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<h1 class="page">Dependency Manager - Bundle Dependency</h1>
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<p>A bundle dependency allows you to depend on a bundle in a certain set of states, as indicated by a state mask.
You can also use a filter condition that is matched against all manifest entries.
Finally you can provide a reference to an existing bundle.</p>
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<p>To define a bundle dependency, you need to use the <a href="http://felix.apache.org/apidocs/dependencymanager/r13/org/apache/felix/dm/BundleDependency.html">BundleDependecy</a> interface.
This interface can be created using DependencyActivatorBase.createBundleDependency() or DependencyManager.createBundleDependency() methods;</p>
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<p>Here is an example of a component which tracks all ACTIVE bundles having a Service-Component header in the manifest:</p>
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<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public class Activator extends DependencyActivatorBase {
@Override
public void init(BundleContext ctx, DependencyManager dm) throws Exception {
Component scr = createComponent()
.setImplementation(ScrRuntime.class)
.add(createBundleDependency().setFilter("(Service-Component=*").setStateMask(Bundle.ACTIVE).setCallbacks("bind", "unbind"));
}
}
public class ScrRuntime {
void bind(Bundle bundle) {
// load SCR descriptors from the starting bundle
}
void unbind(Bundle bundle) {
// unload SCR descriptors from the starting bundle
}
}</code></pre>
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<div class="paragraph">
<p>The dependency is optional by default, and will invoke the ScrRuntime.bind callback each time a bundle containing some Declarative Service component is started.</p>
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