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.master.file.meta;
  
  import org.junit.rules.TestRule;
  import org.junit.runner.Description;
  import org.junit.runners.model.Statement;
  import org.powermock.reflect.Whitebox;
  
  /**
   * Rule for temporarily setting the TTL (time to live) checking interval.
   */
  public final class TtlIntervalRule implements TestRule {
    private final long mIntervalMs;
  
    /**
     * @param intervalMs the global checking interval (in ms) to temporarily set
     */
    public TtlIntervalRule(long intervalMs) {
      mIntervalMs = intervalMs;
    }
  
    @Override
    public Statement apply(final Statement statement, Description description) {
      return new Statement() {
        @Override
        public void evaluate() throws Throwable {
          long previousValue = TtlBucket.getTtlIntervalMs();
          Whitebox.setInternalState(TtlBucket.class, "sTtlIntervalMs", mIntervalMs);
          try {
            statement.evaluate();
          } finally {
            Whitebox.setInternalState(TtlBucket.class, "sTtlIntervalMs", previousValue);
          }
        }
      };
    }
  }
  