fix(runtime): bound resources and quarantine stalled extensions

android/app/src/test/kotlin/com/zarz/spotiflac/NativeResourcePoolsTest.kt

@@ -0,0 +1,62 @@
+package com.zarz.spotiflac
+
+import java.util.concurrent.CountDownLatch
+import java.util.concurrent.TimeUnit
+import kotlin.concurrent.thread
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class NativeResourcePoolsTest {
+    @Test
+    fun keyedLockPoolReclaimsAnIdleKey() {
+        val pool = KeyedLockPool<String>()
+
+        assertEquals("done", pool.withLock("track.flac") { "done" })
+        assertEquals(0, pool.activeKeyCount())
+    }
+
+    @Test
+    fun keyedLockPoolKeepsOneMonitorWhileAnotherCallerWaits() {
+        val pool = KeyedLockPool<String>()
+        val firstEntered = CountDownLatch(1)
+        val releaseFirst = CountDownLatch(1)
+        val secondEntered = CountDownLatch(1)
+
+        val first = thread {
+            pool.withLock("same-name.flac") {
+                firstEntered.countDown()
+                releaseFirst.await(2, TimeUnit.SECONDS)
+            }
+        }
+        assertTrue(firstEntered.await(2, TimeUnit.SECONDS))
+
+        val second = thread {
+            pool.withLock("same-name.flac") {
+                secondEntered.countDown()
+            }
+        }
+        assertFalse(secondEntered.await(100, TimeUnit.MILLISECONDS))
+        assertEquals(1, pool.activeKeyCount())
+
+        releaseFirst.countDown()
+        first.join(2_000)
+        second.join(2_000)
+        assertTrue(secondEntered.await(100, TimeUnit.MILLISECONDS))
+        assertEquals(0, pool.activeKeyCount())
+    }
+
+    @Test
+    fun boundedRegistryConsumesIdsAndEvictsOldestEntries() {
+        val registry = BoundedRegistry<Long>(maxEntries = 2)
+        registry.add(1)
+        registry.add(2)
+        registry.add(3)
+
+        assertFalse(registry.consume(1))
+        assertTrue(registry.consume(2))
+        assertTrue(registry.consume(3))
+        assertEquals(0, registry.size())
+    }
+}