| 1 | /** |
| 2 | * Licensed to jclouds, Inc. (jclouds) under one or more |
| 3 | * contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. jclouds licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. 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, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
| 19 | package org.jclouds.rest.config; |
| 20 | |
| 21 | import static com.google.common.base.Preconditions.checkState; |
| 22 | |
| 23 | import java.util.Map; |
| 24 | import java.util.concurrent.ExecutionException; |
| 25 | |
| 26 | import javax.inject.Inject; |
| 27 | import javax.inject.Named; |
| 28 | import javax.inject.Provider; |
| 29 | |
| 30 | import com.google.inject.Injector; |
| 31 | import com.google.inject.Key; |
| 32 | import com.google.inject.TypeLiteral; |
| 33 | import com.google.inject.name.Names; |
| 34 | import org.jclouds.concurrent.internal.SyncProxy; |
| 35 | import org.jclouds.internal.ClassMethodArgs; |
| 36 | |
| 37 | import com.google.common.base.Throwables; |
| 38 | import com.google.common.cache.Cache; |
| 39 | import com.google.common.cache.CacheLoader; |
| 40 | |
| 41 | /** |
| 42 | * CreateClientForCaller is parameterized, so clients it creates aren't singletons. For example, |
| 43 | * CreateClientForCaller satisfies a call like this: |
| 44 | * {@code context.getProviderSpecificContext().getApi().getOrgClientForName(name)} |
| 45 | * |
| 46 | * @author Adrian Cole |
| 47 | */ |
| 48 | public class CreateClientForCaller extends CacheLoader<ClassMethodArgs, Object> { |
| 49 | @Inject |
| 50 | Injector injector; |
| 51 | private final Cache<ClassMethodArgs, Object> asyncMap; |
| 52 | private final Provider<Cache<ClassMethodArgs, Object>> delegateMap; |
| 53 | Map<Class<?>, Class<?>> sync2Async; |
| 54 | |
| 55 | @Inject |
| 56 | CreateClientForCaller(@Named("async") Cache<ClassMethodArgs, Object> asyncMap, |
| 57 | @Named("sync") Provider<Cache<ClassMethodArgs, Object>> delegateMap) { |
| 58 | this.asyncMap = asyncMap; |
| 59 | this.delegateMap = delegateMap; |
| 60 | } |
| 61 | |
| 62 | @Override |
| 63 | public Object load(ClassMethodArgs from) throws ExecutionException { |
| 64 | Class<?> syncClass = from.getMethod().getReturnType(); |
| 65 | Class<?> asyncClass = sync2Async.get(syncClass); |
| 66 | checkState(asyncClass != null, "configuration error, sync class " + syncClass + " not mapped to an async class"); |
| 67 | Object asyncClient = asyncMap.get(from); |
| 68 | checkState(asyncClient != null, "configuration error, sync client for " + from + " not found"); |
| 69 | try { |
| 70 | return SyncProxy.proxy(syncClass, asyncClient, delegateMap.get(), sync2Async, |
| 71 | injector.getInstance(Key.get(new TypeLiteral<Map<String, Long>>() { |
| 72 | }, Names.named("TIMEOUTS")))); |
| 73 | } catch (Exception e) { |
| 74 | Throwables.propagate(e); |
| 75 | assert false : "should have propagated"; |
| 76 | return null; |
| 77 | } |
| 78 | |
| 79 | } |
| 80 | } |