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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.jobmaster;

import org.apache.flink.api.common.time.Time;
import org.apache.flink.configuration.ConfigConstants;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.configuration.IllegalConfigurationException;
import org.apache.flink.runtime.akka.AkkaUtils;
import org.apache.flink.runtime.blob.BlobServer;
import org.apache.flink.runtime.execution.librarycache.BlobLibraryCacheManager;
import org.apache.flink.runtime.executiongraph.restart.RestartStrategyFactory;
import org.apache.flink.runtime.highavailability.HighAvailabilityServices;
import org.apache.flink.runtime.util.ExecutorThreadFactory;
import org.apache.flink.runtime.util.Hardware;
import org.apache.flink.util.ExceptionUtils;

import scala.concurrent.duration.FiniteDuration;

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;

import static org.apache.flink.util.Preconditions.checkNotNull;

/**
 * Utility class to hold all auxiliary services used by the {@link JobMaster}.
 */
public class JobManagerServices {

	public final ScheduledExecutorService executorService;

	public final BlobLibraryCacheManager libraryCacheManager;

	public final RestartStrategyFactory restartStrategyFactory;

	public final Time rpcAskTimeout;

	public JobManagerServices(
			ScheduledExecutorService executorService,
			BlobLibraryCacheManager libraryCacheManager,
			RestartStrategyFactory restartStrategyFactory,
			Time rpcAskTimeout) {

		this.executorService = checkNotNull(executorService);
		this.libraryCacheManager = checkNotNull(libraryCacheManager);
		this.restartStrategyFactory = checkNotNull(restartStrategyFactory);
		this.rpcAskTimeout = checkNotNull(rpcAskTimeout);
	}

	/**
	 * 
	 * This method makes sure all services are closed or shut down, even when an exception occurred
	 * in the shutdown of one component. The first encountered exception is thrown, with successive
	 * exceptions added as suppressed exceptions.
	 * 
	 * @throws Exception The first Exception encountered during shutdown.
	 */
	public void shutdown() throws Exception {
		Throwable firstException = null;

		try {
			executorService.shutdownNow();
		} catch (Throwable t) {
			firstException = t;
		}

		try {
			libraryCacheManager.shutdown();
		}
		catch (Throwable t) {
			if (firstException == null) {
				firstException = t;
			} else {
				firstException.addSuppressed(t);
			}
		}

		if (firstException != null) {
			ExceptionUtils.rethrowException(firstException, "Error while shutting down JobManager services");
		}
	}

	// ------------------------------------------------------------------------
	//  Creating the components from a configuration 
	// ------------------------------------------------------------------------
	

	public static JobManagerServices fromConfiguration(
			Configuration config,
			HighAvailabilityServices haServices) throws Exception {

		final BlobServer blobServer = new BlobServer(config, haServices.createBlobStore());

		final long cleanupInterval = config.getLong(
			ConfigConstants.LIBRARY_CACHE_MANAGER_CLEANUP_INTERVAL,
			ConfigConstants.DEFAULT_LIBRARY_CACHE_MANAGER_CLEANUP_INTERVAL) * 1000;

		final BlobLibraryCacheManager libraryCacheManager = new BlobLibraryCacheManager(blobServer, cleanupInterval);

		final FiniteDuration timeout;
		try {
			timeout = AkkaUtils.getTimeout(config);
		} catch (NumberFormatException e) {
			throw new IllegalConfigurationException(AkkaUtils.formatDurationParingErrorMessage());
		}

		final ScheduledExecutorService futureExecutor = Executors.newScheduledThreadPool(
				Hardware.getNumberCPUCores(),
				new ExecutorThreadFactory("jobmanager-future"));

		return new JobManagerServices(
			futureExecutor,
			libraryCacheManager,
			RestartStrategyFactory.createRestartStrategyFactory(config),
			Time.of(timeout.length(), timeout.unit()));
	}
}