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

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// 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 org.openqa.selenium.server.browserlaunchers.BrowserInstallationCache;

/**
 * Application Registry. Global object to find common objects and services.
 * 
 * See http://martinfowler.com/eaaCatalog/registry.html
 */
public class ApplicationRegistry {

  private static ApplicationRegistry instance;
  private final BrowserInstallationCache browserInstallationCache;

  public ApplicationRegistry() {
    browserInstallationCache = new BrowserInstallationCache();
  }

  /**
   * Return the singleton instance.
   *
   * @return The singleton instance. Never null.
   */
  public static ApplicationRegistry instance() {
    /*
     * In theory the is no guard against concurrent code and multiple instances could be created. In
     * practice this is not a problem, this scenario is unlikely and all registries would be
     * equivalent.
     */
    if (null == instance) {
      instance = new ApplicationRegistry();
    }
    return instance;
  }

  public BrowserInstallationCache browserInstallationCache() {
    return browserInstallationCache;
  }

}