org.openqa.selenium.server.BrowserResponseSequencer Maven / Gradle / Ivy

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Selenium automates browsers. That's it! What you do with that power is entirely up to you.

There is a newer version: 3.9.1

// 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.server;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.logging.Level;
import java.util.logging.Logger;

public class BrowserResponseSequencer {
  static Logger log = Logger.getLogger(BrowserResponseSequencer.class.getName());
  int num = 0;
  final Lock lock;
  final Condition numIncreased;
  final String uniqueId;

  public BrowserResponseSequencer(String uniqueId) {
    this.uniqueId = uniqueId;
    this.lock = new ReentrantLock();
    numIncreased = lock.newCondition();
  }

  public void increaseNum() {
    lock.lock();
    try {
      num++;
      numIncreased.signalAll();
    } finally {
      lock.unlock();
    }
  }

  public void waitUntilNumIsAtLeast(int expected) {
    lock.lock();
    try {
      while (true) {
        if (num >= expected) return;
        log.fine("Waiting " + uniqueId + ", expected sequence number " + expected + ", was " + num +
            ".");
        boolean timedOut = false;
        try {
          timedOut = !numIncreased.await(5, TimeUnit.SECONDS);
        } catch (InterruptedException e) {
          log.log(Level.FINE, "interrupted", e);
        }
        if (timedOut) {
          log.warning(uniqueId + " expected sequence number " + expected + ", was " + num +
              ".  Continuing anyway");
          num++;
          numIncreased.signalAll();
        }
      }
    } finally {
      lock.unlock();
    }
  }

  @Override
  public String toString() {
    return uniqueId + ": " + num;
  }
}