code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC 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.openqa.selenium.grid.distributor.config;
  
  import static org.openqa.selenium.grid.config.StandardGridRoles.DISTRIBUTOR_ROLE;
  import static org.openqa.selenium.grid.distributor.config.DistributorOptions.DEFAULT_DISTRIBUTOR_IMPLEMENTATION;
  import static org.openqa.selenium.grid.distributor.config.DistributorOptions.DEFAULT_HEALTHCHECK_INTERVAL;
  import static org.openqa.selenium.grid.distributor.config.DistributorOptions.DEFAULT_NEWSESSION_THREADPOOL_SIZE;
  import static org.openqa.selenium.grid.distributor.config.DistributorOptions.DEFAULT_REJECT_UNSUPPORTED_CAPS;
  import static org.openqa.selenium.grid.distributor.config.DistributorOptions.DEFAULT_SLOT_MATCHER;
  import static org.openqa.selenium.grid.distributor.config.DistributorOptions.DEFAULT_SLOT_SELECTOR_IMPLEMENTATION;
  import static org.openqa.selenium.grid.distributor.config.DistributorOptions.DISTRIBUTOR_SECTION;
  
  import com.beust.jcommander.Parameter;
  import com.google.auto.service.AutoService;
  import java.net.URI;
  import java.util.Collections;
  import java.util.Set;
  import org.openqa.selenium.grid.config.ConfigValue;
  import org.openqa.selenium.grid.config.HasRoles;
  import org.openqa.selenium.grid.config.Role;
  
  @SuppressWarnings("FieldMayBeFinal")
  @AutoService(HasRoles.class)
  public class DistributorFlags implements HasRoles {
  
    @Parameter(
        names = {"-d", "--distributor"},
        description = "Url of the distributor.")
    @ConfigValue(section = DISTRIBUTOR_SECTION, name = "host", example = "\"http://localhost:5553\"")
    private URI distributorServer;
  
    @Parameter(
        names = "--distributor-port",
        description = "Port on which the distributor is listening.")
    @ConfigValue(section = DISTRIBUTOR_SECTION, name = "port", example = "5553")
    private Integer distributorServerPort;
  
    @Parameter(
        names = "--distributor-host",
        description = "Host on which the distributor is listening.")
    @ConfigValue(section = DISTRIBUTOR_SECTION, name = "hostname", example = "\"localhost\"")
    private String distributorServerHost;
  
    @Parameter(
        names = {"--distributor-implementation"},
        description = "Full classname of non-default distributor implementation")
    @ConfigValue(
        section = DISTRIBUTOR_SECTION,
        name = "implementation",
        example = DEFAULT_DISTRIBUTOR_IMPLEMENTATION)
    private String implementation = DEFAULT_DISTRIBUTOR_IMPLEMENTATION;
  
    @Parameter(
        names = {"--slot-matcher"},
        description =
            "Full classname of non-default slot matcher to use. This is used to determine whether a"
                + " Node can support a particular session.")
    @ConfigValue(section = DISTRIBUTOR_SECTION, name = "slot-matcher", example = DEFAULT_SLOT_MATCHER)
    private String slotMatcher = DEFAULT_SLOT_MATCHER;
  
    @Parameter(
        names = {"--slot-selector"},
        description =
            "Full classname of non-default slot selector. This is used to select a slot in a Node"
                + " once the Node has been matched.")
    @ConfigValue(
        section = DISTRIBUTOR_SECTION,
        name = "slot-selector",
        example = DEFAULT_SLOT_SELECTOR_IMPLEMENTATION)
    private String slotSelector = DEFAULT_SLOT_SELECTOR_IMPLEMENTATION;
  
    @Parameter(
        names = {"--healthcheck-interval"},
        description =
            "How often, in seconds, will the health check run for all Nodes."
                + "This ensures the server can ping all the Nodes successfully.")
    @ConfigValue(section = DISTRIBUTOR_SECTION, name = "healthcheck-interval", example = "60")
    public int healthcheckInterval = DEFAULT_HEALTHCHECK_INTERVAL;
  
    @Parameter(
        description =
            "Allow the Distributor to reject a request immediately if the Grid does not support the"
                + " requested capability.Rejecting requests immediately is suitable for Grid set up"
                + " that does not spin up Nodes on demand.",
        names = "--reject-unsupported-caps",
        arity = 1)
    @ConfigValue(section = DISTRIBUTOR_SECTION, name = "reject-unsupported-caps", example = "true")
    private boolean rejectUnsupportedCaps = DEFAULT_REJECT_UNSUPPORTED_CAPS;
  
    @Parameter(
        names = {"--newsession-threadpool-size"},
        description =
            "The Distributor uses a fixed-sized thread pool to create new sessions as it consumes new"
                + " session requests from the queue.This allows configuring the size of the thread"
                + " pool. The default value is no. of available processors * 3. Note: If the no. of"
                + " threads is way greater than the available processors it will not always increase"
                + " the performance. A high number of threads causes more context switching which is"
                + " an expensive operation. ")
    @ConfigValue(section = DISTRIBUTOR_SECTION, name = "newsession-threadpool-size", example = "4")
    public int newSessionThreadPoolSize = DEFAULT_NEWSESSION_THREADPOOL_SIZE;
  
    @Override
    public Set<Role> getRoles() {
      return Collections.singleton(DISTRIBUTOR_ROLE);
    }
  }
  