| /** |
| * |
| * 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.xbean.recipe; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map; |
| |
| public abstract class ExecutionContext { |
| private static final ThreadLocal<ExecutionContext> context = new ThreadLocal<ExecutionContext>(); |
| |
| public static boolean isContextSet() { |
| return context.get() != null; |
| } |
| |
| public static ExecutionContext getContext() { |
| ExecutionContext executionContext = context.get(); |
| if (executionContext == null) { |
| throw new IllegalStateException("Execution context has not been set"); |
| } |
| return executionContext; |
| } |
| |
| public static ExecutionContext setContext(ExecutionContext newContext) { |
| ExecutionContext oldContext = context.get(); |
| context.set(newContext); |
| return oldContext; |
| } |
| |
| /** |
| * Adds a recipe to the top of the execution stack. If the recipe is already on |
| * the stack, a CircularDependencyException is thrown. |
| * @param recipe the recipe to add to the stack |
| * @throws CircularDependencyException if the recipe is already on the stack |
| */ |
| public abstract void push(Recipe recipe) throws CircularDependencyException; |
| |
| /** |
| * Removes the top recipe from the execution stack. |
| * @return the top recipe on the stack |
| */ |
| public abstract Recipe pop(); |
| |
| /** |
| * Gets a snapshot of the current execution stack. The returned list is |
| * a snapshot so any modification of the returned list does not modify |
| * the stack contained in this object. |
| * @return a snapshot of the current execution stack |
| */ |
| public abstract LinkedList<Recipe> getStack(); |
| |
| /** |
| * Does this context contain a object with the specified name. |
| * |
| * @param name the unique name of the object instance |
| * @return true if this context contain a object with the specified name |
| */ |
| public abstract boolean containsObject(String name); |
| |
| /** |
| * Gets the object or recipe with the specified name from the repository. |
| * |
| * @param name the unique name of the object instance |
| * @return the object instance, a recipe to build the object or null |
| */ |
| public abstract Object getObject(String name); |
| |
| /** |
| * Add an object to the repository. |
| * |
| * @param name the unique name of the object instance |
| * @param object the object instance |
| * @throws ConstructionException if another object instance is already registered with the name |
| */ |
| public abstract void addObject(String name, Object object); |
| |
| /** |
| * Adds a reference to an object to this context. If an object is already registered under |
| * the referenced name, the reference will immedately be set. Otherwise, the reference will be set |
| * when an object is added with the referenced name. |
| * |
| * @param reference the reference to set |
| */ |
| public abstract void addReference(Reference reference); |
| |
| /** |
| * Gets the unresolved references by name. |
| * |
| * @return the unresolved references by name |
| */ |
| public abstract Map<String, List<Reference>> getUnresolvedRefs(); |
| |
| /** |
| * Gets the class loader used for loading of all classes during the |
| * life of this execution context |
| * @return the class loader for loading classes in this context |
| */ |
| public abstract ClassLoader getClassLoader(); |
| } |