/*
* Copyright (c) 2004-2009 QOS.ch
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package org.slf4j.profiler;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.Marker;
import org.slf4j.MarkerFactory;
// + Profiler [BAS]
// |-- elapsed time [doX] 0 milliseconds.
// |-- elapsed time [doYYYYY] 56 milliseconds.
// |--+ Profiler Y
// |-- elapsed time [doZ] 21 milliseconds.
// |-- elapsed time [doZ] 21 milliseconds.
// |-- Total elapsed time [Y] 78 milliseconds.
// |-- elapsed time [doZ] 21 milliseconds.
// |-- Total elapsed time [BAS] 78 milliseconds.
/**
* A poor man's profiler to measure the time elapsed performing some lengthy
* task.
*
* @author Ceki Gülcü
*/
public class Profiler implements TimeInstrument {
final static String PROFILER_MARKER_NAME = "PROFILER";
final static int MIN_SW_NAME_LENGTH = 24;
final static int MIN_SW_ELAPSED_TIME_NUMBER_LENGTH = 9;
final String name;
final StopWatch globalStopWatch;
List<TimeInstrument> childTimeInstrumentList = new ArrayList<TimeInstrument>();
// optional field
ProfilerRegistry profilerRegistry;
// optional field
Logger logger;
public Profiler(String name) {
this.name = name;
this.globalStopWatch = new StopWatch(name);
}
public String getName() {
return name;
}
public ProfilerRegistry getProfilerRegistry() {
return profilerRegistry;
}
public void registerWith(ProfilerRegistry profilerRegistry) {
if (profilerRegistry == null) {
return;
}
this.profilerRegistry = profilerRegistry;
profilerRegistry.put(this);
}
public Logger getLogger() {
return logger;
}
public void setLogger(Logger logger) {
this.logger = logger;
}
/**
* Starts a child stop watch and stops any previously started time
* instruments.
*/
public void start(String name) {
stopLastTimeInstrument();
StopWatch childSW = new StopWatch(name);
childTimeInstrumentList.add(childSW);
}
public Profiler startNested(String name) {
stopLastTimeInstrument();
Profiler nestedProfiler = new Profiler(name);
nestedProfiler.registerWith(profilerRegistry);
nestedProfiler.setLogger(logger);
childTimeInstrumentList.add(nestedProfiler);
return nestedProfiler;
}
TimeInstrument getLastTimeInstrument() {
if (childTimeInstrumentList.size() > 0) {
return childTimeInstrumentList.get(childTimeInstrumentList.size() - 1);
} else {
return null;
}
}
void stopLastTimeInstrument() {
TimeInstrument last = getLastTimeInstrument();
if (last != null) {
last.stop();
}
}
// void stopNestedProfilers() {
// for (Object child : childTimeInstrumentList) {
// if (child instanceof Profiler)
// ((Profiler) child).stop();
// }
// }
public long elapsedTime() {
return globalStopWatch.elapsedTime();
}
public TimeInstrument stop() {
stopLastTimeInstrument();
globalStopWatch.stop();
return this;
}
public TimeInstrumentStatus getStatus() {
return globalStopWatch.status;
}
/**
* This method is used in tests.
*/
void sanityCheck() throws IllegalStateException {
if (getStatus() != TimeInstrumentStatus.STOPPED) {
throw new IllegalStateException("time instrument [" + getName()
+ " is not stopped");
}
long totalElapsed = globalStopWatch.elapsedTime();
long childTotal = 0;
for (TimeInstrument ti : childTimeInstrumentList) {
childTotal += ti.elapsedTime();
if (ti.getStatus() != TimeInstrumentStatus.STOPPED) {
throw new IllegalStateException("time instrument [" + ti.getName()
+ " is not stopped");
}
if (ti instanceof Profiler) {
Profiler nestedProfiler = (Profiler) ti;
nestedProfiler.sanityCheck();
}
}
if (totalElapsed < childTotal) {
throw new IllegalStateException(
"children have a higher accumulated elapsed time");
}
}
static String TOP_PROFILER_FIRST_PREFIX = "+";
static String NESTED_PROFILER_FIRST_PREFIX = "|---+";
static String TOTAL_ELAPSED = " Total ";
static String SUBTOTAL_ELAPSED = " Subtotal ";
static String ELAPSED_TIME = " elapsed time ";
public void print() {
System.out.println(toString());
}
@Override
public String toString() {
DurationUnit du = Util.selectDurationUnitForDisplay(globalStopWatch);
return buildProfilerString(du, TOP_PROFILER_FIRST_PREFIX, TOTAL_ELAPSED, "");
}
public void log() {
Marker profilerMarker = MarkerFactory.getMarker(PROFILER_MARKER_NAME);
if (logger == null) {
throw new NullPointerException(
"If you invoke the log() method, then you must associate a logger with this profiler.");
}
if (logger.isDebugEnabled(profilerMarker)) {
DurationUnit du = Util.selectDurationUnitForDisplay(globalStopWatch);
String r = buildProfilerString(du, TOP_PROFILER_FIRST_PREFIX,
TOTAL_ELAPSED, "");
logger.debug(profilerMarker, SpacePadder.LINE_SEP + r);
}
}
/**
* Return a copy of the child instrument list for this Profiler instance.
*
* @return a copy of this instance's child time instrument list
* @since 1.5.9
*/
public List<TimeInstrument> getCopyOfChildTimeInstruments() {
List<TimeInstrument> copy = new ArrayList<TimeInstrument>(childTimeInstrumentList);
return copy;
}
/**
* Return a copy of the global stopwath of this Profiler instance.
*
* @return a copy of this instance's global stop watch
* @since 1.5.9
*/
public StopWatch getCopyOfGlobalStopWatch() {
StopWatch copy = new StopWatch(globalStopWatch);
return copy;
}
private String buildProfilerString(DurationUnit du, String firstPrefix,
String label, String indentation) {
StringBuffer buf = new StringBuffer();
buf.append(firstPrefix);
buf.append(" Profiler [");
buf.append(name);
buf.append("]");
buf.append(SpacePadder.LINE_SEP);
for (TimeInstrument child : childTimeInstrumentList) {
if (child instanceof StopWatch) {
buildStopWatchString(buf, du, ELAPSED_TIME, indentation,
(StopWatch) child);
} else if (child instanceof Profiler) {
Profiler profiler = (Profiler) child;
String subString = profiler.buildProfilerString(du,
NESTED_PROFILER_FIRST_PREFIX, SUBTOTAL_ELAPSED, indentation
+ " ");
buf.append(subString);
buildStopWatchString(buf, du, ELAPSED_TIME, indentation,
profiler.globalStopWatch);
}
}
buildStopWatchString(buf, du, label, indentation, globalStopWatch);
return buf.toString();
}
private static void buildStopWatchString(StringBuffer buf, DurationUnit du,
String prefix, String indentation, StopWatch sw) {
buf.append(indentation);
buf.append("|--");
buf.append(prefix);
SpacePadder.leftPad(buf, "[" + sw.getName() + "]", MIN_SW_NAME_LENGTH);
buf.append(" ");
String timeStr = Util.durationInDurationUnitsAsStr(sw.elapsedTime(), du);
SpacePadder.leftPad(buf, timeStr, MIN_SW_ELAPSED_TIME_NUMBER_LENGTH);
buf.append(" ");
Util.appendDurationUnitAsStr(buf, du);
buf.append(SpacePadder.LINE_SEP);
}
}