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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 under the terms of either the GPL or the LGPL, and not to allow others to use your version of this file under the terms of the CPL, indicate your decision by deleting the provisions above and replace them with the notice and other provisions required by the GPL or the LGPL. If you do not delete 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.List;
 import java.util.Map;
 

Author(s):
Ola Bini
 
 public class SimpleSampler {
     private final static Map<ThreadContextObjectCURRENT = new WeakHashMap<ThreadContextObject>();
     private final static Map<StringIntegerSAMPLES = new HashMap<StringInteger>();
     private final static List<List<String>> TRACES = new ArrayList<List<String>>();
     
     private static boolean reported = false;
 
     public static void registerThreadContext(ThreadContext tc) {
         synchronized() {
             .put(tcnull);
         }
     }
 
     public static void startSampleThread() {
         new Thread(new Runnable() {
                 public void run() {
                     SimpleSampler.runSampling();
                 }
             }).start();
     }
 
     public static void report() {
         if(!) {
             ..println();
             ..println("Samples - ");
             List<Stringsamples = new ArrayList<String>();
             samples.addAll(.keySet());
             Collections.sort(samplesnew Comparator<String>(){
                     public int compare(String o1String o2) {
                         return .get(o2) - .get(o1);
                     }
                 });
             for(List<Stringls : ) {
                 if(ls.size() > 1) {
                     ..println("Trace #" + System.identityHashCode(ls));
                     for(String ss : ls) {
                         ..println("  " + ss);
                     }
                     ..println();
                 }
             }
             String BLANKS = "                                                            ";
             for(String ss : samples) {
                 int len = Math.max(60 - ss.length(), 0);
                 ..println(" " + ss + BLANKS.substring(0,len) +  "==> " + .get(ss));
             }
              = 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"));
         ..println("[Sampling with");
         ..println(" - interval: " + interval);
         ..println(" - depth: " + depth + "]");
        synchronized() {
            while(!) {
                try {
                    .wait(interval);
                } catch(InterruptedException e) {}
                try {
                    for(ThreadContext tc : .keySet()) {
                        if(tc != null) {
                            Frame[] frames = tc.createBacktrace(1, false);
                            if(frames != null) {
                                List<Stringtrace = new ArrayList<String>(depth);
                                for(int i = (Math.max(frames.length - depth,0)); i<frames.lengthi++) {
                                    Frame f = frames[i];
                                    String name = f.getKlazz() + "#" + f.getName();
                                    if(!f.isBindingFrame() && !name.equals("null#null")) {
                                        trace.add(name);
                                        Integer v = .get(name);
                                        if(v == null) {
                                            v = 1;
                                        } else {
                                            v++;
                                        }
                                        .put(namev);
                                    }
                                }
                                .add(trace);
                            }
                        }
                    }
                } catch(Exception e) {}
            }
        } 
    }
}// SimpleSampler
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