package

lib/src/Core/AsyncBag.dart

@@ -0,0 +1,58 @@
+import 'AsyncReply.dart';
+
+class AsyncBag<T> extends AsyncReply<List<T>>
+{
+
+    List<AsyncReply<T>> _replies = new List<AsyncReply<T>>();
+    List<T> _results = new List<T>();
+
+    int _count = 0;
+    bool _sealedBag = false;
+
+    seal()
+    {
+        if (_sealedBag)
+            return;
+
+        _sealedBag = true;
+
+        if (_results.length == 0)
+            trigger(new List<T>());
+
+        for (var i = 0; i < _results.length; i++)
+        {
+            var k = _replies[i];
+            var index = i;
+
+            k.then((r)
+            {
+                _results[index] = r;
+                _count++;
+                if (_count == _results.length)
+                    trigger(_results);
+            });
+        }
+    }
+
+    add(AsyncReply<T> reply)
+    {
+        if (!_sealedBag)
+        {
+            _results.add(null);
+            _replies.add(reply);
+        }
+    }
+
+    addBag(AsyncBag<T> bag)
+    {
+        bag._replies.forEach((r) {
+          add(r);
+        });
+    }
+
+    AsyncBag()
+    {
+
+    }
+
+}