| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.felix.dm; |
| |
| import java.util.Dictionary; |
| |
| import org.apache.felix.dm.Component.ServiceScope; |
| |
| /** |
| * Interface used to configure the various parameters needed when defining |
| * a Dependency Manager bundle adapter component. |
| * |
| * Bundle Adapters, like {@link AdapterComponent}, are used to "extend" |
| * existing bundles, and can publish an adapter services based on the existing bundle. |
| * An example would be implementing a video player which adapters a resource bundle having |
| * some specific headers. |
| * <p>When you create a bundle adapter component, it will be applied |
| * to any bundle that matches the specified bundle state mask as well as the specified ldap filter |
| * used to match the bundle manifest headers. The bundle adapter will be registered |
| * with the specified bundle manifest headers as service properties, plus any extra |
| * properties you suppl. If you declare a bundle field in your bundle adapter class, |
| * it will be injected it will be injected with the original bundle. |
| * |
| * <h3>Usage Examples</h3> |
| * |
| * Here is a sample showing a VideoPlayer adapter component which plays a video found from |
| * a bundle having a Video-Path manifest header. |
| * |
| * <blockquote><pre> |
| * {@code |
| * public class Activator extends DependencyActivatorBase { |
| * &Override |
| * public void init(BundleContext context, DependencyManager dm) throws Exception { |
| * BundleComponent bundleComponent = createBundleComponent() |
| * .setFilter(Bundle.ACTIVE, "(Video-Path=*)") |
| * .setInterface(VideoPlayer.class.getName(), null) |
| * .setImplementation(VideoPlayerImpl.class); |
| * dm.add(bundleComponent); |
| * } |
| * } |
| * |
| * public interface VideoPlayer { |
| * void play(); |
| * } |
| * |
| * public class VideoPlayerImpl implements VideoPlayer { |
| * volatile Bundle bundle; // injected |
| * String path; |
| * |
| * void start() { |
| * path = bundle.getHeaders().get("Video-Path"); |
| * } |
| * |
| * void play() { |
| * ... |
| * } |
| * } |
| * } </pre></blockquote> |
| * |
| * <p> When you use callbacks to get injected with the bundle, the "add", "change", "remove" callbacks |
| * support the following method signatures: |
| * |
| * <pre>{@code |
| * (Bundle) |
| * (Object) |
| * (COmponent, Bundle) |
| * }</pre> |
| * |
| * @see DependencyManager#createBundleComponent() |
| */ |
| public interface BundleComponent extends Component { |
| |
| /** |
| * Sets the component scope. |
| * @param scope the component scope (default=SINGLETON) |
| * |
| * @return this component |
| */ |
| BundleComponent setScope(ServiceScope scope); |
| |
| /** |
| * Sets the implementation for this component. You can actually specify |
| * an instance you have instantiated manually, or a <code>Class</code> |
| * that will be instantiated using its default constructor when the |
| * required dependencies are resolved, effectively giving you a lazy |
| * instantiation mechanism. |
| * |
| * There are four special methods that are called when found through |
| * reflection to give you life cycle management options: |
| * <ol> |
| * <li><code>init()</code> is invoked after the instance has been |
| * created and dependencies have been resolved, and can be used to |
| * initialize the internal state of the instance or even to add more |
| * dependencies based on runtime state</li> |
| * <li><code>start()</code> is invoked right before the service is |
| * registered</li> |
| * <li><code>stop()</code> is invoked right after the service is |
| * unregistered</li> |
| * <li><code>destroy()</code> is invoked after all dependencies are |
| * removed</li> |
| * </ol> |
| * In short, this allows you to initialize your instance before it is |
| * registered, perform some post-initialization and pre-destruction code |
| * as well as final cleanup. If a method is not defined, it simply is not |
| * called, so you can decide which one(s) you need. If you need even more |
| * fine-grained control, you can register as a service state listener too. |
| * |
| * @param implementation the implementation |
| * @return this component |
| * @see ComponentStateListener |
| */ |
| BundleComponent setImplementation(Object implementation); |
| |
| /** |
| * Adds dependency(ies) to this component, atomically. If the component is already active or if you add |
| * dependencies from the init method, then you should add all the dependencies in one single add method call |
| * (using the varargs argument), because this method may trigger component activation (like |
| * the ServiceTracker.open() method does). |
| * |
| * @param dependencies the dependencies to add. |
| * @return this component |
| */ |
| BundleComponent add(Dependency ... dependencies); |
| |
| /** |
| * Removes a dependency from the component. |
| * @param d the dependency to remove |
| * @return this component |
| */ |
| BundleComponent remove(Dependency d); |
| |
| /** |
| * Adds a component state listener to this component. |
| * |
| * @param listener the state listener |
| */ |
| BundleComponent add(ComponentStateListener listener); |
| |
| /** |
| * Removes a component state listener from this component. |
| * |
| * @param listener the state listener |
| */ |
| BundleComponent remove(ComponentStateListener listener); |
| |
| /** |
| * Sets the public interface under which this component should be registered |
| * in the OSGi service registry. |
| * |
| * @param serviceName the name of the service interface |
| * @param properties the properties for this service |
| * @return this component |
| */ |
| BundleComponent setInterface(String serviceName, Dictionary<?,?> properties); |
| |
| /** |
| * Sets the public interfaces under which this component should be registered |
| * in the OSGi service registry. |
| * |
| * @param serviceNames the names of the service interface |
| * @param properties the properties for these services |
| * @return this component |
| */ |
| BundleComponent setInterface(String[] serviceNames, Dictionary<?, ?> properties); |
| |
| /** |
| * Sets the public interface under which this component should be registered |
| * in the OSGi service registry. |
| * |
| * @param serviceName the name of the service interface |
| * @param properties the properties for this service |
| * @return this component |
| */ |
| BundleComponent setInterface(Class<?> serviceName, Dictionary<?,?> properties); |
| |
| /** |
| * Sets the public interfaces under which this component should be registered |
| * in the OSGi service registry. |
| * |
| * @param serviceNames the names of the service interface |
| * @param properties the properties for these services |
| * @return this component |
| */ |
| BundleComponent setInterface(Class<?>[] serviceNames, Dictionary<?, ?> properties); |
| |
| /** |
| * Configures auto configuration of injected classes in the component instance. |
| * The following injections are currently performed, unless you explicitly |
| * turn them off: |
| * <dl> |
| * <dt>BundleContext</dt><dd>the bundle context of the bundle</dd> |
| * <dt>ServiceRegistration</dt><dd>the service registration used to register your service</dd> |
| * <dt>DependencyManager</dt><dd>the dependency manager instance</dd> |
| * <dt>Component</dt><dd>the component instance of the dependency manager</dd> |
| * </dl> |
| * |
| * @param clazz the class (from the list above) |
| * @param autoConfig <code>false</code> to turn off auto configuration |
| */ |
| BundleComponent setAutoConfig(Class<?> clazz, boolean autoConfig); |
| |
| /** |
| * Configures auto configuration of injected classes in the component instance. |
| * |
| * @param clazz the class (from the list above) |
| * @param instanceName the name of the instance to inject the class into |
| * @see #setAutoConfig(Class, boolean) |
| */ |
| BundleComponent setAutoConfig(Class<?> clazz, String instanceName); |
| |
| /** |
| * Sets the service properties associated with the component. If the service |
| * was already registered, it will be updated. |
| * |
| * @param serviceProperties the properties |
| */ |
| BundleComponent setServiceProperties(Dictionary<?, ?> serviceProperties); |
| |
| /** |
| * Sets the names of the methods used as callbacks. These methods, when found, are |
| * invoked as part of the life cycle management of the component implementation. The |
| * dependency manager will look for a method of this name with the following signatures, |
| * in this order: |
| * <ol> |
| * <li>method(Component component)</li> |
| * <li>method()</li> |
| * </ol> |
| * |
| * @param init the name of the init method |
| * @param start the name of the start method |
| * @param stop the name of the stop method |
| * @param destroy the name of the destroy method |
| * @return the component |
| */ |
| BundleComponent setCallbacks(String init, String start, String stop, String destroy); |
| |
| /** |
| * Sets the names of the methods used as callbacks. These methods, when found, are |
| * invoked on the specified instance as part of the life cycle management of the component |
| * implementation. |
| * <p> |
| * See setCallbacks(String init, String start, String stop, String destroy) for more |
| * information on the signatures. Specifying an instance means you can create a manager |
| * that will be invoked whenever the life cycle of a component changes and this manager |
| * can then decide how to expose this life cycle to the actual component, offering an |
| * important indirection when developing your own component models. |
| * |
| * @return this component |
| */ |
| BundleComponent setCallbacks(Object instance, String init, String start, String stop, String destroy); |
| |
| /** |
| * Sets the factory to use to create the implementation. You can specify |
| * both the factory class and method to invoke. The method should return |
| * the implementation, and can use any method to create it. Actually, this |
| * can be used together with <code>setComposition</code> to create a |
| * composition of instances that work together to implement a component. The |
| * factory itself can also be instantiated lazily by not specifying an |
| * instance, but a <code>Class</code>. |
| * |
| * @param factory the factory instance or class |
| * @param createMethod the name of the create method |
| * @return this component |
| */ |
| BundleComponent setFactory(Object factory, String createMethod); |
| |
| /** |
| * Sets the factory to use to create the implementation. You specify the |
| * method to invoke. The method should return the implementation, and can |
| * use any method to create it. Actually, this can be used together with |
| * <code>setComposition</code> to create a composition of instances that |
| * work together to implement a component. |
| * <p> |
| * Note that currently, there is no default for the factory, so please use |
| * <code>setFactory(factory, createMethod)</code> instead. |
| * |
| * @param createMethod the name of the create method |
| * @return this component |
| */ |
| BundleComponent setFactory(String createMethod); |
| |
| /** |
| * Sets the instance and method to invoke to get back all instances that |
| * are part of a composition and need dependencies injected. All of them |
| * will be searched for any of the dependencies. The method that is |
| * invoked must return an <code>Object[]</code>. |
| * |
| * @param instance the instance that has the method |
| * @param getMethod the method to invoke |
| * @return this component |
| */ |
| BundleComponent setComposition(Object instance, String getMethod); |
| |
| /** |
| * Sets the method to invoke on the service implementation to get back all |
| * instances that are part of a composition and need dependencies injected. |
| * All of them will be searched for any of the dependencies. The method that |
| * is invoked must return an <code>Object[]</code>. |
| * |
| * @param getMethod the method to invoke |
| * @return this component |
| */ |
| BundleComponent setComposition(String getMethod); |
| |
| /** |
| * Activate debug for this component. Informations related to dependency processing will be displayed |
| * using osgi log service, our to standard output if no log service is currently available. |
| * @param label |
| */ |
| BundleComponent setDebug(String label); |
| |
| /** |
| * Sets the bundle state mask and bundle manifest headers filter. |
| * |
| * @param bundleStateMask the bundle state mask to apply |
| * @param bundleFilter the filter to apply to the bundle manifest |
| * @return this BundleComponent |
| */ |
| BundleComponent setBundleFilter(int bundleStateMask, String bundleFilter); |
| |
| /** |
| * Sets the callbacks to invoke when injecting the bundle into the adapter component. |
| * |
| * @param add name of the callback method to invoke on add |
| * @param change name of the callback method to invoke on change |
| * @param remove name of the callback method to invoke on remove |
| * @return this BundleComponent |
| */ |
| BundleComponent setBundleCallbacks(String add, String change, String remove); |
| |
| /** |
| * Sets the instance to invoke the callbacks on (null by default, meaning the callbacks have to be invoked on the adapter itself) |
| * |
| * @param callbackInstance the instance to invoke the callbacks on (null by default, meaning the callbacks have to be invoked on the adapter itself) |
| * @return this BundleComponent |
| */ |
| BundleComponent setBundleCallbackInstance(Object callbackInstance); |
| |
| /** |
| * Sets if the bundle manifest headers should be propagated to the bundle component adapter service consumer (true by default). |
| * The component service properties take precedence over the propagated bundle manifest headers. |
| * @param propagate true if the bundle manifest headers should be propagated to the adapter service consumers |
| * @return this BundleComponent |
| */ |
| BundleComponent setPropagate(boolean propagate); |
| |
| } |