Add alert playback controller

2026-08-16 17:19:52 +00:00
parent 594931e51d
commit de09b283ad
2 changed files with 129 additions and 0 deletions
@@ -0,0 +1,49 @@
+package se.ajpanton.notificationsmaster.alerts
+
+/** Plays one resolved effect and invokes [onFinished] when all of its effects finish. */
+fun interface AlertEffectPlayer {
+    fun play(alert: QueuedAlert, onFinished: () -> Unit)
+
+    fun stop() {}
+}
+
+/** Serializes effect playback around the pure queue policy. */
+class AlertPlaybackController(
+    private val effectPlayer: AlertEffectPlayer,
+    private val settings: () -> AlertQueueSettings,
+) {
+    private var queue = AlertQueue()
+
+    @Synchronized
+    fun enqueue(alert: QueuedAlert): AlertQueueTransition {
+        val before = queue
+        return AlertQueueController.enqueue(queue, alert, settings()).also { transition ->
+            queue = transition.queue
+            playCurrentIfChanged(before.current)
+        }
+    }
+
+    @Synchronized
+    fun currentQueue() = queue
+
+    @Synchronized
+    fun stop() {
+        queue = AlertQueue()
+        effectPlayer.stop()
+    }
+
+    @Synchronized
+    private fun complete(alert: QueuedAlert) {
+        if (queue.current != alert) return
+        val before = queue
+        queue = AlertQueueController.completeCurrent(queue).queue
+        playCurrentIfChanged(before.current)
+    }
+
+    private fun playCurrentIfChanged(previous: QueuedAlert?) {
+        val current = queue.current
+        if (previous == current) return
+        effectPlayer.stop()
+        current?.let { alert -> effectPlayer.play(alert) { complete(alert) } }
+    }
+}