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tspool

Simple Apache thrift connection pool for scala

  • it takes a list of Server to load balance request between servers (random)
  • if for any reason one or more servers cannot response, these server will be remove from active servers list, but active server is still be using to perform operation
  • a scheduler will periodically check dead server list to see if they are alive again, then add it to active server list
  • if all servers are dead, PoolConnectionException will be raised

implementation

  • Connection pool built on Apache common pool 2
  • Connection, server checking... uses akka actor
  • addtional: memcached pool example uses spymemcached client

Actually you can use it for any Client service with just a little modification, see example memcached pool implemetation inside this project

Usage

With any thrift Client type you generated using thrift definition file, you can use with this pool, we dont have to write/or generate pool for each Client type.

thift

val poolConfig = new GenericObjectPoolConfig
poolConfig.setMaxTotal(10)
poolConfig.setMinIdle(5)
val server = Server("127.0.0.1", 9999)
val server1 = Server("127.0.0.1", 9998)
val pool = ThriftPool[Client](poolConfig, Servers(List(server, server1)))
try {
  val res: Int = pool.withClient(c => {
    c.plusMe(1, 2)
  })
  println(res)
} catch {
  case x: PoolConnectionException => println(x.getMessage)
}

memcached

val poolConfig = new GenericObjectPoolConfig
poolConfig.setMaxTotal(10)
poolConfig.setMinIdle(5)
val mcPool = MemcachedPool[MemcachedClient](poolConfig, "192.168.10.224", 11212)
val res1: AnyRef = mcPool.withClient(c => {
   c.set("Hello", 86400, "World")
   c.get("Hello")
})
println(res1.toString)