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    1   /***
    2    *
    3    * Copyright 2004 Protique Ltd
    4    *
    5    * Licensed under the Apache License, Version 2.0 (the "License");
    6    * you may not use this file except in compliance with the License.
    7    * You may obtain a copy of the License at
    8    *
    9    * http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   *
    17   **/
    18  package org.codehaus.activemq.transport;
    19
    20  import org.codehaus.activemq.message.WireFormat;
    21  import org.codehaus.activemq.util.FactoryFinder;
    22
    23  import javax.jms.JMSException;
    24  import java.io.IOException;
    25  import java.net.URI;
    26
    27  /***
    28   * A TransportChannel is used for tranporting packets between nodes
    29   *
    30   * @version $Revision: 1.12 $
    31   */
    32  public class TransportChannelProvider {
    33      private static FactoryFinder finder = new FactoryFinder("META-INF/services/org/codehaus/activemq/transport/");
    34
    35      /***
    36       * Create a Channel to a remote Node - e.g. a Broker
    37       *
    38       * @param remoteLocation
    39       * @return the TransportChannel bound to the remote node
    40       * @throws JMSException
    41       */
    42      public static TransportChannel create(WireFormat wireFormat, URI remoteLocation) throws JMSException {
    43          return getFactory(remoteLocation).create(wireFormat, remoteLocation);
    44      }
    45
    46      /***
    47       * Create a Channel to a remote Node - e.g. a Broker
    48       *
    49       * @param remoteLocation
    50       * @param localLocation  -
    51       *                       e.g. local InetAddress and local port
    52       * @return the TransportChannel bound to the remote node
    53       * @throws JMSException
    54       */
    55      public static TransportChannel create(WireFormat wireFormat, URI remoteLocation, URI localLocation) throws JMSException {
    56          return getFactory(remoteLocation).create(wireFormat, remoteLocation, localLocation);
    57      }
    58
    59      public static TransportChannelFactory getFactory(URI remoteLocation) throws JMSException {
    60          String protocol = remoteLocation.getScheme();
    61          try {
    62              Object value = finder.newInstance(protocol);
    63              if (value instanceof TransportChannelFactory) {
    64                  return (TransportChannelFactory) value;
    65              }
    66              else {
    67                  throw new JMSException("Factory does not implement TransportChannelFactory: " + value);
    68              }
    69          }
    70          catch (IllegalAccessException e) {
    71              throw createJMSexception(protocol, e);
    72          }
    73          catch (InstantiationException e) {
    74              throw createJMSexception(protocol, e);
    75          }
    76          catch (IOException e) {
    77              throw createJMSexception(protocol, e);
    78          }
    79          catch (ClassNotFoundException e) {
    80              throw createJMSexception(protocol, e);
    81          }
    82
    83      }
    84
    85      protected static JMSException createJMSexception(String protocol, Exception e) {
    86          JMSException answer = new JMSException("Could not load protocol: " + protocol + ". Reason: " + e);
    87          answer.setLinkedException(e);
    88          return answer;
    89      }
    90  }