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;
  
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.fail;
  
  import org.junit.After;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  
  import java.io.Closeable;
  
  /**
   * Tests for {@link PortReservationRule}.
   */
  public final class PortReservationRuleTest {
    @Rule
    public ExpectedException mThrown = ExpectedException.none();
  
    @After
    public void after() {
      PortRegistry.clear();
    }
  
    @Test
    public void basic() throws Exception {
      PortReservationRule rule = new PortReservationRule();
      for (int attempt = 0; attempt < 20; attempt++) {
        int port;
        try (Closeable c = rule.toResource()) {
          port = rule.getPort();
          assertFalse("Port should be locked, so we cannot re-lock",
              PortRegistry.INSTANCE.lockPort(port));
        }
        if (PortRegistry.INSTANCE.lockPort(port)) {
          // Successfully locked after closing the rule.
          return;
        }
        // Another process could have taken the port, retry.
      }
      fail("Failed to lock port after closing the port rule");
    }
  
    @Test
    public void invalidGetPort() {
      PortReservationRule rule = new PortReservationRule();
      mThrown.expect(IllegalStateException.class);
      rule.getPort();
    }
  }
  