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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  
43  /**
44   * Basic implementation of {@link HttpAsyncResponseConsumer}. Please note that
45   * this consumer buffers response content in memory and should be used for
46   * relatively small response messages.
47   *
48   * @since 4.2
49   */
50  @ThreadSafe
51  public class BasicAsyncResponseConsumer extends AbstractAsyncResponseConsumer<HttpResponse> {
52  
53      private volatile HttpResponse response;
54      private volatile SimpleInputBuffer buf;
55  
56      public BasicAsyncResponseConsumer() {
57          super();
58      }
59  
60      @Override
61      protected void onResponseReceived(final HttpResponse response) throws IOException {
62          this.response = response;
63      }
64  
65      @Override
66      protected void onEntityEnclosed(
67              final HttpEntity entity, final ContentType contentType) throws IOException {
68          long len = entity.getContentLength();
69          if (len > Integer.MAX_VALUE) {
70              throw new ContentTooLongException("Entity content is too long: " + len);
71          }
72          if (len < 0) {
73              len = 4096;
74          }
75          this.buf = new SimpleInputBuffer((int) len, new HeapByteBufferAllocator());
76          this.response.setEntity(new ContentBufferEntity(entity, this.buf));
77      }
78  
79      @Override
80      protected void onContentReceived(
81              final ContentDecoder decoder, final IOControl ioctrl) throws IOException {
82          if (this.buf == null) {
83              throw new IllegalStateException("Content buffer is null");
84          }
85          this.buf.consumeContent(decoder);
86      }
87  
88      @Override
89      protected void releaseResources() {
90          this.response = null;
91          this.buf = null;
92      }
93  
94      @Override
95      protected HttpResponse buildResult(final HttpContext context) {
96          return this.response;
97      }
98  
99  }