org.openqa.selenium.grid.sessionmap.local.LocalSessionMap Maven / Gradle / Ivy

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//   http://www.apache.org/licenses/LICENSE-2.0
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package org.openqa.selenium.grid.sessionmap.local;

import io.opentelemetry.trace.Tracer;
import org.openqa.selenium.NoSuchSessionException;
import org.openqa.selenium.events.EventBus;
import org.openqa.selenium.grid.config.Config;
import org.openqa.selenium.grid.data.Session;
import org.openqa.selenium.grid.log.LoggingOptions;
import org.openqa.selenium.grid.server.EventBusOptions;
import org.openqa.selenium.grid.sessionmap.SessionMap;
import org.openqa.selenium.remote.SessionId;

import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import static org.openqa.selenium.grid.data.SessionClosedEvent.SESSION_CLOSED;

public class LocalSessionMap extends SessionMap {

  private final EventBus bus;
  private final Map knownSessions = new HashMap<>();
  private final ReadWriteLock lock = new ReentrantReadWriteLock(/* be fair */ true);

  public LocalSessionMap(Tracer tracer, EventBus bus) {
    super(tracer);

    this.bus = Objects.requireNonNull(bus);

    bus.addListener(SESSION_CLOSED, event -> {
      SessionId id = event.getData(SessionId.class);
      knownSessions.remove(id);
    });
  }

  public static SessionMap create(Config config) {
    Tracer tracer = new LoggingOptions(config).getTracer();
    EventBus bus = new EventBusOptions(config).getEventBus();

    return new LocalSessionMap(tracer, bus);
  }

  @Override
  public boolean add(Session session) {
    Objects.requireNonNull(session, "Session has not been set");

    Lock writeLock = lock.writeLock();
    writeLock.lock();
    try {
      knownSessions.put(session.getId(), session);
    } finally {
      writeLock.unlock();
    }

    return true;
  }

  @Override
  public Session get(SessionId id) {
    Objects.requireNonNull(id, "Session ID has not been set");

    Lock readLock = lock.readLock();
    readLock.lock();
    try {
      Session session = knownSessions.get(id);
      if (session == null) {
        throw new NoSuchSessionException("Unable to find session with ID: " + id);
      }

      return session;
    } finally {
      readLock.unlock();
    }
  }

  @Override
  public void remove(SessionId id) {
    Objects.requireNonNull(id, "Session ID has not been set");

    Lock writeLock = lock.writeLock();
    writeLock.lock();
    try {
      knownSessions.remove(id);
    } finally {
      writeLock.unlock();
    }
  }
}