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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.annotation.ThreadSafe;
36  import org.apache.http.entity.ContentType;
37  import org.apache.http.nio.ContentDecoder;
38  import org.apache.http.nio.IOControl;
39  import org.apache.http.nio.entity.ContentBufferEntity;
40  import org.apache.http.nio.util.HeapByteBufferAllocator;
41  import org.apache.http.nio.util.SimpleInputBuffer;
42  import org.apache.http.protocol.HttpContext;
43  import org.apache.http.util.Asserts;
44  
45  /**
46   * Basic implementation of {@link HttpAsyncRequestConsumer}. Please note that
47   * this consumer buffers request content in memory and should be used for
48   * relatively small request messages.
49   *
50   * @since 4.2
51   */
52  @ThreadSafe
53  public class BasicAsyncRequestConsumer extends AbstractAsyncRequestConsumer<HttpRequest> {
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          this.buf = new SimpleInputBuffer((int) len, new HeapByteBufferAllocator());
78          ((HttpEntityEnclosingRequest) this.request).setEntity(
79                  new ContentBufferEntity(entity, this.buf));
80      }
81  
82      @Override
83      protected void onContentReceived(
84              final ContentDecoder decoder, final IOControl ioctrl) throws IOException {
85          Asserts.notNull(this.buf, "Content buffer");
86          this.buf.consumeContent(decoder);
87      }
88  
89      @Override
90      protected void releaseResources() {
91          this.request = null;
92          this.buf = null;
93      }
94  
95      @Override
96      protected HttpRequest buildResult(final HttpContext context) {
97          return this.request;
98      }
99  
100 }