flow like the river

BACK_BACK/node_modules/q/queue.js

@@ -0,0 +1,35 @@
+
+var Q = require("./q");
+
+module.exports = Queue;
+function Queue() {
+    var ends = Q.defer();
+    var closed = Q.defer();
+    return {
+        put: function (value) {
+            var next = Q.defer();
+            ends.resolve({
+                head: value,
+                tail: next.promise
+            });
+            ends.resolve = next.resolve;
+        },
+        get: function () {
+            var result = ends.promise.get("head");
+            ends.promise = ends.promise.get("tail");
+            return result.fail(function (error) {
+                closed.resolve(error);
+                throw error;
+            });
+        },
+        closed: closed.promise,
+        close: function (error) {
+            error = error || new Error("Can't get value from closed queue");
+            var end = {head: Q.reject(error)};
+            end.tail = end;
+            ends.resolve(end);
+            return closed.promise;
+        }
+    };
+}
+