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
28 package org.apache.http.nio.entity;
29
30 import java.io.IOException;
31 import java.nio.ByteBuffer;
32 import java.nio.channels.Channels;
33 import java.nio.channels.ReadableByteChannel;
34
35 import org.apache.http.HttpEntity;
36 import org.apache.http.annotation.NotThreadSafe;
37 import org.apache.http.nio.ContentEncoder;
38 import org.apache.http.nio.IOControl;
39 import org.apache.http.util.Args;
40
41 /**
42 * Basic implementation of {@link HttpAsyncContentProducer} that relies on
43 * inefficient and potentially blocking I/O operation redirection through
44 * {@link Channels#newChannel(java.io.InputStream)}.
45 *
46 * @since 4.2
47 */
48 @NotThreadSafe
49 public class EntityAsyncContentProducer implements HttpAsyncContentProducer {
50
51 private final HttpEntity entity;
52 private final ByteBuffer buffer;
53 private ReadableByteChannel channel;
54
55 public EntityAsyncContentProducer(final HttpEntity entity) {
56 super();
57 Args.notNull(entity, "HTTP entity");
58 this.entity = entity;
59 this.buffer = ByteBuffer.allocate(4096);
60 }
61
62 public void produceContent(
63 final ContentEncoder encoder, final IOControl ioctrl) throws IOException {
64 if (this.channel == null) {
65 this.channel = Channels.newChannel(this.entity.getContent());
66 }
67 final int i = this.channel.read(this.buffer);
68 this.buffer.flip();
69 encoder.write(this.buffer);
70 final boolean buffering = this.buffer.hasRemaining();
71 this.buffer.compact();
72 if (i == -1 && !buffering) {
73 encoder.complete();
74 close();
75 }
76 }
77
78 public boolean isRepeatable() {
79 return this.entity.isRepeatable();
80 }
81
82 public void close() throws IOException {
83 final ReadableByteChannel local = this.channel;
84 this.channel = null;
85 if (local != null) {
86 local.close();
87 }
88 }
89
90 }