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.http;
018
019 import java.io.IOException;
020 import java.io.InputStream;
021
022 import org.apache.camel.Exchange;
023 import org.apache.camel.Message;
024 import org.apache.camel.RuntimeCamelException;
025 import org.apache.camel.component.http.helper.LoadingByteArrayOutputStream;
026 import org.apache.camel.impl.PollingConsumerSupport;
027 import org.apache.camel.spi.HeaderFilterStrategy;
028 import org.apache.camel.util.IOHelper;
029 import org.apache.camel.util.ObjectHelper;
030 import org.apache.commons.httpclient.Header;
031 import org.apache.commons.httpclient.HttpClient;
032 import org.apache.commons.httpclient.HttpMethod;
033 import org.apache.commons.httpclient.methods.GetMethod;
034
035 /**
036 * A polling HTTP consumer which by default performs a GET
037 *
038 * @version $Revision: 791695 $
039 */
040 public class HttpPollingConsumer extends PollingConsumerSupport {
041 private final HttpEndpoint endpoint;
042 private HttpClient httpClient;
043
044 public HttpPollingConsumer(HttpEndpoint endpoint) {
045 super(endpoint);
046 this.endpoint = endpoint;
047 httpClient = endpoint.createHttpClient();
048 }
049
050 public Exchange receive() {
051 return receiveNoWait();
052 }
053
054 public Exchange receive(long timeout) {
055 return receiveNoWait();
056 }
057
058 public Exchange receiveNoWait() {
059 Exchange exchange = endpoint.createExchange();
060 HttpMethod method = createMethod();
061
062 try {
063 int responseCode = httpClient.executeMethod(method);
064 // lets store the result in the output message.
065 LoadingByteArrayOutputStream bos = new LoadingByteArrayOutputStream();
066 InputStream is = method.getResponseBodyAsStream();
067 try {
068 IOHelper.copy(is, bos);
069 bos.flush();
070 } finally {
071 ObjectHelper.close(is, "input stream", null);
072 }
073 Message message = exchange.getIn();
074 message.setBody(bos.createInputStream());
075
076 // lets set the headers
077 Header[] headers = method.getResponseHeaders();
078 HeaderFilterStrategy strategy = endpoint.getHeaderFilterStrategy();
079 for (Header header : headers) {
080 String name = header.getName();
081 String value = header.getValue();
082 if (strategy != null && !strategy.applyFilterToExternalHeaders(name, value, exchange)) {
083 message.setHeader(name, value);
084 }
085 }
086
087 message.setHeader(Exchange.HTTP_RESPONSE_CODE, responseCode);
088 return exchange;
089 } catch (IOException e) {
090 throw new RuntimeCamelException(e);
091 } finally {
092 method.releaseConnection();
093 }
094 }
095
096 // Properties
097 //-------------------------------------------------------------------------
098 public HttpClient getHttpClient() {
099 return httpClient;
100 }
101
102 public void setHttpClient(HttpClient httpClient) {
103 this.httpClient = httpClient;
104 }
105
106 // Implementation methods
107 //-------------------------------------------------------------------------
108 protected HttpMethod createMethod() {
109 String uri = endpoint.getEndpointUri();
110 return new GetMethod(uri);
111 }
112
113 protected void doStart() throws Exception {
114 }
115
116 protected void doStop() throws Exception {
117 }
118 }