package com.atlassian.plugin.manager;
   
   import com.atlassian.annotations.PublicSpi;
   import com.atlassian.plugin.ModuleDescriptor;
   
   import java.util.Set;
   
   import static java.util.Collections.emptySet;
   
  /**
   * Allows to extract the plugin keys defined by 'applications' built on top of a 'product'
   * This component should be overridden by the host product (if it supports the concept of 'applications')
   * For example: For the 'JIRA' product, we have applications such as 'JIRA Service Desk', 'JIRA Software', etc.
   * {@code com.atlassian.application.api.ApplicationManager})
   */
  @PublicSpi
  public interface ApplicationDefinedPluginsProvider {
      /**
       * Default implementation of application defined plugins provider
       * Allows to omit all the checks for application defined descriptors
       */
      ApplicationDefinedPluginsProvider NO_APPLICATION_PLUGINS  = descriptors -> emptySet();
      /**
       * This method extracts the set of plugin keys from the list of module descriptors
       *
       * @param descriptors list of module descriptors available in the system
       * @return set of the plugin keys that are related to the applications
       */
      Set<String> getPluginKeys(Iterable<ModuleDescriptor> descriptors);
  }