| 1 | /** |
| 2 | * |
| 3 | * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com> |
| 4 | * |
| 5 | * ==================================================================== |
| 6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | * you may not use this file except in compliance with the License. |
| 8 | * You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, software |
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | * See the License for the specific language governing permissions and |
| 16 | * limitations under the License. |
| 17 | * ==================================================================== |
| 18 | */ |
| 19 | package org.jclouds.rest.config; |
| 20 | |
| 21 | import java.util.Map; |
| 22 | import java.util.concurrent.ConcurrentMap; |
| 23 | |
| 24 | import javax.inject.Inject; |
| 25 | import javax.inject.Singleton; |
| 26 | |
| 27 | import org.jclouds.concurrent.internal.SyncProxy; |
| 28 | import org.jclouds.internal.ClassMethodArgs; |
| 29 | |
| 30 | import com.google.common.base.Throwables; |
| 31 | import com.google.inject.Injector; |
| 32 | import com.google.inject.Key; |
| 33 | import com.google.inject.Provider; |
| 34 | import com.google.inject.TypeLiteral; |
| 35 | import com.google.inject.name.Names; |
| 36 | |
| 37 | /** |
| 38 | * |
| 39 | * @author Adrian Cole |
| 40 | */ |
| 41 | @Singleton |
| 42 | public class ClientProvider<S, A> implements Provider<S> { |
| 43 | @Inject |
| 44 | Injector injector; |
| 45 | private final Class<S> syncClientType; |
| 46 | private final Class<A> asyncClientType; |
| 47 | private final Map<Class<?>, Class<?>> sync2Async; |
| 48 | |
| 49 | @Inject |
| 50 | ClientProvider(Class<S> syncClientType, Class<A> asyncClientType, |
| 51 | Map<Class<?>, Class<?>> sync2Async) { |
| 52 | this.asyncClientType = asyncClientType; |
| 53 | this.syncClientType = syncClientType; |
| 54 | this.sync2Async = sync2Async; |
| 55 | } |
| 56 | |
| 57 | @Override |
| 58 | @Singleton |
| 59 | public S get() { |
| 60 | A client = (A) injector.getInstance(Key.get(asyncClientType)); |
| 61 | ConcurrentMap<ClassMethodArgs, Object> delegateMap = injector.getInstance(Key.get( |
| 62 | new TypeLiteral<ConcurrentMap<ClassMethodArgs, Object>>() { |
| 63 | }, Names.named("sync"))); |
| 64 | try { |
| 65 | return (S) SyncProxy.proxy(syncClientType, new SyncProxy(syncClientType, client, |
| 66 | delegateMap, sync2Async)); |
| 67 | } catch (Exception e) { |
| 68 | Throwables.propagate(e); |
| 69 | assert false : "should have propagated"; |
| 70 | return null; |
| 71 | } |
| 72 | } |
| 73 | } |