Macro
If an io! block occurs in a transaction, throws an IllegalStateException, else runs body in an implicit do. If the first expression in body is a literal string, will use that as the exception message.
; clojure/core.clj:1405 (defmacro io! [& body] (let [message (when (string? (first body)) (first body)) body (if message (next body) body)] `(if (clojure.lang.LockingTransaction/isRunning) (throw (new IllegalStateException ~(or message "I/O in transaction"))) (do ~@body))))
Copyright (c) Rich Hickey. All rights reserved.
The use and distribution terms for this software are covered by the Eclipse Public License 1.0, which can be found in the file epl-v10.html at the root of this distribution. By using this software in any fashion, you are agreeing to be bound by the terms of this license. You must not remove this notice, or any other, from this software.