我试图理解twitter gizzard示例rowz,我无法弄清楚scala中这个小片段的作用:
package com.twitter.rowz
import com.twitter.gizzard.nameserver.{Forwarding, NameServer}
import com.twitter.gizzard.shards.ShardException
class ForwardingManager(nameServer: NameServer[Shard]) extends (Long => Shard) {
def apply(id: Long) = nameServer.findCurrentForwarding(0, id)
}
课程到底是什么？