content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed 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 com.alibaba.nacos.consistency;
  
  import com.alibaba.nacos.consistency.entity.ReadRequest;
  import com.alibaba.nacos.consistency.entity.Response;
  import com.alibaba.nacos.consistency.entity.WriteRequest;
  
  /**
   * Can be discovered through SPI or Spring, This interface is just a function definition interface. Different
   * consistency protocols have their pwd
   * LogDispatcher. It is not recommended to directly implement this interface.
   *
   * @author <a href="mailto:liaochuntao@live.com">liaochuntao</a>
   */
  @SuppressWarnings("PMD.AbstractClassShouldStartWithAbstractNamingRule")
  public abstract class RequestProcessor {
      
      /**
       * get data by key.
       *
       * @param request request {@link com.alibaba.nacos.consistency.entity.ReadRequest}
       * @return target type data
       */
      public abstract Response onRequest(ReadRequest request);
      
      /**
       * Process Submitted Log.
       *
       * @param log {@link WriteRequest}
       * @return {@link boolean}
       */
      public abstract Response onApply(WriteRequest log);
      
      /**
       * Irremediable errors that need to trigger business price cuts.
       *
       * @param error {@link Throwable}
       */
      public void onError(Throwable error) {
      }
      
      /**
       * In order for the state machine that handles the transaction to be able to route the Log to the correct
       * LogProcessor, the LogProcessor needs to have an identity information.
       *
       * @return Business unique identification name
       */
      public abstract String group();
      
  }
  