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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.juli;
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.TimeUnit;
import java.util.logging.LogRecord;
/**
* A {@link FileHandler} implementation that uses a queue of log entries.
*
* <p>Configuration properties are inherited from the {@link FileHandler}
* class. This class does not add its own configuration properties for the
* logging configuration, but relies on the following system properties
* instead:</p>
*
* <ul>
* <li><code>org.apache.juli.AsyncOverflowDropType</code>
* Default value: <code>1</code></li>
* <li><code>org.apache.juli.AsyncMaxRecordCount</code>
* Default value: <code>10000</code></li>
* <li><code>org.apache.juli.AsyncLoggerPollInterval</code>
* Default value: <code>1000</code></li>
* </ul>
*
* <p>See the System Properties page in the configuration reference of Tomcat.</p>
*/
public class AsyncFileHandler extends FileHandler {
public static final int OVERFLOW_DROP_LAST = 1;
public static final int OVERFLOW_DROP_FIRST = 2;
public static final int OVERFLOW_DROP_FLUSH = 3;
public static final int OVERFLOW_DROP_CURRENT = 4;
public static final int OVERFLOW_DROP_TYPE = Integer.parseInt(
System.getProperty("org.apache.juli.AsyncOverflowDropType","1"));
public static final int DEFAULT_MAX_RECORDS = Integer.parseInt(
System.getProperty("org.apache.juli.AsyncMaxRecordCount","10000"));
public static final int LOGGER_SLEEP_TIME = Integer.parseInt(
System.getProperty("org.apache.juli.AsyncLoggerPollInterval","1000"));
protected static final LinkedBlockingDeque<LogEntry> queue =
new LinkedBlockingDeque<>(DEFAULT_MAX_RECORDS);
protected static final LoggerThread logger = new LoggerThread();
static {
logger.start();
}
protected volatile boolean closed = false;
public AsyncFileHandler() {
this(null,null,null);
}
public AsyncFileHandler(String directory, String prefix, String suffix) {
super(directory, prefix, suffix);
open();
}
@Override
public void close() {
if (closed) return;
closed = true;
// TODO Auto-generated method stub
super.close();
}
@Override
protected void open() {
if(!closed) return;
closed = false;
// TODO Auto-generated method stub
super.open();
}
@Override
public void publish(LogRecord record) {
if (!isLoggable(record)) {
return;
}
LogEntry entry = new LogEntry(record,this);
boolean added = false;
try {
while (!added && !queue.offer(entry)) {
switch (OVERFLOW_DROP_TYPE) {
case OVERFLOW_DROP_LAST: {
//remove the last added element
queue.pollLast();
break;
}
case OVERFLOW_DROP_FIRST: {
//remove the first element in the queue
queue.pollFirst();
break;
}
case OVERFLOW_DROP_FLUSH: {
added = queue.offer(entry,1000,TimeUnit.MILLISECONDS);
break;
}
case OVERFLOW_DROP_CURRENT: {
added = true;
break;
}
}//switch
}//while
}catch (InterruptedException x) {
// Allow thread to be interrupted and back out of the publish
// operation. No further action required.
}
}
protected void publishInternal(LogRecord record) {
super.publish(record);
}
protected static class LoggerThread extends Thread {
protected final boolean run = true;
public LoggerThread() {
this.setDaemon(true);
this.setName("AsyncFileHandlerWriter-"+System.identityHashCode(this));
}
@Override
public void run() {
while (run) {
try {
LogEntry entry = queue.poll(LOGGER_SLEEP_TIME, TimeUnit.MILLISECONDS);
if (entry!=null) entry.flush();
} catch (InterruptedException x) {
// Ignore the attempt to interrupt the thread.
} catch (Exception x) {
x.printStackTrace();
}
}
}
}
protected static class LogEntry {
private final LogRecord record;
private final AsyncFileHandler handler;
public LogEntry(LogRecord record, AsyncFileHandler handler) {
super();
this.record = record;
this.handler = handler;
}
public boolean flush() {
if (handler.closed) {
return false;
} else {
handler.publishInternal(record);
return true;
}
}
}
}
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