Delay syncs for idle apps

Apps that haven't been in use for a while and are considered idle
are not synced until the device is charging or the app is used.

Bug: 20066058
Change-Id: I3471e3a11edae04777163b0dbd74e86495743caa

1 files changed, 89 insertions, 0 deletions

diff --git a/services/core/java/com/android/server/content/AppIdleMonitor.java b/services/core/java/com/android/server/content/AppIdleMonitor.java
new file mode 100644
index 0000000..9598de8
--- /dev/null
+++ b/services/core/java/com/android/server/content/AppIdleMonitor.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2015 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.content;
+
+import android.app.usage.UsageStatsManagerInternal;
+import android.app.usage.UsageStatsManagerInternal.AppIdleStateChangeListener;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.os.BatteryManager;
+import android.os.UserHandle;
+
+import com.android.server.LocalServices;
+
+/**
+ * Helper to listen for app idle and charging status changes and restart backed off
+ * sync operations.
+ */
+class AppIdleMonitor implements AppIdleStateChangeListener {
+
+    private final SyncManager mSyncManager;
+    private final UsageStatsManagerInternal mUsageStats;
+    final BatteryManager mBatteryManager;
+    /** Is the device currently plugged into power. */
+    private boolean mPluggedIn;
+
+    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            onPluggedIn(mBatteryManager.isCharging());
+        }
+    };
+
+    AppIdleMonitor(SyncManager syncManager, Context context) {
+        mSyncManager = syncManager;
+        mUsageStats = LocalServices.getService(UsageStatsManagerInternal.class);
+        mUsageStats.addAppIdleStateChangeListener(this);
+        mBatteryManager = context.getSystemService(BatteryManager.class);
+        mPluggedIn = isPowered();
+        registerReceivers(context);
+    }
+
+    private void registerReceivers(Context context) {
+        // Monitor battery charging state
+        IntentFilter filter = new IntentFilter(BatteryManager.ACTION_CHARGING);
+        filter.addAction(BatteryManager.ACTION_DISCHARGING);
+        context.registerReceiver(mReceiver, filter);
+    }
+
+    private boolean isPowered() {
+        return mBatteryManager.isCharging();
+    }
+
+    void onPluggedIn(boolean pluggedIn) {
+        if (mPluggedIn == pluggedIn) {
+            return;
+        }
+        mPluggedIn = pluggedIn;
+        if (mPluggedIn) {
+            mSyncManager.onAppNotIdle(null, UserHandle.USER_ALL);
+        }
+    }
+
+    boolean isAppIdle(String packageName, int userId) {
+        return !mPluggedIn && mUsageStats.isAppIdle(packageName, userId);
+    }
+
+    @Override
+    public void onAppIdleStateChanged(String packageName, int userId, boolean idle) {
+        // Don't care if the app is becoming idle
+        if (idle) return;
+        mSyncManager.onAppNotIdle(packageName, userId);
+    }
+}