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December 11, 2013 17:38
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/* | |
* 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.ipojo.runtime.core.test.interceptors; | |
import org.apache.felix.ipojo.ComponentInstance; | |
import org.apache.felix.ipojo.annotations.Component; | |
import org.apache.felix.ipojo.annotations.Provides; | |
import org.apache.felix.ipojo.annotations.ServiceProperty; | |
import org.apache.felix.ipojo.dependency.interceptors.DefaultDependencyInterceptor; | |
import org.apache.felix.ipojo.dependency.interceptors.ServiceRankingInterceptor; | |
import org.apache.felix.ipojo.dependency.interceptors.ServiceTrackingInterceptor; | |
import org.apache.felix.ipojo.dependency.interceptors.TransformedServiceReference; | |
import org.apache.felix.ipojo.handlers.configuration.ConfigurationHandlerDescription; | |
import org.apache.felix.ipojo.handlers.configuration.ConfigurationListener; | |
import org.apache.felix.ipojo.runtime.core.test.services.Setter; | |
import org.apache.felix.ipojo.util.DependencyModel; | |
import org.osgi.framework.BundleContext; | |
import org.osgi.framework.ServiceReference; | |
import java.util.ArrayList; | |
import java.util.List; | |
import java.util.Map; | |
/** | |
* An interceptor implements both ranking and tracking interfaces. | |
* It first adds the 'intercepted' property to the services, and then select only the provider having a grade | |
* matching the instance's 'grade' property. | |
*/ | |
@Component(immediate = true) | |
@Provides | |
public class AdvancedTrackerAndRankerInterceptor extends DefaultDependencyInterceptor implements | |
ServiceTrackingInterceptor, ServiceRankingInterceptor, ConfigurationListener { | |
@ServiceProperty | |
private String target; | |
@Override | |
public void close(DependencyModel dependency) { | |
super.close(dependency); | |
ConfigurationHandlerDescription handler = (ConfigurationHandlerDescription) dependency.getComponentInstance().getInstanceDescription() | |
.getHandlerDescription("org.apache.felix.ipojo:properties"); | |
handler.removeListener(this); | |
} | |
@Override | |
public void open(DependencyModel dependency) { | |
super.open(dependency); | |
ConfigurationHandlerDescription handler = (ConfigurationHandlerDescription) dependency.getComponentInstance().getInstanceDescription() | |
.getHandlerDescription("org.apache.felix.ipojo:properties"); | |
handler.addListener(this); | |
} | |
@Override | |
public List<ServiceReference> getServiceReferences(DependencyModel dependency, List<ServiceReference> matching) { | |
List<ServiceReference> list = new ArrayList<ServiceReference>(); | |
Integer grade = getInstanceGrade(dependency); | |
for (ServiceReference ref : matching) { | |
if (grade.equals(ref.getProperty("grade"))) { | |
list.add(ref); | |
} | |
} | |
return list; | |
} | |
private Integer getInstanceGrade(DependencyModel dependency) { | |
ConfigurationHandlerDescription handler = (ConfigurationHandlerDescription) dependency.getComponentInstance().getInstanceDescription() | |
.getHandlerDescription("org.apache.felix.ipojo:properties"); | |
return (Integer) handler.getPropertyByName("grade").getCurrentValue(); | |
} | |
@Override | |
public List<ServiceReference> onServiceArrival(DependencyModel dependency, List<ServiceReference> matching, ServiceReference<?> reference) { | |
return getServiceReferences(dependency, matching); | |
} | |
@Override | |
public List<ServiceReference> onServiceDeparture(DependencyModel dependency, List<ServiceReference> matching, ServiceReference<?> reference) { | |
return getServiceReferences(dependency, matching); | |
} | |
@Override | |
public List<ServiceReference> onServiceModified(DependencyModel dependency, List<ServiceReference> matching, ServiceReference<?> reference) { | |
return getServiceReferences(dependency, matching); | |
} | |
@Override | |
public <S> TransformedServiceReference<S> accept(DependencyModel dependency, BundleContext context, TransformedServiceReference<S> ref) { | |
return ref.addProperty("intercepted", true); | |
} | |
/** | |
* Notifies the managed dependencies of a change in the set of services selected by this interceptor. | |
* The dependency will call the getServiceReferences method to recompute the set of selected services. | |
*/ | |
public void invalidateSelectedServices() { | |
List<DependencyModel> list = new ArrayList<DependencyModel>(); | |
synchronized (this) { | |
list.addAll(dependencies); | |
} | |
for (DependencyModel dep : list) { | |
dep.invalidateSelectedServices(); | |
} | |
} | |
@Override | |
public void configurationChanged(ComponentInstance instance, Map<String, Object> configuration) { | |
invalidateSelectedServices(); | |
} | |
} |
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