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.core.distributed.raft.processor;
  
  import com.alibaba.nacos.consistency.Serializer;
  import com.alibaba.nacos.consistency.entity.Response;
  import com.alibaba.nacos.core.distributed.raft.JRaftServer;
  import com.alibaba.nacos.core.distributed.raft.utils.FailoverClosure;
  import com.alibaba.nacos.core.utils.Loggers;
  import com.alipay.sofa.jraft.Status;
  import com.alipay.sofa.jraft.rpc.RpcContext;
  import com.google.protobuf.Message;
  
  import java.util.Objects;
  
  /**
   * abstract rpc processor.
   *
   * @author <a href="mailto:liaochuntao@live.com">liaochuntao</a>
   */
  public abstract class AbstractProcessor {
      
      private final Serializer serializer;
      
      public AbstractProcessor(Serializer serializer) {
          this.serializer = serializer;
      }
      
      protected void handleRequest(final JRaftServer server, final String group, final RpcContext rpcCtx, Message message) {
          try {
              final JRaftServer.RaftGroupTuple tuple = server.findTupleByGroup(group);
              if (Objects.isNull(tuple)) {
                  rpcCtx.sendResponse(Response.newBuilder().setSuccess(false)
                          .setErrMsg("Could not find the corresponding Raft Group : " + group).build());
                  return;
              }
              if (tuple.getNode().isLeader()) {
                  execute(server, rpcCtx, message, tuple);
              } else {
                  rpcCtx.sendResponse(
                          Response.newBuilder().setSuccess(false).setErrMsg("Could not find leader : " + group).build());
              }
          } catch (Throwable e) {
              Loggers.RAFT.error("handleRequest has error : ", e);
              rpcCtx.sendResponse(Response.newBuilder().setSuccess(false).setErrMsg(e.toString()).build());
          }
      }
      
      protected void execute(JRaftServer server, final RpcContext asyncCtx, final Message message,
              final JRaftServer.RaftGroupTuple tuple) {
          FailoverClosure closure = new FailoverClosure() {
              
              Response data;
              
              Throwable ex;
              
              @Override
              public void setResponse(Response data) {
                  this.data = data;
              }
              
              @Override
              public void setThrowable(Throwable throwable) {
                  this.ex = throwable;
              }
              
              @Override
              public void run(Status status) {
                  if (Objects.nonNull(ex)) {
                      Loggers.RAFT.error("execute has error : ", ex);
                      asyncCtx.sendResponse(Response.newBuilder().setErrMsg(ex.toString()).setSuccess(false).build());
                  } else {
                      asyncCtx.sendResponse(data);
                  }
              }
          };
          
          server.applyOperation(tuple.getNode(), message, closure);
      }
      
  }
  