| /* |
| * 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.dependencymanager.samples.dynamicdep.api; |
| |
| import org.apache.felix.dm.Component; |
| import org.apache.felix.dm.DependencyManager; |
| import org.osgi.service.cm.ConfigurationException; |
| import org.osgi.service.event.EventAdmin; |
| import org.osgi.service.log.LogService; |
| |
| /** |
| * This Component depends on the following services declared from the Activator: |
| * - LogService |
| * - Configuration with PID="org.apache.felix.dependencymanager.samples.dynamicdep.api.DynamicDependencyConfiguration" |
| * |
| * We then define a dynamic dependency on a Storage Service from our init method and we configure the dependency filter and |
| * required from using the configuration injected in our updated method. |
| * |
| * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| */ |
| public class DynamicDependency { |
| |
| volatile EventAdmin eventAdmin; // injected and defined in Activator |
| volatile LogService log; // injected and defined in Activator |
| volatile Storage storage; // dependency defined dynamically from our init() method |
| private String storageType; // type of Storage to depend on (we get that from configadmin) |
| private boolean storageRequired; // is our Storage dependency required or not (we get that from configadmin) |
| |
| /** |
| * This is the first callback: we are injected with our configuration. |
| */ |
| public void updated(DynamicDependencyConfiguration cnf) throws ConfigurationException { |
| if (cnf != null) { |
| storageType = cnf.storageType(); |
| storageRequired = cnf.storageRequired(); |
| } |
| } |
| |
| /** |
| * The configuration has been injected and also other required dependencies defined from the Activator. |
| * Now, define some dynamic dependencies (here we use the configuration injected from our updated method in |
| * order to configure the filter and required flag for the "Storage" dependency). |
| */ |
| public void init(Component c) { |
| log.log(LogService.LOG_WARNING, "init: storage type=" + storageType + ", storageRequired=" + storageRequired); |
| DependencyManager dm = c.getDependencyManager(); |
| // all dynamic dependencies must be declared atomically in the Component.add(...) method, which accepts varargs. |
| c.add(dm.createServiceDependency().setService(Storage.class, "(type=" + storageType + ")").setRequired(storageRequired)); |
| } |
| |
| /** |
| * All dependencies injected, including dynamic dependencies defined from init method. |
| */ |
| void start() { |
| log.log(LogService.LOG_WARNING, "start"); |
| // Use storage to load/store some key-value pairs ... |
| storage.store("gabu", "zo"); |
| } |
| |
| } |