content: /*
   *   MIT License
   *
   *   Copyright (c) 2016 Alibaba Group
   *
   *   Permission is hereby granted, free of charge, to any person obtaining a copy
   *   of this software and associated documentation files (the "Software"), to deal
   *   in the Software without restriction, including without limitation the rights
   *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   *   copies of the Software, and to permit persons to whom the Software is
   *   furnished to do so, subject to the following conditions:
   *
   *   The above copyright notice and this permission notice shall be included in all
   *   copies or substantial portions of the Software.
   *
   *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   *   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   *   SOFTWARE.
   */
  
  package com.alibaba.tac.engine.common.redis;
  
  import com.alibaba.tac.engine.common.SequenceCounter;
  import com.alibaba.tac.engine.util.Bytes;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.commons.lang3.StringUtils;
  import org.springframework.dao.DataAccessException;
  import org.springframework.data.redis.connection.RedisConnection;
  import org.springframework.data.redis.core.RedisCallback;
  import org.springframework.data.redis.core.RedisTemplate;
  import org.springframework.data.redis.core.ValueOperations;
  import org.springframework.data.redis.serializer.RedisSerializer;
  import org.springframework.stereotype.Service;
  
  import javax.annotation.PostConstruct;
  import javax.annotation.Resource;
  
  /**
   * @author jinshuan.li 2018/3/1 07:35
   */
  @Slf4j
  public class RedisSequenceCounter implements SequenceCounter {
  
      /**
       * see counterRedisTemplate's ValueSerializer  , the value will be convert to string ,then do incr
       *
       */
      @Resource(name = "counterRedisTemplate")
      private ValueOperations<String, String> valueOperations;
  
      private String counterKey;
  
      public RedisSequenceCounter(String counterKey) {
  
          this.counterKey = counterKey;
  
      }
  
      @Override
      public void set(long value) {
  
          valueOperations.set(counterKey, String.valueOf(value));
      }
  
      @Override
      public Long get() {
  
          String s = valueOperations.get(counterKey);
          if (StringUtils.isEmpty(s)) {
              return null;
          }
          return Long.valueOf(s);
  
      }
  
      @Override
      public long incrementAndGet() {
  
          Long increment = valueOperations.increment(counterKey, 1);
          if (increment != null) {
              return increment;
          }
          return 0L;
  
      }
  
      @Override
      public long increBy(long delta) {
  
          Long increment = valueOperations.increment(counterKey, delta);
          if (increment != null) {
              return increment;
          }
          return 0L;
      }
  }
  