/*
* 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.sling.commons.log.logback.internal;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.atomic.AtomicInteger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.core.status.ErrorStatus;
import ch.qos.logback.core.util.StatusPrinter;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.InvalidSyntaxException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Activator implements BundleActivator {
private LogbackManager logManager;
private BundleContext context;
private Timer timer;
private long startTime;
private static final AtomicInteger counter = new AtomicInteger();
public static final long INIT_TASK_PERIOD_MSEC = 1;
public void start(BundleContext context) throws Exception {
this.context = context;
this.startTime = System.currentTimeMillis();
this.timer = new Timer(getClass().getSimpleName() + "#" + counter.incrementAndGet());
// SLING-3189 - Check if SLF4J is currently initialized then start
// LogbackManager straightaway otherwise initialize
// it in a separate thread
if(isSlf4jInitialized()){
initializeLogbackManager(true);
} else {
System.out.println("Slf4j is not initialized yet. Delaying Logback support initialization");
timer.schedule(new LogbackInitializerTask(),0,INIT_TASK_PERIOD_MSEC);
}
}
public void stop(BundleContext context) throws Exception {
if(timer != null){
timer.cancel();
timer = null;
}
if (logManager != null) {
logManager.shutdown();
logManager = null;
}
}
private void initializeLogbackManager(boolean immediateInit) throws InvalidSyntaxException {
logManager = new LogbackManager(context);
final Logger log = LoggerFactory.getLogger(getClass());
if(immediateInit) {
log.info("LogbackManager initialized at bundle startup");
} else {
log.info("LogbackManager initialized after waiting for Slf4j, {} msec after startup", System.currentTimeMillis() - startTime);
}
}
private class LogbackInitializerTask extends TimerTask{
public LogbackInitializerTask() {
}
@Override
public void run() {
if(!isSlf4jInitialized()){
return;
}
try {
initializeLogbackManager(false);
} catch (Exception e) {
StringBuilder sb = new StringBuilder();
StatusPrinter.buildStr(sb, "", new ErrorStatus("Error occurred " +
"while starting Logback integration",this,e));
System.err.print(sb.toString());
}
cancel();
timer.cancel();
}
}
private static boolean isSlf4jInitialized(){
return LoggerFactory.getILoggerFactory() instanceof LoggerContext;
}
}