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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.inputmethod.latin;
import java.util.HashSet;
import java.util.Locale;
import java.util.concurrent.TimeUnit;
import com.android.inputmethod.annotations.UsedForTesting;
import android.content.Context;
import android.util.Log;
import android.util.LruCache;
/**
* Cache for dictionary facilitators of multiple locales.
* This class automatically creates and releases facilitator instances using LRU policy.
*/
public class DictionaryFacilitatorLruCache {
static final String TAG = DictionaryFacilitatorLruCache.class.getSimpleName();
private static final int WAIT_FOR_LOADING_MAIN_DICT_IN_MILLISECONDS = 1000;
private static final int MAX_RETRY_COUNT_FOR_WAITING_FOR_LOADING_DICT = 5;
/**
* Class extends LruCache. This class tracks cached locales and closes evicted dictionaries by
* overriding entryRemoved.
*/
private static class DictionaryFacilitatorLruCacheInner extends
LruCache<Locale, DictionaryFacilitator> {
private final HashSet<Locale> mCachedLocales;
public DictionaryFacilitatorLruCacheInner(final HashSet<Locale> cachedLocales,
final int maxSize) {
super(maxSize);
mCachedLocales = cachedLocales;
}
@Override
protected void entryRemoved(boolean evicted, Locale key,
DictionaryFacilitator oldValue, DictionaryFacilitator newValue) {
if (oldValue != null && oldValue != newValue) {
oldValue.closeDictionaries();
}
if (key != null && newValue == null) {
// Remove locale from the cache when the dictionary facilitator for the locale is
// evicted and new facilitator is not set for the locale.
mCachedLocales.remove(key);
if (size() >= maxSize()) {
Log.w(TAG, "DictionaryFacilitator for " + key.toString()
+ " has been evicted due to cache size limit."
+ " size: " + size() + ", maxSize: " + maxSize());
}
}
}
}
private final Context mContext;
private final HashSet<Locale> mCachedLocales = new HashSet<>();
private final String mDictionaryNamePrefix;
private final DictionaryFacilitatorLruCacheInner mLruCache;
private final Object mLock = new Object();
private boolean mUseContactsDictionary = false;
public DictionaryFacilitatorLruCache(final Context context, final int maxSize,
final String dictionaryNamePrefix) {
mContext = context;
mLruCache = new DictionaryFacilitatorLruCacheInner(mCachedLocales, maxSize);
mDictionaryNamePrefix = dictionaryNamePrefix;
}
private static void waitForLoadingMainDictionary(
final DictionaryFacilitator dictionaryFacilitator) {
for (int i = 0; i < MAX_RETRY_COUNT_FOR_WAITING_FOR_LOADING_DICT; i++) {
try {
dictionaryFacilitator.waitForLoadingMainDictionaries(
WAIT_FOR_LOADING_MAIN_DICT_IN_MILLISECONDS, TimeUnit.MILLISECONDS);
return;
} catch (final InterruptedException e) {
Log.i(TAG, "Interrupted during waiting for loading main dictionary.", e);
if (i < MAX_RETRY_COUNT_FOR_WAITING_FOR_LOADING_DICT - 1) {
Log.i(TAG, "Retry", e);
} else {
Log.w(TAG, "Give up retrying. Retried "
+ MAX_RETRY_COUNT_FOR_WAITING_FOR_LOADING_DICT + " times.", e);
}
}
}
}
private void resetDictionariesForLocaleLocked(final DictionaryFacilitator dictionaryFacilitator,
final Locale locale) {
dictionaryFacilitator.resetDictionariesWithDictNamePrefix(mContext, new Locale[] { locale },
mUseContactsDictionary, false /* usePersonalizedDicts */,
false /* forceReloadMainDictionary */, null /* listener */,
mDictionaryNamePrefix);
}
public void setUseContactsDictionary(final boolean useContectsDictionary) {
if (mUseContactsDictionary == useContectsDictionary) {
// The value has not been changed.
return;
}
synchronized (mLock) {
mUseContactsDictionary = useContectsDictionary;
for (final Locale locale : mCachedLocales) {
final DictionaryFacilitator dictionaryFacilitator = mLruCache.get(locale);
resetDictionariesForLocaleLocked(dictionaryFacilitator, locale);
waitForLoadingMainDictionary(dictionaryFacilitator);
}
}
}
public DictionaryFacilitator get(final Locale locale) {
DictionaryFacilitator dictionaryFacilitator = mLruCache.get(locale);
if (dictionaryFacilitator != null) {
// dictionary falicitator for the locale is in the cache.
return dictionaryFacilitator;
}
synchronized (mLock) {
dictionaryFacilitator = mLruCache.get(locale);
if (dictionaryFacilitator != null) {
return dictionaryFacilitator;
}
dictionaryFacilitator = new DictionaryFacilitator();
resetDictionariesForLocaleLocked(dictionaryFacilitator, locale);
waitForLoadingMainDictionary(dictionaryFacilitator);
mLruCache.put(locale, dictionaryFacilitator);
mCachedLocales.add(locale);
return dictionaryFacilitator;
}
}
public void evictAll() {
synchronized (mLock) {
mLruCache.evictAll();
mCachedLocales.clear();
}
}
@UsedForTesting
HashSet<Locale> getCachedLocalesForTesting() {
return mCachedLocales;
}
}
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