/*
* 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.log4j;
import org.apache.log4j.helpers.
AppenderAttachableImpl;
import org.apache.log4j.spi.
LoggingEvent;
/**
* Obsolete AsyncAppender dispatcher provided for compatibility only.
*
* @deprecated Since 1.3.
*/
class
Dispatcher extends
Thread {
/**
* @deprecated
*/
private org.apache.log4j.helpers.
BoundedFIFO bf;
private
AppenderAttachableImpl aai;
private boolean
interrupted = false;
AsyncAppender container;
/**
*
* @param bf
* @param container
* @deprecated
*/
Dispatcher(org.apache.log4j.helpers.
BoundedFIFO bf,
AsyncAppender container) {
this.
bf =
bf;
this.
container =
container;
this.
aai =
container.
aai;
// It is the user's responsibility to close appenders before
// exiting.
this.
setDaemon(true);
// set the dispatcher priority to lowest possible value
this.
setPriority(
Thread.
MIN_PRIORITY);
this.
setName("Dispatcher-" +
getName());
// set the dispatcher priority to MIN_PRIORITY plus or minus 2
// depending on the direction of MIN to MAX_PRIORITY.
//+ (Thread.MAX_PRIORITY > Thread.MIN_PRIORITY ? 1 : -1)*2);
}
void
close() {
synchronized (
bf) {
interrupted = true;
// We have a waiting dispacther if and only if bf.length is
// zero. In that case, we need to give it a death kiss.
if (
bf.
length() == 0) {
bf.
notify();
}
}
}
/**
* The dispatching strategy is to wait until there are events in the buffer
* to process. After having processed an event, we release the monitor
* (variable bf) so that new events can be placed in the buffer, instead of
* keeping the monitor and processing the remaining events in the buffer.
*
* <p>
* Other approaches might yield better results.
* </p>
*/
public void
run() {
//Category cat = Category.getInstance(Dispatcher.class.getName());
LoggingEvent event;
while (true) {
synchronized (
bf) {
if (
bf.
length() == 0) {
// Exit loop if interrupted but only if the the buffer is empty.
if (
interrupted) {
//cat.info("Exiting.");
break;
}
try {
//LogLog.debug("Waiting for new event to dispatch.");
bf.
wait();
} catch (
InterruptedException e) {
break;
}
}
event =
bf.
get();
if (
bf.
wasFull()) {
//LogLog.debug("Notifying AsyncAppender about freed space.");
bf.
notify();
}
}
// synchronized
synchronized (
container.
aai) {
if ((
aai != null) && (
event != null)) {
aai.
appendLoopOnAppenders(
event);
}
}
}
// while
// close and remove all appenders
aai.
removeAllAppenders();
}
}