Frequency analyzer for MSP frames

js/eventFrequencyAnalyzer.js

@@ -0,0 +1,77 @@
+'use s';
+
+var helper = helper || {};
+
+/**
+ * Simple analyzer that returns frequency of events using 5s buffer
+ * Usage: register periodic events with 'put', then call 'get' to get results
+ */
+helper.eventFrequencyAnalyzer = (function () {
+
+    var privateScope = {},
+        publicScope = {},
+        bufferPeriod = 5000;
+
+    privateScope.data = {};
+    privateScope.output = {};
+    privateScope.intervalHandler;
+
+    /**
+     * Periodically executed aggregation task
+     * @returns {{}|*}
+     */
+    publicScope.analyze = function () {
+        privateScope.output = {};
+
+        for (var i in privateScope.data) {
+            if (privateScope.data.hasOwnProperty(i)) {
+                privateScope.output[i] = privateScope.data[i] / bufferPeriod * 1000;
+            }
+        }
+
+        privateScope.data = {};
+        return privateScope.output;
+    };
+
+    /**
+     * Return event list with frequencies
+     * @returns {{}|*}
+     */
+    publicScope.get = function () {
+        return privateScope.output;
+    };
+
+    /**
+     * Returns raw data
+     * @returns {{}|*}
+     */
+    publicScope.getRaw = function () {
+        return privateScope.data;
+    };
+
+    /**
+     * Put event into analyzer
+     * @param {object} event
+     */
+    publicScope.put = function (event) {
+        if (privateScope.data[event]) {
+            privateScope.data[event]++;
+        } else {
+            privateScope.data[event] = 1;
+        }
+    };
+
+    /**
+     *
+     * @param {number} buffer buffer length in milliseconds
+     */
+    publicScope.setBufferPeriod = function (buffer) {
+        bufferPeriod = buffer;
+        clearInterval(privateScope.intervalHandler);
+        privateScope.intervalHandler = setInterval(publicScope.analyze, bufferPeriod);
+    };
+
+    privateScope.intervalHandler = setInterval(publicScope.analyze, bufferPeriod);
+
+    return publicScope;
+})();