From 5c5e44df615ce90a9963e9cb10b67e548104ca2d Mon Sep 17 00:00:00 2001
From: Michael Lange <dingoeatingfuzz@gmail.com>
Date: Wed, 29 Aug 2018 17:15:55 -0700
Subject: [PATCH] An abstract class for capturing nomad stats

It follows the form of poll -> json parse -> append,
Where append is defined in subclasses to add data from the new frame
to long-lived rolling arrays of data.
---
 .../utils/classes/abstract-stats-tracker.js   | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 ui/app/utils/classes/abstract-stats-tracker.js

diff --git a/ui/app/utils/classes/abstract-stats-tracker.js b/ui/app/utils/classes/abstract-stats-tracker.js
new file mode 100644
index 000000000..25aa24ca4
--- /dev/null
+++ b/ui/app/utils/classes/abstract-stats-tracker.js
@@ -0,0 +1,27 @@
+import Mixin from '@ember/object/mixin';
+import { assert } from '@ember/debug';
+
+export default Mixin.create({
+  url: '',
+
+  fetch() {
+    assert('StatTrackers need a fetch method, which should have an interface like window.fetch');
+  },
+
+  append(/* frame */) {
+    assert(
+      'StatTrackers need an append method, which takes the JSON response from a request to url as an argument'
+    );
+  },
+
+  poll() {
+    const url = this.get('url');
+    assert('Url must be defined', url);
+
+    return this.get('fetch')(url)
+      .then(res => {
+        return res.json();
+      })
+      .then(frame => this.append(frame));
+  },
+});