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 com.alibaba.cloudapp.seata.demo.service.impl;
  
  import com.alibaba.cloudapp.seata.demo.DemoAsyncCallback;
  import com.alibaba.cloudapp.seata.demo.entity.Stock;
  import com.alibaba.cloudapp.seata.demo.service.BusinessService;
  import com.alibaba.cloudapp.seata.demo.service.StockService;
  import io.seata.core.context.RootContext;
  import io.seata.saga.engine.StateMachineEngine;
  import io.seata.saga.statelang.domain.StateMachineInstance;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Service;
  
  import javax.annotation.Resource;
  import java.math.BigDecimal;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Random;
  
  @Service
  public class BusinessServiceImpl implements BusinessService {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(BusinessService.class);
      
      private static final String MACHINE_NAME = "SagaDemoMachine";
      private static final String TENANT_ID = "";
  
      @Resource
      private StockService stockService;
      @Autowired
      private StateMachineEngine stateMachineEngine;
  
      private final Random random = new Random();
  
      @Override
      public String buy(String userId, String productCode, int count) {
          String businessKey = String.valueOf(System.currentTimeMillis());
          
          Stock stock = stockService.findByProductCode(productCode);
          
          if(stock == null) {
              throw new RuntimeException("product: " + productCode + " not exist");
          }
          
          Map<String, Object> params = new HashMap<>();
          params.put("userId", userId);
          params.put("productCode", productCode);
          params.put("count", count);
          params.put("amount",  stock.getPrice().multiply(new BigDecimal(count)));
          params.put("businessKey", businessKey);
          
          DemoAsyncCallback callback = new DemoAsyncCallback();
          
          StateMachineInstance instance = stateMachineEngine.startWithBusinessKeyAsync(
                  MACHINE_NAME, TENANT_ID, businessKey, params, callback);
          
          LOGGER.info("purchase begin ... xid: " + RootContext.getXID());
          
          callback.waitingForFinish(instance);
          
          LOGGER.info("instance status: {} ", instance.getStatus());
          
          return businessKey;
      }
  
  }
  