/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.web;

import alluxio.Constants;
import alluxio.master.MasterProcess;
import alluxio.master.block.BlockMaster;
import alluxio.master.file.FileSystemMaster;
import alluxio.util.io.PathUtils;

import com.google.common.base.Preconditions;
import org.eclipse.jetty.servlet.ServletHolder;
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.jersey.servlet.ServletContainer;

import java.net.InetSocketAddress;

import javax.annotation.concurrent.NotThreadSafe;
import javax.servlet.ServletException;

/**
 * The Alluxio master web server.
 */
@NotThreadSafe
public final class MasterWebServer extends WebServer {

  public static final String ALLUXIO_MASTER_SERVLET_RESOURCE_KEY = "Alluxio Master";

  /**
   * Creates a new instance of {@link MasterWebServer}.
   *
   * @param serviceName the service name
   * @param address the service address
   * @param masterProcess the Alluxio master process
   */
  public MasterWebServer(String serviceName, InetSocketAddress address,
      final MasterProcess masterProcess) {
    super(serviceName, address);
    Preconditions.checkNotNull(masterProcess, "Alluxio master cannot be null");

    mWebAppContext
        .addServlet(new ServletHolder(new WebInterfaceGeneralServlet(masterProcess)), "/home");
    mWebAppContext.addServlet(new ServletHolder(
        new WebInterfaceWorkersServlet(masterProcess.getMaster(BlockMaster.class))),
        "/workers");
    mWebAppContext.addServlet(new ServletHolder(
            new WebInterfaceConfigurationServlet(masterProcess.getMaster(FileSystemMaster.class))),
        "/configuration");
    mWebAppContext
        .addServlet(new ServletHolder(new WebInterfaceBrowseServlet(masterProcess)), "/browse");
    mWebAppContext
        .addServlet(new ServletHolder(new WebInterfaceMemoryServlet(masterProcess)), "/memory");
    mWebAppContext.addServlet(new ServletHolder(new WebInterfaceDependencyServlet(masterProcess)),
        "/dependency");
    mWebAppContext.addServlet(new ServletHolder(
            new WebInterfaceDownloadServlet(masterProcess.getMaster(FileSystemMaster.class))),
        "/download");
    mWebAppContext
        .addServlet(new ServletHolder(new WebInterfaceDownloadLocalServlet()), "/downloadLocal");
    mWebAppContext
        .addServlet(new ServletHolder(new WebInterfaceBrowseLogsServlet(true)), "/browseLogs");
    mWebAppContext.addServlet(new ServletHolder(new WebInterfaceHeaderServlet()), "/header");
    mWebAppContext
        .addServlet(new ServletHolder(new WebInterfaceMasterMetricsServlet()), "/metricsui");

    // REST configuration
    ResourceConfig config = new ResourceConfig().packages("alluxio.master", "alluxio.master.block",
        "alluxio.master.file", "alluxio.master.lineage");
    // Override the init method to inject a reference to AlluxioMaster into the servlet context.
    // ServletContext may not be modified until after super.init() is called.
    ServletContainer servlet = new ServletContainer(config) {
      private static final long serialVersionUID = 7756010860672831556L;

      @Override
      public void init() throws ServletException {
        super.init();
        getServletContext().setAttribute(ALLUXIO_MASTER_SERVLET_RESOURCE_KEY, masterProcess);
      }
    };

    ServletHolder servletHolder = new ServletHolder("Alluxio Master Web Service", servlet);
    mWebAppContext.addServlet(servletHolder, PathUtils.concatPath(Constants.REST_API_PREFIX, "*"));
  }
}