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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.HttpEntityEnclosingRequest;
34  import org.apache.http.HttpRequest;
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 HttpAsyncRequestConsumer}. Please note that
46   * this consumer buffers request content in memory and should be used for
47   * relatively small request messages.
48   *
49   * @since 4.2
50   */
51  public class BasicAsyncRequestConsumer extends AbstractAsyncRequestConsumer<HttpRequest> {
52  
53      private static final int MAX_INITIAL_BUFFER_SIZE = 256 * 1024;
54  
55      private volatile HttpRequest request;
56      private volatile SimpleInputBuffer buf;
57  
58      public BasicAsyncRequestConsumer() {
59          super();
60      }
61  
62      @Override
63      protected void onRequestReceived(final HttpRequest request) throws IOException {
64          this.request = request;
65      }
66  
67      @Override
68      protected void onEntityEnclosed(
69              final HttpEntity entity, final ContentType contentType) throws IOException {
70          long len = entity.getContentLength();
71          if (len > Integer.MAX_VALUE) {
72              throw new ContentTooLongException("Entity content is too long: " + len);
73          }
74          if (len < 0) {
75              len = 4096;
76          }
77          final int initialBufferSize = Math.min((int) len, MAX_INITIAL_BUFFER_SIZE);
78          this.buf = new SimpleInputBuffer(initialBufferSize, new HeapByteBufferAllocator());
79          ((HttpEntityEnclosingRequest) this.request).setEntity(
80                  new ContentBufferEntity(entity, this.buf));
81      }
82  
83      @Override
84      protected void onContentReceived(
85              final ContentDecoder decoder, final IOControl ioctrl) throws IOException {
86          Asserts.notNull(this.buf, "Content buffer");
87          this.buf.consumeContent(decoder);
88      }
89  
90      @Override
91      protected void releaseResources() {
92          this.request = null;
93          this.buf = null;
94      }
95  
96      @Override
97      protected HttpRequest buildResult(final HttpContext context) {
98          return this.request;
99      }
100 
101 }