| /** |
| * 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.falcon.util; |
| |
| import org.apache.falcon.FalconException; |
| |
| import java.util.Properties; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| /** |
| * Application build info properties are exposed through this. |
| */ |
| public final class BuildProperties extends ApplicationProperties { |
| private static final String PROPERTY_FILE = "falcon-buildinfo.properties"; |
| |
| private static final AtomicReference<BuildProperties> INSTANCE = |
| new AtomicReference<BuildProperties>(); |
| |
| private BuildProperties() throws FalconException { |
| super(); |
| } |
| |
| @Override |
| protected String getPropertyFile() { |
| return PROPERTY_FILE; |
| } |
| |
| public static Properties get() { |
| try { |
| if (INSTANCE.get() == null) { |
| INSTANCE.compareAndSet(null, new BuildProperties()); |
| } |
| return INSTANCE.get(); |
| } catch (FalconException e) { |
| throw new RuntimeException("Unable to read application " |
| + "falcon build information properties", e); |
| } |
| } |
| } |