
stackTop.leave(gwtStatsEvent.getMillis());
stack.removeLast();
stackTop = stack.getLast();
inEvent = true;
}
if (type.equals("end")) {
if (!inEvent) {
getLogger().severe(
"Got end event for " + eventName
+ " but is currently in "
+ stackTop.getName());
return;
}
Node previousStackTop = stack.removeLast();
previousStackTop.leave(gwtStatsEvent.getMillis());
} else {
if (!inEvent) {
stackTop = stackTop.enterChild(eventName,
gwtStatsEvent.getMillis());
stack.add(stackTop);
}
if (!isBeginEvent) {
// Create sub event
stack.add(stackTop.enterChild(eventName + "." + type,
gwtStatsEvent.getMillis()));
}
}
}
if (stack.size() != 1) {
getLogger().warning(
"Not all nodes are left, the last node is "
+ stack.getLast().getName());
return;
}
Map totals = new HashMap();
rootNode.sumUpTotals(totals);
ArrayList totalList = new ArrayList(totals.values());
Collections.sort(totalList, new Comparator() {
@Override
public int compare(Node o1, Node o2) {
return (int) (o2.getTimeSpent() - o1.getTimeSpent());
}
});
if (getConsumer() != null) {
getConsumer().addProfilerData(stack.getFirst(), totalList);
}
}
/**
* Overridden in {@link EnabledProfiler} to make {@link #isEnabled()} return
* true if GWT.create returns that class.
*
* @return true if the profiling is enabled, else
* false
*/
protected boolean isImplEnabled() {
return false;
}
/**
* Outputs the time passed since various events recored in
* performance.timing if supported by the browser.
*/
public static void logBootstrapTimings() {
if (isEnabled()) {
double now = Duration.currentTimeMillis();
String[] keys = new String[] { "navigationStart",
"unloadEventStart", "unloadEventEnd", "redirectStart",
"redirectEnd", "fetchStart", "domainLookupStart",
"domainLookupEnd", "connectStart", "connectEnd",
"requestStart", "responseStart", "responseEnd",
"domLoading", "domInteractive",
"domContentLoadedEventStart", "domContentLoadedEventEnd",
"domComplete", "loadEventStart", "loadEventEnd" };
LinkedHashMap timings = new LinkedHashMap();
for (String key : keys) {
double value = getPerformanceTiming(key);
if (value == 0) {
// Ignore missing value
continue;
}
timings.put(key, Double.valueOf(now - value));
}
if (timings.isEmpty()) {
getLogger()
.info("Bootstrap timings not supported, please ensure your browser supports performance.timing");
return;
}
if (getConsumer() != null) {
getConsumer().addBootstrapData(timings);
}
}
}
private static final native double getPerformanceTiming(String name)
/*-{
if ($wnd.performance && $wnd.performance.timing && $wnd.performance.timing[name]) {
return $wnd.performance.timing[name];
} else {
return 0;
}
}-*/;
private static native JsArray getGwtStatsEvents()
/*-{
return $wnd.vaadin.gwtStatsEvents || [];
}-*/;
/**
* Add logger if it's not already there, also initializing the event array
* if needed.
*/
private static native void ensureLogger()
/*-{
if (typeof $wnd.__gwtStatsEvent != 'function') {
if (typeof $wnd.vaadin.gwtStatsEvents != 'object') {
$wnd.vaadin.gwtStatsEvents = [];
}
$wnd.__gwtStatsEvent = function(event) {
$wnd.vaadin.gwtStatsEvents.push(event);
return true;
}
}
}-*/;
/**
* Remove logger function and event array if it seems like the function has
* been added by us.
*/
private static native void ensureNoLogger()
/*-{
if (typeof $wnd.vaadin.gwtStatsEvents == 'object') {
delete $wnd.vaadin.gwtStatsEvents;
if (typeof $wnd.__gwtStatsEvent == 'function') {
$wnd.__gwtStatsEvent = function() { return true; };
}
}
}-*/;
private static native JsArray clearEventsList()
/*-{
$wnd.vaadin.gwtStatsEvents = [];
}-*/;
/**
* Sets the profiler result consumer that is used to output the profiler
* data to the user.
*
* Warning! This is internal API and should not be used by
* applications or add-ons.
*
* @since 7.1.4
* @param profilerResultConsumer
* the consumer that gets profiler data
*/
public static void setProfilerResultConsumer(
ProfilerResultConsumer profilerResultConsumer) {
if (consumer != null) {
throw new IllegalStateException("The consumer has already been set");
}
consumer = profilerResultConsumer;
}
private static ProfilerResultConsumer getConsumer() {
return consumer;
}
private static Logger getLogger() {
return Logger.getLogger(Profiler.class.getName());
}
}