Try decaying user history at hourly intervals.

Bug: 6669677

Change-Id: Ib465fa7e1a7f289a07843535ba89d0dd5259e803

1 files changed, 66 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/latin/personalization/DictionaryDecayBroadcastReciever.java b/java/src/com/android/inputmethod/latin/personalization/DictionaryDecayBroadcastReciever.java
new file mode 100644
index 000000000..e9ca662e7
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/personalization/DictionaryDecayBroadcastReciever.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2013 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.inputmethod.latin.personalization;
+
+import android.app.AlarmManager;
+import android.app.PendingIntent;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Broadcast receiver for periodically updating decaying dictionaries.
+ */
+public class DictionaryDecayBroadcastReciever extends BroadcastReceiver {
+    /**
+     * The root domain for the personalization.
+     */
+    private static final String PERSONALIZATION_DOMAIN =
+            "com.android.inputmethod.latin.personalization";
+
+    /**
+     * The action of the intent to tell the time to decay dictionaries.
+     */
+    private static final String DICTIONARY_DECAY_INTENT_ACTION =
+            PERSONALIZATION_DOMAIN + ".DICT_DECAY";
+
+    /**
+     * Interval to update for decaying dictionaries.
+     */
+    private static final long DICTIONARY_DECAY_INTERVAL = TimeUnit.MINUTES.toMillis(60);
+
+    public static void setUpIntervalAlarmForDictionaryDecaying(Context context) {
+        AlarmManager alarmManager = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
+        final Intent updateIntent = new Intent(DICTIONARY_DECAY_INTENT_ACTION);
+        updateIntent.setClass(context, DictionaryDecayBroadcastReciever.class);
+        final long alarmTime =  System.currentTimeMillis() + DICTIONARY_DECAY_INTERVAL;
+        final PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0 /* requestCode */,
+                updateIntent, PendingIntent.FLAG_CANCEL_CURRENT);
+        if (null != alarmManager) alarmManager.setInexactRepeating(AlarmManager.RTC,
+                alarmTime, DICTIONARY_DECAY_INTERVAL, pendingIntent);
+    }
+
+    @Override
+    public void onReceive(final Context context, final Intent intent) {
+        final String action = intent.getAction();
+        if (action.equals(DICTIONARY_DECAY_INTENT_ACTION)) {
+            PersonalizationHelper.tryDecayingAllOpeningUserHistoryDictionary();
+        }
+    }
+}