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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.configuration.Configuration;
import org.apache.flink.runtime.clusterframework.types.ResourceID;
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.MetricRegistry;
import org.apache.flink.runtime.metrics.groups.JobManagerMetricGroup;
import org.apache.flink.runtime.rpc.FatalErrorHandler;
import org.apache.flink.runtime.rpc.RpcService;
import org.apache.flink.util.AutoCloseableAsync;
import org.apache.flink.util.Preconditions;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.CompletableFuture;

/**
 * Simple {@link StandaloneResourceManager} runner. It instantiates the resource manager's services
 * and handles fatal errors by shutting the resource manager down.
 */
public class ResourceManagerRunner implements FatalErrorHandler, AutoCloseableAsync {

	private static final Logger LOG = LoggerFactory.getLogger(ResourceManagerRunner.class);

	private final Object lock = new Object();

	private final ResourceManagerRuntimeServices resourceManagerRuntimeServices;

	private final ResourceManager resourceManager;

	public ResourceManagerRunner(
			final ResourceID resourceId,
			final String resourceManagerEndpointId,
			final Configuration configuration,
			final RpcService rpcService,
			final HighAvailabilityServices highAvailabilityServices,
			final HeartbeatServices heartbeatServices,
			final MetricRegistry metricRegistry,
			final ClusterInformation clusterInformation,
			final JobManagerMetricGroup jobManagerMetricGroup) throws Exception {

		Preconditions.checkNotNull(resourceId);
		Preconditions.checkNotNull(configuration);
		Preconditions.checkNotNull(rpcService);
		Preconditions.checkNotNull(highAvailabilityServices);
		Preconditions.checkNotNull(heartbeatServices);
		Preconditions.checkNotNull(metricRegistry);

		final ResourceManagerRuntimeServicesConfiguration resourceManagerRuntimeServicesConfiguration = ResourceManagerRuntimeServicesConfiguration.fromConfiguration(configuration);

		resourceManagerRuntimeServices = ResourceManagerRuntimeServices.fromConfiguration(
			resourceManagerRuntimeServicesConfiguration,
			highAvailabilityServices,
			rpcService.getScheduledExecutor());

		this.resourceManager = new StandaloneResourceManager(
			rpcService,
			resourceManagerEndpointId,
			resourceId,
			highAvailabilityServices,
			heartbeatServices,
			resourceManagerRuntimeServices.getSlotManager(),
			metricRegistry,
			resourceManagerRuntimeServices.getJobLeaderIdService(),
			clusterInformation,
			this,
			jobManagerMetricGroup);
	}

	public ResourceManagerGateway getResourceManageGateway() {
		return resourceManager.getSelfGateway(ResourceManagerGateway.class);
	}

	//-------------------------------------------------------------------------------------
	// Lifecycle management
	//-------------------------------------------------------------------------------------

	public void start() throws Exception {
		resourceManager.start();
	}

	@Override
	public CompletableFuture closeAsync() {
		synchronized (lock) {
			resourceManager.shutDown();

			return resourceManager.getTerminationFuture();
		}
	}

	//-------------------------------------------------------------------------------------
	// Fatal error handler
	//-------------------------------------------------------------------------------------

	@Override
	public void onFatalError(Throwable exception) {
		LOG.error("Encountered fatal error.", exception);

		CompletableFuture shutdownFuture = closeAsync();

		shutdownFuture.whenComplete(
			(Void ignored, Throwable throwable) -> {
				if (throwable != null) {
					LOG.error("Could not properly shut down the resource manager runner.", throwable);
				}
			});
	}
}