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| <div class="subTitle">org.apache.felix.ipojo.dependency.interceptors</div> |
| <h2 title="Interface ServiceTrackingInterceptor" class="title">Interface ServiceTrackingInterceptor</h2> |
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| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../../../org/apache/felix/ipojo/dependency/interceptors/DefaultServiceTrackingInterceptor.html" title="class in org.apache.felix.ipojo.dependency.interceptors">DefaultServiceTrackingInterceptor</a>, <a href="../../../../../../org/apache/felix/ipojo/dependency/impl/FilterBasedServiceTrackingInterceptor.html" title="class in org.apache.felix.ipojo.dependency.impl">FilterBasedServiceTrackingInterceptor</a></dd> |
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| <pre>public interface <a href="../../../../../../src-html/org/apache/felix/ipojo/dependency/interceptors/ServiceTrackingInterceptor.html#line.39">ServiceTrackingInterceptor</a> |
| extends <a href="../../../../../../org/apache/felix/ipojo/dependency/interceptors/DependencyInterceptor.html" title="interface in org.apache.felix.ipojo.dependency.interceptors">DependencyInterceptor</a></pre> |
| <div class="block">A service to influence the visibility of services within a service dependency. |
| This service is called to determine which services from the tracker (base set) is going to the matching set. |
| |
| Several tracking interceptors can be plugged to the same service dependency. In this case, |
| a chain is created where all interceptor can influence the next one. If the dependency has a filter, |
| a tracking interceptor using this filter is the last interceptor of the chain. |
| |
| Obviously an interceptor can be plugged to several dependencies. Conversely, several tracking interceptor can be |
| plugged to one dependency.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.10.1</dd> |
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| <code><a href="../../../../../../org/apache/felix/ipojo/dependency/interceptors/DependencyInterceptor.html#TARGET_PROPERTY">TARGET_PROPERTY</a></code></li> |
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| <td class="colFirst"><code><S> <a href="../../../../../../org/apache/felix/ipojo/dependency/interceptors/TransformedServiceReference.html" title="interface in org.apache.felix.ipojo.dependency.interceptors">TransformedServiceReference</a><S></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/felix/ipojo/dependency/interceptors/ServiceTrackingInterceptor.html#accept-org.apache.felix.ipojo.util.DependencyModel-BundleContext-org.apache.felix.ipojo.dependency.interceptors.TransformedServiceReference-">accept</a></span>(<a href="../../../../../../org/apache/felix/ipojo/util/DependencyModel.html" title="class in org.apache.felix.ipojo.util">DependencyModel</a> dependency, |
| BundleContext context, |
| <a href="../../../../../../org/apache/felix/ipojo/dependency/interceptors/TransformedServiceReference.html" title="interface in org.apache.felix.ipojo.dependency.interceptors">TransformedServiceReference</a><S> ref)</code> |
| <div class="block">Does the interceptor accepts the reference of not ? |
| This methods has two goals.</div> |
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| <h3>Methods inherited from interface org.apache.felix.ipojo.dependency.interceptors.<a href="../../../../../../org/apache/felix/ipojo/dependency/interceptors/DependencyInterceptor.html" title="interface in org.apache.felix.ipojo.dependency.interceptors">DependencyInterceptor</a></h3> |
| <code><a href="../../../../../../org/apache/felix/ipojo/dependency/interceptors/DependencyInterceptor.html#close-org.apache.felix.ipojo.util.DependencyModel-">close</a>, <a href="../../../../../../org/apache/felix/ipojo/dependency/interceptors/DependencyInterceptor.html#open-org.apache.felix.ipojo.util.DependencyModel-">open</a></code></li> |
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| <h4>accept</h4> |
| <pre><S> <a href="../../../../../../org/apache/felix/ipojo/dependency/interceptors/TransformedServiceReference.html" title="interface in org.apache.felix.ipojo.dependency.interceptors">TransformedServiceReference</a><S> <a href="../../../../../../src-html/org/apache/felix/ipojo/dependency/interceptors/ServiceTrackingInterceptor.html#line.61">accept</a>(<a href="../../../../../../org/apache/felix/ipojo/util/DependencyModel.html" title="class in org.apache.felix.ipojo.util">DependencyModel</a> dependency, |
| BundleContext context, |
| <a href="../../../../../../org/apache/felix/ipojo/dependency/interceptors/TransformedServiceReference.html" title="interface in org.apache.felix.ipojo.dependency.interceptors">TransformedServiceReference</a><S> ref)</pre> |
| <div class="block">Does the interceptor accepts the reference of not ? |
| This methods has two goals. It can filter out undesirable services by returning null. In addition, |
| it can <em>transform</em> the service reference to add / remove service properties. In this case, |
| it must return the <strong>same</strong> instance of <a href="../../../../../../org/apache/felix/ipojo/dependency/interceptors/TransformedServiceReference.html" title="interface in org.apache.felix.ipojo.dependency.interceptors"><code>TransformedServiceReference</code></a>, |
| but with the new set of properties. |
| |
| So to filter out the service, return null. To accept the service, |
| return the reference as it is. To transform the service update the service reference and return it. |
| |
| When several interceptors are collaborating on the same dependency, a chain is created. The received reference |
| is the reference modified by the preceding interceptor. Notice that once an interceptor returns null the chain is interrupted and the service rejected.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>S</code> - the type of service</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>dependency</code> - the dependency</dd> |
| <dd><code>context</code> - the context of the dependency</dd> |
| <dd><code>ref</code> - the reference</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>null to filter out the service, the, optionally updated, reference to accept it.</dd> |
| </dl> |
| </li> |
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