Current doc string:
Blocks the current thread (indefinitely!) until all actions
dispatched thus far, from this thread or agent, to the agent(s) have
occurred. Will block on failed agents. Will never return if
a failed agent is restarted with :clear-actions true.
What it doesn't note is that (as is typical, mind you, of blocking
methods in Java) you can kick the thread out of its funk with
interrupt:
; Make an agent
=> (def a (agent 1))
#'user/a
; Make agent busy and cause it to fail after five seconds
=> (send a #(do (Thread/sleep 5000) (/ % 0)))
#<Agent@53d34c: 1>
; Make a thread that will await the agent
=> (def t (Thread. #(try
(await a)
(catch InterruptedException _
(println "boo!")))))
#'user/t
; Start it
=> (.start t)
nil
; Interrupt it (wait a few seconds before issuing this)
=> (.interrupt t)
boo!
nil
So, await can be interrupted and will then throw InterruptedException,
which can be caught and handled. This provides a possible means of
recovery from the "will never return..." condition described in the
docs.
--
Protege: What is this seething mass of parentheses?!
Master: Your father's Lisp REPL. This is the language of a true
hacker. Not as clumsy or random as C++; a language for a more
civilized age.
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