| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.ambari.metrics.adservice.app |
| |
| import java.lang.annotation.Annotation |
| |
| import com.google.inject.{Guice, Injector, Module, TypeLiteral} |
| |
| import scala.collection.JavaConversions._ |
| import scala.language.implicitConversions |
| import scala.reflect._ |
| |
| object GuiceInjector { |
| |
| def withInjector(modules: Module*)(fn: (Injector) => Unit) = { |
| val injector = Guice.createInjector(modules.toList: _*) |
| fn(injector) |
| } |
| |
| implicit def wrap(injector: Injector): InjectorWrapper = new InjectorWrapper(injector) |
| } |
| |
| class InjectorWrapper(injector: Injector) { |
| def instancesWithAnnotation[T <: Annotation](annotationClass: Class[T]): List[AnyRef] = { |
| injector.getAllBindings.filter { case (k, v) => |
| !k.getTypeLiteral.getRawType.getAnnotationsByType[T](annotationClass).isEmpty |
| }.map { case (k, v) => injector.getInstance(k).asInstanceOf[AnyRef] }.toList |
| } |
| |
| def instancesOfType[T: ClassTag](typeClass: Class[T]): List[T] = { |
| injector.findBindingsByType(TypeLiteral.get(classTag[T].runtimeClass)).map { b => |
| injector.getInstance(b.getKey).asInstanceOf[T] |
| }.toList |
| } |
| |
| def dumpBindings(): Unit = { |
| injector.getBindings.keySet() foreach { k => |
| println(s"bind key = ${k.toString}") |
| } |
| } |
| } |