001    /**
002     *
003     * Licensed to the Apache Software Foundation (ASF) under one or more
004     * contributor license agreements.  See the NOTICE file distributed with
005     * this work for additional information regarding copyright ownership.
006     * The ASF licenses this file to You under the Apache License, Version 2.0
007     * (the "License"); you may not use this file except in compliance with
008     * the License.  You may obtain a copy of the License at
009     *
010     * http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.camel.impl;
019    
020    import org.apache.camel.CamelContext;
021    import org.apache.camel.Component;
022    import org.apache.camel.Endpoint;
023    import org.apache.camel.Exchange;
024    import org.apache.camel.util.IntrospectionSupport;
025    import org.apache.camel.util.URISupport;
026    import org.apache.camel.util.ObjectHelper;
027    
028    import java.net.URI;
029    import java.util.Map;
030    import java.util.concurrent.ScheduledExecutorService;
031    import java.util.concurrent.ScheduledThreadPoolExecutor;
032    import java.util.concurrent.ThreadFactory;
033    
034    /**
035     * @version $Revision: 541335 $
036     */
037    public abstract  class DefaultComponent<E extends Exchange> extends ServiceSupport implements Component<E> {
038    
039            private int defaultThreadPoolSize = 5;
040        private CamelContext camelContext;
041        private ScheduledExecutorService executorService;
042    
043        public DefaultComponent() {
044        }
045    
046        public DefaultComponent(CamelContext context) {
047            this.camelContext = context;
048        }
049    
050    
051        public Endpoint<E> createEndpoint(String uri) throws Exception {
052            ObjectHelper.notNull(getCamelContext(), "camelContext");        
053            URI u = new URI(uri);
054            String path = u.getHost();
055            if (path == null) {
056                path = u.getSchemeSpecificPart();
057            }
058            Map parameters = URISupport.parseParamters(u);
059    
060            Endpoint<E> endpoint = createEndpoint(uri, path, parameters);
061            if (endpoint == null) {
062                return null;
063            }
064            if (parameters != null) {
065                if (endpoint instanceof ScheduledPollEndpoint) {
066                    ScheduledPollEndpoint scheduledPollEndpoint = (ScheduledPollEndpoint) endpoint;
067                    scheduledPollEndpoint.configureProperties(parameters);
068                }
069                IntrospectionSupport.setProperties(endpoint, parameters);
070            }
071            return endpoint;
072        }
073    
074        public CamelContext getCamelContext() {
075            return camelContext;
076        }
077    
078        public void setCamelContext(CamelContext context) {
079            this.camelContext = context;
080        }
081    
082        public ScheduledExecutorService getExecutorService() {
083            if (executorService == null) {
084                executorService = createExecutorService();
085            }
086            return executorService;
087        }
088    
089        public void setExecutorService(ScheduledExecutorService executorService) {
090            this.executorService = executorService;
091        }
092    
093        /**
094         * A factory method to create a default thread pool and executor
095         */
096        protected ScheduledExecutorService createExecutorService() {
097            return new ScheduledThreadPoolExecutor(defaultThreadPoolSize, new ThreadFactory() {
098                int counter;
099    
100                public synchronized Thread newThread(Runnable runnable) {
101                    Thread thread = new Thread(runnable);
102                    thread.setName("Thread" + (++counter) + " " + DefaultComponent.this.toString());
103                    return thread;
104                }
105            });
106        }
107    
108        protected void doStart() throws Exception {
109        }
110    
111        protected void doStop() throws Exception {
112            if (executorService != null) {
113                executorService.shutdown();
114            }
115        }
116    
117    
118        /**
119         * A factory method allowing derived components to create a new endpoint from the given URI,
120         * remaining path and optional parameters
121         *
122         * @param uri        the full URI of the endpoint
123         * @param remaining  the remaining part of the URI without the query parameters or component prefix
124         * @param parameters the optional parameters passed in
125         * @return a newly created endpoint or null if the endpoint cannot be created based on the inputs
126         */
127        abstract protected Endpoint<E> createEndpoint(String uri, String remaining, Map parameters) throws Exception;
128    }