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.worker.block;
  
  import alluxio.exception.FailedToAcquireRegisterLeaseException;
  import alluxio.exception.runtime.UnavailableRuntimeException;
  
  import com.google.common.annotations.VisibleForTesting;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.util.concurrent.atomic.AtomicInteger;
  import javax.annotation.concurrent.NotThreadSafe;
  
  /**
   * A test {@link SpecificMasterBlockSync} that adds some interfaces for testing.
   */
  @NotThreadSafe
  @VisibleForTesting
  public final class TestSpecificMasterBlockSync extends SpecificMasterBlockSync {
    private static final Logger LOG = LoggerFactory.getLogger(TestSpecificMasterBlockSync.class);
    private volatile boolean mFailHeartbeat = false;
    private final AtomicInteger mRegistrationSuccessCount = new AtomicInteger(0);
  
    /**
     * Creates a new instance of {@link SpecificMasterBlockSync}.
     *
     * @param blockWorker the {@link BlockWorker} this syncer is updating to
     * @param masterClient the block master client
     * @param heartbeatReporter the heartbeat reporter
     */
    public TestSpecificMasterBlockSync(
        BlockWorker blockWorker, BlockMasterClient masterClient,
        BlockHeartbeatReporter heartbeatReporter) throws IOException {
      super(blockWorker, masterClient, heartbeatReporter);
    }
  
    /**
     * Restores the heartbeat.
     */
    public void restoreHeartbeat() {
      mFailHeartbeat = false;
    }
  
    /**
     * Fails the heartbeat and lets it throws an exception.
     */
    public void failHeartbeat() {
      mFailHeartbeat = true;
    }
  
    /**
     * @return registration success count
     */
    public int getRegistrationSuccessCount() {
      return mRegistrationSuccessCount.get();
    }
  
    @Override
    protected void registerWithMasterInternal()
        throws IOException, FailedToAcquireRegisterLeaseException {
      super.registerWithMasterInternal();
      mRegistrationSuccessCount.incrementAndGet();
    }
  
    @Override
    protected void beforeHeartbeat() {
      if (mFailHeartbeat) {
        throw new UnavailableRuntimeException("Heartbeat paused");
      }
    }
  }
  