Extract CachedDeviceState from BinderCallsStats
Add a service that tracks the device state properties which are
interesting to System Server telemetry services. Allows the services to
share this code and have consistent state information.
Test: Unit tests and manually tested
Change-Id: Ia5c78c45a55414a0c5c46202db2a37283b50a703
diff --git a/services/core/java/com/android/server/CachedDeviceStateService.java b/services/core/java/com/android/server/CachedDeviceStateService.java
new file mode 100644
index 0000000..38269d3
--- /dev/null
+++ b/services/core/java/com/android/server/CachedDeviceStateService.java
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2018 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;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.os.BatteryManager;
+import android.os.BatteryManagerInternal;
+import android.os.OsProtoEnums;
+import android.os.PowerManager;
+import android.util.Slog;
+
+import com.android.internal.os.CachedDeviceState;
+
+/**
+ * Tracks changes to the device state (e.g. charging/on battery, screen on/off) to share it with
+ * the System Server telemetry services.
+ *
+ * @hide Only for use within the system server.
+ */
+public class CachedDeviceStateService extends SystemService {
+ private static final String TAG = "CachedDeviceStateService";
+ private final CachedDeviceState mDeviceState = new CachedDeviceState();
+ private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
+ @Override
+ public void onReceive(Context context, Intent intent) {
+ switch (intent.getAction()) {
+ case Intent.ACTION_BATTERY_CHANGED:
+ mDeviceState.setCharging(
+ intent.getIntExtra(BatteryManager.EXTRA_PLUGGED,
+ OsProtoEnums.BATTERY_PLUGGED_NONE)
+ != OsProtoEnums.BATTERY_PLUGGED_NONE);
+ break;
+ case Intent.ACTION_SCREEN_ON:
+ mDeviceState.setScreenInteractive(true);
+ break;
+ case Intent.ACTION_SCREEN_OFF:
+ mDeviceState.setScreenInteractive(false);
+ break;
+ }
+ }
+ };
+
+ public CachedDeviceStateService(Context context) {
+ super(context);
+ }
+
+ @Override
+ public void onStart() {
+ publishLocalService(CachedDeviceState.Readonly.class, mDeviceState.getReadonlyClient());
+ }
+
+ @Override
+ public void onBootPhase(int phase) {
+ if (SystemService.PHASE_SYSTEM_SERVICES_READY == phase) {
+ final IntentFilter filter = new IntentFilter();
+ filter.addAction(Intent.ACTION_BATTERY_CHANGED);
+ filter.addAction(Intent.ACTION_SCREEN_ON);
+ filter.addAction(Intent.ACTION_SCREEN_OFF);
+ filter.setPriority(IntentFilter.SYSTEM_HIGH_PRIORITY);
+ getContext().registerReceiver(mBroadcastReceiver, filter);
+ mDeviceState.setCharging(queryIsCharging());
+ mDeviceState.setScreenInteractive(queryScreenInteractive(getContext()));
+ }
+ }
+
+ private boolean queryIsCharging() {
+ final BatteryManagerInternal batteryManager =
+ LocalServices.getService(BatteryManagerInternal.class);
+ if (batteryManager == null) {
+ Slog.wtf(TAG, "BatteryManager null while starting CachedDeviceStateService");
+ // Default to true to not collect any data.
+ return true;
+ } else {
+ return batteryManager.getPlugType() != OsProtoEnums.BATTERY_PLUGGED_NONE;
+ }
+ }
+
+ private boolean queryScreenInteractive(Context context) {
+ final PowerManager powerManager = context.getSystemService(PowerManager.class);
+ if (powerManager == null) {
+ Slog.wtf(TAG, "PowerManager null while starting CachedDeviceStateService");
+ return false;
+ } else {
+ return powerManager.isInteractive();
+ }
+ }
+}