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.session.remote;
  
  import static java.util.concurrent.TimeUnit.SECONDS;
  
  import java.io.IOException;
  import java.io.UncheckedIOException;
  import java.lang.reflect.Method;
  import java.net.URL;
  import java.util.Map;
  import java.util.Optional;
  import java.util.function.Function;
  import java.util.function.Predicate;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  import javax.management.MalformedObjectNameException;
  import javax.management.ObjectName;
  import org.openqa.selenium.Capabilities;
  import org.openqa.selenium.InvalidArgumentException;
  import org.openqa.selenium.SessionNotCreatedException;
  import org.openqa.selenium.grid.data.CreateSessionRequest;
  import org.openqa.selenium.grid.jmx.JMXHelper;
  import org.openqa.selenium.grid.jmx.ManagedService;
  import org.openqa.selenium.grid.session.ActiveSession;
  import org.openqa.selenium.internal.Require;
  import org.openqa.selenium.net.PortProber;
  import org.openqa.selenium.remote.Dialect;
  import org.openqa.selenium.remote.SessionId;
  import org.openqa.selenium.remote.http.HttpHandler;
  import org.openqa.selenium.remote.http.HttpMethod;
  import org.openqa.selenium.remote.http.HttpRequest;
  import org.openqa.selenium.remote.service.DriverService;
  import org.openqa.selenium.remote.tracing.Tracer;
  
  @ManagedService
  public class ServicedSession extends RemoteSession {
  
    private static final Logger LOG = Logger.getLogger(ServicedSession.class.getName());
  
    private final DriverService service;
  
    public ServicedSession(
        DriverService service,
        Dialect downstream,
        Dialect upstream,
        HttpHandler codec,
        SessionId id,
        Map<String, Object> capabilities) {
      super(downstream, upstream, codec, id, capabilities);
  
      this.service = service;
  
      new JMXHelper().register(this);
    }
  
    @Override
    public String toString() {
      return getId().toString() + " (" + service.getClass().getName() + ")";
    }
  
    @Override
    public void stop() {
      // Try and kill the running session. Both W3C and OSS use the same quit endpoint
      try {
        HttpRequest request = new HttpRequest(HttpMethod.DELETE, "/session/" + getId());
        execute(request);
      } catch (UncheckedIOException e) {
        // This is fine.
      }
  
      service.stop();
    }
  
    public static class Factory extends RemoteSession.Factory<DriverService> {
  
      private final Tracer tracer;
      private final Predicate<Capabilities> key;
      private final Function<Capabilities, ? extends DriverService> createService;
      private final String serviceClassName;
  
      public Factory(Tracer tracer, Predicate<Capabilities> key, String serviceClassName) {
        this.tracer = Require.nonNull("Tracer", tracer);
        this.key = Require.nonNull("Accepted capabilities predicate", key);
  
        this.serviceClassName = Require.nonNull("Driver service class name", serviceClassName);
        try {
          Class<? extends DriverService> driverClazz =
              Class.forName(serviceClassName).asSubclass(DriverService.class);
  
          Function<Capabilities, ? extends DriverService> factory =
              get(driverClazz, Capabilities.class);
          if (factory == null) {
            factory = get(driverClazz);
          }
  
          if (factory == null) {
            throw new IllegalArgumentException(
                "DriverService has no mechanism to create a default instance: " + serviceClassName);
          }
  
          this.createService = factory;
        } catch (ReflectiveOperationException e) {
          throw new IllegalArgumentException(
              "DriverService class does not exist: " + serviceClassName);
        }
      }
  
      private Function<Capabilities, ? extends DriverService> get(
          Class<? extends DriverService> driverServiceClazz, Class... args) {
        try {
          Method serviceMethod = driverServiceClazz.getDeclaredMethod("createDefaultService", args);
          serviceMethod.setAccessible(true);
          return caps -> {
            try {
              if (args.length > 0) {
                return (DriverService) serviceMethod.invoke(null, caps);
              } else {
                return (DriverService) serviceMethod.invoke(null);
              }
            } catch (ReflectiveOperationException e) {
              throw new SessionNotCreatedException(
                  "Unable to create new service: " + driverServiceClazz.getSimpleName(), e);
            }
          };
        } catch (ReflectiveOperationException e) {
          return null;
        }
      }
  
      @Override
      public boolean test(Capabilities capabilities) {
        return key.test(capabilities);
      }
  
      @Override
      public Optional<ActiveSession> apply(CreateSessionRequest sessionRequest) {
        Require.nonNull("Session creation request", sessionRequest);
        DriverService service = createService.apply(sessionRequest.getDesiredCapabilities());
  
        try {
          service.start();
  
          PortProber.waitForPortUp(service.getUrl().getPort(), 30, SECONDS);
  
          URL url = service.getUrl();
  
          return performHandshake(
              tracer,
              service,
              url,
              sessionRequest.getDownstreamDialects(),
              sessionRequest.getDesiredCapabilities());
        } catch (IOException
            | IllegalStateException
            | NullPointerException
            | InvalidArgumentException e) {
          LOG.log(Level.INFO, e.getMessage(), e);
          service.stop();
          return Optional.empty();
        }
      }
  
      @Override
      protected ServicedSession newActiveSession(
          DriverService service,
          Dialect downstream,
          Dialect upstream,
          HttpHandler codec,
          SessionId id,
          Map<String, Object> capabilities) {
        return new ServicedSession(service, downstream, upstream, codec, id, capabilities);
      }
  
      @Override
      public String toString() {
        return getClass().getName() + " (provider: " + serviceClassName + ")";
      }
    }
  
    public ObjectName getObjectName() throws MalformedObjectNameException {
      return new ObjectName(
          String.format(
              "org.seleniumhq.server:type=Session,browser=\"%s\",id=%s",
              getCapabilities().get("browserName"), getId()));
    }
  }
  