| /* |
| * 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.impl; |
| |
| import java.util.Dictionary; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import java.util.function.Supplier; |
| |
| import org.apache.felix.dm.Logger; |
| import org.apache.felix.dm.context.ComponentContext; |
| import org.apache.felix.dm.context.Event; |
| import org.osgi.framework.Bundle; |
| import org.osgi.framework.BundleContext; |
| import org.osgi.framework.ServiceReference; |
| |
| /** |
| * An event for a service dependency. |
| * Not thread safe, but this class is assumed to be used under the protection of the component serial queue. |
| */ |
| public class ServiceEventImpl extends Event { |
| /** |
| * The service reference on which a service dependency depends on |
| */ |
| private final ServiceReference<?> m_reference; |
| |
| /** |
| * The bundle context of the bundle which has created the service dependency. If not null, |
| * will be used in close method when ugetting the service reference of the dependency. |
| */ |
| private final BundleContext m_bundleContext; |
| |
| /** |
| * The bundle which has created the service dependency. |
| */ |
| private final Bundle m_bundle; |
| |
| /** |
| * Protects in case close is called twice. |
| */ |
| private final AtomicBoolean m_closed = new AtomicBoolean(false); |
| |
| /** |
| * Our logger. |
| */ |
| private final Logger m_logger; |
| |
| /** |
| * The actual service. |
| */ |
| private volatile Object m_service; |
| |
| public ServiceEventImpl(ComponentContext ctx, ServiceReference<?> reference, Object service) { |
| super(service); |
| m_service = service; |
| m_bundle = ctx.getBundle(); |
| m_bundleContext = ctx.getBundleContext(); |
| m_reference = reference; |
| m_logger = ctx.getLogger(); |
| } |
| |
| /** |
| * Returns the actual service, or null if the service reference is invalid. |
| * @return the service or null if the service is not available anymore. |
| */ |
| @SuppressWarnings("unchecked") |
| @Override |
| public <T> T getEvent() { |
| if (m_service == null) { |
| try { |
| m_service = m_bundleContext.getService(m_reference); |
| if (m_service == null) { |
| debug(() -> "Service " + m_reference + " unavailable"); |
| } |
| } catch (Exception t) { |
| error(() -> "Could not get service from service reference " + m_reference, t); |
| } |
| } |
| return (T) m_service; |
| } |
| |
| /** |
| * Returns the bundle which has declared a service dependency. |
| */ |
| public Bundle getBundle() { |
| return m_bundle; |
| } |
| |
| /** |
| * Returns the context of the bundle which has declared a service dependency. |
| */ |
| public BundleContext getBundleContext() { |
| return m_bundleContext; |
| } |
| |
| /** |
| * Returns the reference service dependency. |
| */ |
| public ServiceReference<?> getReference() { |
| return m_reference; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public Dictionary<String, Object> getProperties() { |
| return ServiceUtil.propertiesToDictionary(m_reference); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof ServiceEventImpl) { |
| return getReference().equals(((ServiceEventImpl) obj).getReference()); |
| } |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| return getReference().hashCode(); |
| } |
| |
| @Override |
| public int compareTo(Event b) { |
| return getReference().compareTo(((ServiceEventImpl) b).getReference()); |
| } |
| |
| @Override |
| public String toString() { |
| return getEvent().toString(); |
| } |
| |
| @Override |
| public void close() { |
| if (m_closed.compareAndSet(false, true)) { |
| if (m_service != null) { |
| try { |
| m_bundleContext.ungetService(m_reference); |
| } catch (IllegalStateException e) {} |
| } |
| } |
| } |
| |
| private void error(Supplier<String> msg, Exception err) { |
| if (m_logger != null) { |
| m_logger.err("%s", err, msg.get()); |
| } |
| } |
| |
| private void debug(Supplier<String> msg) { |
| if (m_logger != null) { |
| m_logger.debug("%s", msg.get()); |
| } |
| } |
| } |