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Scheduler services for QWAZR
There is a newer version: 1.5.0
/*
 * Copyright 2015-2018 Emmanuel Keller / QWAZR
 * 
 * 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 com.qwazr.scheduler;

import com.qwazr.cluster.ClusterManager;
import com.qwazr.cluster.ClusterServiceInterface;
import com.qwazr.library.LibraryManager;
import com.qwazr.library.LibraryServiceInterface;
import com.qwazr.scripts.ScriptManager;
import com.qwazr.scripts.ScriptServiceBuilder;
import com.qwazr.scripts.ScriptServiceInterface;
import com.qwazr.server.ApplicationBuilder;
import com.qwazr.server.BaseServer;
import com.qwazr.server.GenericServer;
import com.qwazr.server.GenericServerBuilder;
import com.qwazr.server.RestApplication;
import com.qwazr.server.WelcomeShutdownService;
import com.qwazr.server.configuration.ServerConfiguration;
import org.quartz.SchedulerException;

import javax.management.JMException;
import javax.servlet.ServletException;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class SchedulerServer implements BaseServer {

	private final GenericServer server;
	private final SchedulerServiceBuilder serviceBuilder;

	private SchedulerServer(final ServerConfiguration configuration) throws IOException, SchedulerException {
		final ExecutorService executorService = Executors.newCachedThreadPool();
		final GenericServerBuilder builder = GenericServer.of(configuration, executorService);

		final Set services = new HashSet<>();
		services.add(ClusterServiceInterface.SERVICE_NAME);
		services.add(SchedulerServiceInterface.SERVICE_NAME);
		services.add(ScriptServiceInterface.SERVICE_NAME);
		services.add(LibraryServiceInterface.SERVICE_NAME);

		final ApplicationBuilder webServices = ApplicationBuilder.of("/*").classes(RestApplication.JSON_CLASSES).
				singletons(new WelcomeShutdownService());

		final ClusterManager clusterManager =
				new ClusterManager(executorService, configuration).registerProtocolListener(builder, services);
		webServices.singletons(clusterManager.getService());

		final LibraryManager libraryManager =
				new LibraryManager(configuration.dataDirectory, configuration.getEtcFiles());
		builder.shutdownListener(server -> libraryManager.close());
		webServices.singletons(libraryManager.getService());

		final ScriptManager scriptManager =
				new ScriptManager(executorService, clusterManager, libraryManager.getService(),
						configuration.dataDirectory);
		webServices.singletons(scriptManager.getService());
		final ScriptServiceBuilder scriptServiceBuilder =
				new ScriptServiceBuilder(executorService, clusterManager, scriptManager);

		final SchedulerManager schedulerManager = new SchedulerManager(clusterManager, scriptServiceBuilder,
				SchedulerManager.getMaxThreadConfiguration(configuration), configuration.getEtcFiles());
		builder.shutdownListener((server) -> schedulerManager.close());
		webServices.singletons(schedulerManager.getService());
		serviceBuilder = new SchedulerServiceBuilder(executorService, clusterManager, schedulerManager);

		builder.getWebServiceContext().jaxrs(webServices);
		server = builder.build();
	}

	public GenericServer getServer() {
		return server;
	}

	public SchedulerServiceBuilder getServiceBuilder() {
		return serviceBuilder;
	}

	private static volatile SchedulerServer INSTANCE;

	public static synchronized void shutdown() {
		if (INSTANCE == null)
			return;
		INSTANCE.stop();
		INSTANCE = null;
	}

	public static SchedulerServer getInstance() {
		return INSTANCE;
	}

	public static synchronized void main(final String... args)
			throws IOException, ServletException, ReflectiveOperationException, JMException, SchedulerException {
		shutdown();
		INSTANCE = new SchedulerServer(new ServerConfiguration(args));
		INSTANCE.start();
	}

}