001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.component.queue;
018
019 import org.apache.camel.CamelContext;
020 import org.apache.camel.Component;
021 import org.apache.camel.Endpoint;
022 import org.apache.camel.EndpointResolver;
023 import org.apache.camel.Exchange;
024 import org.apache.camel.util.ObjectHelper;
025
026 import java.util.concurrent.BlockingQueue;
027 import java.util.concurrent.Callable;
028
029 /**
030 * An implementation of {@link EndpointResolver} that creates
031 * {@link QueueEndpoint} objects.
032 *
033 * The syntax for a Queue URI looks like:
034 *
035 * <pre><code>queue:[component:]queuename</code></pre>
036 * the component is optional, and if it is not specified, the default component name
037 * is assumed.
038 *
039 * @version $Revision: 519901 $
040 */
041 public class QueueEndpointResolver<E extends Exchange> implements EndpointResolver<E> {
042
043 public static final String DEFAULT_COMPONENT_NAME = QueueComponent.class.getName();
044
045 /**
046 * Finds the {@see QueueComponent} specified by the uri. If the {@see QueueComponent}
047 * object do not exist, it will be created.
048 *
049 * @see org.apache.camel.EndpointResolver#resolveComponent(org.apache.camel.CamelContext, java.lang.String)
050 */
051 public Component resolveComponent(CamelContext container, String uri) {
052 String id[] = getEndpointId(uri);
053 return resolveQueueComponent(container, id[0]);
054 }
055
056 /**
057 * Finds the {@see QueueEndpoint} specified by the uri. If the {@see QueueEndpoint} or it's associated
058 * {@see QueueComponent} object do not exist, they will be created.
059 *
060 * @see org.apache.camel.EndpointResolver#resolveEndpoint(org.apache.camel.CamelContext, java.lang.String)
061 */
062 public Endpoint<E> resolveEndpoint(CamelContext container, String uri) {
063 String id[] = getEndpointId(uri);
064 QueueComponent<E> component = resolveQueueComponent(container, id[0]);
065 BlockingQueue<E> queue = component.getOrCreateQueue(id[1]);
066 return new QueueEndpoint<E>(uri, container, queue);
067 }
068
069 /**
070 * @return an array that looks like: [componentName,endpointName]
071 */
072 private String[] getEndpointId(String uri) {
073 String rc [] = {DEFAULT_COMPONENT_NAME, null};
074 String splitURI[] = ObjectHelper.splitOnCharacter(uri, ":", 3);
075 if( splitURI[2] != null ) {
076 rc[0] = splitURI[1];
077 rc[1] = splitURI[2];
078 } else {
079 rc[0] = splitURI[1];
080 }
081 return rc;
082 }
083
084 @SuppressWarnings("unchecked")
085 private QueueComponent<E> resolveQueueComponent(CamelContext container, String componentName) {
086 Component rc = container.getOrCreateComponent(componentName, new Callable<Component>(){
087 public Component<E> call() throws Exception {
088 return new QueueComponent<E>();
089 }});
090 return (QueueComponent<E>) rc;
091 }
092
093 }