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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* The Contents of this file are made available subject to the terms of
* the BSD license.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
* 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.
* 3. Neither the name of Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE
* COPYRIGHT OWNER 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.
*
*************************************************************************/
// __________ Imports __________
import java.util.*;
// __________ Implementation __________
/**
* It's implement a static container which hold
* all opened documents and her views alive.
* It's possible to register/deregister such views,
* to get information about these and it provides
* some global functionality - like termination of
* this demo application.
*
*/
public class ViewContainer extends Thread
{
/**
* provides a singleton view container
* Necessary for terminate(9 functionality to be able
* to call Runtime.runFinilization().
*
* @return a reference to the singleton ViewContainer instance
*/
public static synchronized ViewContainer getGlobalContainer()
{
if (maSingleton==null)
maSingleton=new ViewContainer();
return maSingleton;
}
/**
* ctor
* It's private - because nobody should create any instance
* expect the only global one, which will be created by ourself!
*/
private ViewContainer()
{
mlViews = new ArrayList<Object>();
mlListener = new ArrayList<IShutdownListener>();
mbShutdownActive = false ;
Runtime.getRuntime().addShutdownHook(this);
}
/**
* This register a new view inside this global container
* (if it doesn't already exist).
*
* @param aView view which wishes to be registered inside this container
*/
public void addView(Object aView)
{
synchronized(mlViews)
{
if(!mlViews.contains(aView))
mlViews.add(aView);
}
}
/**
* This deregister a view from this global container.
* Normally it should be the last reference to the view
* and her finalize() method should be called.
* If last view will be closed here - we terminate these
* java application too. Because there is no further
* visible frame anymore.
*
* @param aView
* view object which wishes to be deregistered
*/
public void removeView(Object aView)
{
int nViewCount = 0;
synchronized(mlViews)
{
if(mlViews.contains(aView))
mlViews.remove(aView);
nViewCount = mlViews.size();
if (nViewCount<1)
mlViews = null;
}
// If this view is a registered shutdown listener on this view container
// too, we must call his interface and forget him as possible listener.
// It's necessary to guarantee his dead ...
boolean bShutdownView = false;
synchronized(mlListener)
{
bShutdownView = mlListener.contains(aView);
if (bShutdownView)
mlListener.remove(aView);
}
if (bShutdownView)
((IShutdownListener)aView).shutdown();
// We use a system.exit() to finish the whole application.
// And further we have registered THIS instance as a possible shutdown
// hook at the runtime class. So our run() method will be called.
// Our view container should be empty - but
// our listener container can include some references.
// These objects will be informed then and release e.g. some
// remote references.
if (nViewCount<1)
{
boolean bNecessary = false;
synchronized(this)
{
bNecessary = ! mbShutdownActive;
}
if (bNecessary)
{
System.out.println("call exit(0)!");
System.exit(0);
}
}
}
/**
* add/remove listener for possible shutdown events
*/
public void addListener( IShutdownListener rListener )
{
synchronized(mlListener)
{
if ( ! mlListener.contains(rListener) )
mlListener.add(rListener);
}
}
private void removeListener( IShutdownListener rListener )
{
synchronized(mlListener)
{
if ( mlListener.contains(rListener) )
mlListener.remove(rListener);
}
}
/**
* Is called from current runtime system of the java machine
* on shutdown. We inform all current registered listener and
* views. They should deinitialize her internal things then.
*/
@Override
public void run()
{
synchronized(this)
{
if (mbShutdownActive)
return;
mbShutdownActive=true;
}
while( true )
{
IShutdownListener aListener = null;
synchronized(mlListener)
{
if (!mlListener.isEmpty())
aListener = mlListener.get(0);
}
if (aListener==null)
break;
aListener.shutdown();
// May this listener has deregistered himself.
// But if not we must do it for him. Our own
// method "removeListener()" ignore requests for
// already gone listener objects.
removeListener(aListener);
}
if (mlViews!=null)
{
synchronized(mlViews)
{
mlViews.clear();
mlViews = null;
}
}
if (mlListener!=null)
{
synchronized(mlListener)
{
mlListener.clear();
mlListener = null;
}
}
}
/**
* @member mbInplace indicates using of inplace office frames instead of outplace ones
* @member maSingleton singleton instance of this view container
* @member mlViews list of all currently registered document views
* @member mlListener list of all currently registered shutdown listener
* @member mbShutdownActive if this shutdown hook already was started it's not a good idea to
* call System.exit() again for other conditions.
* We suppress it by using this variable!
*/
public static boolean mbInplace = false ;
private static ViewContainer maSingleton = null ;
private ArrayList<Object> mlViews ;
private ArrayList<IShutdownListener> mlListener ;
private boolean mbShutdownActive ;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
