Cache UserHistoryDictionary for each language (a836808f) · Commits · e / os / android_packages_inputmethods_LatinIME

java/src/com/android/inputmethod/latin/LatinIME.java

+1 −1

Original line number	Diff line number	Diff line
		@@ -497,7 +497,7 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
		// Note that the calling sequence of onCreate() and onCurrentInputMethodSubtypeChanged()
		// is not guaranteed. It may even be called at the same time on a different thread.
		if (null == mPrefs) mPrefs = PreferenceManager.getDefaultSharedPreferences(this);
		mUserHistoryDictionary = new UserHistoryDictionary(
		mUserHistoryDictionary = UserHistoryDictionary.getInstance(
		this, localeStr, Suggest.DIC_USER_HISTORY, mPrefs);
		mSuggest.setUserHistoryDictionary(mUserHistoryDictionary);
		}

java/src/com/android/inputmethod/latin/UserHistoryDictionary.java

+189 −125

Original line number	Diff line number	Diff line
		@@ -29,7 +29,9 @@ import android.util.Log;

		import com.android.inputmethod.latin.UserHistoryForgettingCurveUtils.ForgettingCurveParams;

		import java.lang.ref.SoftReference;
		import java.util.HashMap;
		import java.util.concurrent.ConcurrentHashMap;

		/**
		* Locally gathers stats about the words user types and various other signals like auto-correction
		@@ -38,6 +40,7 @@ import java.util.HashMap;
		public class UserHistoryDictionary extends ExpandableDictionary {
		private static final String TAG = "UserHistoryDictionary";
		public static final boolean DBG_SAVE_RESTORE = false;
		public static final boolean PROFILE_SAVE_RESTORE = LatinImeLogger.sDBG;

		/** Any pair being typed or picked */
		private static final int FREQUENCY_FOR_TYPED = 2;
		@@ -77,13 +80,14 @@ public class UserHistoryDictionary extends ExpandableDictionary {
		/** Locale for which this user history dictionary is storing words */
		private final String mLocale;

		private UserHistoryDictionaryBigramList mBigramList =
		private final UserHistoryDictionaryBigramList mBigramList =
		new UserHistoryDictionaryBigramList();
		private final Object mPendingWritesLock = new Object();
		private static volatile boolean sUpdatingDB = false;
		private final SharedPreferences mPrefs;

		private final static HashMap<String, String> sDictProjectionMap;
		private final static ConcurrentHashMap<String, SoftReference<UserHistoryDictionary>>
		sLangDictCache = new ConcurrentHashMap<String, SoftReference<UserHistoryDictionary>>();

		static {
		sDictProjectionMap = new HashMap<String, String>();
		@@ -107,7 +111,26 @@ public class UserHistoryDictionary extends ExpandableDictionary {
		sDeleteHistoryBigrams = deleteHistoryBigram;
		}

		public UserHistoryDictionary(final Context context, final String locale, final int dicTypeId,
		public synchronized static UserHistoryDictionary getInstance(
		final Context context, final String locale,
		final int dictTypeId, final SharedPreferences sp) {
		if (sLangDictCache.containsKey(locale)) {
		final SoftReference<UserHistoryDictionary> ref = sLangDictCache.get(locale);
		final UserHistoryDictionary dict = ref == null ? null : ref.get();
		if (dict != null) {
		if (PROFILE_SAVE_RESTORE) {
		Log.w(TAG, "Use cached UserHistoryDictionary for " + locale);
		}
		return dict;
		}
		}
		final UserHistoryDictionary dict =
		new UserHistoryDictionary(context, locale, dictTypeId, sp);
		sLangDictCache.put(locale, new SoftReference<UserHistoryDictionary>(dict));
		return dict;
		}

		private UserHistoryDictionary(final Context context, final String locale, final int dicTypeId,
		SharedPreferences sp) {
		super(context, dicTypeId);
		mLocale = locale;
		@@ -123,12 +146,13 @@ public class UserHistoryDictionary extends ExpandableDictionary {
		@Override
		public void close() {
		flushPendingWrites();
		SettingsValues.setLastUserHistoryWriteTime(mPrefs, mLocale);
		// Don't close the database as locale changes will require it to be reopened anyway
		// Also, the database is written to somewhat frequently, so it needs to be kept alive
		// throughout the life of the process.
		// mOpenHelper.close();
		super.close();
		// Ignore close because we cache UserHistoryDictionary for each language. See getInstance()
		// above.
		// super.close();
		}

		/**
		@@ -160,7 +184,7 @@ public class UserHistoryDictionary extends ExpandableDictionary {
		} else {
		freq = super.setBigramAndGetFrequency(word1, word2, new ForgettingCurveParams(isValid));
		}
		synchronized (mPendingWritesLock) {
		synchronized (mBigramList) {
		mBigramList.addBigram(word1, word2);
		}

		@@ -168,7 +192,7 @@ public class UserHistoryDictionary extends ExpandableDictionary {
		}

		public boolean cancelAddingUserHistory(String word1, String word2) {
		synchronized (mPendingWritesLock) {
		synchronized (mBigramList) {
		if (mBigramList.removeBigram(word1, word2)) {
		return super.removeBigram(word1, word2);
		}
		@@ -180,19 +204,17 @@ public class UserHistoryDictionary extends ExpandableDictionary {
		* Schedules a background thread to write any pending words to the database.
		*/
		private void flushPendingWrites() {
		synchronized (mPendingWritesLock) {
		synchronized (mBigramList) {
		// Nothing pending? Return
		if (mBigramList.isEmpty()) return;
		// Create a background thread to write the pending entries
		new UpdateDbTask(sOpenHelper, mBigramList, mLocale, this).execute();
		// Create a new map for writing new entries into while the old one is written to db
		mBigramList = new UserHistoryDictionaryBigramList();
		new UpdateDbTask(sOpenHelper, mBigramList, mLocale, this, mPrefs).execute();
		}
		}

		/ Used for testing purpose /
		void waitUntilUpdateDBDone() {
		synchronized (mPendingWritesLock) {
		synchronized (mBigramList) {
		while (sUpdatingDB) {
		try {
		Thread.sleep(100);
		@@ -205,6 +227,7 @@ public class UserHistoryDictionary extends ExpandableDictionary {

		@Override
		public void loadDictionaryAsync() {
		synchronized(mBigramList) {
		final long last = SettingsValues.getLastUserHistoryWriteTime(mPrefs, mLocale);
		final long now = System.currentTimeMillis();
		// Load the words that correspond to the current input locale
		@@ -232,14 +255,18 @@ public class UserHistoryDictionary extends ExpandableDictionary {
		super.setBigramAndGetFrequency(
		word1, word2, new ForgettingCurveParams(fc, now, last));
		}
		synchronized(mPendingWritesLock) {
		mBigramList.addBigram(word1, word2, (byte)fc);
		}
		cursor.moveToNext();
		}
		}
		} finally {
		cursor.close();
		if (PROFILE_SAVE_RESTORE) {
		final long diff = System.currentTimeMillis() - now;
		Log.w(TAG, "PROF: Load User HistoryDictionary: "
		+ mLocale + ", " + diff + "ms.");
		}
		}
		}
		}

		@@ -317,14 +344,16 @@ public class UserHistoryDictionary extends ExpandableDictionary {
		private final DatabaseHelper mDbHelper;
		private final String mLocale;
		private final UserHistoryDictionary mUserHistoryDictionary;
		private final SharedPreferences mPrefs;

		public UpdateDbTask(
		DatabaseHelper openHelper, UserHistoryDictionaryBigramList pendingWrites,
		String locale, UserHistoryDictionary dict) {
		String locale, UserHistoryDictionary dict, SharedPreferences prefs) {
		mBigramList = pendingWrites;
		mLocale = locale;
		mDbHelper = openHelper;
		mUserHistoryDictionary = dict;
		mPrefs = prefs;
		}

		/** Prune any old data if the database is getting too big. */
		@@ -363,6 +392,11 @@ public class UserHistoryDictionary extends ExpandableDictionary {

		@Override
		protected Void doInBackground(Void... v) {
		synchronized(mBigramList) {
		final long now = PROFILE_SAVE_RESTORE ? System.currentTimeMillis() : 0;
		int profTotal = 0;
		int profInsert = 0;
		int profDelete = 0;
		SQLiteDatabase db = null;
		try {
		db = mDbHelper.getWritableDatabase();
		@@ -382,11 +416,24 @@ public class UserHistoryDictionary extends ExpandableDictionary {
		for (String word1 : mBigramList.keySet()) {
		final HashMap<String, Byte> word1Bigrams = mBigramList.getBigrams(word1);
		for (String word2 : word1Bigrams.keySet()) {
		// Get new frequency. Do not insert shortcuts/bigrams which freq is "-1".
		if (PROFILE_SAVE_RESTORE) {
		++profTotal;
		}
		// Get new frequency. Do not insert unigrams/bigrams which freq is "-1".
		final int freq; // -1, or 0~255
		if (word1 == null) {
		if (word1 == null) { // unigram
		freq = FREQUENCY_FOR_TYPED;
		} else {
		final byte prevFc = word1Bigrams.get(word2);
		if (prevFc == FREQUENCY_FOR_TYPED) {
		// No need to update since we found no changes for this entry.
		// Just skip to the next entry.
		if (DBG_SAVE_RESTORE) {
		Log.d(TAG, "Skip update user history: " + word1 + "," + word2
		+ "," + prevFc);
		}
		continue;
		}
		} else { // bigram
		final NextWord nw = mUserHistoryDictionary.getBigramWord(word1, word2);
		if (nw != null) {
		final ForgettingCurveParams fcp = nw.getFcParams();
		@@ -397,8 +444,8 @@ public class UserHistoryDictionary extends ExpandableDictionary {
		// No need to update since we found no changes for this entry.
		// Just skip to the next entry.
		if (DBG_SAVE_RESTORE) {
		Log.d(TAG, "Skip update user history: " + word1 + "," + word2
		+ "," + prevFc);
		Log.d(TAG, "Skip update user history: " + word1 + ","
		+ word2 + "," + prevFc);
		}
		continue;
		} else if (UserHistoryForgettingCurveUtils.
		@@ -431,6 +478,9 @@ public class UserHistoryDictionary extends ExpandableDictionary {

		final int pairId;
		if (c.moveToFirst()) {
		if (PROFILE_SAVE_RESTORE) {
		++profDelete;
		}
		// Delete existing pair
		pairId = c.getInt(c.getColumnIndex(MAIN_COLUMN_ID));
		db.delete(FREQ_TABLE_NAME, FREQ_COLUMN_PAIR_ID + "=?",
		@@ -442,6 +492,9 @@ public class UserHistoryDictionary extends ExpandableDictionary {
		pairId = pairIdLong.intValue();
		}
		if (freq > 0) {
		if (PROFILE_SAVE_RESTORE) {
		++profInsert;
		}
		if (DBG_SAVE_RESTORE) {
		Log.d(TAG, "--- Save user history: " + word1 + ", " + word2
		+ mLocale + "," + this);
		@@ -449,6 +502,9 @@ public class UserHistoryDictionary extends ExpandableDictionary {
		// Insert new frequency
		db.insert(FREQ_TABLE_NAME, null,
		getFrequencyContentValues(pairId, freq));
		// Update an existing bigram entry in mBigramList too in order to
		// synchronize the SQL DB and mBigramList.
		mBigramList.updateBigram(word1, word2, (byte)freq);
		}
		} finally {
		if (c != null) {
		@@ -459,9 +515,17 @@ public class UserHistoryDictionary extends ExpandableDictionary {
		}

		checkPruneData(db);
		// Save the timestamp after we finish writing the SQL DB.
		SettingsValues.setLastUserHistoryWriteTime(mPrefs, mLocale);
		sUpdatingDB = false;

		if (PROFILE_SAVE_RESTORE) {
		final long diff = System.currentTimeMillis() - now;
		Log.w(TAG, "PROF: Write User HistoryDictionary: " + mLocale + ", "+ diff
		+ "ms. Total: " + profTotal + ". Insert: " + profInsert + ". Delete: "
		+ profDelete);
		}
		return null;
		} // synchronized
		}

		private static ContentValues getContentValues(String word1, String word2, String locale) {

java/src/com/android/inputmethod/latin/UserHistoryDictionaryBigramList.java

+26 −1

Original line number	Diff line number	Diff line
		@@ -39,13 +39,19 @@ public class UserHistoryDictionaryBigramList {
		mBigramMap.clear();
		}

		/**
		* Called when the user typed a word.
		*/
		public void addBigram(String word1, String word2) {
		addBigram(word1, word2, FORGETTING_CURVE_INITIAL_VALUE);
		}

		/**
		* Called when loaded from the SQL DB.
		*/
		public void addBigram(String word1, String word2, byte fcValue) {
		if (UserHistoryDictionary.DBG_SAVE_RESTORE) {
		Log.d(TAG, "--- add bigram: " + word1 + ", " + word2);
		Log.d(TAG, "--- add bigram: " + word1 + ", " + word2 + ", " + fcValue);
		}
		final HashMap<String, Byte> map;
		if (mBigramMap.containsKey(word1)) {
		@@ -60,6 +66,25 @@ public class UserHistoryDictionaryBigramList {
		}
		}

		/**
		* Called when inserted to the SQL DB.
		*/
		public void updateBigram(String word1, String word2, byte fcValue) {
		if (UserHistoryDictionary.DBG_SAVE_RESTORE) {
		Log.d(TAG, "--- update bigram: " + word1 + ", " + word2 + ", " + fcValue);
		}
		final HashMap<String, Byte> map;
		if (mBigramMap.containsKey(word1)) {
		map = mBigramMap.get(word1);
		} else {
		return;
		}
		if (!map.containsKey(word2)) {
		return;
		}
		map.put(word2, fcValue);
		}

		public int size() {
		return mSize;
		}