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.commons.httpclient.Header;
029 import org.apache.commons.httpclient.HttpClient;
030 import org.apache.commons.httpclient.HttpMethod;
031 import org.apache.commons.httpclient.methods.GetMethod;
032 import org.apache.commons.io.IOUtils;
033
034 /**
035 * A polling HTTP consumer which by default performs a GET
036 *
037 * @version $Revision: 774740 $
038 */
039 public class HttpPollingConsumer extends PollingConsumerSupport {
040 private final HttpEndpoint endpoint;
041 private HttpClient httpClient;
042
043 public HttpPollingConsumer(HttpEndpoint endpoint) {
044 super(endpoint);
045 this.endpoint = endpoint;
046 httpClient = endpoint.createHttpClient();
047 }
048
049 public Exchange receive() {
050 return receiveNoWait();
051 }
052
053 public Exchange receive(long timeout) {
054 return receiveNoWait();
055 }
056
057 public Exchange receiveNoWait() {
058 HttpExchange exchange = (HttpExchange) endpoint.createExchange();
059 HttpMethod method = createMethod();
060
061 try {
062 int responseCode = httpClient.executeMethod(method);
063 // lets store the result in the output message.
064 LoadingByteArrayOutputStream bos = new LoadingByteArrayOutputStream();
065 InputStream is = method.getResponseBodyAsStream();
066 try {
067 IOUtils.copy(is, bos);
068 bos.flush();
069 } finally {
070 is.close();
071 }
072 Message message = exchange.getIn();
073 message.setBody(bos.createInputStream());
074
075 // lets set the headers
076 Header[] headers = method.getResponseHeaders();
077 HeaderFilterStrategy strategy = endpoint.getHeaderFilterStrategy();
078 for (Header header : headers) {
079 String name = header.getName();
080 String value = header.getValue();
081 if (strategy != null && !strategy.applyFilterToExternalHeaders(name, value, exchange)) {
082 message.setHeader(name, value);
083 }
084 }
085
086 message.setHeader(Exchange.HTTP_RESPONSE_CODE, responseCode);
087 return exchange;
088 } catch (IOException e) {
089 throw new RuntimeCamelException(e);
090 } finally {
091 method.releaseConnection();
092 }
093 }
094
095 // Properties
096 //-------------------------------------------------------------------------
097 public HttpClient getHttpClient() {
098 return httpClient;
099 }
100
101 public void setHttpClient(HttpClient httpClient) {
102 this.httpClient = httpClient;
103 }
104
105 // Implementation methods
106 //-------------------------------------------------------------------------
107 protected HttpMethod createMethod() {
108 String uri = endpoint.getEndpointUri();
109 return new GetMethod(uri);
110 }
111
112 protected void doStart() throws Exception {
113 }
114
115 protected void doStop() throws Exception {
116 }
117 }