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/*
* Copyright (c) 2018 Eike Stepper (Berlin, Germany) and others.
* 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.util.om.log;
import org.eclipse.net4j.internal.util.bundle.OM;
import org.eclipse.net4j.util.StringUtil;
import org.eclipse.net4j.util.collection.AbstractIterator;
import org.eclipse.net4j.util.collection.CloseableIterator;
import org.eclipse.net4j.util.concurrent.Worker;
import org.eclipse.net4j.util.io.IOUtil;
import org.eclipse.net4j.util.om.log.RollingLog.LogLine;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
import java.util.concurrent.atomic.AtomicLong;
/**
* @author Eike Stepper
* @since 3.8
*/
public class RollingLog extends Worker implements Log, Iterable<LogLine>
{
private final String logFile;
private final long logSize;
private final AtomicLong logLineCounter = new AtomicLong(0);
private int fileNumber;
private boolean fileAppend;
private List<LogLine> queue = new ArrayList<LogLine>();
public RollingLog(String logFile, long logSize, boolean append)
{
this.logFile = logFile;
this.logSize = logSize;
fileAppend = append;
setDaemon(true);
}
public final String getLogFile()
{
return logFile;
}
public final long getLogSize()
{
return logSize;
}
public final void log(String message)
{
LogLine logLine = createLogLine(message);
synchronized (this)
{
logLine.id = logLineCounter.incrementAndGet();
queue.add(logLine);
notifyAll();
}
}
@Override
protected final void work(WorkContext context) throws Exception
{
List<LogLine> logLines;
synchronized (this)
{
if (queue.isEmpty())
{
try
{
wait(100);
}
catch (InterruptedException ex)
{
context.terminate();
}
context.nextWork();
}
logLines = queue;
queue = new ArrayList<LogLine>();
}
writeLogLines(logLines);
}
protected LogLine createLogLine(String message)
{
long millis = System.currentTimeMillis();
String thread = getThreadInfo();
return new LogLine(millis, thread, message);
}
protected void writeLogLines(List<LogLine> logLines)
{
if (logFile != null)
{
PrintStream out = null;
try
{
File file = getFile();
out = new PrintStream(new FileOutputStream(file, fileAppend));
writeLogLines(logLines, out);
out.close();
}
catch (IOException ex)
{
OM.LOG.error(ex);
}
finally
{
fileAppend = true;
IOUtil.closeSilent(out);
}
}
else
{
writeLogLines(logLines, System.out);
}
}
protected void writeLogLines(List<LogLine> logLines, PrintStream out)
{
for (LogLine logLine : logLines)
{
writeLogLine(logLine, out);
}
}
protected void writeLogLine(LogLine logLine, PrintStream out)
{
out.println(logLine);
}
protected String getThreadInfo()
{
return Thread.currentThread().getName();
}
@Override
protected void doActivate() throws Exception
{
if (fileAppend)
{
int number = getLastFileNumber();
if (number == -1)
{
fileAppend = false;
}
else
{
long lastID = 0;
for (LogIterator iterator = new LogIterator(logFile, number); iterator.hasNext();)
{
LogLine logLine = iterator.next();
lastID = logLine.getID();
}
logLineCounter.set(lastID);
}
}
super.doActivate();
}
private int getLastFileNumber()
{
int lastFileNumber = -1;
for (int i = 0; i < Integer.MAX_VALUE; i++)
{
File file = getFile(logFile, i);
if (!file.isFile())
{
break;
}
lastFileNumber = i;
}
return lastFileNumber;
}
private File getFile()
{
File file;
for (;;)
{
file = getFile(logFile, fileNumber);
if (fileAppend && file.length() > logSize)
{
fileNumber++;
fileAppend = false;
continue;
}
break;
}
return file;
}
private static File getFile(String logFile, int fileNumber)
{
return new File(logFile + String.format("-%04d", fileNumber) + ".txt");
}
public final CloseableIterator<LogLine> iterator()
{
return iterator(logFile);
}
public static CloseableIterator<LogLine> iterator(String logFile)
{
return new LogIterator(logFile, 0);
}
/**
* @author Eike Stepper
*/
private static final class LogIterator extends AbstractIterator<LogLine> implements CloseableIterator<LogLine>
{
private static final int CLOSED = -1;
private final String logFile;
private int fileNumber;
private BufferedReader reader;
public LogIterator(String logFile, int fileNumber)
{
this.logFile = logFile;
this.fileNumber = fileNumber;
}
@Override
protected Object computeNextElement()
{
if (fileNumber == CLOSED)
{
return END_OF_DATA;
}
if (reader == null)
{
File file = getFile(logFile, fileNumber++);
if (file.isFile())
{
try
{
reader = new BufferedReader(new FileReader(file));
}
catch (FileNotFoundException ex)
{
OM.LOG.error(ex);
return END_OF_DATA;
}
}
else
{
return END_OF_DATA;
}
}
try
{
String string = reader.readLine();
if (string == null)
{
reader.close();
reader = null;
return computeNextElement();
}
return new LogLine(string);
}
catch (IOException ex)
{
OM.LOG.error(ex);
return END_OF_DATA;
}
}
public void close()
{
IOUtil.close(reader);
reader = null;
fileNumber = CLOSED;
}
public boolean isClosed()
{
return fileNumber == CLOSED;
}
}
/**
* @author Eike Stepper
*/
public static final class LogLine
{
private static final String NL = "\n\r";
private static final String TAB = "\t";
private static final String TABNL = TAB + NL;
private long id;
private final long millis;
private final String thread;
private final String message;
public LogLine(long millis, String thread, String message)
{
this.millis = millis;
this.thread = StringUtil.translate(thread, TABNL, " ");
this.message = StringUtil.translate(message, NL, " ");
}
public LogLine(String string)
{
StringTokenizer tokenizer = new StringTokenizer(string, TAB);
id = Long.parseLong(tokenizer.nextToken());
millis = Long.parseLong(tokenizer.nextToken());
thread = tokenizer.nextToken();
message = tokenizer.nextToken("").substring(1);
}
public long getID()
{
return id;
}
public long getMillis()
{
return millis;
}
public String getThread()
{
return thread;
}
public String getMessage()
{
return message;
}
@Override
public String toString()
{
return id + TAB + millis + TAB + thread + TAB + message;
}
}
}
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