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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;
  }

}