NoOpHeartbeatPublisher.java

/*
 * Copyright © 2015 Cask Data, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package co.cask.cdap.data.stream.service.heartbeat;

import com.google.common.util.concurrent.AbstractIdleService;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;

/**
 * No-op implementation, to remove once notifications are here.
 */
public class NoOpHeartbeatPublisher extends AbstractIdleService implements HeartbeatPublisher {

  @Override
  protected void startUp() throws Exception {
    // No-op
  }

  @Override
  protected void shutDown() throws Exception {
    // No-op
  }

  @Override
  public ListenableFuture<StreamWriterHeartbeat> sendHeartbeat(StreamWriterHeartbeat heartbeat) {
    return Futures.immediateFuture(heartbeat);
  }
}