| /* |
| * |
| * 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.phoenix.util; |
| |
| /** |
| * Manages a singleton instance of the environment edge. This class shall |
| * implement static versions of the interface {@link EnvironmentEdge}, then |
| * defer to the delegate on invocation. |
| */ |
| public class EnvironmentEdgeManager { |
| private static volatile EnvironmentEdge delegate = new DefaultEnvironmentEdge(); |
| |
| private EnvironmentEdgeManager() { |
| |
| } |
| |
| /** |
| * Retrieves the singleton instance of the {@link EnvironmentEdge} that is |
| * being managed. |
| * |
| * @return the edge. |
| */ |
| public static EnvironmentEdge getDelegate() { |
| return delegate; |
| } |
| |
| /** |
| * Resets the managed instance to the default instance: {@link |
| * DefaultEnvironmentEdge}. |
| */ |
| public static void reset() { |
| injectEdge(new DefaultEnvironmentEdge()); |
| } |
| |
| /** |
| * Injects the given edge such that it becomes the managed entity. If null is |
| * passed to this method, the default type is assigned to the delegate. |
| * |
| * @param edge the new edge. |
| */ |
| public static void injectEdge(EnvironmentEdge edge) { |
| if (edge == null) { |
| reset(); |
| } else { |
| delegate = edge; |
| } |
| } |
| |
| /** |
| * Defers to the delegate and calls the |
| * {@link EnvironmentEdge#currentTime()} method. |
| * |
| * @return current time in millis according to the delegate. |
| */ |
| public static long currentTimeMillis() { |
| return getDelegate().currentTime(); |
| } |
| } |