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
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<!-- Content Stylesheet for Site -->
<!-- start the processing -->
<!-- ====================================================================== -->
<!-- Main Page Section -->
<!-- ====================================================================== -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/>
<meta name="author" value="Jason van Zyl">
<meta name="email" value="jvanzyl@apache.org">
<title>Turbine - Turbine Services</title>
</head>
<body bgcolor="#ffffff" text="#000000" link="#525D76">
<table border="0" width="100%" cellspacing="0">
<!-- TOP IMAGE -->
<tr>
<td align="left">
<a href="http://jakarta.apache.org"><img src="http://jakarta.apache.org/images/jakarta-logo.gif" border="0"/></a>
</td>
<td align="right">
<a href="http://jakarta.apache.org/turbine/"><img src="../images/logo.gif" alt="Turbine" border="0"/></a>
</td>
</tr>
</table>
<table border="0" width="100%" cellspacing="4">
<tr><td colspan="2">
<hr noshade="" size="1"/>
</td></tr>
<tr>
<!-- LEFT SIDE NAVIGATION -->
<td valign="top" nowrap="true">
<p><strong>Essentials</strong></p>
<ul>
<li> <a href="../index.html">Overview</a>
</li>
<li> <a href="../features.html">Features</a>
</li>
<li> <a href="../fsd.html">Specification</a>
</li>
<li> <a href="../project-map.html">Project map</a>
</li>
<li> <a href="../install.html">Installation</a>
</li>
<li> <a href="../getting-started.html">Getting Started</a>
</li>
<li> <a href="../changes.html">Changes</a>
</li>
<li> <a href="../other-docs.html">Other Documentation</a>
</li>
</ul>
<p><strong>Models</strong></p>
<ul>
<li> <a href="../pullmodel.html">Pull MVC Model</a>
</li>
<li> <a href="../model2+1.html">Model 2+1</a>
</li>
<li> <a href="../j2ee-integration.html">J2EE Integration</a>
</li>
</ul>
<p><strong>Get Involved</strong></p>
<ul>
<li> <a href="../turbine-documentation-project.html">Turbine Documentation</a>
</li>
<li> <a href="../code-standards.html">Coding Spec</a>
</li>
<li> <a href="../contributors.html">Contributors</a>
</li>
<li> <a href="../branches.html">CVS Branches</a>
</li>
<li> <a href="http://jakarta.apache.org/site/cvsindex.html">CVS Repos</a>
</li>
<li> <a href="../faq.html">FAQ</a>
</li>
<li> <a href="../license.html">License</a>
</li>
<li> <a href="http://jakarta.apache.org/site/mail.html">Mailing Lists</a>
</li>
<li> <a href="../powered.html">Powered by Turbine</a>
</li>
<li> <a href="../todo.html">Todo</a>
</li>
<li> <a href="../active-developers.html">Active Developers</a>
</li>
<li> <a href="../proposals.html">Proposals</a>
</li>
</ul>
<p><strong>Documentation</strong></p>
<ul>
<li> <a href="../action-event.html">Action Events</a>
</li>
<li> <a href="../services.html">Services</a>
</li>
<li> <a href="../security.html">Turbine and Security</a>
</li>
<li> <a href="../python.html">Turbine and Python</a>
</li>
<li> <a href="../jsp-configuration.html">Turbine and JSP</a>
</li>
<li> <a href="../velocity-site.html">Velocity Site</a>
</li>
<li> <a href="../context-howto.html">Velocity Context</a>
</li>
<li> <a href="../webmacro-site.html">Webmacro Site</a>
</li>
</ul>
<p><strong>Database</strong></p>
<ul>
<li> <a href="../peers.html">Peers</a>
</li>
<li> <a href="../advpeers.html">Advanced Peers</a>
</li>
<li> <a href="../advcriteria.html">Advanced Criteria</a>
</li>
<li> <a href="../torque.html">Torque</a>
</li>
<li> <a href="../turbine-schema.html">Core Schema</a>
</li>
<li> <a href="../db-adapters.html">DB Adapters</a>
</li>
<li> <a href="../postgres-howto.html">Postgres Howto</a>
</li>
<li> <a href="../oracle-howto.html">Oracle 8i Howto</a>
</li>
<li> <a href="../sybase-howto.html">Sybase Howto</a>
</li>
</ul>
</td>
<td align="left" valign="top">
<table border="0" cellspacing="0" cellpadding="2" width="100%">
<tr><td bgcolor="#525D76">
<font color="#ffffff" face="arial,helvetica,sanserif">
<a name="Cache Service"><strong>Cache Service</strong></a>
</font>
</td></tr>
<tr><td>
<blockquote>
<p>
The Global Cache Service provides an object cache that you can call
from anywhere in your application to temporarily store objects. An example
of its use may be to store the names of Countries that you use throughout
your application to populate a look up list. If you normally store the
information about Countries in a database, you can increase the performance
of your application by using the Cache and decreasing the number of hits
against the database.
</p>
</blockquote>
</td></tr>
</table>
<table border="0" cellspacing="0" cellpadding="2" width="100%">
<tr><td bgcolor="#525D76">
<font color="#ffffff" face="arial,helvetica,sanserif">
<a name="Configuration"><strong>Configuration</strong></a>
</font>
</td></tr>
<tr><td>
<blockquote>
<div align="left">
<table cellspacing="4" cellpadding="0" border="0">
<tr>
<td bgcolor="#023264" width="1" height="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
<td bgcolor="#023264" height="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
<td bgcolor="#023264" width="1" height="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
</tr>
<tr>
<td bgcolor="#023264" width="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
<td bgcolor="#ffffff"><pre>
# -------------------------------------------------------------------
#
# S E R V I C E S
#
# -------------------------------------------------------------------
# Classes for Turbine Services should be defined here.
# Format: services.[name].classname=[implementing class]
#
# To specify properties of a service use the following syntax:
# service.[name].[property]=[value]
services.GlobalCacheService.classname=org.apache.turbine.services.cache.TurbineGlobalCacheService
.
.
.
# -------------------------------------------------------------------
#
# C A C H E S E R V I C E
#
# -------------------------------------------------------------------
# Interval at which the cache will be checked. The default is
# 5000ms or 5 seconds.
services.GlobalCacheService.cache.check.frequency = 5000
</pre></td>
<td bgcolor="#023264" width="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
</tr>
<tr>
<td bgcolor="#023264" width="1" height="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
<td bgcolor="#023264" height="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
<td bgcolor="#023264" width="1" height="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
</tr>
</table>
</div>
</blockquote>
</td></tr>
</table>
<table border="0" cellspacing="0" cellpadding="2" width="100%">
<tr><td bgcolor="#525D76">
<font color="#ffffff" face="arial,helvetica,sanserif">
<a name="Usage"><strong>Usage</strong></a>
</font>
</td></tr>
<tr><td>
<blockquote>
<div align="left">
<table cellspacing="4" cellpadding="0" border="0">
<tr>
<td bgcolor="#023264" width="1" height="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
<td bgcolor="#023264" height="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
<td bgcolor="#023264" width="1" height="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
</tr>
<tr>
<td bgcolor="#023264" width="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
<td bgcolor="#ffffff"><pre>
GlobalCacheService gs = null;
try
{
/*
* Look for the item in the cache.
* If it doesn't exist or the item is stale,
* the cache will throw an exception.
*/
gs = (GlobalCacheService)TurbineServices.getInstance()
.getService(GlobalCacheService.SERVICE_NAME);
CachedObject obj = gs.getObject("cached_object");
data.setMessage( data.getScreen() + " Got " +
obj.getContents().toString() + " from global cache!" );
}
catch(ObjectExpiredException gone)
{
/*
* Add the item to the cache.
*/
gs.addObject("cached_object",
new CachedObject("in_the_cache",5000));
data.setMessage( data.getScreen() +
" Refreshed/or added new item to" +
" the cache! Expires in 5 seconds" );
}
</pre></td>
<td bgcolor="#023264" width="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
</tr>
<tr>
<td bgcolor="#023264" width="1" height="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
<td bgcolor="#023264" height="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
<td bgcolor="#023264" width="1" height="1"><img src="/images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"/></td>
</tr>
</table>
</div>
<p>
You can also place an expiration time on your objects so the Service will
automatically remove them when they expire. If you don't specify an expiration
time, the Service uses the default time set by the property
<em>cache.check.frequency</em> in the TurbineResources.properties
file. To see an example, look at the file <strong>TestGlobalCache.java</strong>
located in the actions folder.
</p>
</blockquote>
</td></tr>
</table>
</td>
</tr>
<!-- FOOTER -->
<tr><td colspan="2">
<hr noshade="" size="1"/>
</td></tr>
<tr><td colspan="2">
<div align="center"><font color="#525D76" size="-1"><em>
Copyright © 1999-2001, Apache Software Foundation
</em></font></div>
</td></tr>
</table>
</body>
</html>
<!-- end the processing -->
|
