1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
/*
* ContinueDispatcher.java February 2007
*
* Copyright (C) 2007, Niall Gallagher <niallg@users.sf.net>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package org.simpleframework.http.message;
import static org.simpleframework.http.core.ContainerEvent.DISPATCH_CONTINUE;
import java.io.IOException;
import org.simpleframework.transport.Channel;
import org.simpleframework.transport.ByteWriter;
import org.simpleframework.transport.trace.Trace;
/**
* The <code>ContinueDispatcher</code> object is used to send the HTTP
* 100 continue status if required. This is delivered to the client
* to tell the client that the server is willing to accept the request
* body. Once this is sent the transport will likely wait until there
* is a read ready event.
*
* @author Niall Gallagher
*/
class ContinueDispatcher {
/**
* This is the status code that is sent to prompt the client.
*/
private static final byte[] STATUS = { 'H', 'T','T', 'P', '/','1','.', '1',' ', '1','0','0',' '};
/**
* This is the optional description for the expect status code.
*/
private static final byte[] MESSAGE = {'C','o','n','t','i','n','u','e', '\r','\n','\r','\n'};
/**
* This is the writer that is used to deliver the continue.
*/
private final ByteWriter writer;
/**
* This is the trace used to capture a continue response if any.
*/
private final Trace trace;
/**
* Constructor for the <code>ContinueDispatcher</code> object. This
* will create an object that will deliver the continue status code.
* Because the transport performs an asynchronous write this will
* not block the execution of this method and delay execution.
*
* @param channel this is the channel used to deliver the prompt
*/
public ContinueDispatcher(Channel channel) {
this.writer = channel.getWriter();
this.trace = channel.getTrace();
}
/**
* This will execute the continue if the header contains the
* expectation header. If there is no expectation then this will
* return without sending anything back to the connected client.
*
* @param header this is the header read from the channel
*/
public void execute(Header header) throws IOException {
if(header.isExpectContinue()) {
trace.trace(DISPATCH_CONTINUE);
writer.write(STATUS);
writer.write(MESSAGE);
writer.flush();
}
}
}
|
