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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/**
* Copyright 2013 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package com.jogamp.common.util;
import java.io.PrintStream;
/**
* Helper class to provide a Runnable queue implementation with a Runnable wrapper
* which notifies after execution for the <code>invokeAndWait()</code> semantics.
*/
public class FunctionTask<R,A> extends TaskBase implements Function<R,A> {
protected Function<R,A> runnable;
protected R result;
protected A[] args;
/**
* Invokes <code>func</code>.
* @param waitUntilDone if <code>true</code>, waits until <code>func</code> execution is completed, otherwise returns immediately.
* @param func the {@link Function} to execute.
* @param args the {@link Function} arguments
* @return the {@link Function} return value
*/
public static <U,V> U invoke(boolean waitUntilDone, Function<U,V> func, V... args) {
Throwable throwable = null;
final Object sync = new Object();
final FunctionTask<U,V> rt = new FunctionTask<U,V>( func, waitUntilDone ? sync : null, true, waitUntilDone ? null : System.err );
final U res;
synchronized(sync) {
res = rt.eval(args);
if( waitUntilDone ) {
try {
sync.wait();
} catch (InterruptedException ie) {
throwable = ie;
}
if(null==throwable) {
throwable = rt.getThrowable();
}
if(null!=throwable) {
throw new RuntimeException(throwable);
}
}
}
return res;
}
/**
* Create a RunnableTask object w/ synchronization,
* ie. suitable for <code>invokeAndWait()</code>.
*
* @param runnable the user action
* @param syncObject the synchronization object the caller shall wait until <code>runnable</code> execution is completed,
* or <code>null</code> if waiting is not desired.
* @param catchExceptions Influence an occurring exception during <code>runnable</code> execution.
* If <code>true</code>, the exception is silenced and can be retrieved via {@link #getThrowable()},
* otherwise the exception is thrown.
* @param exceptionOut If not <code>null</code>, exceptions are written to this {@link PrintStream}.
*/
public FunctionTask(Function<R,A> runnable, Object syncObject, boolean catchExceptions, PrintStream exceptionOut) {
super(syncObject, catchExceptions, exceptionOut);
this.runnable = runnable ;
result = null;
args = null;
}
/** Return the user action */
public final Function<R,A> getRunnable() {
return runnable;
}
/**
* Sets the arguments for {@link #run()}.
* They will be cleared after calling {@link #run()} or {@link #eval(Object...)}.
*/
public final void setArgs(A... args) {
this.args = args;
}
/**
* Retrieves the cached result of {@link #run()}
* and is cleared within this method.
*/
public final R getResult() {
final R res = result;
result = null;
return res;
}
/**
* {@inheritDoc}
* <p>
* Calls {@link #eval(Object...)}.
* </p>
* <p>
* You may set the {@link #eval(Object...)} arguments via {@link #setArgs(Object...)}
* and retrieve the result via {@link #getResult()}.
* </p>
*/
@Override
public final void run() {
final A[] args = this.args;
this.args = null;
this.result = null;
tStarted = System.currentTimeMillis();
if(null == syncObject) {
try {
this.result = runnable.eval(args);
} catch (Throwable t) {
runnableException = t;
if(null != exceptionOut) {
t.printStackTrace(exceptionOut);
}
if(!catchExceptions) {
throw new RuntimeException(runnableException);
}
} finally {
tExecuted = System.currentTimeMillis();
}
} else {
synchronized (syncObject) {
try {
this.result = runnable.eval(args);
} catch (Throwable t) {
runnableException = t;
if(null != exceptionOut) {
t.printStackTrace(exceptionOut);
}
if(!catchExceptions) {
throw new RuntimeException(runnableException);
}
} finally {
tExecuted = System.currentTimeMillis();
syncObject.notifyAll();
}
}
}
}
@Override
public final R eval(A... args) {
this.args = args;
run();
final R res = result;
result = null;
return res;
}
}
|
