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/*
* Copyright 2008-2010 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package com.sun.btrace.profiling;
import com.sun.btrace.Profiler;
import java.util.HashMap;
import java.util.Map;
/**
* Implementation of {@linkplain Profiler}
* @author Jaroslav Bachorik
*/
public class MethodInvocationProfiler extends Profiler implements Profiler.MBeanValueProvider {
private static class MethodInvocationRecorder {
private int stackSize = 200;
private int stackPtr = -1;
private int stackBndr = 150;
private Record[] stackArr = new Record[stackSize];
private int measuredSize = 0;
private int measuredPtr = 0;
private Record[] measured = new Record[0];
private long carryOver = 0L;
private int defaultBufferSize;
public MethodInvocationRecorder(int expectedBlockCnt) {
defaultBufferSize = expectedBlockCnt * 10;
measuredSize = defaultBufferSize;
measured = new Record[measuredSize];
}
private synchronized void recordEntry(String blockName) {
Record r = new Record(blockName);
addMeasured(r);
push(r);
carryOver = 0L; // clear the carryOver; not 2 subsequent calls to recordExit
}
private synchronized void recordExit(String blockName, long duration) {
Record r = pop();
if (r == null) {
r = new Record(blockName);
addMeasured(r);
}
r.wallTime = duration;
r.selfTime += duration - carryOver;
for(int i=0;i stackBndr) {
stackSize *= 1.5;
stackBndr *= 1.5;
Record[] newStack = new Record[stackSize];
System.arraycopy(stackArr, 0, newStack, 0, stackPtr + 1);
stackArr = newStack;
}
stackArr[++stackPtr] = r;
r.onStack = true;
}
private Record pop() {
Record r = stackPtr > -1 ? stackArr[stackPtr--] : null;
if (r != null) {
r.onStack = false;
}
return r;
}
private Record peek() {
return stackPtr > -1 ? stackArr[stackPtr] : null;
}
private void addMeasured(Record r) {
if (measuredPtr == measuredSize) {
compactMeasured();
}
measured[measuredPtr++] = r;
}
private synchronized void reset() {
Record[] newMeasured = new Record[defaultBufferSize + stackPtr + 1];
if (stackPtr > -1) {
System.arraycopy(stackArr, 0, newMeasured, 0, stackPtr + 1);
}
measuredPtr = stackPtr + 1;
measured = newMeasured;
measuredSize = measured.length;
}
private int compactMeasured() {
Map indexMap = new HashMap();
int lastIndex = 0;
for(int i=0;i mr.selfTimeMax ? m.selfTime : mr.selfTimeMax;
mr.selfTimeMin = m.selfTime < mr.selfTimeMin ? m.selfTime : mr.selfTimeMin;
mr.wallTimeMax = m.wallTime > mr.wallTimeMax ? m.wallTime : mr.wallTimeMax;
mr.wallTimeMin = m.wallTime < mr.wallTimeMin ? m.wallTime : mr.wallTimeMin;
for(int j=0;j recorders = new HashMap(128);
volatile private Snapshot lastValidSnapshot = null;
private int expectedBlockCnt;
public MethodInvocationProfiler(int expectedMethodCnt) {
this.expectedBlockCnt = expectedMethodCnt;
}
public void recordEntry(String blockName) {
getThreadSampler().recordEntry(blockName);
}
public void recordExit(String blockName, long duration) {
getThreadSampler().recordExit(blockName, duration);
}
public void reset() {
synchronized(recorders) {
for(MethodInvocationRecorder r : recorders.values()) {
r.reset();
}
}
}
private long lastTs = START_TIME;
public Snapshot snapshot(boolean reset) {
synchronized(recorders) {
Map idMap = new HashMap();
Record[] mergedRecords = null;
int mergedEntries = 0, mergedCapacity = 0;
for(Map.Entry sEntry : recorders.entrySet()) {
final Record[] records = sEntry.getValue().getRecords(reset);
if (records == null || records.length == 0) continue; // just skip the empty data
if (mergedRecords == null) {
mergedRecords = records;
mergedCapacity = mergedRecords.length;
for(int i=0;i mergedCapacity) {
mergedCapacity = (int)((mergedEntries + 1) * 1.25);
Record[] newRecs = new Record[mergedCapacity];
System.arraycopy(mergedRecords, 0, newRecs, 0, mergedEntries - 1);
mergedRecords = newRecs;
}
idMap.put(r.blockName, id);
mergedRecords[id] = r;
} else {
Record merged = mergedRecords[id];
merged.invocations += r.invocations;
merged.selfTime += r.selfTime;
merged.wallTime += r.wallTime;
}
}
}
Record[] rslt = new Record[mergedEntries];
if (mergedRecords != null) {
System.arraycopy(mergedRecords, 0, rslt, 0, mergedEntries);
}
long curTs = System.currentTimeMillis();
Snapshot snp = new Snapshot(rslt, lastTs, curTs);
lastTs = curTs;
lastValidSnapshot = snp;
return snp;
}
}
public Snapshot getMBeanValue() {
return lastValidSnapshot;
}
private MethodInvocationRecorder getThreadSampler() {
Thread t = Thread.currentThread();
MethodInvocationRecorder s = recorders.get(t);
if (s == null) {
synchronized(recorders) {
if (!recorders.containsKey(t)) {
s = new MethodInvocationRecorder(expectedBlockCnt);
recorders.put(t, s);
}
}
}
return s;
}
}
