fix(#7670): Ensure objects unsubscribe from staleness when destroyed (#7736)

* clear any staleness subscriptions before viewing a new object

* add checkbox to options for createDomainObjectWithDefaults, update swg staleness provider to use new time api, add test

* revert

* modified for simplification and to remove the need to update helper methods

* consistent naming convention

* Update e2e/tests/functional/staleness.e2e.spec.js

Co-authored-by: Jesse Mazzella <ozyx@users.noreply.github.com>

* adding back vars that were removed

---------

Co-authored-by: Jesse Mazzella <ozyx@users.noreply.github.com>

e2e/tests/functional/staleness.e2e.spec.js

@@ -0,0 +1,64 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2023, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is 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.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+
+import { createDomainObjectWithDefaults, navigateToObjectWithRealTime } from '../../appActions.js';
+import { expect, test } from '../../pluginFixtures.js';
+
+test.describe('Staleness', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.goto('./', { waitUntil: 'domcontentloaded' });
+  });
+
+  test('Does not show staleness after navigating from a stale object', async ({ page }) => {
+    const objectViewSelector = '.c-object-view';
+    const isStaleClass = 'is-stale';
+    const staleSWG = await createDomainObjectWithDefaults(page, {
+      type: 'Sine Wave Generator',
+      name: 'SWG'
+    });
+
+    // edit properties and enable staleness updates
+    await page.getByLabel('More actions').click();
+    await page.getByLabel('Edit properties...').click();
+    await page.getByLabel('Provide Staleness Updates', { exact: true }).click();
+    await page.getByLabel('Save').click();
+
+    const folder = await createDomainObjectWithDefaults(page, {
+      type: 'Folder',
+      name: 'Folder 1'
+    });
+
+    // Navigate to the stale object
+    await navigateToObjectWithRealTime(page, staleSWG.url);
+
+    // Assert that staleness is shown
+    await expect(page.locator(`${objectViewSelector} .${isStaleClass}`)).toBeAttached({
+      timeout: 30 * 1000 // Give 30 seconds for the staleness to be updated
+    });
+
+    // Immediately navigate to the folder
+    await page.goto(folder.url);
+
+    // Verify that staleness is not shown
+    await expect(page.locator(`${objectViewSelector} .${isStaleClass}`)).not.toBeAttached();
+  });
+});

example/generator/SinewaveStalenessProvider.js

@@ -26,7 +26,6 @@ export default class SinewaveLimitProvider extends EventEmitter {
   #openmct;
   #observingStaleness;
   #watchingTheClock;
-  #isRealTime;
 
   constructor(openmct) {
     super();
@@ -34,7 +33,6 @@ export default class SinewaveLimitProvider extends EventEmitter {
     this.#openmct = openmct;
     this.#observingStaleness = {};
     this.#watchingTheClock = false;
-    this.#isRealTime = undefined;
   }
 
   supportsStaleness(domainObject) {
@@ -61,10 +59,7 @@ export default class SinewaveLimitProvider extends EventEmitter {
   subscribeToStaleness(domainObject, callback) {
     const id = this.#getObjectKeyString(domainObject);
 
-    if (this.#isRealTime === undefined) {
-      this.#updateRealTime(this.#openmct.time.getMode());
-    }
-
+    this.#realTimeCheck();
     this.#handleClockUpdate();
 
     if (this.#observerExists(id)) {
@@ -92,17 +87,15 @@ export default class SinewaveLimitProvider extends EventEmitter {
 
     if (observers && !this.#watchingTheClock) {
       this.#watchingTheClock = true;
-      this.#openmct.time.on('modeChanged', this.#updateRealTime, this);
+      this.#openmct.time.on('modeChanged', this.#realTimeCheck, this);
     } else if (!observers && this.#watchingTheClock) {
       this.#watchingTheClock = false;
-      this.#openmct.time.off('modeChanged', this.#updateRealTime, this);
+      this.#openmct.time.off('modeChanged', this.#realTimeCheck, this);
     }
   }
 
-  #updateRealTime(mode) {
-    this.#isRealTime = mode !== 'fixed';
-
-    if (!this.#isRealTime) {
+  #realTimeCheck() {
+    if (!this.#openmct.time.isRealTime()) {
       Object.keys(this.#observingStaleness).forEach((id) => {
         this.#updateStaleness(id, false);
       });
@@ -140,7 +133,7 @@ export default class SinewaveLimitProvider extends EventEmitter {
   }
 
   #providingStaleness(domainObject) {
-    return domainObject.telemetry?.staleness === true && this.#isRealTime;
+    return domainObject.telemetry?.staleness === true && this.#openmct.time.isRealTime();
   }
 
   #getObjectKeyString(object) {

src/ui/components/ObjectView.vue

@@ -352,6 +352,10 @@ export default {
     show(object, viewKey, immediatelySelect, currentObjectPath) {
       this.updateStyle();
 
+      if (this.domainObject) {
+        this.triggerUnsubscribeFromStaleness(this.domainObject);
+      }
+
       if (this.removeSelectable) {
         this.removeSelectable();
         delete this.removeSelectable;