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/**
* 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.transport.discovery;
import java.io.IOException;
import java.net.URI;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.activemq.util.FactoryFinder;
import org.apache.activemq.util.IOExceptionSupport;
public abstract class DiscoveryAgentFactory {
private static final FactoryFinder DISCOVERY_AGENT_FINDER = new FactoryFinder("META-INF/services/org/apache/activemq/transport/discoveryagent/");
private static final ConcurrentHashMap DISCOVERY_AGENT_FACTORYS = new ConcurrentHashMap();
/**
* @param uri
* @return
* @throws IOException
*/
private static DiscoveryAgentFactory findDiscoveryAgentFactory(URI uri) throws IOException {
String scheme = uri.getScheme();
if (scheme == null) {
throw new IOException("DiscoveryAgent scheme not specified: [" + uri + "]");
}
DiscoveryAgentFactory daf = DISCOVERY_AGENT_FACTORYS.get(scheme);
if (daf == null) {
// Try to load if from a META-INF property.
try {
daf = (DiscoveryAgentFactory)DISCOVERY_AGENT_FINDER.newInstance(scheme);
DISCOVERY_AGENT_FACTORYS.put(scheme, daf);
} catch (Throwable e) {
throw IOExceptionSupport.create("DiscoveryAgent scheme NOT recognized: [" + scheme + "]", e);
}
}
return daf;
}
public static DiscoveryAgent createDiscoveryAgent(URI uri) throws IOException {
DiscoveryAgentFactory tf = findDiscoveryAgentFactory(uri);
return tf.doCreateDiscoveryAgent(uri);
}
protected abstract DiscoveryAgent doCreateDiscoveryAgent(URI uri) throws IOException;
// {
// try {
// String type = ( uri.getScheme() == null ) ? uri.getPath() :
// uri.getScheme();
// DiscoveryAgent rc = (DiscoveryAgent)
// discoveryAgentFinder.newInstance(type);
// Map options = URISupport.parseParamters(uri);
// IntrospectionSupport.setProperties(rc, options);
// if( rc.getClass() == SimpleDiscoveryAgent.class ) {
// CompositeData data = URISupport.parseComposite(uri);
// ((SimpleDiscoveryAgent)rc).setServices(data.getComponents());
// }
// return rc;
// } catch (Throwable e) {
// throw IOExceptionSupport.create("Could not create discovery agent: "+uri,
// e);
// }
// }
}