Supports polling for updates

kordophone/Bridge/MBIMUpdateQueue.m

@@ -0,0 +1,61 @@
+//
+//  MBIMUpdateQueue.m
+//  kordophoned
+//
+//  Created by James Magahern on 11/16/18.
+//  Copyright © 2018 James Magahern. All rights reserved.
+//
+
+#import "MBIMUpdateQueue.h"
+
+@implementation MBIMUpdateQueue {
+    dispatch_queue_t     _accessQueue;
+    NSMutableArray      *_consumers;
+}
+
++ (instancetype)sharedInstance
+{
+    static MBIMUpdateQueue *sharedInstance = nil;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        sharedInstance = [[self alloc] init];
+    });
+    
+    return sharedInstance;
+}
+
+- (instancetype)init
+{
+    self = [super init];
+    if (self) {
+        _accessQueue = dispatch_queue_create("net.buzzert.MBIMUpdateQueue", DISPATCH_QUEUE_SERIAL);
+        _consumers = [[NSMutableArray alloc] init];
+    }
+    
+    return self;
+}
+
+- (void)addConsumer:(MBIMUpdateConsumer)consumer
+{
+    __weak NSMutableArray *consumers = _consumers;
+    dispatch_async(_accessQueue, ^{
+        [consumers addObject:consumer];
+    });
+}
+
+- (void)enqueueUpdateItem:(MBIMUpdateItem *)item
+{
+    __weak NSMutableArray *consumers = _consumers;
+    dispatch_async(_accessQueue, ^{
+        for (MBIMUpdateConsumer consumer in consumers) {
+            consumer(item);
+        }
+        
+        [consumers removeAllObjects];
+    });
+}
+
+@end
+
+@implementation MBIMUpdateItem
+@end