HttpClientTransportChannel xref

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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.http;
    19
    20  import org.apache.commons.httpclient.HttpClient;
    21  import org.apache.commons.httpclient.HttpMethod;
    22  import org.apache.commons.httpclient.HttpStatus;
    23  import org.apache.commons.httpclient.methods.GetMethod;
    24  import org.apache.commons.httpclient.methods.PostMethod;
    25  import org.apache.commons.logging.Log;
    26  import org.apache.commons.logging.LogFactory;
    27  import org.codehaus.activemq.message.Packet;
    28  import org.codehaus.activemq.message.TextWireFormat;
    29  import org.codehaus.activemq.util.JMSExceptionHelper;
    30
    31  import javax.jms.JMSException;
    32  import java.io.DataInputStream;
    33  import java.io.IOException;
    34
    35  /***
    36   * A HTTP {@link org.codehaus.activemq.transport.TransportChannel} which uses the
    37   * <a href="http://jakarta.apache.org/commons/httpclient/">commons-httpclient</a> library
    38   *
    39   * @version $Revision: 1.1 $
    40   */
    41  public class HttpClientTransportChannel extends HttpTransportChannelSupport {
    42      private static final Log log = LogFactory.getLog(HttpClientTransportChannel.class);
    43
    44      private HttpClient sendHttpClient;
    45      private HttpClient receiveHttpClient;
    46
    47      public HttpClientTransportChannel(TextWireFormat wireFormat, String remoteUrl) {
    48          super(wireFormat, remoteUrl);
    49      }
    50
    51      public void asyncSend(Packet packet) throws JMSException {
    52          PostMethod httpMethod = new PostMethod(getRemoteUrl());
    53          configureMethod(httpMethod);
    54          httpMethod.setRequestBody(getWireFormat().toString(packet));
    55          try {
    56              int answer = getSendHttpClient().executeMethod(httpMethod);
    57              if (answer != HttpStatus.SC_OK) {
    58                  throw new JMSException("Failed to post packet: " + packet + " as response was: " + answer);
    59              }
    60          }
    61          catch (IOException e) {
    62              throw JMSExceptionHelper.newJMSException("Could not post packet: " + packet + " due to: " + e, e);
    63          }
    64      }
    65
    66      public boolean isMulticast() {
    67          return false;
    68      }
    69
    70      public void run() {
    71          log.trace("HTTP GET consumer thread starting for clientID: " + getClientID());
    72          HttpClient httpClient = getReceiveHttpClient();
    73          String remoteUrl = getRemoteUrl();
    74          while (!getClosed().get()) {
    75              GetMethod httpMethod = new GetMethod(remoteUrl);
    76              configureMethod(httpMethod);
    77              try {
    78                  int answer = httpClient.executeMethod(httpMethod);
    79                  if (answer != HttpStatus.SC_OK) {
    80                      if (answer == HttpStatus.SC_REQUEST_TIMEOUT) {
    81                          log.info("GET timed out");
    82                      }
    83                      else {
    84                          log.warn("Failed to perform GET on: " + remoteUrl + " as response was: " + answer);
    85                      }
    86                  }
    87                  else {
    88                      Packet packet = getWireFormat().readPacket(new DataInputStream(httpMethod.getResponseBodyAsStream()));
    89                      if (packet == null) {
    90                          log.warn("Received null packet from url: " + remoteUrl);
    91                      }
    92                      else {
    93                          doConsumePacket(packet);
    94                      }
    95                  }
    96              }
    97              catch (IOException e) {
    98                  log.warn("Failed to perform GET on: " + remoteUrl + " due to: " + e, e);
    99              }
    100         }
    101     }
    102
    103     // Properties
    104     //-------------------------------------------------------------------------
    105     public HttpClient getSendHttpClient() {
    106         if (sendHttpClient == null) {
    107             sendHttpClient = createHttpClient();
    108         }
    109         return sendHttpClient;
    110     }
    111
    112     public void setSendHttpClient(HttpClient sendHttpClient) {
    113         this.sendHttpClient = sendHttpClient;
    114     }
    115
    116     public HttpClient getReceiveHttpClient() {
    117         if (receiveHttpClient == null) {
    118             receiveHttpClient = createHttpClient();
    119         }
    120         return receiveHttpClient;
    121     }
    122
    123     public void setReceiveHttpClient(HttpClient receiveHttpClient) {
    124         this.receiveHttpClient = receiveHttpClient;
    125     }
    126
    127     // Implementation methods
    128     //-------------------------------------------------------------------------
    129     protected HttpClient createHttpClient() {
    130         return new HttpClient();
    131     }
    132
    133     protected void configureMethod(HttpMethod method) {
    134         String clientID = getClientID();
    135         if (clientID != null) {
    136             method.setRequestHeader("clientID", clientID);
    137         }
    138     }
    139 }