ShardedJedisPool详解

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ShardedJedisPool类有四个构造函数

  public ShardedJedisPool(final GenericObjectPoolConfig poolConfig, List<JedisShardInfo> shards) {    this(poolConfig, shards, Hashing.MURMUR_HASH);  }  public ShardedJedisPool(final GenericObjectPoolConfig poolConfig, List<JedisShardInfo> shards,      Hashing algo) {    this(poolConfig, shards, algo, null);  }  public ShardedJedisPool(final GenericObjectPoolConfig poolConfig, List<JedisShardInfo> shards,      Pattern keyTagPattern) {    this(poolConfig, shards, Hashing.MURMUR_HASH, keyTagPattern);  }  public ShardedJedisPool(final GenericObjectPoolConfig poolConfig, List<JedisShardInfo> shards,      Hashing algo, Pattern keyTagPattern) {    super(poolConfig, new ShardedJedisFactory(shards, algo, keyTagPattern));  }

其实,最后都是调用父类的构造函数

super(poolConfig, new ShardedJedisFactory(shards, algo, keyTagPattern));

输入参数说明：

final GenericObjectPoolConfig poolConfig：pool的一些设置（maxTotal、maxIdle、minIdle）List<JedisShardInfo> shards：为Redis实例的IP、端口以及超时时间等信息Hashing algo：根据Key计算hash值，从而决定具体存入那个Redis实例Pattern keyTagPattern：Key标签模式，默认是取{}中内容去计算对应Hash值，当key='{key1_0}_0_0'时，**此时将根据’key1_0'来计算对应hash值，而不是根据{key1_0}_0_0来计算hash值**，从而决定将存入到哪个Redis实例中，如果需要将数据进行排序，将要利用这个构造函数，因为只有将需要排序的数据存入同一个Redis实例中，排序才是准确的。

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