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/*******************************************************************************
* Copyright (c) 2017 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.log.stream;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.osgi.framework.Bundle;
import org.osgi.framework.ServiceFactory;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.log.LogEntry;
import org.osgi.service.log.LogReaderService;
import org.osgi.service.log.stream.LogStreamProvider;
import org.osgi.util.tracker.ServiceTracker;
public class LogStreamProviderFactory implements ServiceFactory<LogStreamProvider> {
Map<Bundle, LogStreamProviderImpl> providers = new HashMap<>();
ReentrantReadWriteLock eventProducerLock = new ReentrantReadWriteLock();
ServiceTracker<LogReaderService, AtomicReference<LogReaderService>> logReaderService;
public LogStreamProviderFactory(ServiceTracker<LogReaderService, AtomicReference<LogReaderService>> logReaderService) {
this.logReaderService = logReaderService;
}
/*Reader of providers map
* 1) for each provider
* - post entry to provider
*/
public void postLogEntry(LogEntry entry) {
eventProducerLock.readLock().lock();
try {
for (LogStreamProviderImpl provider : providers.values()) {
provider.logged(entry);
}
} finally {
eventProducerLock.readLock().unlock();
}
}
/* Writer to providers map
* 1) create new LogStreamProviderImpl
* 2) put new instance in map
* 3) return new instance
* (non-Javadoc)
* @see org.osgi.framework.ServiceFactory#getService(org.osgi.framework.Bundle, org.osgi.framework.ServiceRegistration)
*/
@Override
public LogStreamProviderImpl getService(Bundle bundle, ServiceRegistration<LogStreamProvider> registration) {
LogStreamProviderImpl logStreamProviderImpl = new LogStreamProviderImpl(logReaderService);
eventProducerLock.writeLock().lock();
try {
providers.put(bundle, logStreamProviderImpl);
return logStreamProviderImpl;
} finally {
eventProducerLock.writeLock().unlock();
}
}
/* 1) Remove the logStreamProviderImpl instance associated with the bundle
* 2) close all existing LogStreams from the provider, outside the write lock
* (non-Javadoc)
* @see org.osgi.framework.ServiceFactory#ungetService(org.osgi.framework.Bundle, org.osgi.framework.ServiceRegistration, java.lang.Object)
*/
@Override
public void ungetService(Bundle bundle, ServiceRegistration<LogStreamProvider> registration, LogStreamProvider service) {
LogStreamProviderImpl logStreamProviderImpl;
eventProducerLock.writeLock().lock();
try {
logStreamProviderImpl = providers.remove(bundle);
} finally {
eventProducerLock.writeLock().unlock();
}
logStreamProviderImpl.close();
}
}
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