Adds telemetry criterion class and related tests

src/plugins/condition/criterion/TelemetryCriterion.js

@@ -0,0 +1,83 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2019, 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 * as EventEmitter from 'eventemitter3';
+
+export default class TelemetryCriterion extends EventEmitter {
+
+    constructor(telemetryDomainObject, openmct) {
+        super();
+
+        this.telemetryObject = telemetryDomainObject;
+        this.openmct = openmct;
+        this.telemetryAPI = this.openmct.telemetry;
+        this.subscription = null;
+        this.telemetryObjectIdAsString = null;
+        this.telemetryMetadata = null;
+        if (this.telemetryAPI.isTelemetryObject(this.telemetryObject)) {
+            this.telemetryObjectIdAsString = this.openmct.objects.makeKeyString(this.telemetryObject.identifier);
+        }
+    }
+
+    handleSubscription(datum) {
+        //data is telemetry values, error
+        //how do I get data here?
+        this.emitResult(this.normalizeData(datum));
+    }
+
+    //TODO: Revisit this logic
+    normalizeData(datum) {
+        return {
+            [datum.key]: datum[datum.source]
+        }
+    }
+
+    emitResult(data, error) {
+        this.emit('criterion::Update', {
+            identifier: this.telemetryObjectIdAsString,
+            data: data,
+            error: error
+        });
+    }
+
+    /**
+     *  Subscribes to the telemetry object and returns an unsubscribe function
+     */
+    subscribe() {
+        this.subscription = this.telemetryAPI.subscribe(this.telemetryObject, (datum) => {
+            this.handleSubscription(datum);
+        });
+    }
+
+    /**
+     *  Calls an unsubscribe function returned by subscribe() and deletes any initialized data
+     */
+    unsubscribe() {
+        //unsubscribe from telemetry source
+        this.subscription();
+        delete this.subscription;
+        this.emit('criterion::Remove', this.telemetryObjectIdAsString);
+        delete this.telemetryObjectIdAsString;
+        delete this.telemetryObject;
+        delete this.telemetryMetadata;
+    }
+}

src/plugins/condition/criterion/TelemetryCriterionSpec.js

@@ -0,0 +1,107 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2019, 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 TelemetryCriterion from "./TelemetryCriterion";
+import { createOpenMct } from "../../../testTools";
+
+let openmct,
+    mockListener,
+    testTelemetryObject,
+    telemetryCriterion;
+
+describe("The telemetry criterion", function () {
+
+    beforeEach (() => {
+        openmct = createOpenMct();
+        mockListener = jasmine.createSpy('listener');
+        testTelemetryObject = {
+            identifier:{ namespace: "", key: "test-object"},
+            type: "test-object",
+            name: "Test Object",
+            telemetry: {
+                values: [{
+                    key: "some-key",
+                    name: "Some attribute",
+                    hints: {
+                        domain: 1
+                    }
+                }, {
+                    key: "some-other-key",
+                    name: "Another attribute",
+                    hints: {
+                        range: 1
+                    }
+                }]
+            }
+        };
+
+        telemetryCriterion = new TelemetryCriterion(
+            testTelemetryObject,
+            openmct
+        );
+
+        telemetryCriterion.on('criterion::Update', mockListener);
+
+    });
+
+    it("initializes with a telemetry objectId as string", function () {
+        expect(telemetryCriterion.telemetryObjectIdAsString).toEqual(testTelemetryObject.identifier.key);
+    });
+
+    it("subscribes to telemetry providers", function () {
+        telemetryCriterion.subscribe();
+        expect(telemetryCriterion.subscription).toBeDefined();
+    });
+
+    it("normalizes telemetry data", function () {
+        let result = telemetryCriterion.normalizeData({
+            key: 'some-key',
+            source: 'testSource',
+            testSource: 'Hello'
+        });
+        expect(result).toEqual({
+            'some-key': 'Hello'
+        })
+    });
+
+    it("emits update event on new data from telemetry providers", function () {
+        spyOn(telemetryCriterion, 'emitResult').and.callThrough();
+        telemetryCriterion.handleSubscription({
+            key: 'some-key',
+            source: 'testSource',
+            testSource: 'Hello'
+        });
+        expect(telemetryCriterion.emitResult).toHaveBeenCalled();
+        expect(mockListener).toHaveBeenCalled();
+    });
+
+    it("un-subscribes from telemetry providers", function () {
+        telemetryCriterion.subscribe();
+        expect(telemetryCriterion.subscription).toBeDefined();
+        telemetryCriterion.unsubscribe();
+        expect(telemetryCriterion.subscription).toBeUndefined();
+        expect(telemetryCriterion.telemetryObjectIdAsString).toBeUndefined();
+        expect(telemetryCriterion.telemetryObject).toBeUndefined();
+        expect(telemetryCriterion.telemetryMetadata).toBeUndefined();
+    });
+
+});