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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.resourcemanager;

import org.apache.flink.api.common.time.Time;
import org.apache.flink.runtime.clusterframework.ApplicationStatus;
import org.apache.flink.runtime.clusterframework.types.ResourceID;
import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
import org.apache.flink.runtime.entrypoint.ClusterInformation;
import org.apache.flink.runtime.heartbeat.HeartbeatServices;
import org.apache.flink.runtime.highavailability.HighAvailabilityServices;
import org.apache.flink.runtime.metrics.groups.ResourceManagerMetricGroup;
import org.apache.flink.runtime.resourcemanager.exceptions.ResourceManagerException;
import org.apache.flink.runtime.resourcemanager.slotmanager.SlotManager;
import org.apache.flink.runtime.rpc.FatalErrorHandler;
import org.apache.flink.runtime.rpc.RpcService;
import org.apache.flink.util.Preconditions;

import javax.annotation.Nullable;

import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.TimeUnit;

/**
 * A standalone implementation of the resource manager. Used when the system is started in
 * standalone mode (via scripts), rather than via a resource framework like YARN or Mesos.
 *
 * This ResourceManager doesn't acquire new resources.
 */
public class StandaloneResourceManager extends ResourceManager {

	/** The duration of the startup period. A duration of zero means there is no startup period. */
	private final Time startupPeriodTime;

	public StandaloneResourceManager(
			RpcService rpcService,
			String resourceManagerEndpointId,
			ResourceID resourceId,
			HighAvailabilityServices highAvailabilityServices,
			HeartbeatServices heartbeatServices,
			SlotManager slotManager,
			JobLeaderIdService jobLeaderIdService,
			ClusterInformation clusterInformation,
			FatalErrorHandler fatalErrorHandler,
			ResourceManagerMetricGroup resourceManagerMetricGroup,
			Time startupPeriodTime) {
		super(
			rpcService,
			resourceManagerEndpointId,
			resourceId,
			highAvailabilityServices,
			heartbeatServices,
			slotManager,
			jobLeaderIdService,
			clusterInformation,
			fatalErrorHandler,
			resourceManagerMetricGroup);
		this.startupPeriodTime = Preconditions.checkNotNull(startupPeriodTime);
	}

	@Override
	protected void initialize() throws ResourceManagerException {
		// nothing to initialize
	}

	@Override
	protected void internalDeregisterApplication(ApplicationStatus finalStatus, @Nullable String diagnostics) {
	}

	@Override
	public Collection startNewWorker(ResourceProfile resourceProfile) {
		return Collections.emptyList();
	}

	@Override
	public boolean stopWorker(ResourceID resourceID) {
		// standalone resource manager cannot stop workers
		return false;
	}

	@Override
	protected ResourceID workerStarted(ResourceID resourceID) {
		return resourceID;
	}

	@Override
	protected void startServicesOnLeadership() {
		super.startServicesOnLeadership();
		startStartupPeriod();
	}

	private void startStartupPeriod() {
		setFailUnfulfillableRequest(false);

		final long startupPeriodMillis = startupPeriodTime.toMilliseconds();

		if (startupPeriodMillis > 0) {
			scheduleRunAsync(
				() -> setFailUnfulfillableRequest(true),
				startupPeriodMillis,
				TimeUnit.MILLISECONDS
			);
		}
	}
}