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node_modules/generic-pool/lib/Deferred.js

@@ -0,0 +1,49 @@
+"use strict";
+
+/**
+ * This is apparently a bit like a Jquery deferred, hence the name
+ */
+
+class Deferred {
+  constructor(Promise) {
+    this._state = Deferred.PENDING;
+    this._resolve = undefined;
+    this._reject = undefined;
+
+    this._promise = new Promise((resolve, reject) => {
+      this._resolve = resolve;
+      this._reject = reject;
+    });
+  }
+
+  get state() {
+    return this._state;
+  }
+
+  get promise() {
+    return this._promise;
+  }
+
+  reject(reason) {
+    if (this._state !== Deferred.PENDING) {
+      return;
+    }
+    this._state = Deferred.REJECTED;
+    this._reject(reason);
+  }
+
+  resolve(value) {
+    if (this._state !== Deferred.PENDING) {
+      return;
+    }
+    this._state = Deferred.FULFILLED;
+    this._resolve(value);
+  }
+}
+
+// TODO: should these really live here? or be a seperate 'state' enum
+Deferred.PENDING = "PENDING";
+Deferred.FULFILLED = "FULFILLED";
+Deferred.REJECTED = "REJECTED";
+
+module.exports = Deferred;