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Exerimental Minimal Tomcat for Programmatic Use
/*
* 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.RejectedExecutionException;
import java.util.concurrent.RejectedExecutionHandler;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.LogRecord;
/**
* A {@link FileHandler} implementation that uses a queue of log entries.
*
* 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:
*
*
* org.apache.juli.AsyncOverflowDropType Default value: 1org.apache.juli.AsyncMaxRecordCount Default value: 10000
*
* See the System Properties page in the configuration reference of Tomcat.
*
*/
public class AsyncFileHandler extends FileHandler {
static final String THREAD_PREFIX = "AsyncFileHandlerWriter-";
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 DEFAULT_OVERFLOW_DROP_TYPE = 1;
public static final int DEFAULT_MAX_RECORDS = 10000;
public static final int OVERFLOW_DROP_TYPE = Integer.parseInt(
System.getProperty("org.apache.juli.AsyncOverflowDropType", Integer.toString(DEFAULT_OVERFLOW_DROP_TYPE)));
public static final int MAX_RECORDS = Integer
.parseInt(System.getProperty("org.apache.juli.AsyncMaxRecordCount", Integer.toString(DEFAULT_MAX_RECORDS)));
private static final LoggerExecutorService LOGGER_SERVICE = new LoggerExecutorService(OVERFLOW_DROP_TYPE,
MAX_RECORDS);
private final Object closeLock = new Object();
protected volatile boolean closed = false;
private final LoggerExecutorService loggerService;
public AsyncFileHandler() {
this(null, null, null);
}
public AsyncFileHandler(String directory, String prefix, String suffix) {
this(directory, prefix, suffix, null);
}
public AsyncFileHandler(String directory, String prefix, String suffix, Integer maxDays) {
this(directory, prefix, suffix, maxDays, LOGGER_SERVICE);
}
AsyncFileHandler(String directory, String prefix, String suffix, Integer maxDays,
LoggerExecutorService loggerService) {
super(directory, prefix, suffix, maxDays);
loggerService.registerHandler();
this.loggerService = loggerService;
}
@Override
public void close() {
if (closed) {
return;
}
synchronized (closeLock) {
if (closed) {
return;
}
closed = true;
}
loggerService.deregisterHandler();
super.close();
}
@Override
public void open() {
if (!closed) {
return;
}
synchronized (closeLock) {
if (!closed) {
return;
}
closed = false;
}
loggerService.registerHandler();
super.open();
}
@Override
public void publish(LogRecord record) {
if (!isLoggable(record)) {
return;
}
// fill source entries, before we hand the record over to another
// thread with another class loader
record.getSourceMethodName();
loggerService.execute(new Runnable() {
@Override
public void run() {
/*
* During Tomcat shutdown, the Handlers are closed before the executor queue is flushed therefore the
* closed flag is ignored if the executor is shutting down.
*/
if (!closed || loggerService.isTerminating()) {
publishInternal(record);
}
}
});
}
protected void publishInternal(LogRecord record) {
super.publish(record);
}
static class LoggerExecutorService extends ThreadPoolExecutor {
private static final ThreadFactory THREAD_FACTORY = new ThreadFactory(THREAD_PREFIX);
/*
* Implementation note: Use of this count could be extended to start/stop the LoggerExecutorService but that
* would require careful locking as the current size of the queue also needs to be taken into account and there
* are lost of edge cases when rapidly starting and stopping handlers.
*/
private final AtomicInteger handlerCount = new AtomicInteger();
LoggerExecutorService(final int overflowDropType, final int maxRecords) {
super(1, 1, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingDeque<>(maxRecords), THREAD_FACTORY);
switch (overflowDropType) {
case OVERFLOW_DROP_LAST:
default:
setRejectedExecutionHandler(new DropLastPolicy());
break;
case OVERFLOW_DROP_FIRST:
setRejectedExecutionHandler(new DiscardOldestPolicy());
break;
case OVERFLOW_DROP_FLUSH:
setRejectedExecutionHandler(new DropFlushPolicy());
break;
case OVERFLOW_DROP_CURRENT:
setRejectedExecutionHandler(new DiscardPolicy());
}
}
@Override
public LinkedBlockingDeque getQueue() {
return (LinkedBlockingDeque) super.getQueue();
}
public void registerHandler() {
handlerCount.incrementAndGet();
}
public void deregisterHandler() {
int newCount = handlerCount.decrementAndGet();
if (newCount == 0) {
try {
Thread dummyHook = new Thread();
Runtime.getRuntime().addShutdownHook(dummyHook);
Runtime.getRuntime().removeShutdownHook(dummyHook);
} catch (IllegalStateException ise) {
// JVM is shutting down.
// Allow up to 10s for for the queue to be emptied
shutdown();
try {
awaitTermination(10, TimeUnit.SECONDS);
} catch (InterruptedException e) {
// Ignore
}
shutdownNow();
}
}
}
}
private static class DropFlushPolicy implements RejectedExecutionHandler {
@Override
public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
while (true) {
if (executor.isShutdown()) {
break;
}
try {
if (executor.getQueue().offer(r, 1000, TimeUnit.MILLISECONDS)) {
break;
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RejectedExecutionException("Interrupted", e);
}
}
}
}
private static class DropLastPolicy implements RejectedExecutionHandler {
@Override
public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
if (!executor.isShutdown()) {
((LoggerExecutorService) executor).getQueue().pollLast();
executor.execute(r);
}
}
}
}