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package spark.storage
import java.io.{Externalizable, IOException, ObjectInput, ObjectOutput}
import java.util.concurrent.ConcurrentHashMap
private[spark] class BlockManagerId(var ip: String, var port: Int) extends Externalizable {
def this() = this(null, 0) // For deserialization only
def this(in: ObjectInput) = this(in.readUTF(), in.readInt())
override def writeExternal(out: ObjectOutput) {
out.writeUTF(ip)
out.writeInt(port)
}
override def readExternal(in: ObjectInput) {
ip = in.readUTF()
port = in.readInt()
}
@throws(classOf[IOException])
private def readResolve(): Object = BlockManagerId.getCachedBlockManagerId(this)
override def toString = "BlockManagerId(" + ip + ", " + port + ")"
override def hashCode = ip.hashCode * 41 + port
override def equals(that: Any) = that match {
case id: BlockManagerId => port == id.port && ip == id.ip
case _ => false
}
}
private[spark] object BlockManagerId {
val blockManagerIdCache = new ConcurrentHashMap[BlockManagerId, BlockManagerId]()
def getCachedBlockManagerId(id: BlockManagerId): BlockManagerId = {
if (blockManagerIdCache.containsKey(id)) {
blockManagerIdCache.get(id)
} else {
blockManagerIdCache.put(id, id)
id
}
}
}
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