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
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
/*
* Copyright (c) 2006-2008, 2011, 2012 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.signal;
import org.eclipse.net4j.buffer.BufferInputStream;
import org.eclipse.net4j.buffer.BufferOutputStream;
import org.eclipse.net4j.util.StringUtil;
import org.eclipse.net4j.util.io.ExtendedDataInputStream;
import org.eclipse.net4j.util.io.ExtendedDataOutputStream;
/**
* Represents the receiver side of a two-way {@link SignalReactor signal}, i.e., one with a response.
*
* @author Eike Stepper
*/
public abstract class IndicationWithResponse extends SignalReactor
{
/**
* @since 2.0
*/
public IndicationWithResponse(SignalProtocol<?> protocol, short id, String name)
{
super(protocol, id, name);
}
/**
* @since 2.0
*/
public IndicationWithResponse(SignalProtocol<?> protocol, short signalID)
{
super(protocol, signalID);
}
/**
* @since 2.0
*/
public IndicationWithResponse(SignalProtocol<?> protocol, Enum<?> literal)
{
super(protocol, literal);
}
/**
* @since 2.0
*/
protected String getExceptionMessage(Throwable t)
{
return StringUtil.formatException(t);
}
@Override
protected void execute(BufferInputStream in, BufferOutputStream out) throws Exception
{
boolean responding = false;
try
{
doInput(in);
responding = true;
doOutput(out);
}
catch (Error ex)
{
sendExceptionSignal(ex, responding);
throw ex;
}
catch (Exception ex)
{
sendExceptionSignal(ex, responding);
throw ex;
}
}
protected abstract void indicating(ExtendedDataInputStream in) throws Exception;
/**
* <b>Important Note:</b> The response must not be empty, i.e. the stream must be used at least to write a
* <code>boolean</code>. Otherwise synchronization problems will result!
*/
protected abstract void responding(ExtendedDataOutputStream out) throws Exception;
@Override
void doExtendedInput(ExtendedDataInputStream in) throws Exception
{
indicating(in);
}
@Override
void doExtendedOutput(ExtendedDataOutputStream out) throws Exception
{
responding(out);
}
void sendExceptionSignal(Throwable t, boolean responding) throws Exception
{
SignalProtocol<?> protocol = getProtocol();
int correlationID = -getCorrelationID();
String message = getExceptionMessage(t);
new RemoteExceptionRequest(protocol, correlationID, responding, message, t).sendAsync();
}
}
|
