1 files changed, 47 insertions, 0 deletions
diff --git a/app/src/main/java/moe/yuuta/workmode/async/Async.kt b/app/src/main/java/moe/yuuta/workmode/async/Async.kt
new file mode 100644
index 0000000..41542cd
--- /dev/null
+++ b/app/src/main/java/moe/yuuta/workmode/async/Async.kt
@@ -0,0 +1,47 @@
+package moe.yuuta.workmode.async
+
+import android.annotation.SuppressLint
+import android.os.AsyncTask
+
+object Async {
+    fun <T> beginTask(runnable: Runnable<T>, callback: Callback<T>): Stoppable {
+        val task = @SuppressLint("StaticFieldLeak")
+        object : AsyncTask<Void, Void, TaskResult<T>>() {
+            override fun onPostExecute(result: TaskResult<T>) {
+                callback.onStop(result.successful, result.result, result.e)
+            }
+
+            override fun doInBackground(vararg params: Void?): TaskResult<T> {
+                try {
+                    return TaskResult(true, runnable.run(), null)
+                } catch (e: Throwable) {
+                    return TaskResult(false, null, e)
+                }
+            }
+
+            override fun onPreExecute() {
+                callback.onStart()
+            }
+        }
+        val stoppable = object : Stoppable {
+            override fun stop() {
+                if (!isStopped()) task.cancel(true)
+            }
+
+            override fun isStopped(): Boolean = task.isCancelled
+        }
+        task.execute()
+        return stoppable
+    }
+}
+
+@FunctionalInterface
+interface Runnable<T> {
+    fun run(): T?
+}
+
+data class TaskResult<T>(
+        val successful: Boolean,
+        val result: T?,
+        val e: Throwable?
+)
+\ No newline at end of file