| 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.lifecycle.config; |
| 20 | |
| 21 | import static com.google.inject.matcher.Matchers.any; |
| 22 | |
| 23 | import java.io.Closeable; |
| 24 | import java.io.IOException; |
| 25 | import java.lang.reflect.InvocationTargetException; |
| 26 | import java.lang.reflect.Method; |
| 27 | import java.util.Arrays; |
| 28 | import java.util.HashSet; |
| 29 | import java.util.Set; |
| 30 | import java.util.concurrent.ExecutorService; |
| 31 | |
| 32 | import javax.annotation.PostConstruct; |
| 33 | import javax.annotation.PreDestroy; |
| 34 | import javax.inject.Inject; |
| 35 | import javax.inject.Named; |
| 36 | |
| 37 | import org.jclouds.Constants; |
| 38 | import org.jclouds.lifecycle.Closer; |
| 39 | |
| 40 | import com.google.inject.AbstractModule; |
| 41 | import com.google.inject.ProvisionException; |
| 42 | import com.google.inject.TypeLiteral; |
| 43 | import com.google.inject.spi.InjectionListener; |
| 44 | import com.google.inject.spi.TypeEncounter; |
| 45 | import com.google.inject.spi.TypeListener; |
| 46 | |
| 47 | /** |
| 48 | * This associates java lifecycle annotations with guice hooks. For example, we invoke |
| 49 | * {@link PostConstruct} after injection, and Associate {@link PreDestroy} with a global |
| 50 | * {@link Closer} object. |
| 51 | * |
| 52 | * @author Adrian Cole |
| 53 | */ |
| 54 | public class LifeCycleModule extends AbstractModule { |
| 55 | |
| 56 | protected void configure() { |
| 57 | |
| 58 | Closeable executorCloser = new Closeable() { |
| 59 | @Inject |
| 60 | @Named(Constants.PROPERTY_USER_THREADS) |
| 61 | ExecutorService userExecutor; |
| 62 | @Inject |
| 63 | @Named(Constants.PROPERTY_IO_WORKER_THREADS) |
| 64 | ExecutorService ioExecutor; |
| 65 | |
| 66 | public void close() throws IOException { |
| 67 | assert userExecutor != null; |
| 68 | userExecutor.shutdownNow(); |
| 69 | assert ioExecutor != null; |
| 70 | ioExecutor.shutdownNow(); |
| 71 | } |
| 72 | }; |
| 73 | |
| 74 | binder().requestInjection(executorCloser); |
| 75 | Closer closer = new Closer(); |
| 76 | closer.addToClose(executorCloser); |
| 77 | bind(Closer.class).toInstance(closer); |
| 78 | bindPostInjectionInvoke(closer); |
| 79 | } |
| 80 | |
| 81 | protected void bindPostInjectionInvoke(final Closer closer) { |
| 82 | bindListener(any(), new TypeListener() { |
| 83 | public <I> void hear(TypeLiteral<I> injectableType, TypeEncounter<I> encounter) { |
| 84 | Set<Method> methods = new HashSet<Method>(); |
| 85 | Class<? super I> type = injectableType.getRawType(); |
| 86 | while (type != null) { |
| 87 | methods.addAll(Arrays.asList(type.getDeclaredMethods())); |
| 88 | type = type.getSuperclass(); |
| 89 | } |
| 90 | for (final Method method : methods) { |
| 91 | invokePostConstructMethodAfterInjection(encounter, method); |
| 92 | associatePreDestroyWithCloser(closer, encounter, method); |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | private <I> void associatePreDestroyWithCloser(final Closer closer, |
| 97 | TypeEncounter<I> encounter, final Method method) { |
| 98 | PreDestroy preDestroy = method.getAnnotation(PreDestroy.class); |
| 99 | if (preDestroy != null) { |
| 100 | encounter.register(new InjectionListener<I>() { |
| 101 | public void afterInjection(final I injectee) { |
| 102 | closer.addToClose(new Closeable() { |
| 103 | public void close() throws IOException { |
| 104 | try { |
| 105 | method.invoke(injectee); |
| 106 | } catch (InvocationTargetException ie) { |
| 107 | Throwable e = ie.getTargetException(); |
| 108 | throw new IOException(e.getMessage()); |
| 109 | } catch (IllegalAccessException e) { |
| 110 | throw new IOException(e.getMessage()); |
| 111 | } |
| 112 | } |
| 113 | }); |
| 114 | |
| 115 | } |
| 116 | }); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | private <I> void invokePostConstructMethodAfterInjection(TypeEncounter<I> encounter, |
| 121 | final Method method) { |
| 122 | PostConstruct postConstruct = method.getAnnotation(PostConstruct.class); |
| 123 | if (postConstruct != null) { |
| 124 | encounter.register(new InjectionListener<I>() { |
| 125 | public void afterInjection(I injectee) { |
| 126 | try { |
| 127 | method.invoke(injectee); |
| 128 | } catch (InvocationTargetException ie) { |
| 129 | Throwable e = ie.getTargetException(); |
| 130 | throw new ProvisionException(e.getMessage(), e); |
| 131 | } catch (IllegalAccessException e) { |
| 132 | throw new ProvisionException(e.getMessage(), e); |
| 133 | } |
| 134 | } |
| 135 | }); |
| 136 | } |
| 137 | } |
| 138 | }); |
| 139 | } |
| 140 | |
| 141 | } |