Tuesday, July 29, 2014

Redis java client Jedis

It is very easy to use

I just follow sample code

and output is excellent ~!!

Jedis jedis = new Jedis("localhost");
jedis.set("foo", "bar");
String value = jedis.get("foo");


and if you access to multithread enviroment follow this article

Basic usage example

using Jedis in a multithreaded environment

You shouldn't use the same instance from different threads because you'll have strange errors. And sometimes creating lots of Jedis instances is not good enough because it means lots of sockets and connections, which leads to strange errors as well. A single Jedis instance is not threadsafe! To avoid these problems, you should use JedisPool, which is a threadsafe pool of network connections. You can use the pool to reliably create several Jedis instances, given you return the Jedis instance to the pool when done. This way you can overcome those strange errors and achieve great performance.
To use it, init a pool:
JedisPool pool = new JedisPool(new JedisPoolConfig(), "localhost");
You can store the pool somewhere statically, it is thread-safe.
JedisPoolConfig includes a number of helpful Redis-specific connection pooling defaults. For example, Jedis with JedisPoolConfig will close a connection after 300 seconds if it has not been returned.
You use it by:

Jedis jedis = pool.getResource();
try {
  /// ... do stuff here ... for example
  jedis.set("foo", "bar");
  String foobar = jedis.get("foo");
  jedis.zadd("sose", 0, "car"); jedis.zadd("sose", 0, "bike"); 
  Set<String> sose = jedis.zrange("sose", 0, -1);
} finally {
  /// ... it's time to release alive/broken Jedis instance...
  if (null != jedis) {
/// ... when closing your application:


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