/*
* 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.LogParserFactory;
import org.krakenapps.log.api.LogParserFactoryRegistry;
import org.krakenapps.log.api.LogParserFactoryRegistryEventListener;
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-parser-factory-registry")
@Provides(specifications = { LogParserFactoryRegistry.class })
public class LogParserFactoryRegistryImpl extends ServiceTracker implements LogParserFactoryRegistry {
private final Logger logger = LoggerFactory.getLogger(LogParserFactoryRegistryImpl.class);
private ConcurrentMap<String, LogParserFactory> factoryMap;
private Set<LogParserFactoryRegistryEventListener> callbacks;
public LogParserFactoryRegistryImpl(BundleContext bc) {
super(bc, LogParserFactory.class.getName(), null);
this.factoryMap = new ConcurrentHashMap<String, LogParserFactory>();
this.callbacks = Collections.newSetFromMap(new ConcurrentHashMap<LogParserFactoryRegistryEventListener, 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) {
LogParserFactory factory = (LogParserFactory) super.addingService(reference);
register(factory);
return factory;
}
@Override
public void removedService(ServiceReference reference, Object service) {
LogParserFactory factory = (LogParserFactory) service;
unregister(factory);
super.removedService(reference, service);
}
@Override
public Collection<String> getNames() {
return new ArrayList<String>(factoryMap.keySet());
}
@Override
public LogParserFactory get(String name) {
if (name == null)
return null;
return factoryMap.get(name);
}
@Override
public void register(LogParserFactory factory) {
verifyArgs(factory);
LogParserFactory old = factoryMap.putIfAbsent(factory.getName(), factory);
if (old != null)
throw new IllegalStateException("duplicated log parser factory mapping: " + factory.getName());
for (LogParserFactoryRegistryEventListener callback : callbacks) {
try {
callback.factoryAdded(factory);
} catch (Exception e) {
logger.warn("kraken-log-api: callback should not throw any exception", e);
}
}
logger.info("kraken-log-api: new parser factory added for [{}]", factory.getName());
}
@Override
public void unregister(LogParserFactory factory) {
verifyArgs(factory);
LogParserFactory old = factoryMap.get(factory.getName());
if (old != factory) {
logger.warn("kraken-log-api: cannot unregister log parser factory {}", factory.getName());
return;
}
factoryMap.remove(factory.getName());
for (LogParserFactoryRegistryEventListener callback : callbacks) {
try {
callback.factoryRemoved(factory);
} catch (Exception e) {
logger.warn("kraken-log-api: callback should not throw any exception", e);
}
}
logger.info("kraken-log-api: parser factory removed for [{}]", factory.getName());
}
private void verifyArgs(LogParserFactory factory) {
if (factory == null)
throw new IllegalArgumentException("parser factory must be not null");
}
@Override
public void addEventListener(LogParserFactoryRegistryEventListener callback) {
if (callback == null)
throw new IllegalArgumentException("parser factory event listener must be not null");
callbacks.add(callback);
}
@Override
public void removeEventListener(LogParserFactoryRegistryEventListener callback) {
if (callback == null)
throw new IllegalArgumentException("parser factory event listener must be not null");
callbacks.remove(callback);
}
}