001    /** 
002     * 
003     * Copyright 2004 Protique Ltd
004     * 
005     * Licensed under the Apache License, Version 2.0 (the "License"); 
006     * you may not use this file except in compliance with the License. 
007     * 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     **/
018    package org.activemq.transport;
019    
020    import org.activemq.io.WireFormat;
021    import org.activemq.util.FactoryFinder;
022    
023    import javax.jms.JMSException;
024    import java.io.IOException;
025    import java.net.URI;
026    import java.net.URISyntaxException;
027    
028    /**
029     * locates a protocol specific TransportServerChannelFactory
030     *
031     * @version $Revision: 1.1.1.1 $
032     */
033    public class TransportServerChannelProvider {
034    
035        private static FactoryFinder finder = new FactoryFinder("META-INF/services/org/activemq/transport/server/");
036    
037        /**
038         * Create a Channel used for the Broker to listen to remove connections
039         *
040         * @param bindAddress
041         * @return the TransportServerChannel bound to the address
042         * @throws JMSException
043         */
044        public static TransportServerChannel create(WireFormat wireFormat, URI bindAddress) throws JMSException {
045            return getFactory(bindAddress.getScheme()).create(wireFormat, bindAddress);
046        }
047    
048        /**
049         * Create a Channel used for the Broker to listen to remove connections
050         *
051         * @param bindAddress
052         * @return the TransportServerChannel bound to the address
053         * @throws JMSException
054         */
055        public static TransportServerChannel newInstance(WireFormat wireFormat, String bindAddress) throws JMSException, URISyntaxException {
056            return create(wireFormat, new URI(bindAddress));
057        }
058    
059        protected static TransportServerChannelFactory getFactory(String protocol) throws JMSException {
060            try {
061                Object value = finder.newInstance(protocol);
062                if (value instanceof TransportServerChannelFactory) {
063                    return (TransportServerChannelFactory) value;
064                }
065                else {
066                    throw new JMSException("Factory does not implement TransportServerChannelFactory: " + value);
067                }
068            }
069            catch (IllegalAccessException e) {
070                throw createJMSexception(protocol, e);
071            }
072            catch (InstantiationException e) {
073                throw createJMSexception(protocol, e);
074            }
075            catch (IOException e) {
076                throw createJMSexception(protocol, e);
077            }
078            catch (ClassNotFoundException e) {
079                throw createJMSexception(protocol, e);
080            }
081    
082        }
083    
084        protected static JMSException createJMSexception(String protocol, Exception e) {
085            JMSException answer = new JMSException("Could not load protocol: " + protocol + ". Reason: " + e);
086            answer.setLinkedException(e);
087            return answer;
088        }
089    }