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/*******************************************************************************
* Copyright (c) 2013 Red Hat Inc.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Red Hat Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.linuxtools.internal.perf;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.linuxtools.internal.perf.handlers.Messages;
import org.eclipse.linuxtools.internal.perf.model.PMStatEntry;
import org.eclipse.linuxtools.internal.perf.model.PMStatEntry.Type;
/**
* Class containing all functionality for comparting perf statistics data.
*/
public class StatComparisonData implements IPerfData {
// Old stats file.
private File oldFile;
// New stats file.
private File newFile;
// Comparison result string.
private String result = ""; //$NON-NLS-1$
// Title for this comparison run.
private String title;
public StatComparisonData(String title, File oldFile, File newFile) {
this.title = title;
this.oldFile = oldFile;
this.newFile = newFile;
}
@Override
public String getPerfData() {
return result;
}
@Override
public String getTitle() {
return title;
}
/**
* Compare stat data files and store the result in the result field.
*/
public void runComparison() {
ArrayList<PMStatEntry> statsDiff = getComparisonStats();
if (!statsDiff.isEmpty()) {
String[][] statsDiffStr = new String[statsDiff.size()][];
int currentRow = 0;
// gather comparison results in a string array
for (PMStatEntry statEntry : statsDiff) {
statsDiffStr[currentRow] = statEntry.toStringArray();
currentRow++;
}
// apply format to each entry and set the result
String format = getFormat(statsDiffStr);
String curLine;
for (String[] statEntry : statsDiffStr) {
curLine = String.format(format, (Object[]) statEntry);
curLine = curLine.contains(PMStatEntry.TIME) ? "\n" + curLine //$NON-NLS-1$
: curLine;
result += curLine;
}
} else{
}
}
/**
* Return a PMStatEntry array with the result of the comparison between the
* old and new stat data files
* @return
*/
public ArrayList<PMStatEntry> getComparisonStats() {
ArrayList<PMStatEntry> oldStats = collectStats(oldFile);
ArrayList<PMStatEntry> newStats = collectStats(newFile);
ArrayList<PMStatEntry> result = new ArrayList<PMStatEntry>();
for (PMStatEntry oldEntry : oldStats) {
for (PMStatEntry newEntry : newStats) {
if (oldEntry.equalEvents(newEntry)) {
result.add(oldEntry.compare(newEntry));
continue;
}
}
}
return result;
}
/**
* Collect statistics entries from the specified stat data file.
*
* @param file file to collect from
* @return List containing statistics entries from the given file.
*/
public static ArrayList<PMStatEntry> collectStats(File statFile) {
ArrayList<PMStatEntry> result = new ArrayList<PMStatEntry>();
BufferedReader statReader = null;
try {
statReader = new BufferedReader(new FileReader(statFile));
// pattern for a valid perf stat entry
Pattern entryPattern = Pattern.compile(PMStatEntry.getString(Type.ENTRY_PATTERN));
// pattern for last stat entry (seconds elapsed):
Pattern totalTimePattern = Pattern.compile(PMStatEntry.getString(Type.TIME_PATTERN));
String line;
while((line = statReader.readLine()) != null ){
line = line.trim();
Matcher match = entryPattern.matcher(line);
String samples, event, usage, units, delta, scale;
PMStatEntry statEntry;
if(match.find()){
// extract information from groups
samples = match.group(1);
event = match.group(2);
usage = match.group(6);
units = match.group(7);
delta = match.group(9);
scale = match.group(13);
// create stat entry
statEntry = new PMStatEntry(toFloat(samples), event,
toFloat(usage), units, toFloat(delta),
toFloat(scale));
// add stat entry to results list
result.add(statEntry);
} else if(line.contains(PMStatEntry.TIME)){
// match seconds elapsed pattern
match = totalTimePattern.matcher(line);
if(match.find()){
samples = match.group(1);
event = match.group(2);
delta = match.group(4);
// create stat entry
statEntry = new PMStatEntry(toFloat(samples),
event, 0, null, toFloat(delta), 0);
result.add(statEntry);
}
}
}
return result;
} catch (FileNotFoundException e) {
PerfPlugin.getDefault().openError(e, Messages.MsgError);
} catch (IOException e) {
PerfPlugin.getDefault().openError(e, Messages.MsgError);
} finally {
try {
if (statReader != null) {
statReader.close();
}
} catch (IOException e) {
PerfPlugin.getDefault().openError(e, Messages.PerfResourceLeak_title);
}
}
return result;
}
/**
* Get formatting string from unformatted table.
*
* @param table array to construct formatting for.
* @return Formatting string representing the proper way to format the given
* table.
*/
public String getFormat(String[][] table) {
// all entries have the same number of columns
int[] maxCharLen = new int[table[0].length];
// collect max number of characters per column
for (int i = 0; i < table.length; i++) {
for (int j = 0; j < table[i].length; j++) {
maxCharLen[j] = Math.max(maxCharLen[j], table[i][j].length());
}
}
// prepare format arguments
ArrayList<Integer> arguments = new ArrayList<Integer>();
for (int length : maxCharLen) {
arguments.add(length);
}
// generate format string
String entryFormat = String.format(
PMStatEntry.getString(Type.ENTRY_FORMAT),
arguments.toArray());
return entryFormat;
}
/**
* Get float representation of specified string.
*
* @param str String convert
* @return Float representation of string.
*/
public static float toFloat(String str) {
try {
// remove commas from number string representation
return (str == null) ? 0
: Float.parseFloat(str.replace(",", "")); //$NON-NLS-1$//$NON-NLS-2$
} catch (NumberFormatException e) {
return 0;
}
}
}
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