Model to unify the refresh operation in the GitHub tab

Author: smashwilson

lib/models/refresher.js

@@ -0,0 +1,26 @@
+/**
+ * Uniformly trigger a refetch of all GraphQL query containers within a scoped hierarchy.
+ */
+export default class Refresher {
+  constructor() {
+    this.dispose();
+  }
+
+  setRetryCallback(key, retryCallback) {
+    this.retryByKey.set(key, retryCallback);
+  }
+
+  trigger() {
+    for (const [, retryCallback] of this.retryByKey) {
+      retryCallback();
+    }
+  }
+
+  deregister(key) {
+    this.retryByKey.delete(key);
+  }
+
+  dispose() {
+    this.retryByKey = new Map();
+  }
+}

test/models/refresher.test.js

@@ -0,0 +1,67 @@
+import Refresher from '../../lib/models/refresher';
+
+describe('Refresher', function() {
+  let refresher;
+
+  beforeEach(function() {
+    refresher = new Refresher();
+  });
+
+  afterEach(function() {
+    refresher.dispose();
+  });
+
+  it('calls the latest retry method registered per key instance when triggered', function() {
+    const keyOne = Symbol('one');
+    const keyTwo = Symbol('two');
+
+    const one0 = sinon.spy();
+    const one1 = sinon.spy();
+    const two0 = sinon.spy();
+
+    refresher.setRetryCallback(keyOne, one0);
+    refresher.setRetryCallback(keyOne, one1);
+    refresher.setRetryCallback(keyTwo, two0);
+
+    refresher.trigger();
+
+    assert.isFalse(one0.called);
+    assert.isTrue(one1.called);
+    assert.isTrue(two0.called);
+  });
+
+  it('deregisters a retry callback for a key', function() {
+    const keyOne = Symbol('one');
+    const keyTwo = Symbol('two');
+
+    const one = sinon.spy();
+    const two = sinon.spy();
+
+    refresher.setRetryCallback(keyOne, one);
+    refresher.setRetryCallback(keyTwo, two);
+
+    refresher.deregister(keyOne);
+
+    refresher.trigger();
+
+    assert.isFalse(one.called);
+    assert.isTrue(two.called);
+  });
+
+  it('deregisters all retry callbacks on dispose', function() {
+    const keyOne = Symbol('one');
+    const keyTwo = Symbol('two');
+
+    const one = sinon.spy();
+    const two = sinon.spy();
+
+    refresher.setRetryCallback(keyOne, one);
+    refresher.setRetryCallback(keyTwo, two);
+
+    refresher.dispose();
+    refresher.trigger();
+
+    assert.isFalse(one.called);
+    assert.isFalse(two.called);
+  });
+});