cross-build cask.util for Scala.js

2 files changed, 58 insertions, 0 deletions

diff --git a/cask/util/src/cask/util/BatchActor.scala b/cask/util/src/cask/util/BatchActor.scala
new file mode 100644
index 0000000..137b852
--- /dev/null
+++ b/cask/util/src/cask/util/BatchActor.scala
@@ -0,0 +1,40 @@
+package cask.util
+
+import cask.util.Logger
+
+import scala.collection.mutable
+import scala.concurrent.ExecutionContext
+
+/**
+ * A simple asynchrous actor, allowing safe concurrent asynchronous processing
+ * of queued items. `run` handles items in batches, to allow for batch
+ * processing optimizations to be used where relevant.
+ */
+abstract class BatchActor[T]()(implicit ec: ExecutionContext,
+                               log: Logger) {
+  def run(items: Seq[T]): Unit
+
+  private val queue = new mutable.Queue[T]()
+  private var scheduled = false
+  def send(t: => T): Unit = synchronized{
+    queue.enqueue(t)
+    if (!scheduled){
+      scheduled = true
+      ec.execute(() => runWithItems())
+    }
+  }
+
+  def runWithItems(): Unit = {
+    val items = synchronized(queue.dequeueAll(_ => true))
+    try run(items)
+    catch{case e: Throwable => log.exception(e)}
+    synchronized{
+      if (queue.nonEmpty) ec.execute(() => runWithItems())
+      else{
+        assert(scheduled)
+        scheduled = false
+      }
+    }
+
+  }
+}
diff --git a/cask/util/src/cask/util/Logger.scala b/cask/util/src/cask/util/Logger.scala
new file mode 100644
index 0000000..8dc3156
--- /dev/null
+++ b/cask/util/src/cask/util/Logger.scala
@@ -0,0 +1,18 @@
+package cask.util
+
+import sourcecode.{File, Line, Text}
+
+trait Logger {
+  def exception(t: Throwable): Unit
+
+  def debug(t: sourcecode.Text[Any])(implicit f: sourcecode.File, line: sourcecode.Line): Unit
+}
+object Logger{
+  class Console() extends Logger{
+    def exception(t: Throwable): Unit = t.printStackTrace()
+
+    def debug(t: Text[Any])(implicit f: File, line: Line): Unit = {
+      println(f.value.split('/').last + ":" + line + " " + t.source + " " + pprint.apply(t.value))
+    }
+  }
+}
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