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Clement Escoffier3575f072008-06-06 12:12:01 +0000[diff] [blame]5
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]6 <title>Apache Felix - Temporal Service Dependency</title>
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Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]184<h1><a name="TemporalServiceDependency-Thetemporaldependencyhandler"></a>The temporal dependency handler</h1>
Clement Escoffier130ca572008-10-13 07:33:03 +0000[diff] [blame]185
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]186<p><em>Regular service dependencies participate to the instance
187lifecycle. Moreover, the injected service object is either available or
188not available. A temporal dependency handler is a little different and
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]189provides a different resolution pattern. Indeed, the temporal
190dependency does not invalidate the instance. Moreover, if not
191available, the temporal dependency waits (and so blocks the current
192thread) for a provider. Of course, the maximum waiting time can be
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]193specified. If a timeout occurs, the handler throws a runtime exception.</em></p>
194
195<div class="toc">
196<ul>
197 <li><a href="#TemporalServiceDependency-Usingthehandler">Using the handler</a></li>
198 <li><a href="#TemporalServiceDependency-Collectioninjection">Collection injection</a></li>
199 <li><a href="#TemporalServiceDependency-Proxyinjection">Proxy injection</a></li>
200 <li><a href="#TemporalServiceDependency-Download">Download</a></li>
201</ul></div>
202
203<h2><a name="TemporalServiceDependency-Usingthehandler"></a>Using the handler</h2>
Clement Escoffier130ca572008-10-13 07:33:03 +0000[diff] [blame]204
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]205<p>First of all, you need to configure the component type to use the handler such as:</p>
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]206<div class="code">
207<div class="dp-highlighter"><table class="dp-xml" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="tag">&lt;</span><span>iPOJO&nbsp;xmlns:</span><span class="attribute">temporal</span><span>=</span><span class="attribute-value">"org.apache.felix.ipojo.handler.temporal"</span><span>&gt;&nbsp;</span></td></tr><tr><td class="line2"><span class="tag">&lt;</span><span>component&nbsp;</span></td></tr><tr><td class="line1">&nbsp;&nbsp;&nbsp;&nbsp;<span class="attribute">className</span><span>=</span><span class="attribute-value">"org.apache.felix.ipojo.example.Temporal"</span><span>&gt;&nbsp;</span></td></tr><tr><td class="line2">&nbsp;</td></tr><tr><td class="line1">&nbsp;&nbsp;&nbsp;&nbsp;<span class="comments">&lt;!--&nbsp;Temporal&nbsp;dependency&nbsp;configuration&nbsp;--&gt;</span><span>&nbsp;</span></td></tr><tr><td class="line2">&nbsp;&nbsp;&nbsp;&nbsp;<span class="tag">&lt;</span><span>temporal:requires&nbsp;</span><span class="attribute">field</span><span>=</span><span class="attribute-value">"mytemporal"</span><span>/&gt;&nbsp;</span></td></tr><tr><td class="line1">&nbsp;</td></tr><tr><td class="line2">&nbsp;&nbsp;&nbsp;&nbsp;<span class="tag">&lt;</span><span>provides</span><span class="tag">/&gt;</span><span>&nbsp;</span></td></tr><tr><td class="line1">&nbsp;</td></tr><tr><td class="line2"><span class="tag">&lt;/</span><span>component</span><span class="tag">&gt;</span><span>&nbsp;</span></td></tr><tr><td class="line1"><span class="tag">&lt;/</span><span>iPOJO</span><span class="tag">&gt;</span><span>&nbsp;</span></td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="xml:nocontrols:nogutter" rows="10" readonly="readonly">&lt;iPOJO xmlns:temporal="org.apache.felix.ipojo.handler.temporal"&gt;
Clement Escoffier130ca572008-10-13 07:33:03 +0000[diff] [blame]208&lt;component
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]209 className="org.apache.felix.ipojo.example.Temporal"&gt;
Clement Escoffier130ca572008-10-13 07:33:03 +0000[diff] [blame]210
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]211 &lt;!-- Temporal dependency configuration --&gt;
212 &lt;temporal:requires field="mytemporal"/&gt;
Clement Escoffier130ca572008-10-13 07:33:03 +0000[diff] [blame]213
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]214 &lt;provides/&gt;
Clement Escoffier130ca572008-10-13 07:33:03 +0000[diff] [blame]215
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]216&lt;/component&gt;
217&lt;/iPOJO&gt;</textarea>
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234
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]235<p>Notice that, this handler is an external handler. So, it uses the "org.apache.felix.ipojo.handler.temporal" namespace.<br>
236Once described, you can implement your component. The specified field
237will be mapped to the temporal dependency. As for regular field
238injection, aggregation, targeted service specification (i.e. interface)
239is discovered automatically. Filter, comparator and binding policy are
240also supported. However, the optional attribute is not supported. In
241fact, this attribute is meaningless in the case of a temporal
242dependency.<br>
243Using the field in your code will try to find a matching service
244provider. If a provider is available, the field receives the service
245object immediately. Else, the thread is stopped and waits for a
246provider. The default wait time is 3s (you can also specify this time).
247If no provider is available after this time, the thread throws a
248RuntimeException. If a provider becomes available during this time, the
249field receives immediately the value and the execution can continue.<br>
250Configuration</p>
Clement Escoffier130ca572008-10-13 07:33:03 +0000[diff] [blame]251
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]252<p>The handler has only one mandatory attributes:</p>
253<ul>
254 <li>Field: the implementation field supporting the dependency</li>
255</ul>
Clement Escoffier3575f072008-06-06 12:12:01 +0000[diff] [blame]256
257
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]258<p>The handler supports on specific optional attributes:</p>
259<ul>
260 <li>Timeout: the maximum time waited in order to find a provider
261(default: 3s). For an infinite timeout, the timeout value is either
262"infinite" or "-1".</li>
263 <li>OnTimeout: specifies the action to do
264when the timeout occurs. Four actions are supported: null, nullable,
265empty-array, default-implementation. By default, no action is
266specified, and an exception occurs when the timeout is reached.</li>
267</ul>
Clement Escoffier3575f072008-06-06 12:12:01 +0000[diff] [blame]268
269
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]270<p>The attributes from "regular" dependencies are also supported (like filter).<br>
271OnTimeout actions</p>
Clement Escoffier130ca572008-10-13 07:33:03 +0000[diff] [blame]272
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]273<p>When a timeout occurs, you can specify what the handler must do. By
274default, it throws a runtime exception. However, four others actions
275can be set in the 'onTimeout' attribute.</p>
276<ul>
277 <li>The null action (onTimeout="null") will return "null" instead of the service object.</li>
278 <li>The
279"nullable" action (onTimeout="nullable") will return a "Nullable"
280object instead of the service object. This object is a fake but can be
281used a regular service object. However, invoking actions on this object
282will do nothing. In the case of aggregate dependency, an array
283containing a "nullable" object is returned.</li>
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]284 <li>The empty action
285is only supported for aggregate dependency (the field must be an
286array). In this case, an empty-array is returned. (In the 1.2.0
287version, the <tt>empty-array</tt> attribute became <tt>empty</tt>)</li>
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]288 <li>The
289default-implementation action is a little different. Instead of
290specifying the action, you need to specify the default-implementation
291(the qualified class name) that you want to use. For example
292onTimeout="o.a.f.i.MyDefaultLogServiceImpl". In this case, the handler
293will inject an instance of this object instead of a real service
294object. On aggregate dependency, an array with one
295default-implementation object is returned.</li>
296</ul>
Clement Escoffier130ca572008-10-13 07:33:03 +0000[diff] [blame]297
298
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]299<div class="code">
300<div class="dp-highlighter"><table class="dp-xml" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="tag">&lt;</span><span>iPOJO&nbsp;xmlns:</span><span class="attribute">temporal</span><span>=</span><span class="attribute-value">"org.apache.felix.ipojo.handler.temporal"</span><span>&gt;&nbsp;</span></td></tr><tr><td class="line2"><span class="tag">&lt;</span><span>component&nbsp;</span></td></tr><tr><td class="line1">&nbsp;&nbsp;&nbsp;&nbsp;<span class="attribute">className</span><span>=</span><span class="attribute-value">"org.apache.felix.ipojo.example.Temporal"</span><span>&gt;&nbsp;</span></td></tr><tr><td class="line2">&nbsp;</td></tr><tr><td class="line1">&nbsp;&nbsp;&nbsp;&nbsp;<span class="comments">&lt;!--&nbsp;Temporal&nbsp;dependency&nbsp;configuration&nbsp;--&gt;</span><span>&nbsp;</span></td></tr><tr><td class="line2">&nbsp;&nbsp;&nbsp;&nbsp;<span class="tag">&lt;</span><span>temporal:requires&nbsp;</span><span class="attribute">field</span><span>=</span><span class="attribute-value">"fs"</span><span>&nbsp;</span><span class="attribute">timeout</span><span>=</span><span class="attribute-value">"300"</span><span>&nbsp;</span><span class="attribute">ontimeout</span><span>=</span><span class="attribute-value">"nullable"</span><span>/&gt;&nbsp;</span></td></tr><tr><td class="line1">&nbsp;</td></tr><tr><td class="line2">&nbsp;&nbsp;&nbsp;&nbsp;<span class="tag">&lt;</span><span>provides</span><span class="tag">/&gt;</span><span>&nbsp;</span></td></tr><tr><td class="line1">&nbsp;</td></tr><tr><td class="line2"><span class="tag">&lt;/</span><span>component</span><span class="tag">&gt;</span><span>&nbsp;</span></td></tr><tr><td class="line1"><span class="tag">&lt;/</span><span>iPOJO</span><span class="tag">&gt;</span><span>&nbsp;</span></td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="xml:nocontrols:nogutter" rows="10" readonly="readonly">&lt;iPOJO xmlns:temporal="org.apache.felix.ipojo.handler.temporal"&gt;
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]301&lt;component
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]302 className="org.apache.felix.ipojo.example.Temporal"&gt;
Clement Escoffier130ca572008-10-13 07:33:03 +0000[diff] [blame]303
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]304 &lt;!-- Temporal dependency configuration --&gt;
305 &lt;temporal:requires field="fs" timeout="300" ontimeout="nullable"/&gt;
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]306
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]307 &lt;provides/&gt;
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]308
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]309&lt;/component&gt;
310&lt;/iPOJO&gt;</textarea>
311<script class="javascript">
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326</div>
327
328<h2><a name="TemporalServiceDependency-Collectioninjection"></a>Collection injection</h2>
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]329<p>Temporal dependencies can also be injected inside Collection. To
330achieve this, the 'specification' attribute must indicates the looked
331specification, and the field must be a Collection.</p>
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]332<div class="code">
333<div class="dp-highlighter"><table class="dp-xml" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="tag">&lt;</span><span>iPOJO&nbsp;xmlns:</span><span class="attribute">temporal</span><span>=</span><span class="attribute-value">"org.apache.felix.ipojo.handler.temporal"</span><span>&gt;&nbsp;</span></td></tr><tr><td class="line2"><span class="tag">&lt;</span><span>component&nbsp;</span></td></tr><tr><td class="line1">&nbsp;&nbsp;&nbsp;&nbsp;<span class="attribute">className</span><span>=</span><span class="attribute-value">"org.apache.felix.ipojo.example.Temporal"</span><span>&gt;&nbsp;</span></td></tr><tr><td class="line2">&nbsp;</td></tr><tr><td class="line1">&nbsp;&nbsp;&nbsp;&nbsp;<span class="comments">&lt;!--&nbsp;Temporal&nbsp;dependency&nbsp;configuration&nbsp;--&gt;</span><span>&nbsp;</span></td></tr><tr><td class="line2">&nbsp;&nbsp;&nbsp;&nbsp;<span class="tag">&lt;</span><span>temporal:requires&nbsp;</span><span class="attribute">field</span><span>=</span><span class="attribute-value">"mycollection"</span><span>&nbsp;</span><span class="attribute">specification</span><span>=</span><span class="attribute-value">"my.service.specification"</span><span>/&gt;&nbsp;</span></td></tr><tr><td class="line1">&nbsp;</td></tr><tr><td class="line2">&nbsp;&nbsp;&nbsp;&nbsp;<span class="tag">&lt;</span><span>provides</span><span class="tag">/&gt;</span><span>&nbsp;</span></td></tr><tr><td class="line1">&nbsp;</td></tr><tr><td class="line2"><span class="tag">&lt;/</span><span>component</span><span class="tag">&gt;</span><span>&nbsp;</span></td></tr><tr><td class="line1"><span class="tag">&lt;/</span><span>iPOJO</span><span class="tag">&gt;</span><span>&nbsp;</span></td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="xml:nocontrols:nogutter" rows="10" readonly="readonly">&lt;iPOJO xmlns:temporal="org.apache.felix.ipojo.handler.temporal"&gt;
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]334&lt;component
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]335 className="org.apache.felix.ipojo.example.Temporal"&gt;
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]336
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]337 &lt;!-- Temporal dependency configuration --&gt;
338 &lt;temporal:requires field="mycollection" specification="my.service.specification"/&gt;
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]339
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]340 &lt;provides/&gt;
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]341
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]342&lt;/component&gt;
343&lt;/iPOJO&gt;</textarea>
344<script class="javascript">
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360
361<h2><a name="TemporalServiceDependency-Proxyinjection"></a>Proxy injection</h2>
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]362<p>Temporal dependencies can also be injected as proxies. So it is possible to give the temporal dependency to helper object.<br>
363On 'scalar' dependencies, the service lookup is executed during an
364operation invocation. Timeout policies are also executed is the lookup
365failed.<br>
366On aggregate dependencies (necessary Collection), the service lookup is
367executed when the iterator(), and toArray(...) methods are invoked.
368Timeout policies <br>
369are also executed if the lookup failed.</p>
370
371<p>To set a temporal dependency as a proxy, just add the <tt>proxy</tt> attribute as follows:</p>
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]372<div class="code">
373<div class="dp-highlighter"><table class="dp-xml" border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="line1"><span></span><span class="tag">&lt;</span><span>iPOJO&nbsp;xmlns:</span><span class="attribute">temporal</span><span>=</span><span class="attribute-value">"org.apache.felix.ipojo.handler.temporal"</span><span>&gt;&nbsp;</span></td></tr><tr><td class="line2"><span class="tag">&lt;</span><span>component&nbsp;</span></td></tr><tr><td class="line1">&nbsp;&nbsp;&nbsp;&nbsp;<span class="attribute">className</span><span>=</span><span class="attribute-value">"org.apache.felix.ipojo.example.Temporal"</span><span>&gt;&nbsp;</span></td></tr><tr><td class="line2">&nbsp;</td></tr><tr><td class="line1">&nbsp;&nbsp;&nbsp;&nbsp;<span class="comments">&lt;!--&nbsp;Temporal&nbsp;dependencies&nbsp;configuration&nbsp;--&gt;</span><span>&nbsp;</span></td></tr><tr><td class="line2">&nbsp;&nbsp;&nbsp;&nbsp;<span class="tag">&lt;</span><span>temporal:requires&nbsp;</span><span class="attribute">proxy</span><span>=</span><span class="attribute-value">"true"</span><span>&nbsp;</span><span class="attribute">field</span><span>=</span><span class="attribute-value">"fs"</span><span>/&gt;&nbsp;</span></td></tr><tr><td class="line1">&nbsp;&nbsp;&nbsp;&nbsp;<span class="tag">&lt;</span><span>temporal:requires&nbsp;</span><span class="attribute">proxy</span><span>=</span><span class="attribute-value">"true"</span><span>&nbsp;</span><span class="attribute">field</span><span>=</span><span class="attribute-value">"mycollection"</span><span>&nbsp;</span><span class="attribute">specification</span><span>=</span><span class="attribute-value">"my.service.specification"</span><span>/&gt;&nbsp;</span></td></tr><tr><td class="line2">&nbsp;</td></tr><tr><td class="line1">&nbsp;&nbsp;&nbsp;&nbsp;<span class="tag">&lt;</span><span>provides</span><span class="tag">/&gt;</span><span>&nbsp;</span></td></tr><tr><td class="line2">&nbsp;</td></tr><tr><td class="line1"><span class="tag">&lt;/</span><span>component</span><span class="tag">&gt;</span><span>&nbsp;</span></td></tr><tr><td class="line2"><span class="tag">&lt;/</span><span>iPOJO</span><span class="tag">&gt;</span><span>&nbsp;</span></td></tr></tbody></table></div><textarea style="display: none;" name="newcodemacro" class="xml:nocontrols:nogutter" rows="10" readonly="readonly">&lt;iPOJO xmlns:temporal="org.apache.felix.ipojo.handler.temporal"&gt;
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]374&lt;component
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]375 className="org.apache.felix.ipojo.example.Temporal"&gt;
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]376
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]377 &lt;!-- Temporal dependencies configuration --&gt;
378 &lt;temporal:requires proxy="true" field="fs"/&gt;
379 &lt;temporal:requires proxy="true" field="mycollection" specification="my.service.specification"/&gt;
Clement Escoffier3575f072008-06-06 12:12:01 +0000[diff] [blame]380
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]381 &lt;provides/&gt;
Clement Escoffier3575f072008-06-06 12:12:01 +0000[diff] [blame]382
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]383&lt;/component&gt;
384&lt;/iPOJO&gt;</textarea>
385<script class="javascript">
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Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]398
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]399</script>
400</div>
401
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]402
403<p>By default, proxies are disabled.</p>
404
405<h2><a name="TemporalServiceDependency-Download"></a>Download </h2>
406
407<p>The handler is available on the <a href="http://felix.apache.org/site/download.html" title="Download">download</a> page.<br>
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]408Sources are available on the Felix trunk at the following location: <a href="http://svn.apache.org/repos/asf/felix/trunk/ipojo/handler/temporal" rel="nofollow">http://svn.apache.org/repos/asf/felix/trunk/ipojo/handler/temporal</a>.
409<br clear="all">
410<br clear="all"></p>
Clement Escoffier3575f072008-06-06 12:12:01 +0000[diff] [blame]411
Clement Escoffier580d1902009-07-21 12:06:46 +0000[diff] [blame]412 </div>
413 <img src="temporal-service-dependency_files/footer.png" class="footer">
414</div>
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]415
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