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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.flink.runtime.heartbeat;

import org.apache.flink.runtime.clusterframework.types.ResourceID;
import org.apache.flink.runtime.concurrent.ScheduledExecutor;

import org.slf4j.Logger;

import java.util.concurrent.TimeUnit;

/**
 * {@link HeartbeatManager} implementation which regularly requests a heartbeat response from
 * its monitored {@link HeartbeatTarget}. The heartbeat period is configurable.
 *
 * @param  Type of the incoming heartbeat payload
 * @param  Type of the outgoing heartbeat payload
 */
public class HeartbeatManagerSenderImpl extends HeartbeatManagerImpl implements Runnable {

	private final long heartbeatPeriod;

	HeartbeatManagerSenderImpl(
			long heartbeatPeriod,
			long heartbeatTimeout,
			ResourceID ownResourceID,
			HeartbeatListener heartbeatListener,
			ScheduledExecutor mainThreadExecutor,
			Logger log) {
		this(
			heartbeatPeriod,
			heartbeatTimeout,
			ownResourceID,
			heartbeatListener,
			mainThreadExecutor,
			log,
			new HeartbeatMonitorImpl.Factory<>());
	}

	HeartbeatManagerSenderImpl(
			long heartbeatPeriod,
			long heartbeatTimeout,
			ResourceID ownResourceID,
			HeartbeatListener heartbeatListener,
			ScheduledExecutor mainThreadExecutor,
			Logger log,
			HeartbeatMonitor.Factory heartbeatMonitorFactory) {
		super(
			heartbeatTimeout,
			ownResourceID,
			heartbeatListener,
			mainThreadExecutor,
			log,
			heartbeatMonitorFactory);

		this.heartbeatPeriod = heartbeatPeriod;
		mainThreadExecutor.schedule(this, 0L, TimeUnit.MILLISECONDS);
	}

	@Override
	public void run() {
		if (!stopped) {
			log.debug("Trigger heartbeat request.");
			for (HeartbeatMonitor heartbeatMonitor : getHeartbeatTargets().values()) {
				requestHeartbeat(heartbeatMonitor);
			}

			getMainThreadExecutor().schedule(this, heartbeatPeriod, TimeUnit.MILLISECONDS);
		}
	}

	private void requestHeartbeat(HeartbeatMonitor heartbeatMonitor) {
		O payload = getHeartbeatListener().retrievePayload(heartbeatMonitor.getHeartbeatTargetId());
		final HeartbeatTarget heartbeatTarget = heartbeatMonitor.getHeartbeatTarget();

		heartbeatTarget.requestHeartbeat(getOwnResourceID(), payload);
	}
}