| /* |
| * 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.karaf.service.interceptor.impl.runtime.registry; |
| |
| import static java.util.Optional.ofNullable; |
| import static java.util.function.Function.identity; |
| import static java.util.stream.Collectors.toList; |
| import static java.util.stream.Collectors.toMap; |
| |
| import java.lang.annotation.Annotation; |
| import java.lang.reflect.Method; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Hashtable; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.function.Consumer; |
| import java.util.stream.Stream; |
| |
| import org.apache.karaf.service.interceptor.api.InterceptorBinding; |
| import org.apache.karaf.service.interceptor.impl.runtime.PropertiesManager; |
| import org.osgi.framework.Constants; |
| import org.osgi.framework.ServiceEvent; |
| import org.osgi.framework.ServiceListener; |
| import org.osgi.framework.ServiceReference; |
| |
| public class InterceptedServiceRegistry implements ServiceListener { |
| private final PropertiesManager propertiesManager; |
| private final Consumer<ServiceReference<?>> onServiceAddition; |
| private final Consumer<ServiceReference<?>> onServiceRemoval; |
| private final Map<ServiceReference<?>, RegistrationState> references = new ConcurrentHashMap<>(); |
| |
| public InterceptedServiceRegistry(final Consumer<ServiceReference<?>> onServiceAddition, |
| final Consumer<ServiceReference<?>> onServiceRemoval, |
| final PropertiesManager propertiesManager) { |
| this.onServiceAddition = onServiceAddition; |
| this.onServiceRemoval = onServiceRemoval; |
| this.propertiesManager = propertiesManager; |
| } |
| |
| @Override |
| public void serviceChanged(final ServiceEvent serviceEvent) { |
| final ServiceReference<?> ref = serviceEvent.getServiceReference(); |
| switch (serviceEvent.getType()) { |
| case ServiceEvent.REGISTERED: |
| doRegister(ref); |
| break; |
| case ServiceEvent.MODIFIED_ENDMATCH: |
| case ServiceEvent.UNREGISTERING: |
| doRemove(ref); |
| break; |
| case ServiceEvent.MODIFIED: |
| ofNullable(references.get(ref)) |
| .filter(reg -> didChange(ref, reg)) |
| .ifPresent(reg -> { |
| doRemove(ref); |
| doRegister(ref); |
| }); |
| default: |
| } |
| } |
| |
| private boolean didChange(final ServiceReference<?> ref, final RegistrationState reg) { |
| return !reg.registrationProperties.equals(propertiesManager.collectProperties(ref)) || |
| !reg.bindingsPerMethod.equals(computeBindings(ref)); |
| } |
| |
| private void doRegister(final ServiceReference<?> ref) { |
| references.put(ref, new RegistrationState(propertiesManager.collectProperties(ref), computeBindings(ref))); |
| onServiceAddition.accept(ref); |
| } |
| |
| private void doRemove(final ServiceReference<?> ref) { |
| onServiceRemoval.accept(ref); |
| references.remove(ref); |
| } |
| |
| private Map<Method, List<Class<?>>> computeBindings(final ServiceReference<?> ref) { |
| final List<Class<?>> types = propertiesManager.unflattenStringValues(ref.getProperty(Constants.OBJECTCLASS)) |
| .map(it -> { |
| try { |
| return ref.getBundle().loadClass(it); |
| } catch (final ClassNotFoundException e) { |
| throw new IllegalStateException(e); |
| } |
| }) |
| .distinct() |
| .collect(toList()); |
| final Collection<Annotation> globalInterceptors = types.stream() |
| .flatMap(type -> Stream.of(type.getAnnotations())) |
| .filter(methodAnnotation -> methodAnnotation.annotationType().isAnnotationPresent(InterceptorBinding.class)) |
| .distinct() |
| .collect(toList()); |
| return types.stream() |
| .flatMap(type -> Stream.of(type.getMethods())) |
| .collect(toMap(identity(), m -> Stream.concat( |
| globalInterceptors.stream(), |
| Stream.of(m.getAnnotations())) |
| .filter(methodAnnotation -> methodAnnotation.annotationType().isAnnotationPresent(InterceptorBinding.class)) |
| .distinct() |
| .map(Annotation::annotationType) // todo: keep Annotation with values |
| .collect(toList()))); |
| } |
| |
| public <T> Stream<Class<?>> getBindings(final ServiceReference<T> ref) { |
| return ofNullable(references.get(ref)) |
| .map(reg -> reg.bindingsPerMethod.values().stream().flatMap(Collection::stream).distinct()) |
| .orElseGet(Stream::empty); |
| } |
| |
| public <T> Map<Method, List<Class<?>>> getInterceptorsPerMethod(final ServiceReference<T> ref) { |
| return ofNullable(references.get(ref)) |
| .map(reg -> reg.bindingsPerMethod) |
| .orElseGet(Collections::emptyMap); |
| } |
| |
| private static class RegistrationState { |
| private final Hashtable<String, Object> registrationProperties; |
| private final Map<Method, List<Class<?>>> bindingsPerMethod; |
| |
| private RegistrationState(final Hashtable<String, Object> registrationProperties, |
| final Map<Method, List<Class<?>>> bindingsPerMethod) { |
| this.registrationProperties = registrationProperties; |
| this.bindingsPerMethod = bindingsPerMethod; |
| } |
| } |
| } |