一、普通同步方式
最简单和基础的调用方式,
@Test
public void test1Normal() {
Jedis jedis = new Jedis("localhost");
String result = jedis.set("n", "n");
jedis.disconnect();
}
每次set
之后都可以返回结果,标记是否成功。
二、事务方式(Transactions)
redis的事务很简单,他主要目的是保障,一个client发起的事务中的命令可以连续的执行,而中间不会插入其他client的命令。
看下面例子:
public void test2Trans() {
Jedis jedis = new Jedis("localhost");
Transaction tx = jedis.multi();
tx.set("t", "t");
List<Object> results = tx.exec();
jedis.disconnect();
}
我们调用jedis.watch(…)
方法来监控key,如果调用后key值发生变化,则整个事务会执行失败。另外,事务中某个操作失败,并不会回滚其他操作。这一点需要注意。还有,我们可以使用discard()
方法来取消事务。注:事务模式里,不能在中间同步查询。
三、管道(Pipelining)
有时,我们需要采用异步方式,一次发送多个指令,不同步等待其返回结果。这样可以取得非常好的执行效率。这就是管道,调用方法如下:
public void test3Pipelined() {
Jedis jedis = new Jedis("localhost");
Pipeline pipeline = jedis.pipelined();
pipeline.set("p", "p");
List<Object> results = pipeline.syncAndReturnAll();
jedis.disconnect();
}
四、管道中调用事务
就Jedis提供的方法而言,是可以做到在管道中使用事务,其代码如下:
public void test4combPipelineTrans() {
jedis = new Jedis("localhost");
Pipeline pipeline = jedis.pipelined();
pipeline.multi();
for (int i = 0; i < 100000; i++) {
pipeline.set("" + i, "" + i);
}
pipeline.exec();
List<Object> results = pipeline.syncAndReturnAll();
jedis.disconnect();
}
五、分布式直连同步调用
public void test5shardNormal() {
List<JedisShardInfo> shards = Arrays.asList(
new JedisShardInfo("localhost",6379),
new JedisShardInfo("localhost",6380));
ShardedJedis sharding = new ShardedJedis(shards);
String result = sharding.set("sn" + i, "n" + i);
sharding.disconnect();
}
这个是分布式直接连接,并且是同步调用,每步执行都返回执行结果。类似地,还有异步管道调用。
六、分布式直连异步调用
public void test6shardpipelined() {
List<JedisShardInfo> shards = Arrays.asList(
new JedisShardInfo("localhost",6379),
new JedisShardInfo("localhost",6380));
ShardedJedis sharding = new ShardedJedis(shards);
ShardedJedisPipeline pipeline = sharding.pipelined();
pipeline.set("sp" + i, "p" + i);
List<Object> results = pipeline.syncAndReturnAll();
sharding.disconnect();
}
七、分布式连接池同步调用
如果,你的分布式调用代码是运行在线程中,那么上面两个直连调用方式就不合适了,因为直连方式是非线程安全的,这个时候,你就必须选择连接池调用。
public void test7shardSimplePool() {
List<JedisShardInfo> shards = Arrays.asList(
new JedisShardInfo("localhost",6379),
new JedisShardInfo("localhost",6380));
ShardedJedisPool pool = new ShardedJedisPool(new JedisPoolConfig(), shards);
ShardedJedis one = pool.getResource();
long start = System.currentTimeMillis();
for (int i = 0; i < 100000; i++) {
String result = one.set("spn" + i, "n" + i);
}
long end = System.currentTimeMillis();
pool.returnResource(one);
System.out.println("Simple@Pool SET: " + ((end - start)/1000.0) + " seconds");
pool.destroy();
}
八、分布式连接池异步调用
public void test8shardPipelinedPool() {
List<JedisShardInfo> shards = Arrays.asList(
new JedisShardInfo("localhost",6379),
new JedisShardInfo("localhost",6380));
ShardedJedisPool pool = new ShardedJedisPool(new JedisPoolConfig(), shards);
ShardedJedis one = pool.getResource();
ShardedJedisPipeline pipeline = one.pipelined();
pipeline.set("sppn" + i, "n" + i);
List<Object> results = pipeline.syncAndReturnAll();
pool.returnResource(one);
pool.destroy();
}