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Print a stacktrace when a listener throws an Exception or Error #14

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Print a stacktrace when a listener throws an Exception or Error #14

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13 changes: 11 additions & 2 deletions src/nextjournal/beholder.clj
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Original file line number Diff line number Diff line change
@@ -1,13 +1,18 @@
(ns nextjournal.beholder
(:require [clojure.stacktrace :as st :refer [print-stack-trace]])
(:import [io.methvin.watcher DirectoryChangeEvent DirectoryChangeEvent$EventType
DirectoryChangeListener DirectoryWatcher]
[java.util.concurrent CompletableFuture]
[java.nio.file Paths]))

(set! *warn-on-reflection* true)

(defn- fn->listener ^DirectoryChangeListener [f]
(reify
DirectoryChangeListener
(onException [this e]
(print-stack-trace e)
(flush))
(onEvent [this e]
(let [path (.path ^DirectoryChangeEvent e)]
(condp = (. ^DirectoryChangeEvent e eventType)
Expand Down Expand Up @@ -36,8 +41,12 @@

Returns a directory watcher that can be passed to `stop` to stop the watch."
[cb & paths]
(doto (create cb paths)
(.watchAsync)))
(-> (create cb paths)
.watchAsync
(CompletableFuture/.exceptionally
(fn [^java.lang.Throwable e]
(print-stack-trace (st/root-cause e))
(flush)))))

(defn watch-blocking
"Blocking version of `watch`."
Expand Down