/***** BEGIN LICENSE BLOCK *****
* Version: CPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Common Public
* License Version 1.0 (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.eclipse.org/legal/cpl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2007 Ola Bini <ola.bini@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
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* decision by deleting the provisions above and replace them with the notice
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* the provisions above, a recipient may use your version of this file under
* the terms of any one of the CPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby.util;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.HashMap;
import java.util.WeakHashMap;
import org.jruby.runtime.Frame;
import org.jruby.runtime.ThreadContext;
/**
* @author <a href="mailto:ola.bini@gmail.com">Ola Bini</a>
*/
public class SimpleSampler {
private final static Map<ThreadContext, Object> CURRENT = new WeakHashMap<ThreadContext, Object>();
private final static Map<String, Integer> SAMPLES = new HashMap<String, Integer>();
private final static List<List<String>> TRACES = new ArrayList<List<String>>();
private static boolean reported = false;
public static void registerThreadContext(ThreadContext tc) {
synchronized(CURRENT) {
CURRENT.put(tc, null);
}
}
public static void startSampleThread() {
new Thread(new Runnable() {
public void run() {
SimpleSampler.runSampling();
}
}).start();
}
public static void report() {
if(!reported) {
System.err.println();
System.err.println("Samples - ");
List<String> samples = new ArrayList<String>();
samples.addAll(SAMPLES.keySet());
Collections.sort(samples, new Comparator<String>(){
public int compare(String o1, String o2) {
return SAMPLES.get(o2) - SAMPLES.get(o1);
}
});
for(List<String> ls : TRACES) {
if(ls.size() > 1) {
System.err.println("Trace #" + System.identityHashCode(ls));
for(String ss : ls) {
System.err.println(" " + ss);
}
System.err.println();
}
}
String BLANKS = " ";
for(String ss : samples) {
int len = Math.max(60 - ss.length(), 0);
System.err.println(" " + ss + BLANKS.substring(0,len) + "==> " + SAMPLES.get(ss));
}
reported = true;
}
}
private static void runSampling() {
long interval = Long.parseLong(System.getProperty("jruby.sampling.interval", "10"));
int depth = Integer.parseInt(System.getProperty("jruby.sampling.depth", "5"));
System.err.println("[Sampling with");
System.err.println(" - interval: " + interval);
System.err.println(" - depth: " + depth + "]");
synchronized(CURRENT) {
while(!reported) {
try {
CURRENT.wait(interval);
} catch(InterruptedException e) {}
try {
for(ThreadContext tc : CURRENT.keySet()) {
if(tc != null) {
Frame[] frames = tc.createBacktrace(1, false);
if(frames != null) {
List<String> trace = new ArrayList<String>(depth);
for(int i = (Math.max(frames.length - depth,0)); i<frames.length; i++) {
Frame f = frames[i];
String name = f.getKlazz() + "#" + f.getName();
if(!f.isBindingFrame() && !name.equals("null#null")) {
trace.add(name);
Integer v = SAMPLES.get(name);
if(v == null) {
v = 1;
} else {
v++;
}
SAMPLES.put(name, v);
}
}
TRACES.add(trace);
}
}
}
} catch(Exception e) {}
}
}
}
}// SimpleSampler