Object lifecycle disposes SystemSound

// FREEBIE

SignalMessaging/environment/OWSSounds.m

@@ -14,10 +14,51 @@
 NSString *const kOWSSoundsStorageNotificationCollection = @"kOWSSoundsStorageNotificationCollection";
 NSString *const kOWSSoundsStorageGlobalNotificationKey = @"kOWSSoundsStorageGlobalNotificationKey";
 
+@interface OWSSystemSound : NSObject
+
+@property (nonatomic, readonly) SystemSoundID soundID;
+@property (nonatomic, readonly) NSURL *soundURL;
+
+- (instancetype)init NS_UNAVAILABLE;
+- (instancetype)initWithURL:(NSURL *)url NS_DESIGNATED_INITIALIZER;
+
+@end
+
+@implementation OWSSystemSound
+
+- (instancetype)initWithURL:(NSURL *)url
+{
+    self = [super init];
+
+    if (!self) {
+        return self;
+    }
+
+    DDLogDebug(@"%@ creating system sound for %@", self.logTag, url.lastPathComponent);
+    _soundURL = url;
+
+    SystemSoundID newSoundID;
+    OSStatus status = AudioServicesCreateSystemSoundID((__bridge CFURLRef _Nonnull)(url), &newSoundID);
+    OWSAssert(status == kAudioServicesNoError);
+    OWSAssert(newSoundID);
+    _soundID = newSoundID;
+
+    return self;
+}
+
+- (void)dealloc
+{
+    DDLogDebug(@"%@ in dealloc disposing sound: %@", self.logTag, _soundURL.lastPathComponent);
+    OSStatus status = AudioServicesDisposeSystemSoundID(_soundID);
+    OWSAssert(status == kAudioServicesNoError);
+}
+
+@end
+
 @interface OWSSounds ()
 
 @property (nonatomic, readonly) YapDatabaseConnection *dbConnection;
-@property (nonatomic, readonly) AnyLRUCache *cachedSoundIDs;
+@property (nonatomic, readonly) AnyLRUCache *cachedSystemSounds;
 
 @end
 
@@ -55,7 +96,7 @@ NSString *const kOWSSoundsStorageGlobalNotificationKey = @"kOWSSoundsStorageGlob
     _dbConnection = primaryStorage.newDatabaseConnection;
 
     // Don't store too many sounds in memory. Most users will only use 1 or 2 sounds anyway.
-    _cachedSoundIDs = [[AnyLRUCache alloc] initWithMaxSize:3];
+    _cachedSystemSounds = [[AnyLRUCache alloc] initWithMaxSize:3];
 
     OWSSingletonAssert();
 
@@ -220,24 +261,18 @@ NSString *const kOWSSoundsStorageGlobalNotificationKey = @"kOWSSoundsStorageGlob
 - (SystemSoundID)systemSoundIDForSound:(OWSSound)sound quiet:(BOOL)quiet
 {
     NSString *cacheKey = [NSString stringWithFormat:@"%lu:%d", (unsigned long)sound, quiet];
-    NSNumber *_Nullable cachedSoundId = (NSNumber * _Nullable)[self.cachedSoundIDs getWithKey:cacheKey];
+    OWSSystemSound *_Nullable cachedSound = (OWSSystemSound *)[self.cachedSystemSounds getWithKey:cacheKey];
 
-    if (cachedSoundId) {
-        OWSAssert([cachedSoundId isKindOfClass:[NSNumber class]]);
-        return (SystemSoundID)cachedSoundId.intValue;
+    if (cachedSound) {
+        OWSAssert([cachedSound isKindOfClass:[OWSSystemSound class]]);
+        return cachedSound.soundID;
     }
 
     NSURL *soundURL = [self.class soundURLForSound:sound quiet:quiet];
+    OWSSystemSound *newSound = [[OWSSystemSound alloc] initWithURL:soundURL];
+    [self.cachedSystemSounds setWithKey:cacheKey value:newSound];
 
-    DDLogVerbose(@"%@ creating system sound for %@", self.logTag, soundURL.lastPathComponent);
-    SystemSoundID newSoundID;
-    OSStatus status = AudioServicesCreateSystemSoundID((__bridge CFURLRef _Nonnull)(soundURL), &newSoundID);
-    OWSAssert(status == 0);
-    OWSAssert(newSoundID);
-
-    [self.cachedSoundIDs setWithKey:cacheKey value:@(newSoundID)];
-
-    return newSoundID;
+    return newSound.soundID;
 }
 
 #pragma mark - Notifications