[automerge] Add HotwordMetricsLogger for statistics logging. 2p: b8c2da2587

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17184397

Bug: 207717787
Change-Id: I62f56158ce443eebb85aed8721e2f928487e1d31
Merged-In: If436aae1b4ebdb06c7bd5a1c0b8d6df4e94488cd

services/voiceinteraction/java/com/android/server/voiceinteraction/HotwordMetricsLogger.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * 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.
+ */
+
+package com.android.server.voiceinteraction;
+
+import com.android.internal.util.FrameworkStatsLog;
+
+/**
+ * A utility class for logging hotword statistics event.
+ */
+public final class HotwordMetricsLogger {
+
+    private HotwordMetricsLogger() {
+        // Class only contains static utility functions, and should not be instantiated
+    }
+
+    /**
+     * Logs information related to create hotword detector.
+     */
+    public static void writeDetectorCreateEvent(int detectorType, boolean isCreated, int uid) {
+        FrameworkStatsLog.write(FrameworkStatsLog.HOTWORD_DETECTOR_CREATE_REQUESTED, detectorType,
+                isCreated, uid);
+    }
+
+    /**
+     * Logs information related to hotword detection service init result.
+     */
+    public static void writeServiceInitResultEvent(int detectorType, int result) {
+        FrameworkStatsLog.write(FrameworkStatsLog.HOTWORD_DETECTION_SERVICE_INIT_RESULT_REPORTED,
+                detectorType, result);
+    }
+
+    /**
+     * Logs information related to hotword detection service restarting.
+     */
+    public static void writeServiceRestartEvent(int detectorType, int reason) {
+        FrameworkStatsLog.write(FrameworkStatsLog.HOTWORD_DETECTION_SERVICE_RESTARTED,
+                detectorType, reason);
+    }
+
+    /**
+     * Logs information related to keyphrase trigger.
+     */
+    public static void writeKeyphraseTriggerEvent(int detectorType, int result) {
+        FrameworkStatsLog.write(FrameworkStatsLog.HOTWORD_DETECTOR_KEYPHRASE_TRIGGERED,
+                detectorType, result);
+    }
+
+    /**
+     * Logs information related to hotword detector events.
+     */
+    public static void writeDetectorEvent(int detectorType, int event, int uid) {
+        FrameworkStatsLog.write(FrameworkStatsLog.HOTWORD_DETECTOR_EVENTS,
+                detectorType, event, uid);
+    }
+}