673 lines
25 KiB
Java
673 lines
25 KiB
Java
/*
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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");
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* you may not use this file except in compliance with the License.
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* 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
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under 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.util.Log;
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import com.android.inputmethod.annotations.UsedForTesting;
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import com.android.inputmethod.keyboard.ProximityInfo;
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import com.android.inputmethod.latin.makedict.DictionaryHeader;
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import com.android.inputmethod.latin.makedict.FormatSpec;
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import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
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import com.android.inputmethod.latin.makedict.WordProperty;
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import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
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import com.android.inputmethod.latin.settings.SettingsValuesForSuggestion;
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import com.android.inputmethod.latin.utils.CombinedFormatUtils;
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import com.android.inputmethod.latin.utils.DistracterFilter;
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import com.android.inputmethod.latin.utils.ExecutorUtils;
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import com.android.inputmethod.latin.utils.FileUtils;
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import com.android.inputmethod.latin.utils.LanguageModelParam;
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import java.io.File;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.Locale;
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import java.util.Map;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.concurrent.locks.Lock;
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import java.util.concurrent.locks.ReentrantReadWriteLock;
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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.
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*/
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abstract public class ExpandableBinaryDictionary extends Dictionary {
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private static final boolean DEBUG = false;
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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 final boolean DBG_STRESS_TEST = false;
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private static final int TIMEOUT_FOR_READ_OPS_IN_MILLISECONDS = 100;
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private static final int DEFAULT_MAX_UNIGRAM_COUNT = 10000;
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private static final int DEFAULT_MAX_BIGRAM_COUNT = 10000;
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/**
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* The maximum length of a word in this dictionary.
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*/
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protected static final int MAX_WORD_LENGTH = Constants.DICTIONARY_MAX_WORD_LENGTH;
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private static final int DICTIONARY_FORMAT_VERSION = FormatSpec.VERSION4;
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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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/**
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* The name of this dictionary, used as a part of the filename for storing the binary
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* dictionary.
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*/
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private final String mDictName;
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/** Dictionary locale */
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private final Locale mLocale;
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/** Dictionary file */
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private final File mDictFile;
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/** Indicates whether a task for reloading the dictionary has been scheduled. */
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private final AtomicBoolean mIsReloading;
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/** Indicates whether the current dictionary needs to be recreated. */
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private boolean mNeedsToRecreate;
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private final ReentrantReadWriteLock mLock;
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private Map<String, String> mAdditionalAttributeMap = null;
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/* A extension for a binary dictionary file. */
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protected static final String DICT_FILE_EXTENSION = ".dict";
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/**
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* Abstract method for loading initial contents of a given dictionary.
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*/
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protected abstract void loadInitialContentsLocked();
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private boolean matchesExpectedBinaryDictFormatVersionForThisType(final int formatVersion) {
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return formatVersion == FormatSpec.VERSION4;
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}
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private boolean needsToMigrateDictionary(final int formatVersion) {
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// When we bump up the dictionary format version, the old version should be added to here
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// for supporting migration. Note that native code has to support reading such formats.
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return formatVersion == FormatSpec.VERSION4_ONLY_FOR_TESTING;
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}
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public boolean isValidDictionaryLocked() {
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return mBinaryDictionary.isValidDictionary();
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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 dictName The name of the dictionary. Multiple instances with the same
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* name is supported.
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* @param locale the dictionary locale.
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* @param dictType the dictionary type, as a human-readable string
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* @param dictFile dictionary file path. if null, use default dictionary path based on
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* dictionary type.
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*/
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public ExpandableBinaryDictionary(final Context context, final String dictName,
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final Locale locale, final String dictType, final File dictFile) {
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super(dictType);
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mDictName = dictName;
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mContext = context;
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mLocale = locale;
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mDictFile = getDictFile(context, dictName, dictFile);
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mBinaryDictionary = null;
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mIsReloading = new AtomicBoolean();
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mNeedsToRecreate = false;
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mLock = new ReentrantReadWriteLock();
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}
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public static File getDictFile(final Context context, final String dictName,
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final File dictFile) {
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return (dictFile != null) ? dictFile
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: new File(context.getFilesDir(), dictName + DICT_FILE_EXTENSION);
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}
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public static String getDictName(final String name, final Locale locale,
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final File dictFile) {
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return dictFile != null ? dictFile.getName() : name + "." + locale.toString();
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}
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private void asyncExecuteTaskWithWriteLock(final Runnable task) {
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asyncExecuteTaskWithLock(mLock.writeLock(), task);
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}
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private void asyncExecuteTaskWithLock(final Lock lock, final Runnable task) {
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ExecutorUtils.getExecutor(mDictName).execute(new Runnable() {
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@Override
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public void run() {
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lock.lock();
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try {
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task.run();
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} finally {
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lock.unlock();
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}
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}
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});
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}
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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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asyncExecuteTaskWithWriteLock(new Runnable() {
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@Override
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public void run() {
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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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}
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});
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}
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protected Map<String, String> getHeaderAttributeMap() {
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HashMap<String, String> attributeMap = new HashMap<>();
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if (mAdditionalAttributeMap != null) {
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attributeMap.putAll(mAdditionalAttributeMap);
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}
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attributeMap.put(DictionaryHeader.DICTIONARY_ID_KEY, mDictName);
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attributeMap.put(DictionaryHeader.DICTIONARY_LOCALE_KEY, mLocale.toString());
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attributeMap.put(DictionaryHeader.DICTIONARY_VERSION_KEY,
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String.valueOf(TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis())));
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attributeMap.put(DictionaryHeader.MAX_UNIGRAM_COUNT_KEY,
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String.valueOf(DEFAULT_MAX_UNIGRAM_COUNT));
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attributeMap.put(DictionaryHeader.MAX_BIGRAM_COUNT_KEY,
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String.valueOf(DEFAULT_MAX_BIGRAM_COUNT));
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return attributeMap;
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}
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private void removeBinaryDictionary() {
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asyncExecuteTaskWithWriteLock(new Runnable() {
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@Override
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public void run() {
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removeBinaryDictionaryLocked();
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}
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});
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}
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private void removeBinaryDictionaryLocked() {
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if (mBinaryDictionary != null) {
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mBinaryDictionary.close();
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}
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if (mDictFile.exists() && !FileUtils.deleteRecursively(mDictFile)) {
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Log.e(TAG, "Can't remove a file: " + mDictFile.getName());
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}
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mBinaryDictionary = null;
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}
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private void openBinaryDictionaryLocked() {
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mBinaryDictionary = new BinaryDictionary(
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mDictFile.getAbsolutePath(), 0 /* offset */, mDictFile.length(),
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true /* useFullEditDistance */, mLocale, mDictType, true /* isUpdatable */);
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}
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private void createOnMemoryBinaryDictionaryLocked() {
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mBinaryDictionary = new BinaryDictionary(
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mDictFile.getAbsolutePath(), true /* useFullEditDistance */, mLocale, mDictType,
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DICTIONARY_FORMAT_VERSION, getHeaderAttributeMap());
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}
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public void clear() {
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asyncExecuteTaskWithWriteLock(new Runnable() {
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@Override
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public void run() {
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removeBinaryDictionaryLocked();
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createOnMemoryBinaryDictionaryLocked();
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}
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});
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}
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/**
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* Check whether GC is needed and run GC if required.
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*/
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protected void runGCIfRequired(final boolean mindsBlockByGC) {
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asyncExecuteTaskWithWriteLock(new Runnable() {
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@Override
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public void run() {
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if (mBinaryDictionary == null) {
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return;
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}
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runGCIfRequiredLocked(mindsBlockByGC);
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}
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});
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}
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protected void runGCIfRequiredLocked(final boolean mindsBlockByGC) {
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if (mBinaryDictionary.needsToRunGC(mindsBlockByGC)) {
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mBinaryDictionary.flushWithGC();
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}
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}
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/**
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* Adds unigram information of a word to the dictionary. May overwrite an existing entry.
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*/
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public void addUnigramEntryWithCheckingDistracter(final String word, final int frequency,
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final String shortcutTarget, final int shortcutFreq, final boolean isNotAWord,
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final boolean isBlacklisted, final int timestamp,
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final DistracterFilter distracterFilter) {
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reloadDictionaryIfRequired();
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asyncExecuteTaskWithWriteLock(new Runnable() {
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@Override
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public void run() {
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if (mBinaryDictionary == null) {
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return;
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}
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if (distracterFilter.isDistracterToWordsInDictionaries(
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PrevWordsInfo.EMPTY_PREV_WORDS_INFO, word, mLocale)) {
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// The word is a distracter.
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return;
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}
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runGCIfRequiredLocked(true /* mindsBlockByGC */);
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addUnigramLocked(word, frequency, shortcutTarget, shortcutFreq,
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isNotAWord, isBlacklisted, timestamp);
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}
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});
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}
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protected void addUnigramLocked(final String word, final int frequency,
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final String shortcutTarget, final int shortcutFreq, final boolean isNotAWord,
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final boolean isBlacklisted, final int timestamp) {
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if (!mBinaryDictionary.addUnigramEntry(word, frequency, shortcutTarget, shortcutFreq,
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false /* isBeginningOfSentence */, isNotAWord, isBlacklisted, timestamp)) {
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Log.e(TAG, "Cannot add unigram entry. word: " + word);
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}
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}
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/**
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* Dynamically remove the unigram entry from the dictionary.
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*/
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public void removeUnigramEntryDynamically(final String word) {
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reloadDictionaryIfRequired();
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asyncExecuteTaskWithWriteLock(new Runnable() {
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@Override
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public void run() {
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if (mBinaryDictionary == null) {
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return;
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}
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runGCIfRequiredLocked(true /* mindsBlockByGC */);
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if (!mBinaryDictionary.removeUnigramEntry(word)) {
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if (DEBUG) {
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Log.i(TAG, "Cannot remove unigram entry: " + word);
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}
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}
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}
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});
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}
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/**
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* Adds n-gram information of a word to the dictionary. May overwrite an existing entry.
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*/
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public void addNgramEntry(final PrevWordsInfo prevWordsInfo, final String word,
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final int frequency, final int timestamp) {
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reloadDictionaryIfRequired();
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asyncExecuteTaskWithWriteLock(new Runnable() {
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@Override
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public void run() {
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if (mBinaryDictionary == null) {
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return;
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}
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runGCIfRequiredLocked(true /* mindsBlockByGC */);
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addNgramEntryLocked(prevWordsInfo, word, frequency, timestamp);
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}
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});
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}
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protected void addNgramEntryLocked(final PrevWordsInfo prevWordsInfo, final String word,
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final int frequency, final int timestamp) {
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if (!mBinaryDictionary.addNgramEntry(prevWordsInfo, word, frequency, timestamp)) {
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if (DEBUG) {
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Log.i(TAG, "Cannot add n-gram entry.");
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Log.i(TAG, " PrevWordsInfo: " + prevWordsInfo + ", word: " + word);
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}
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}
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}
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/**
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* Dynamically remove the n-gram entry in the dictionary.
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*/
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@UsedForTesting
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public void removeNgramDynamically(final PrevWordsInfo prevWordsInfo, final String word) {
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reloadDictionaryIfRequired();
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asyncExecuteTaskWithWriteLock(new Runnable() {
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@Override
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public void run() {
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if (mBinaryDictionary == null) {
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return;
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}
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runGCIfRequiredLocked(true /* mindsBlockByGC */);
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if (!mBinaryDictionary.removeNgramEntry(prevWordsInfo, word)) {
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if (DEBUG) {
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Log.i(TAG, "Cannot remove n-gram entry.");
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Log.i(TAG, " PrevWordsInfo: " + prevWordsInfo + ", word: " + word);
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}
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}
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}
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});
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}
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public interface AddMultipleDictionaryEntriesCallback {
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public void onFinished();
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}
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/**
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* Dynamically add multiple entries to the dictionary.
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*/
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public void addMultipleDictionaryEntriesDynamically(
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final ArrayList<LanguageModelParam> languageModelParams,
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final AddMultipleDictionaryEntriesCallback callback) {
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reloadDictionaryIfRequired();
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asyncExecuteTaskWithWriteLock(new Runnable() {
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@Override
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public void run() {
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try {
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if (mBinaryDictionary == null) {
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return;
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}
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mBinaryDictionary.addMultipleDictionaryEntries(
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languageModelParams.toArray(
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new LanguageModelParam[languageModelParams.size()]));
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} finally {
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if (callback != null) {
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callback.onFinished();
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}
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}
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}
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});
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}
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@Override
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public ArrayList<SuggestedWordInfo> getSuggestions(final WordComposer composer,
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final PrevWordsInfo prevWordsInfo, final ProximityInfo proximityInfo,
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final SettingsValuesForSuggestion settingsValuesForSuggestion, final int sessionId,
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final float[] inOutLanguageWeight) {
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reloadDictionaryIfRequired();
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boolean lockAcquired = false;
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try {
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lockAcquired = mLock.readLock().tryLock(
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TIMEOUT_FOR_READ_OPS_IN_MILLISECONDS, TimeUnit.MILLISECONDS);
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if (lockAcquired) {
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if (mBinaryDictionary == null) {
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return null;
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}
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final ArrayList<SuggestedWordInfo> suggestions =
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mBinaryDictionary.getSuggestions(composer, prevWordsInfo, proximityInfo,
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settingsValuesForSuggestion, sessionId, inOutLanguageWeight);
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if (mBinaryDictionary.isCorrupted()) {
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Log.i(TAG, "Dictionary (" + mDictName +") is corrupted. "
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+ "Remove and regenerate it.");
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removeBinaryDictionary();
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}
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return suggestions;
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}
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} catch (final InterruptedException e) {
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Log.e(TAG, "Interrupted tryLock() in getSuggestionsWithSessionId().", e);
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} finally {
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if (lockAcquired) {
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mLock.readLock().unlock();
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}
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}
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return null;
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}
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@Override
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public boolean isInDictionary(final String word) {
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reloadDictionaryIfRequired();
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boolean lockAcquired = false;
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try {
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lockAcquired = mLock.readLock().tryLock(
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TIMEOUT_FOR_READ_OPS_IN_MILLISECONDS, TimeUnit.MILLISECONDS);
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if (lockAcquired) {
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if (mBinaryDictionary == null) {
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return false;
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}
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return isInDictionaryLocked(word);
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}
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} catch (final InterruptedException e) {
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Log.e(TAG, "Interrupted tryLock() in isInDictionary().", e);
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} finally {
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if (lockAcquired) {
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mLock.readLock().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 isInDictionaryLocked(final String word) {
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if (mBinaryDictionary == null) return false;
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return mBinaryDictionary.isInDictionary(word);
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}
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@Override
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public int getMaxFrequencyOfExactMatches(final String word) {
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reloadDictionaryIfRequired();
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boolean lockAcquired = false;
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try {
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lockAcquired = mLock.readLock().tryLock(
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TIMEOUT_FOR_READ_OPS_IN_MILLISECONDS, TimeUnit.MILLISECONDS);
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if (lockAcquired) {
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if (mBinaryDictionary == null) {
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return NOT_A_PROBABILITY;
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}
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return mBinaryDictionary.getMaxFrequencyOfExactMatches(word);
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}
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} catch (final InterruptedException e) {
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Log.e(TAG, "Interrupted tryLock() in getMaxFrequencyOfExactMatches().", e);
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} finally {
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if (lockAcquired) {
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mLock.readLock().unlock();
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}
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}
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return NOT_A_PROBABILITY;
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}
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protected boolean isValidNgramLocked(final PrevWordsInfo prevWordsInfo, final String word) {
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if (mBinaryDictionary == null) return false;
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return mBinaryDictionary.isValidNgram(prevWordsInfo, word);
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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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private void loadBinaryDictionaryLocked() {
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if (DBG_STRESS_TEST) {
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// Test if this class does not cause problems when it takes long time to load binary
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// dictionary.
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try {
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Log.w(TAG, "Start stress in loading: " + mDictName);
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Thread.sleep(15000);
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Log.w(TAG, "End stress in loading");
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} catch (InterruptedException e) {
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}
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}
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final BinaryDictionary oldBinaryDictionary = mBinaryDictionary;
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openBinaryDictionaryLocked();
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if (oldBinaryDictionary != null) {
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oldBinaryDictionary.close();
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}
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if (mBinaryDictionary.isValidDictionary()
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&& needsToMigrateDictionary(mBinaryDictionary.getFormatVersion())) {
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if (!mBinaryDictionary.migrateTo(DICTIONARY_FORMAT_VERSION)) {
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Log.e(TAG, "Dictionary migration failed: " + mDictName);
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removeBinaryDictionaryLocked();
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}
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}
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}
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/**
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* Create a new binary dictionary and load initial contents.
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*/
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private void createNewDictionaryLocked() {
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|
removeBinaryDictionaryLocked();
|
|
createOnMemoryBinaryDictionaryLocked();
|
|
loadInitialContentsLocked();
|
|
// Run GC and flush to file when initial contents have been loaded.
|
|
mBinaryDictionary.flushWithGCIfHasUpdated();
|
|
}
|
|
|
|
/**
|
|
* Marks that the dictionary needs to be recreated.
|
|
*
|
|
*/
|
|
protected void setNeedsToRecreate() {
|
|
mNeedsToRecreate = true;
|
|
}
|
|
|
|
/**
|
|
* Load the current binary dictionary from internal storage. If the dictionary file doesn't
|
|
* exists or needs to be regenerated, the new dictionary file will be asynchronously generated.
|
|
* However, the dictionary itself is accessible even before the new dictionary file is actually
|
|
* generated. It may return a null result for getSuggestions() in that case by design.
|
|
*/
|
|
public final void reloadDictionaryIfRequired() {
|
|
if (!isReloadRequired()) return;
|
|
asyncReloadDictionary();
|
|
}
|
|
|
|
/**
|
|
* Returns whether a dictionary reload is required.
|
|
*/
|
|
private boolean isReloadRequired() {
|
|
return mBinaryDictionary == null || mNeedsToRecreate;
|
|
}
|
|
|
|
/**
|
|
* Reloads the dictionary. Access is controlled on a per dictionary file basis.
|
|
*/
|
|
private final void asyncReloadDictionary() {
|
|
if (mIsReloading.compareAndSet(false, true)) {
|
|
asyncExecuteTaskWithWriteLock(new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
try {
|
|
if (!mDictFile.exists() || mNeedsToRecreate) {
|
|
// If the dictionary file does not exist or contents have been updated,
|
|
// generate a new one.
|
|
createNewDictionaryLocked();
|
|
} else if (mBinaryDictionary == null) {
|
|
// Otherwise, load the existing dictionary.
|
|
loadBinaryDictionaryLocked();
|
|
if (mBinaryDictionary != null && !(isValidDictionaryLocked()
|
|
// TODO: remove the check below
|
|
&& matchesExpectedBinaryDictFormatVersionForThisType(
|
|
mBinaryDictionary.getFormatVersion()))) {
|
|
// Binary dictionary or its format version is not valid. Regenerate
|
|
// the dictionary file. createNewDictionaryLocked will remove the
|
|
// existing files if appropriate.
|
|
createNewDictionaryLocked();
|
|
}
|
|
}
|
|
mNeedsToRecreate = false;
|
|
} finally {
|
|
mIsReloading.set(false);
|
|
}
|
|
}
|
|
});
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Flush binary dictionary to dictionary file.
|
|
*/
|
|
public void asyncFlushBinaryDictionary() {
|
|
asyncExecuteTaskWithWriteLock(new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
if (mBinaryDictionary == null) {
|
|
return;
|
|
}
|
|
if (mBinaryDictionary.needsToRunGC(false /* mindsBlockByGC */)) {
|
|
mBinaryDictionary.flushWithGC();
|
|
} else {
|
|
mBinaryDictionary.flush();
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
@UsedForTesting
|
|
public void waitAllTasksForTests() {
|
|
final CountDownLatch countDownLatch = new CountDownLatch(1);
|
|
ExecutorUtils.getExecutor(mDictName).execute(new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
countDownLatch.countDown();
|
|
}
|
|
});
|
|
try {
|
|
countDownLatch.await();
|
|
} catch (InterruptedException e) {
|
|
Log.e(TAG, "Interrupted while waiting for finishing dictionary operations.", e);
|
|
}
|
|
}
|
|
|
|
@UsedForTesting
|
|
public void clearAndFlushDictionaryWithAdditionalAttributes(
|
|
final Map<String, String> attributeMap) {
|
|
mAdditionalAttributeMap = attributeMap;
|
|
clear();
|
|
}
|
|
|
|
public void dumpAllWordsForDebug() {
|
|
reloadDictionaryIfRequired();
|
|
asyncExecuteTaskWithLock(mLock.readLock(), new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
Log.d(TAG, "Dump dictionary: " + mDictName);
|
|
try {
|
|
final DictionaryHeader header = mBinaryDictionary.getHeader();
|
|
Log.d(TAG, "Format version: " + mBinaryDictionary.getFormatVersion());
|
|
Log.d(TAG, CombinedFormatUtils.formatAttributeMap(
|
|
header.mDictionaryOptions.mAttributes));
|
|
} catch (final UnsupportedFormatException e) {
|
|
Log.d(TAG, "Cannot fetch header information.", e);
|
|
}
|
|
int token = 0;
|
|
do {
|
|
final BinaryDictionary.GetNextWordPropertyResult result =
|
|
mBinaryDictionary.getNextWordProperty(token);
|
|
final WordProperty wordProperty = result.mWordProperty;
|
|
if (wordProperty == null) {
|
|
Log.d(TAG, " dictionary is empty.");
|
|
break;
|
|
}
|
|
Log.d(TAG, wordProperty.toString());
|
|
token = result.mNextToken;
|
|
} while (token != 0);
|
|
}
|
|
});
|
|
}
|
|
}
|