core-plugin-api: useAnalytics clean up

Signed-off-by: Vincenzo Scamporlino <vincenzos@spotify.com>

packages/core-plugin-api/src/analytics/Tracker.ts

@@ -1,59 +0,0 @@
-/*
- * Copyright 2021 The Backstage Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import {
-  AnalyticsApi,
-  AnalyticsEventAttributes,
-  AnalyticsTracker,
-} from '../apis';
-import { AnalyticsContextValue } from './';
-
-export class Tracker implements AnalyticsTracker {
-  constructor(
-    private readonly analyticsApi: AnalyticsApi,
-    private context: AnalyticsContextValue = {
-      routeRef: 'unknown',
-      pluginId: 'root',
-      extension: 'App',
-    },
-  ) {}
-
-  setContext(context: AnalyticsContextValue) {
-    this.context = context;
-  }
-
-  captureEvent(
-    action: string,
-    subject: string,
-    {
-      value,
-      attributes,
-    }: { value?: number; attributes?: AnalyticsEventAttributes } = {},
-  ) {
-    try {
-      this.analyticsApi.captureEvent({
-        action,
-        subject,
-        value,
-        attributes,
-        context: this.context,
-      });
-    } catch (e) {
-      // eslint-disable-next-line no-console
-      console.warn('Error during analytics event capture. %o', e);
-    }
-  }
-}

packages/core-plugin-api/src/analytics/useAnalytics.tsx

@@ -20,9 +20,9 @@ import {
   AnalyticsTracker,
   AnalyticsApi,
   useApi,
+  AnalyticsEventAttributes,
 } from '../apis';
-import { useRef } from 'react';
-import { Tracker } from './Tracker';
+import { useMemo } from 'react';
 
 function useAnalyticsApi(): AnalyticsApi {
   try {
@@ -38,22 +38,32 @@ function useAnalyticsApi(): AnalyticsApi {
  * @public
  */
 export function useAnalytics(): AnalyticsTracker {
-  const trackerRef = useRef<Tracker | null>(null);
   const context = useAnalyticsContext();
-  // Our goal is to make this API truly optional for any/all consuming code
-  // (including tests). This hook runs last to ensure hook order is, as much as
-  // possible, maintained.
   const analyticsApi = useAnalyticsApi();
 
-  function getTracker(): Tracker {
-    if (trackerRef.current === null) {
-      trackerRef.current = new Tracker(analyticsApi);
-    }
-    return trackerRef.current;
-  }
-
-  const tracker = getTracker();
-  tracker.setContext(context);
-
-  return tracker;
+  return useMemo(() => {
+    return {
+      captureEvent(
+        action: string,
+        subject: string,
+        {
+          value,
+          attributes,
+        }: { value?: number; attributes?: AnalyticsEventAttributes } = {},
+      ) {
+        try {
+          analyticsApi.captureEvent({
+            action,
+            subject,
+            value,
+            attributes,
+            context,
+          });
+        } catch (e) {
+          // eslint-disable-next-line no-console
+          console.warn('Error during analytics event capture. %o', e);
+        }
+      },
+    };
+  }, [analyticsApi, context]);
 }