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.csp.sentinel.cluster.server.codec;
  
  import com.alibaba.csp.sentinel.cluster.codec.request.RequestEntityDecoder;
  import com.alibaba.csp.sentinel.cluster.codec.response.ResponseEntityWriter;
  import com.alibaba.csp.sentinel.log.RecordLog;
  import com.alibaba.csp.sentinel.spi.SpiLoader;
  
  /**
   * @author Eric Zhao
   * @since 1.4.0
   */
  public final class ServerEntityCodecProvider {
  
      private static RequestEntityDecoder requestEntityDecoder = null;
      private static ResponseEntityWriter responseEntityWriter = null;
  
      static {
          resolveInstance();
      }
  
      private static void resolveInstance() {
          ResponseEntityWriter writer = SpiLoader.of(ResponseEntityWriter.class).loadFirstInstance();
          if (writer == null) {
              RecordLog.warn("[ServerEntityCodecProvider] No existing response entity writer, resolve failed");
          } else {
              responseEntityWriter = writer;
              RecordLog.info("[ServerEntityCodecProvider] Response entity writer resolved: {}",
                  responseEntityWriter.getClass().getCanonicalName());
          }
          RequestEntityDecoder decoder = SpiLoader.of(RequestEntityDecoder.class).loadFirstInstance();
          if (decoder == null) {
              RecordLog.warn("[ServerEntityCodecProvider] No existing request entity decoder, resolve failed");
          } else {
              requestEntityDecoder = decoder;
              RecordLog.info("[ServerEntityCodecProvider] Request entity decoder resolved: {}",
                  requestEntityDecoder.getClass().getCanonicalName());
          }
      }
  
      public static RequestEntityDecoder getRequestEntityDecoder() {
          return requestEntityDecoder;
      }
  
      public static ResponseEntityWriter getResponseEntityWriter() {
          return responseEntityWriter;
      }
  
      private ServerEntityCodecProvider() {}
  }
  