View Javadoc

1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  package org.apache.http.nio.protocol;
28  
29  import java.io.IOException;
30  
31  import org.apache.http.ContentTooLongException;
32  import org.apache.http.HttpEntity;
33  import org.apache.http.HttpResponse;
34  import org.apache.http.annotation.ThreadSafe;
35  import org.apache.http.entity.ContentType;
36  import org.apache.http.nio.ContentDecoder;
37  import org.apache.http.nio.IOControl;
38  import org.apache.http.nio.entity.ContentBufferEntity;
39  import org.apache.http.nio.util.HeapByteBufferAllocator;
40  import org.apache.http.nio.util.SimpleInputBuffer;
41  import org.apache.http.protocol.HttpContext;
42  import org.apache.http.util.Asserts;
43  
44  /**
45   * Basic implementation of {@link HttpAsyncResponseConsumer}. Please note that
46   * this consumer buffers response content in memory and should be used for
47   * relatively small response messages.
48   *
49   * @since 4.2
50   */
51  @ThreadSafe
52  public class BasicAsyncResponseConsumer extends AbstractAsyncResponseConsumer<HttpResponse> {
53  
54      private volatile HttpResponse response;
55      private volatile SimpleInputBuffer buf;
56  
57      public BasicAsyncResponseConsumer() {
58          super();
59      }
60  
61      @Override
62      protected void onResponseReceived(final HttpResponse response) throws IOException {
63          this.response = response;
64      }
65  
66      @Override
67      protected void onEntityEnclosed(
68              final HttpEntity entity, final ContentType contentType) throws IOException {
69          long len = entity.getContentLength();
70          if (len > Integer.MAX_VALUE) {
71              throw new ContentTooLongException("Entity content is too long: " + len);
72          }
73          if (len < 0) {
74              len = 4096;
75          }
76          this.buf = new SimpleInputBuffer((int) len, new HeapByteBufferAllocator());
77          this.response.setEntity(new ContentBufferEntity(entity, this.buf));
78      }
79  
80      @Override
81      protected void onContentReceived(
82              final ContentDecoder decoder, final IOControl ioctrl) throws IOException {
83          Asserts.notNull(this.buf, "Content buffer");
84          this.buf.consumeContent(decoder);
85      }
86  
87      @Override
88      protected void releaseResources() {
89          this.response = null;
90          this.buf = null;
91      }
92  
93      @Override
94      protected HttpResponse buildResult(final HttpContext context) {
95          return this.response;
96      }
97  
98  }