2012-03-24 06:13:40 +00:00
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/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
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* in compliance with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the License
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* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.android.inputmethod.latin;
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import android.content.Context;
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import android.os.SystemClock;
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import android.util.Log;
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import com.android.inputmethod.keyboard.ProximityInfo;
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2012-06-12 21:57:40 +00:00
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import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
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2012-03-24 06:13:40 +00:00
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import com.android.inputmethod.latin.makedict.BinaryDictInputOutput;
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import com.android.inputmethod.latin.makedict.FusionDictionary;
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import com.android.inputmethod.latin.makedict.FusionDictionary.Node;
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2012-04-23 17:45:48 +00:00
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import com.android.inputmethod.latin.makedict.FusionDictionary.WeightedString;
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2012-03-24 06:13:40 +00:00
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import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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2012-04-23 17:45:48 +00:00
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import java.util.ArrayList;
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2012-03-24 06:13:40 +00:00
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import java.util.HashMap;
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import java.util.concurrent.locks.ReentrantLock;
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/**
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* Abstract base class for an expandable dictionary that can be created and updated dynamically
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* during runtime. When updated it automatically generates a new binary dictionary to handle future
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* queries in native code. This binary dictionary is written to internal storage, and potentially
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* shared across multiple ExpandableBinaryDictionary instances. Updates to each dictionary filename
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* are controlled across multiple instances to ensure that only one instance can update the same
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* dictionary at the same time.
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*/
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abstract public class ExpandableBinaryDictionary extends Dictionary {
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/** Used for Log actions from this class */
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private static final String TAG = ExpandableBinaryDictionary.class.getSimpleName();
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/** Whether to print debug output to log */
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private static boolean DEBUG = false;
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/**
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* The maximum length of a word in this dictionary. This is the same value as the binary
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* dictionary.
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*/
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protected static final int MAX_WORD_LENGTH = BinaryDictionary.MAX_WORD_LENGTH;
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/**
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* A static map of locks, each of which controls access to a single binary dictionary file. They
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* ensure that only one instance can update the same dictionary at the same time. The key for
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* this map is the filename and the value is the shared dictionary controller associated with
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* that filename.
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*/
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private static final HashMap<String, DictionaryController> sSharedDictionaryControllers =
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2012-08-21 07:34:55 +00:00
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CollectionUtils.newHashMap();
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2012-03-24 06:13:40 +00:00
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/** The application context. */
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protected final Context mContext;
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/**
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* The binary dictionary generated dynamically from the fusion dictionary. This is used to
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* answer unigram and bigram queries.
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*/
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private BinaryDictionary mBinaryDictionary;
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/** The expandable fusion dictionary used to generate the binary dictionary. */
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private FusionDictionary mFusionDictionary;
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/**
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* The name of this dictionary, used as the filename for storing the binary dictionary. Multiple
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* dictionary instances with the same filename is supported, with access controlled by
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* DictionaryController.
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*/
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private final String mFilename;
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/** Controls access to the shared binary dictionary file across multiple instances. */
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private final DictionaryController mSharedDictionaryController;
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/** Controls access to the local binary dictionary for this instance. */
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private final DictionaryController mLocalDictionaryController = new DictionaryController();
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/**
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* Abstract method for loading the unigrams and bigrams of a given dictionary in a background
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* thread.
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*/
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protected abstract void loadDictionaryAsync();
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2012-04-27 06:50:21 +00:00
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/**
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* Indicates that the source dictionary content has changed and a rebuild of the binary file is
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* required. If it returns false, the next reload will only read the current binary dictionary
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* from file. Note that the shared binary dictionary is locked when this is called.
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*/
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protected abstract boolean hasContentChanged();
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2012-03-24 06:13:40 +00:00
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/**
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* Gets the shared dictionary controller for the given filename.
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*/
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private static synchronized DictionaryController getSharedDictionaryController(
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String filename) {
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DictionaryController controller = sSharedDictionaryControllers.get(filename);
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if (controller == null) {
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controller = new DictionaryController();
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sSharedDictionaryControllers.put(filename, controller);
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}
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return controller;
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}
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/**
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* Creates a new expandable binary dictionary.
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*
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* @param context The application context of the parent.
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* @param filename The filename for this binary dictionary. Multiple dictionaries with the same
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* filename is supported.
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2012-06-27 08:31:09 +00:00
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* @param dictType the dictionary type, as a human-readable string
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2012-03-24 06:13:40 +00:00
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*/
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public ExpandableBinaryDictionary(
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2012-06-27 08:31:09 +00:00
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final Context context, final String filename, final String dictType) {
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super(dictType);
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2012-03-24 06:13:40 +00:00
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mFilename = filename;
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mContext = context;
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mBinaryDictionary = null;
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mSharedDictionaryController = getSharedDictionaryController(filename);
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clearFusionDictionary();
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}
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2012-04-23 17:45:48 +00:00
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protected static String getFilenameWithLocale(final String name, final String localeStr) {
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return name + "." + localeStr + ".dict";
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}
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2012-03-24 06:13:40 +00:00
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/**
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* Closes and cleans up the binary dictionary.
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*/
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@Override
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public void close() {
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// Ensure that no other threads are accessing the local binary dictionary.
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mLocalDictionaryController.lock();
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try {
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if (mBinaryDictionary != null) {
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mBinaryDictionary.close();
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mBinaryDictionary = null;
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}
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} finally {
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mLocalDictionaryController.unlock();
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}
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}
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/**
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* Clears the fusion dictionary on the Java side. Note: Does not modify the binary dictionary on
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* the native side.
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*/
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public void clearFusionDictionary() {
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2012-08-21 07:34:55 +00:00
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final HashMap<String, String> attributes = CollectionUtils.newHashMap();
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2012-04-27 06:50:21 +00:00
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mFusionDictionary = new FusionDictionary(new Node(),
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2012-08-21 07:34:55 +00:00
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new FusionDictionary.DictionaryOptions(attributes, false, false));
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2012-03-24 06:13:40 +00:00
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}
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/**
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* Adds a word unigram to the fusion dictionary. Call updateBinaryDictionary when all changes
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* are done to update the binary dictionary.
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*/
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// TODO: Create "cache dictionary" to cache fresh words for frequently updated dictionaries,
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// considering performance regression.
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2012-04-23 17:45:48 +00:00
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protected void addWord(final String word, final String shortcutTarget, final int frequency) {
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if (shortcutTarget == null) {
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mFusionDictionary.add(word, frequency, null);
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} else {
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// TODO: Do this in the subclass, with this class taking an arraylist.
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2012-08-21 07:34:55 +00:00
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final ArrayList<WeightedString> shortcutTargets = CollectionUtils.newArrayList();
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2012-04-23 17:45:48 +00:00
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shortcutTargets.add(new WeightedString(shortcutTarget, frequency));
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mFusionDictionary.add(word, frequency, shortcutTargets);
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}
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2012-03-24 06:13:40 +00:00
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}
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/**
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* Sets a word bigram in the fusion dictionary. Call updateBinaryDictionary when all changes are
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* done to update the binary dictionary.
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*/
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// TODO: Create "cache dictionary" to cache fresh bigrams for frequently updated dictionaries,
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// considering performance regression.
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protected void setBigram(final String prevWord, final String word, final int frequency) {
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mFusionDictionary.setBigram(prevWord, word, frequency);
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}
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2012-07-09 09:25:27 +00:00
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@Override
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public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
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final CharSequence prevWord, final ProximityInfo proximityInfo) {
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asyncReloadDictionaryIfRequired();
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if (mLocalDictionaryController.tryLock()) {
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try {
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if (mBinaryDictionary != null) {
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return mBinaryDictionary.getSuggestions(composer, prevWord, proximityInfo);
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}
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} finally {
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mLocalDictionaryController.unlock();
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}
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}
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return null;
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}
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2012-03-24 06:13:40 +00:00
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@Override
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public boolean isValidWord(final CharSequence word) {
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asyncReloadDictionaryIfRequired();
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return isValidWordInner(word);
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}
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protected boolean isValidWordInner(final CharSequence word) {
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if (mLocalDictionaryController.tryLock()) {
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try {
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2012-04-27 06:50:21 +00:00
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return isValidWordLocked(word);
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2012-03-24 06:13:40 +00:00
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} finally {
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mLocalDictionaryController.unlock();
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}
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}
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return false;
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}
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2012-04-27 06:50:21 +00:00
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protected boolean isValidWordLocked(final CharSequence word) {
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if (mBinaryDictionary == null) return false;
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return mBinaryDictionary.isValidWord(word);
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}
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protected boolean isValidBigram(final CharSequence word1, final CharSequence word2) {
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if (mBinaryDictionary == null) return false;
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return mBinaryDictionary.isValidBigram(word1, word2);
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}
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protected boolean isValidBigramInner(final CharSequence word1, final CharSequence word2) {
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if (mLocalDictionaryController.tryLock()) {
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try {
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return isValidBigramLocked(word1, word2);
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} finally {
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mLocalDictionaryController.unlock();
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}
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}
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return false;
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}
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protected boolean isValidBigramLocked(final CharSequence word1, final CharSequence word2) {
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if (mBinaryDictionary == null) return false;
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return mBinaryDictionary.isValidBigram(word1, word2);
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}
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2012-03-24 06:13:40 +00:00
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/**
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* Load the current binary dictionary from internal storage in a background thread. If no binary
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* dictionary exists, this method will generate one.
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*/
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protected void loadDictionary() {
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mLocalDictionaryController.mLastUpdateRequestTime = SystemClock.uptimeMillis();
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asyncReloadDictionaryIfRequired();
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}
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/**
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* Loads the current binary dictionary from internal storage. Assumes the dictionary file
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* exists.
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*/
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protected void loadBinaryDictionary() {
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if (DEBUG) {
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2012-05-25 18:16:30 +00:00
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Log.d(TAG, "Loading binary dictionary: " + mFilename + " request="
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2012-03-24 06:13:40 +00:00
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+ mSharedDictionaryController.mLastUpdateRequestTime + " update="
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+ mSharedDictionaryController.mLastUpdateTime);
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}
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final File file = new File(mContext.getFilesDir(), mFilename);
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final String filename = file.getAbsolutePath();
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final long length = file.length();
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// Build the new binary dictionary
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final BinaryDictionary newBinaryDictionary =
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new BinaryDictionary(mContext, filename, 0, length, true /* useFullEditDistance */,
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2012-06-27 08:31:09 +00:00
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null, mDictType);
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2012-03-24 06:13:40 +00:00
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if (mBinaryDictionary != null) {
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// Ensure all threads accessing the current dictionary have finished before swapping in
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// the new one.
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final BinaryDictionary oldBinaryDictionary = mBinaryDictionary;
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mLocalDictionaryController.lock();
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mBinaryDictionary = newBinaryDictionary;
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mLocalDictionaryController.unlock();
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oldBinaryDictionary.close();
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} else {
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mBinaryDictionary = newBinaryDictionary;
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}
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}
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/**
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* Generates and writes a new binary dictionary based on the contents of the fusion dictionary.
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*/
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private void generateBinaryDictionary() {
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if (DEBUG) {
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2012-05-25 18:16:30 +00:00
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Log.d(TAG, "Generating binary dictionary: " + mFilename + " request="
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2012-03-24 06:13:40 +00:00
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+ mSharedDictionaryController.mLastUpdateRequestTime + " update="
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+ mSharedDictionaryController.mLastUpdateTime);
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}
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loadDictionaryAsync();
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2012-04-24 16:59:11 +00:00
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final String tempFileName = mFilename + ".temp";
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2012-03-24 06:13:40 +00:00
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final File file = new File(mContext.getFilesDir(), mFilename);
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2012-04-24 16:59:11 +00:00
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final File tempFile = new File(mContext.getFilesDir(), tempFileName);
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2012-03-24 06:13:40 +00:00
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FileOutputStream out = null;
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try {
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2012-04-24 16:59:11 +00:00
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out = new FileOutputStream(tempFile);
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2012-03-24 06:13:40 +00:00
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BinaryDictInputOutput.writeDictionaryBinary(out, mFusionDictionary, 1);
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out.flush();
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out.close();
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2012-04-24 16:59:11 +00:00
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tempFile.renameTo(file);
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2012-03-24 06:13:40 +00:00
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clearFusionDictionary();
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} catch (IOException e) {
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Log.e(TAG, "IO exception while writing file: " + e);
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} catch (UnsupportedFormatException e) {
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Log.e(TAG, "Unsupported format: " + e);
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} finally {
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if (out != null) {
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try {
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out.close();
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} catch (IOException e) {
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// ignore
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}
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}
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}
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}
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/**
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2012-04-27 06:50:21 +00:00
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* Marks that the dictionary is out of date and requires a reload.
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*
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* @param requiresRebuild Indicates that the source dictionary content has changed and a rebuild
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* of the binary file is required. If not true, the next reload process will only read
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* the current binary dictionary from file.
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2012-03-24 06:13:40 +00:00
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*/
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2012-04-27 06:50:21 +00:00
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protected void setRequiresReload(final boolean requiresRebuild) {
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final long time = SystemClock.uptimeMillis();
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2012-03-24 06:13:40 +00:00
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mLocalDictionaryController.mLastUpdateRequestTime = time;
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2012-04-27 06:50:21 +00:00
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mSharedDictionaryController.mLastUpdateRequestTime = time;
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2012-03-24 06:13:40 +00:00
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if (DEBUG) {
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2012-05-25 18:16:30 +00:00
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Log.d(TAG, "Reload request: " + mFilename + ": request=" + time + " update="
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2012-03-24 06:13:40 +00:00
|
|
|
+ mSharedDictionaryController.mLastUpdateTime);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Reloads the dictionary if required. Reload will occur asynchronously in a separate thread.
|
|
|
|
*/
|
|
|
|
void asyncReloadDictionaryIfRequired() {
|
2012-05-25 18:16:30 +00:00
|
|
|
if (!isReloadRequired()) return;
|
|
|
|
if (DEBUG) {
|
|
|
|
Log.d(TAG, "Starting AsyncReloadDictionaryTask: " + mFilename);
|
|
|
|
}
|
2012-03-24 06:13:40 +00:00
|
|
|
new AsyncReloadDictionaryTask().start();
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2012-05-25 18:16:30 +00:00
|
|
|
* Reloads the dictionary if required.
|
2012-03-24 06:13:40 +00:00
|
|
|
*/
|
|
|
|
protected final void syncReloadDictionaryIfRequired() {
|
2012-05-25 18:16:30 +00:00
|
|
|
if (!isReloadRequired()) return;
|
|
|
|
syncReloadDictionaryInternal();
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Returns whether a dictionary reload is required.
|
|
|
|
*/
|
|
|
|
private boolean isReloadRequired() {
|
|
|
|
return mBinaryDictionary == null || mLocalDictionaryController.isOutOfDate();
|
|
|
|
}
|
2012-03-24 06:13:40 +00:00
|
|
|
|
2012-05-25 18:16:30 +00:00
|
|
|
/**
|
|
|
|
* Reloads the dictionary. Access is controlled on a per dictionary file basis and supports
|
|
|
|
* concurrent calls from multiple instances that share the same dictionary file.
|
|
|
|
*/
|
|
|
|
private final void syncReloadDictionaryInternal() {
|
2012-03-24 06:13:40 +00:00
|
|
|
// Ensure that only one thread attempts to read or write to the shared binary dictionary
|
|
|
|
// file at the same time.
|
|
|
|
mSharedDictionaryController.lock();
|
|
|
|
try {
|
|
|
|
final long time = SystemClock.uptimeMillis();
|
2012-05-25 18:16:30 +00:00
|
|
|
final boolean dictionaryFileExists = dictionaryFileExists();
|
|
|
|
if (mSharedDictionaryController.isOutOfDate() || !dictionaryFileExists) {
|
2012-03-24 06:13:40 +00:00
|
|
|
// If the shared dictionary file does not exist or is out of date, the first
|
|
|
|
// instance that acquires the lock will generate a new one.
|
2012-05-25 18:16:30 +00:00
|
|
|
if (hasContentChanged() || !dictionaryFileExists) {
|
|
|
|
// If the source content has changed or the dictionary does not exist, rebuild
|
|
|
|
// the binary dictionary. Empty dictionaries are supported (in the case where
|
|
|
|
// loadDictionaryAsync() adds nothing) in order to provide a uniform framework.
|
2012-04-27 06:50:21 +00:00
|
|
|
mSharedDictionaryController.mLastUpdateTime = time;
|
|
|
|
generateBinaryDictionary();
|
|
|
|
loadBinaryDictionary();
|
|
|
|
} else {
|
|
|
|
// If not, the reload request was unnecessary so revert LastUpdateRequestTime
|
|
|
|
// to LastUpdateTime.
|
|
|
|
mSharedDictionaryController.mLastUpdateRequestTime =
|
|
|
|
mSharedDictionaryController.mLastUpdateTime;
|
|
|
|
}
|
|
|
|
} else if (mBinaryDictionary == null || mLocalDictionaryController.mLastUpdateTime
|
|
|
|
< mSharedDictionaryController.mLastUpdateTime) {
|
|
|
|
// Otherwise, if the local dictionary is older than the shared dictionary, load the
|
|
|
|
// shared dictionary.
|
2012-03-24 06:13:40 +00:00
|
|
|
loadBinaryDictionary();
|
|
|
|
}
|
2012-04-27 06:50:21 +00:00
|
|
|
mLocalDictionaryController.mLastUpdateTime = time;
|
2012-03-24 06:13:40 +00:00
|
|
|
} finally {
|
|
|
|
mSharedDictionaryController.unlock();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-04-27 06:50:21 +00:00
|
|
|
// TODO: cache the file's existence so that we avoid doing a disk access each time.
|
2012-03-24 06:13:40 +00:00
|
|
|
private boolean dictionaryFileExists() {
|
|
|
|
final File file = new File(mContext.getFilesDir(), mFilename);
|
|
|
|
return file.exists();
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Thread class for asynchronously reloading and rewriting the binary dictionary.
|
|
|
|
*/
|
|
|
|
private class AsyncReloadDictionaryTask extends Thread {
|
|
|
|
@Override
|
|
|
|
public void run() {
|
2012-05-25 18:16:30 +00:00
|
|
|
syncReloadDictionaryInternal();
|
2012-03-24 06:13:40 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Lock for controlling access to a given binary dictionary and for tracking whether the
|
|
|
|
* dictionary is out of date. Can be shared across multiple dictionary instances that access the
|
|
|
|
* same filename.
|
|
|
|
*/
|
|
|
|
private static class DictionaryController extends ReentrantLock {
|
|
|
|
private volatile long mLastUpdateTime = 0;
|
|
|
|
private volatile long mLastUpdateRequestTime = 0;
|
|
|
|
|
|
|
|
private boolean isOutOfDate() {
|
|
|
|
return (mLastUpdateRequestTime > mLastUpdateTime);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|