| /* |
| * Copyright 2000-2012 JetBrains s.r.o. |
| * |
| * 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 org.jetbrains.jps.service.impl; |
| |
| import org.jetbrains.jps.plugin.JpsPluginManager; |
| import org.jetbrains.jps.service.JpsServiceManager; |
| |
| import java.util.*; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * @author nik |
| */ |
| public class JpsServiceManagerImpl extends JpsServiceManager { |
| private final ConcurrentHashMap<Class, Object> myServices = new ConcurrentHashMap<Class, Object>(16, 0.75f, 1); |
| private final ConcurrentHashMap<Class, List<?>> myExtensions = new ConcurrentHashMap<Class, List<?>>(16, 0.75f, 1); |
| |
| @Override |
| public <T> T getService(Class<T> serviceClass) { |
| //noinspection unchecked |
| T service = (T)myServices.get(serviceClass); |
| if (service == null) { |
| final Iterator<T> iterator = ServiceLoader.load(serviceClass, serviceClass.getClassLoader()).iterator(); |
| if (!iterator.hasNext()) { |
| throw new ServiceConfigurationError("Implementation for " + serviceClass + " not found"); |
| } |
| final T loadedService = iterator.next(); |
| if (iterator.hasNext()) { |
| throw new ServiceConfigurationError( |
| "More than one implementation for " + serviceClass + " found: " + loadedService.getClass() + " and " + iterator.next().getClass()); |
| } |
| //noinspection unchecked |
| service = (T)myServices.putIfAbsent(serviceClass, loadedService); |
| if (service == null) { |
| service = loadedService; |
| } |
| } |
| return service; |
| } |
| |
| @Override |
| public <T> Iterable<T> getExtensions(Class<T> extensionClass) { |
| List<?> cached = myExtensions.get(extensionClass); |
| if (cached == null) { |
| final List<T> extensions = new ArrayList<T>(JpsPluginManager.getInstance().loadExtensions(extensionClass)); |
| cached = myExtensions.putIfAbsent(extensionClass, extensions); |
| if (cached == null) { |
| cached = extensions; |
| } |
| } |
| //noinspection unchecked |
| return (List<T>)cached; |
| } |
| } |