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
40 /**
41 * Basic implementation of {@link HttpAsyncContentProducer} that relies on
42 * inefficient and potentially blocking I/O operation redirection through
43 * {@link Channels#newChannel(java.io.InputStream)}.
44 *
45 * @since 4.2
46 */
47 @NotThreadSafe
48 public class EntityAsyncContentProducer implements HttpAsyncContentProducer {
49
50 private final HttpEntity entity;
51 private final ByteBuffer buffer;
52 private ReadableByteChannel channel;
53
54 public EntityAsyncContentProducer(final HttpEntity entity) {
55 super();
56 if (entity == null) {
57 throw new IllegalArgumentException("HTTP entity may not be null");
58 }
59 this.entity = entity;
60 this.buffer = ByteBuffer.allocate(4096);
61 }
62
63 public void produceContent(
64 final ContentEncoder encoder, final IOControl ioctrl) throws IOException {
65 if (this.channel == null) {
66 this.channel = Channels.newChannel(this.entity.getContent());
67 }
68 int i = this.channel.read(this.buffer);
69 this.buffer.flip();
70 encoder.write(this.buffer);
71 boolean buffering = this.buffer.hasRemaining();
72 this.buffer.compact();
73 if (i == -1 && !buffering) {
74 encoder.complete();
75 close();
76 }
77 }
78
79 public boolean isRepeatable() {
80 return this.entity.isRepeatable();
81 }
82
83 public void close() throws IOException {
84 ReadableByteChannel local = this.channel;
85 this.channel = null;
86 if (local != null) {
87 local.close();
88 }
89 }
90
91 }