Merge "Try decaying user history at hourly intervals."

3 files changed, 82 insertions, 1 deletions

diff --git a/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java b/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
index 7cf4f0c88..266216410 100644
--- a/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
+++ b/java/src/com/android/inputmethod/latin/personalization/DecayingExpandableBinaryDictionaryBase.java
@@ -236,4 +236,8 @@ public abstract class DecayingExpandableBinaryDictionaryBase extends ExpandableB
         // Then flush the cleared state of the dictionary on disk.
         asyncFlashAllBinaryDictionary();
     }
+
+    /* package */ void decayIfNeeded() {
+        runGCIfRequired(false /* mindsBlockByGC */);
+    }
 }
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();
+        }
+    }
+}
diff --git a/java/src/com/android/inputmethod/latin/personalization/PersonalizationHelper.java b/java/src/com/android/inputmethod/latin/personalization/PersonalizationHelper.java
index 8c9484b12..221ddeeba 100644
--- a/java/src/com/android/inputmethod/latin/personalization/PersonalizationHelper.java
+++ b/java/src/com/android/inputmethod/latin/personalization/PersonalizationHelper.java
@@ -29,7 +29,6 @@ import java.util.concurrent.ConcurrentHashMap;
 public class PersonalizationHelper {
     private static final String TAG = PersonalizationHelper.class.getSimpleName();
     private static final boolean DEBUG = false;
-
     private static final ConcurrentHashMap<String, SoftReference<UserHistoryDictionary>>
             sLangUserHistoryDictCache = CollectionUtils.newConcurrentHashMap();
 
@@ -62,6 +61,18 @@ public class PersonalizationHelper {
         }
     }
 
+    public static void tryDecayingAllOpeningUserHistoryDictionary() {
+        for (final ConcurrentHashMap.Entry<String, SoftReference<UserHistoryDictionary>> entry
+                : sLangUserHistoryDictCache.entrySet()) {
+            if (entry.getValue() != null) {
+                final UserHistoryDictionary dict = entry.getValue().get();
+                if (dict != null) {
+                    dict.decayIfNeeded();
+                }
+            }
+        }
+    }
+
     public static void registerPersonalizationDictionaryUpdateSession(final Context context,
             final PersonalizationDictionaryUpdateSession session, String locale) {
         final PersonalizationPredictionDictionary predictionDictionary =