157 lines
6.3 KiB
Java
157 lines
6.3 KiB
Java
/*
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* Copyright (C) 2014 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 java.util.HashSet;
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import java.util.Locale;
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import java.util.concurrent.TimeUnit;
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import com.android.inputmethod.annotations.UsedForTesting;
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import android.content.Context;
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import android.util.Log;
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import android.util.LruCache;
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/**
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* Cache for dictionary facilitators of multiple locales.
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* This class automatically creates and releases facilitator instances using LRU policy.
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*/
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public class DictionaryFacilitatorLruCache {
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private static final String TAG = DictionaryFacilitatorLruCache.class.getSimpleName();
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private static final int WAIT_FOR_LOADING_MAIN_DICT_IN_MILLISECONDS = 1000;
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private static final int MAX_RETRY_COUNT_FOR_WAITING_FOR_LOADING_DICT = 5;
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/**
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* Class extends LruCache. This class tracks cached locales and closes evicted dictionaries by
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* overriding entryRemoved.
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*/
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private static class DictionaryFacilitatorLruCacheInner extends
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LruCache<Locale, DictionaryFacilitator> {
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private final HashSet<Locale> mCachedLocales;
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public DictionaryFacilitatorLruCacheInner(final HashSet<Locale> cachedLocales,
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final int maxSize) {
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super(maxSize);
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mCachedLocales = cachedLocales;
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}
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@Override
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protected void entryRemoved(boolean evicted, Locale key,
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DictionaryFacilitator oldValue, DictionaryFacilitator newValue) {
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if (oldValue != null && oldValue != newValue) {
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oldValue.closeDictionaries();
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}
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if (key != null && newValue == null) {
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// Remove locale from the cache when the dictionary facilitator for the locale is
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// evicted and new facilitator is not set for the locale.
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mCachedLocales.remove(key);
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if (size() >= maxSize()) {
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Log.w(TAG, "DictionaryFacilitator for " + key.toString()
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+ " has been evicted due to cache size limit."
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+ " size: " + size() + ", maxSize: " + maxSize());
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}
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}
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}
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}
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private final Context mContext;
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private final HashSet<Locale> mCachedLocales = new HashSet<>();
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private final String mDictionaryNamePrefix;
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private final DictionaryFacilitatorLruCacheInner mLruCache;
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private final Object mLock = new Object();
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private boolean mUseContactsDictionary = false;
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public DictionaryFacilitatorLruCache(final Context context, final int maxSize,
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final String dictionaryNamePrefix) {
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mContext = context;
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mLruCache = new DictionaryFacilitatorLruCacheInner(mCachedLocales, maxSize);
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mDictionaryNamePrefix = dictionaryNamePrefix;
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}
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private void waitForLoadingMainDictionary(final DictionaryFacilitator dictionaryFacilitator) {
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for (int i = 0; i < MAX_RETRY_COUNT_FOR_WAITING_FOR_LOADING_DICT; i++) {
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try {
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dictionaryFacilitator.waitForLoadingMainDictionary(
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WAIT_FOR_LOADING_MAIN_DICT_IN_MILLISECONDS, TimeUnit.MILLISECONDS);
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return;
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} catch (final InterruptedException e) {
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Log.i(TAG, "Interrupted during waiting for loading main dictionary.", e);
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if (i < MAX_RETRY_COUNT_FOR_WAITING_FOR_LOADING_DICT - 1) {
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Log.i(TAG, "Retry", e);
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} else {
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Log.w(TAG, "Give up retrying. Retried "
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+ MAX_RETRY_COUNT_FOR_WAITING_FOR_LOADING_DICT + " times.", e);
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}
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}
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}
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}
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private void resetDictionariesForLocaleLocked(final DictionaryFacilitator dictionaryFacilitator,
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final Locale locale) {
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dictionaryFacilitator.resetDictionariesWithDictNamePrefix(mContext, locale,
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mUseContactsDictionary, false /* usePersonalizedDicts */,
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false /* forceReloadMainDictionary */, null /* listener */,
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mDictionaryNamePrefix);
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}
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public void setUseContactsDictionary(final boolean useContectsDictionary) {
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if (mUseContactsDictionary == useContectsDictionary) {
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// The value has not been changed.
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return;
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}
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synchronized (mLock) {
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mUseContactsDictionary = useContectsDictionary;
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for (final Locale locale : mCachedLocales) {
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final DictionaryFacilitator dictionaryFacilitator = mLruCache.get(locale);
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resetDictionariesForLocaleLocked(dictionaryFacilitator, locale);
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waitForLoadingMainDictionary(dictionaryFacilitator);
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}
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}
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}
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public DictionaryFacilitator get(final Locale locale) {
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DictionaryFacilitator dictionaryFacilitator = mLruCache.get(locale);
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if (dictionaryFacilitator != null) {
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// dictionary falicitator for the locale is in the cache.
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return dictionaryFacilitator;
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}
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synchronized (mLock) {
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dictionaryFacilitator = mLruCache.get(locale);
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if (dictionaryFacilitator != null) {
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return dictionaryFacilitator;
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}
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dictionaryFacilitator = new DictionaryFacilitator();
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resetDictionariesForLocaleLocked(dictionaryFacilitator, locale);
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waitForLoadingMainDictionary(dictionaryFacilitator);
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mLruCache.put(locale, dictionaryFacilitator);
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mCachedLocales.add(locale);
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return dictionaryFacilitator;
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}
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}
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public void evictAll() {
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synchronized (mLock) {
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mLruCache.evictAll();
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mCachedLocales.clear();
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}
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}
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@UsedForTesting
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HashSet<Locale> getCachedLocalesForTesting() {
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return mCachedLocales;
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}
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}
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