/*
* 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.activemq.artemis.osgi;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.activemq.artemis.api.core.Interceptor;
import org.apache.activemq.artemis.spi.core.protocol.ProtocolManagerFactory;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTrackerCustomizer;
/**
* Tracks the available ProtocolManagerFactory services as well as the required protocols.
* When a new service appears the factory is added to the server.
* When all needed protocols are present the server is started.
* When required a service disappears the server is stopped.
*/
@SuppressWarnings("rawtypes")
public class ProtocolTracker implements ServiceTrackerCustomizer<ProtocolManagerFactory<Interceptor>, ProtocolManagerFactory<Interceptor>> {
private static Logger LOG = Logger.getLogger(ProtocolTracker.class.getName());
private String name;
private BundleContext context;
private Map<String, Boolean> protocols;
private ServerTrackerCallBack callback;
public ProtocolTracker(String name,
BundleContext context,
String[] requiredProtocols,
ServerTrackerCallBack callback) {
this.name = name;
this.context = context;
this.callback = callback;
this.protocols = new HashMap<>();
for (String requiredProtocol : requiredProtocols) {
this.protocols.put(requiredProtocol, false);
}
LOG.info("Broker config " + name + " found. Tracking protocols " + Arrays.asList(requiredProtocols));
}
@Override
public ProtocolManagerFactory addingService(ServiceReference<ProtocolManagerFactory<Interceptor>> reference) {
ProtocolManagerFactory<Interceptor> pmf = context.getService(reference);
callback.addFactory(pmf);
for (String protocol : pmf.getProtocols()) {
protocolAdded(protocol);
}
return pmf;
}
@Override
public void modifiedService(ServiceReference<ProtocolManagerFactory<Interceptor>> reference,
ProtocolManagerFactory<Interceptor> pmf) {
// Not supported
}
@Override
public void removedService(ServiceReference<ProtocolManagerFactory<Interceptor>> reference,
ProtocolManagerFactory<Interceptor> pmf) {
for (String protocol : pmf.getProtocols()) {
protocolRemoved(protocol);
}
callback.removeFactory(pmf);
}
private void protocolAdded(String protocol) {
Boolean present = this.protocols.get(protocol);
if (present != null && !present) {
this.protocols.put(protocol, true);
List<String> missing = getMissing();
LOG.info("Required protocol " + protocol + " was added for broker " + name + ". " +
(missing.isEmpty() ? "Starting broker." : "Still waiting for " + missing));
if (missing.isEmpty()) {
try {
callback.start();
} catch (Exception e) {
LOG.log(Level.WARNING, "Error starting broker " + name, e);
}
}
}
}
private void protocolRemoved(String protocol) {
Boolean present = this.protocols.get(protocol);
if (present != null && present) {
List<String> missing = getMissing();
LOG.info("Required protocol " + protocol + " was removed for broker " + name + ". " + (missing.isEmpty() ? "Stopping broker. " : ""));
if (missing.isEmpty()) {
try {
callback.stop();
} catch (Exception e) {
LOG.log(Level.WARNING, "Error stopping broker " + name, e);
}
}
this.protocols.put(protocol, false);
}
}
private List<String> getMissing() {
List<String> missing = new ArrayList<>();
for (String protocol : protocols.keySet()) {
Boolean present = protocols.get(protocol);
if (!present) {
missing.add(protocol);
}
}
return missing;
}
}