co.cask.cdap.gateway.router.RouterMain.java Source code

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Here is the source code for co.cask.cdap.gateway.router.RouterMain.java

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/*
 * Copyright  2014-2015 Cask Data, Inc.
 *
 * 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 co.cask.cdap.gateway.router;

import co.cask.cdap.common.conf.CConfiguration;
import co.cask.cdap.common.conf.Constants;
import co.cask.cdap.common.guice.ConfigModule;
import co.cask.cdap.common.guice.DiscoveryRuntimeModule;
import co.cask.cdap.common.guice.IOModule;
import co.cask.cdap.common.guice.LocationRuntimeModule;
import co.cask.cdap.common.guice.ZKClientModule;
import co.cask.cdap.common.kerberos.SecurityUtil;
import co.cask.cdap.common.runtime.DaemonMain;
import co.cask.cdap.security.guice.SecurityModules;
import com.google.common.base.Throwables;
import com.google.common.util.concurrent.Futures;
import com.google.inject.Guice;
import com.google.inject.Injector;
import org.apache.twill.internal.Services;
import org.apache.twill.zookeeper.ZKClientService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Main class to run Router from command line.
 */
public class RouterMain extends DaemonMain {
    private static final Logger LOG = LoggerFactory.getLogger(RouterMain.class);

    private ZKClientService zkClientService;
    private NettyRouter router;

    public static void main(String[] args) {
        try {
            new RouterMain().doMain(args);
        } catch (Throwable e) {
            LOG.error("Got exception", e);
        }
    }

    @Override
    public void init(String[] args) {
        LOG.info("Initializing Router...");
        try {
            // Load configuration
            CConfiguration cConf = CConfiguration.create();

            if (cConf.getBoolean(Constants.Security.ENABLED)) {
                // Enable Kerberos login
                SecurityUtil.enableKerberosLogin(cConf);
            }

            // Initialize ZK client
            String zookeeper = cConf.get(Constants.Zookeeper.QUORUM);
            if (zookeeper == null) {
                LOG.error("No zookeeper quorum provided.");
                System.exit(1);
            }

            Injector injector = createGuiceInjector(cConf);
            zkClientService = injector.getInstance(ZKClientService.class);

            // Get the Router
            router = injector.getInstance(NettyRouter.class);

            LOG.info("Router initialized.");
        } catch (Throwable t) {
            LOG.error(t.getMessage(), t);
            throw Throwables.propagate(t);
        }
    }

    @Override
    public void start() {
        LOG.info("Starting Router...");
        Futures.getUnchecked(Services.chainStart(zkClientService, router));
        LOG.info("Router started.");
    }

    @Override
    public void stop() {
        LOG.info("Stopping Router...");
        Futures.getUnchecked(Services.chainStop(router, zkClientService));
        LOG.info("Router stopped.");
    }

    @Override
    public void destroy() {
        // Nothing to do
    }

    static Injector createGuiceInjector(CConfiguration cConf) {
        return Guice.createInjector(new ConfigModule(cConf), new ZKClientModule(),
                new LocationRuntimeModule().getDistributedModules(),
                new DiscoveryRuntimeModule().getDistributedModules(), new RouterModules().getDistributedModules(),
                new SecurityModules().getDistributedModules(), new IOModule());
    }
}