// Start an RPC to fetch a Value, handling short-cutting dup-fetches
static RPC<TaskGetKey> start(H2ONode target, Key key) {
// Do we have an old TaskGetKey in-progress?
RPC<TaskGetKey> old = TGKS.get(key);
if (old != null) return old;
// Make a new TGK.
RPC<TaskGetKey> rpc = new RPC(target, new TaskGetKey(key), 1.0f);
if ((old = TGKS.putIfMatchUnlocked(key, rpc, null)) != null)
return old; // Failed because an old exists
rpc.setTaskNum().call(); // Start the op
return rpc; // Successful install of a fresh RPC
}
// Make a remotely executed FutureTask. Must name the remote target as well
// as the remote function. This function is expected to be subclassed.
public RPC(H2ONode target, V dtask) {
this(target, dtask, 1.0f);
setTaskNum();
}