| /* |
| * 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.sling.testing.junit.rules; |
| |
| import org.junit.rules.TestRule; |
| import org.junit.runner.Description; |
| import org.junit.runners.model.Statement; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| /** |
| * Allows wrapping a junit {@link TestRule} that will be run only once. |
| * Once means once per class RunOnceRule being loaded |
| */ |
| public class RunOnceRule implements TestRule { |
| private static final Logger LOG = LoggerFactory.getLogger(RunOnceRule.class); |
| private static AtomicBoolean run = new AtomicBoolean(false); |
| private final TestRule rule; |
| |
| /** |
| * Constructor* |
| * @param rule The rule to wrap and run once per classloader load |
| * @param <T> The class of the TestRule |
| */ |
| public <T extends TestRule> RunOnceRule(T rule) { |
| this.rule = rule; |
| } |
| |
| @Override |
| public Statement apply(final Statement base, final Description description) { |
| // if not done yet |
| if (!RunOnceRule.run.getAndSet(true)) { |
| LOG.debug("Applying {} once", rule.getClass()); |
| return rule.apply(base, description); |
| } else { |
| return base; |
| } |
| } |
| } |