content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.job.plan;
  
  import alluxio.AlluxioMockUtil;
  import alluxio.job.JobConfig;
  
  import org.junit.rules.TestRule;
  import org.junit.runner.Description;
  import org.junit.runners.model.Statement;
  
  import java.util.Map;
  
  /**
   * Rule for adding to the job registry and then cleaning up the change.
   */
  public final class PlanDefinitionRegistryRule implements TestRule {
    private Class<? extends JobConfig> mConfig;
    private PlanDefinition<?, ?, ?> mDefinition;
  
    /**
     * @param keyValuePairs map from configuration keys to the values to set them to
     */
    public PlanDefinitionRegistryRule(Class<? extends JobConfig> config,
                                      PlanDefinition<?, ?, ?> definition) {
      mConfig = config;
      mDefinition = definition;
    }
  
    @Override
    public Statement apply(final Statement statement, Description description) {
      return new Statement() {
        @Override
        public void evaluate() throws Throwable {
          @SuppressWarnings("unchecked")
          Map<Class<?>, PlanDefinition<?, ?, ?>> registry =
              AlluxioMockUtil.getInternalState(PlanDefinitionRegistry.INSTANCE, "mDefinitions");
          registry.put(mConfig, mDefinition);
          try {
            statement.evaluate();
          } finally {
            registry.remove(mConfig);
          }
        }
      };
    }
  }
  