/*
* Copyright 2010 NCHOVY
*
* Licensed 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.krakenapps.log.api.impl;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.apache.felix.ipojo.annotations.Component;
import org.apache.felix.ipojo.annotations.Invalidate;
import org.apache.felix.ipojo.annotations.Provides;
import org.apache.felix.ipojo.annotations.Validate;
import org.krakenapps.log.api.LogNormalizerFactory;
import org.krakenapps.log.api.LogNormalizerFactoryRegistry;
import org.krakenapps.log.api.LogNormalizerFactoryRegistryEventListener;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTracker;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Component(name = "log-normalizer-registry")
@Provides(specifications = { LogNormalizerFactoryRegistry.class })
public class LogNormalizerFactoryRegistryImpl extends ServiceTracker implements LogNormalizerFactoryRegistry {
private final Logger logger = LoggerFactory.getLogger(LogNormalizerFactoryRegistryImpl.class.getName());
private ConcurrentMap<String, LogNormalizerFactory> factoryMap;
private Set<LogNormalizerFactoryRegistryEventListener> callbacks;
public LogNormalizerFactoryRegistryImpl(BundleContext bc) {
super(bc, LogNormalizerFactory.class.getName(), null);
factoryMap = new ConcurrentHashMap<String, LogNormalizerFactory>();
callbacks = Collections.newSetFromMap(new ConcurrentHashMap<LogNormalizerFactoryRegistryEventListener, Boolean>());
}
@Validate
public void start() {
reset();
super.open();
}
@Invalidate
public void stop() {
super.close();
reset();
}
private void reset() {
callbacks.clear();
factoryMap.clear();
}
@Override
public Object addingService(ServiceReference reference) {
LogNormalizerFactory normalizer = (LogNormalizerFactory) super.addingService(reference);
register(normalizer);
return normalizer;
}
@Override
public void removedService(ServiceReference reference, Object service) {
LogNormalizerFactory normalizer = (LogNormalizerFactory) service;
unregister(normalizer);
super.removedService(reference, service);
}
@Override
public Collection<String> getNames() {
return new ArrayList<String>(factoryMap.keySet());
}
@Override
public LogNormalizerFactory get(String loggerFactoryName) {
if (loggerFactoryName == null)
return null;
return factoryMap.get(loggerFactoryName);
}
@Override
public void register(LogNormalizerFactory normalizer) {
verifyArgs(normalizer);
LogNormalizerFactory old = factoryMap.putIfAbsent(normalizer.getName(), normalizer);
if (old != null)
throw new IllegalStateException("duplicated log normalizer mapping: " + normalizer.getName());
// invoke callbacks
for (LogNormalizerFactoryRegistryEventListener callback : callbacks) {
try {
callback.normalizerAdded(normalizer);
} catch (Exception e) {
logger.warn("log normalizer callback should not throw any exception", e);
}
}
}
@Override
public void unregister(LogNormalizerFactory normalizer) {
verifyArgs(normalizer);
LogNormalizerFactory old = factoryMap.get(normalizer.getName());
if (old != normalizer)
return;
factoryMap.remove(normalizer.getName());
// invoke callbacks
for (LogNormalizerFactoryRegistryEventListener callback : callbacks) {
try {
callback.normalizerRemoved(normalizer);
} catch (Exception e) {
logger.warn("log normalizer callback should not throw any exception", e);
}
}
}
private void verifyArgs(LogNormalizerFactory normalizer) {
if (normalizer == null)
throw new IllegalArgumentException("log normalizer must be not null");
}
@Override
public void addEventListener(LogNormalizerFactoryRegistryEventListener callback) {
if (callback == null)
throw new IllegalArgumentException("normalizer callback must be not null");
callbacks.add(callback);
}
@Override
public void removeEventListener(LogNormalizerFactoryRegistryEventListener callback) {
if (callback == null)
throw new IllegalArgumentException("normalizer callback must be not null");
callbacks.remove(callback);
}
}