content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF 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.apache.bifromq.plugin.settingprovider;
  
  import org.pf4j.ExtensionPoint;
  
  public interface ISettingProvider extends ExtensionPoint {
      /**
       * Provide a value of the setting for given tenant. The method will be called by BifroMQ working thread, so it's
       * expected to be performant and non-blocking otherwise the overall performance will be greatly impacted. It's
       * allowed to return null to reuse the current setting value, in case the value could not be determined in timely
       * manner.
       *
       * @param setting  the setting for the client
       * @param tenantId the id of the calling tenant
       * @return the setting value for the client or null
       */
      <R> R provide(Setting setting, String tenantId);
  
      /**
       * This method will be called during broker shutdown.
       */
      default void close() {
  
      }
  }
  