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| <h1 class="page">Dependency Manager - Configuration Dependency</h1> |
| <div class="paragraph"> |
| <p>A configuration dependency is always required, and allows you to depend on the availability of a valid configuration for your component. |
| Configuration dependency is required by default.</p> |
| </div> |
| <div class="paragraph"> |
| <p>To define a configuration dependency, you need to use the <a href="http://felix.apache.org/apidocs/dependencymanager/r13/org/apache/felix/dm/ConfigurationDependency.html">ConfigurationDependency</a> interface. |
| This interface can be created using DependencyActivatorBase.createConfigurationDependency() or DependencyManager.createConfigurationDependency() methods.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The dependency injects by default the configuration in an "updated" callback which can accept the following parameters:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><code>updated(Dictionary)</code></p> |
| </li> |
| <li> |
| <p><code>updated(Component, Dictionary)</code></p> |
| </li> |
| <li> |
| <p><code>updated(<ConfigurationType>)</code></p> |
| </li> |
| <li> |
| <p><code>updated(Component, <ConfigurationType>)</code></p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>If you only specify a pid, by default the callback method name is assumed to be "updated".</p> |
| </div> |
| <div class="paragraph"> |
| <p>Configuration types are a new feature that allows you to specify a Java interface that is implemented by DM and such interface is then injected to your callback instead of the actual Dictionary. |
| Using such configuration interface provides a way for creating type-safe configurations from a actual Dictionary that is normally injected by Dependency Manager. |
| The callback accepts in argument an interface that you have to provide, and DM will inject a proxy that converts method calls from your configuration-type to lookups in the actual map or dictionary. |
| The results of these lookups are then converted to the expected return type of the invoked configuration method. |
| As proxies are injected, no implementations of the desired configuration-type are necessary!</p> |
| </div> |
| <div class="paragraph"> |
| <p>The lookups performed are based on the name of the method called on the configuration type. |
| The method names are "mangled" to the following form: [lower case letter] [any valid character]*. |
| Method names starting with get or is (JavaBean convention) are stripped from these prefixes. |
| For example: given a dictionary with the key "foo" can be accessed from a configuration-type using the following method names: foo(), getFoo() and isFoo().</p> |
| </div> |
| <div class="paragraph"> |
| <p>The return values supported are:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>primitive types (or their object wrappers);</p> |
| </li> |
| <li> |
| <p>strings;</p> |
| </li> |
| <li> |
| <p>enums;</p> |
| </li> |
| <li> |
| <p>arrays of primitives/strings;</p> |
| </li> |
| <li> |
| <p>Collection types;</p> |
| </li> |
| <li> |
| <p>Map types;</p> |
| </li> |
| <li> |
| <p>Classes and interfaces.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>When an interface is returned, it is treated equally to a configuration type, that is, a proxy is returned.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Arrays can be represented either as comma-separated values, optionally enclosed in square brackets. |
| For example: <code>[ a, b, c ]</code> and <code>a, b,c</code> are both considered an array of length 3 with the values "a", "b" and "c". |
| Alternatively, you can append the array index to the key in the dictionary to obtain the same: a dictionary with "arr.0" => "a", "arr.1" => "b", "arr.2" => "c" would result in the same array as the earlier examples.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Maps can be represented as single string values similarly as arrays, each value consisting of both the key and value separated by a dot. |
| Optionally, the value can be enclosed in curly brackets. |
| Similar to array, you can use the same dot notation using the keys. |
| For example, a dictionary with:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>map={key1.value1,key2.value2}</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>and a dictionary with:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>map.key1=value1 |
| map.key2=value2</pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>result in the <em>same</em> map being returned. |
| Instead of a map, you could also define an interface with the methods <code>getKey1()</code> and <code>getKey2()</code> and use that interface as return type instead of a Map.</p> |
| </div> |
| <div class="paragraph"> |
| <p>In case a lookup does not yield a value from the underlying map or dictionary, the following rules are applied:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>primitive types yield their default value, as defined by the Java Specification;</p> |
| </li> |
| <li> |
| <p>string, Classes and enum values yield <code>null</code>;</p> |
| </li> |
| <li> |
| <p>for arrays, collections and maps, an <em>empty</em> array/collection/map is returned;</p> |
| </li> |
| <li> |
| <p>for other interface types that are treated as configuration type a Null-object is returned.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>Here is a component depends on a configuration:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public class ServiceImpl { |
| void updated(Dictionary<String, Object> cnf) { |
| if (cnf != null) { |
| String addr = (String) cnf.get("address"); |
| int port = Integer.valueOf(cnf.get("port"); |
| ... |
| } |
| } |
| } |
| |
| public class Activator extends DependencyActivatorBase { |
| @Override |
| public void init(BundleContext ctx, DependencyManager dm) throws Exception { |
| dm.add(createComponent() |
| .setImplementation(ServiceImpl.class) |
| .add(createConfigurationDependency().setPid(ServiceImpl.class.getName())); |
| } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Here is the same example, but a custom configuration type interface is used (by default, the FQDN of the configuration type is assumed to be the configuration pid):</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public interface MyConfig { |
| String getAddress(); |
| int getPort(); |
| } |
| |
| public class ServiceImpl { |
| void modified(MyConfig cnf) { |
| if (cnf != null) { |
| String addr = cnf.getAddress(); |
| int port = cnf.getPort(); |
| ... |
| } |
| } |
| } |
| |
| public class Activator extends DependencyActivatorBase { |
| @Override |
| public void init(BundleContext ctx, DependencyManager dm) throws Exception { |
| dm.add(createComponent() |
| .setImplementation(ServiceImpl.class) |
| .add(createConfigurationDependency().setCallback("modified", MyConfig.class); |
| } |
| }</code></pre> |
| </div> |
| </div> |
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