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.backup;
  
  import alluxio.grpc.BackupPStatus;
  import alluxio.wire.BackupStatus;
  
  import com.google.common.base.MoreObjects;
  import io.atomix.catalyst.buffer.BufferInput;
  import io.atomix.catalyst.buffer.BufferOutput;
  import io.atomix.catalyst.serializer.CatalystSerializable;
  import io.atomix.catalyst.serializer.Serializer;
  
  import javax.annotation.Nullable;
  
  /**
   * The backup message used for sending status of current backup to leader.
   */
  public class BackupHeartbeatMessage implements CatalystSerializable {
    /** Current backup status. */
    private BackupStatus mBackupStatus;
  
    /**
     * Empty constructor as per deserialization requirement.
     */
    public BackupHeartbeatMessage() {
      mBackupStatus = null;
    }
  
    /**
     * Creates a heartbeat message with given backup status.
     *
     * @param backupStatus the backup status
     */
    public BackupHeartbeatMessage(@Nullable BackupStatus backupStatus) {
      mBackupStatus = backupStatus;
    }
  
    /**
     * @return the nullable {@link BackupStatus} in this heartbeat
     */
    public BackupStatus getBackupStatus() {
      return mBackupStatus;
    }
  
    @Override
    public void writeObject(BufferOutput<?> bufferOutput, Serializer serializer) {
      if (mBackupStatus == null) {
        bufferOutput.writeBoolean(false);
        return;
      }
  
      // Leverage {@link BackupStatus#toProto} for serialization.
      byte[] statusBytes = mBackupStatus.toProto().toByteArray();
      bufferOutput.writeBoolean(true);
      bufferOutput.writeInt(statusBytes.length);
      bufferOutput.writeBytes(statusBytes);
    }
  
    @Override
    public void readObject(BufferInput<?> bufferInput, Serializer serializer) {
      if (bufferInput.readBoolean()) {
        // Leverage {@link BackupStatus#fromProto} for deserialization.
        int statusBytesLen = bufferInput.readInt();
        byte[] statusBytes = bufferInput.readBytes(statusBytesLen);
        try {
          mBackupStatus = BackupStatus.fromProto(BackupPStatus.parseFrom(statusBytes));
        } catch (Exception e) {
          throw new RuntimeException("Failed to deserialize BackupStatus message.", e);
        }
      }
    }
  
    @Override
    public String toString() {
      return MoreObjects.toStringHelper(this)
          .add("BackupStatus", mBackupStatus)
          .toString();
    }
  }
  