| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed 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 com.android.telecomm; |
| |
| import android.content.ComponentName; |
| |
| import com.google.common.collect.Maps; |
| |
| import java.util.Collection; |
| import java.util.Map; |
| |
| /** |
| * Looks up, caches and returns binder services. Ensures that there is only one instance of a |
| * service per component. |
| */ |
| abstract class BaseRepository<ServiceClass extends ServiceBinder<?>> |
| implements ServiceBinder.Listener<ServiceClass> { |
| |
| /** |
| * Callback interface for notifying when a lookup has completed. |
| */ |
| interface LookupCallback<ServiceClass> { |
| void onComplete(Collection<ServiceClass> services); |
| } |
| |
| /** Map of cached services. */ |
| private final Map<ComponentName, ServiceClass> mServiceCache = Maps.newHashMap(); |
| |
| /** |
| * Removes the specified service from the cache when the service unbinds. |
| * |
| * {@inheritDoc} |
| */ |
| @Override |
| public void onUnbind(ServiceClass service) { |
| mServiceCache.remove(service.getComponentName()); |
| } |
| |
| /** |
| * Looks up service implementations. |
| * |
| * @param callback The callback on which to return execution when complete. |
| */ |
| final void lookupServices(final LookupCallback<ServiceClass> callback) { |
| onLookupServices(callback); |
| } |
| |
| /** |
| * Performs the grunt work of the lookup, to be implemented by the subclass. |
| * |
| * @param callback The callback on which to return execution when complete. |
| */ |
| protected abstract void onLookupServices(LookupCallback<ServiceClass> callback); |
| |
| /** |
| * Creates a new service implementation for the specified component. |
| * |
| * @param componentName The component name for the service. |
| * @param param Sub-class-provided parameter, see {@link #getService}. |
| */ |
| protected abstract ServiceClass onCreateNewServiceWrapper( |
| ComponentName componentName, Object param); |
| |
| /** |
| * Returns a cached implementation of the service. If no cached version exists, makes a |
| * request to the subclass for a new implementation which will then be cached and returned. |
| * |
| * @param componentName The component name for the service. |
| * @param param Sub-class-provided parameter. |
| */ |
| protected final ServiceClass getService(ComponentName componentName, Object param) { |
| ServiceClass service = mServiceCache.get(componentName); |
| if (service == null) { |
| service = onCreateNewServiceWrapper(componentName, param); |
| service.addListener(this); |
| mServiceCache.put(componentName, service); |
| } |
| return service; |
| } |
| } |