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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.Locale;
import java.util.concurrent.TimeUnit;
import android.content.Context;
import android.util.Log;
/**
* Cache for dictionary facilitators of multiple locales.
* This class automatically creates and releases up to 3 facilitator instances using LRU policy.
*/
public class DictionaryFacilitatorLruCache {
private static final String TAG = "DictionaryFacilitatorLruCache";
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;
private final Context mContext;
private final String mDictionaryNamePrefix;
private final Object mLock = new Object();
private final DictionaryFacilitator mDictionaryFacilitator;
private boolean mUseContactsDictionary;
private Locale mLocale;
public DictionaryFacilitatorLruCache(final Context context, final String dictionaryNamePrefix) {
mContext = context;
mDictionaryNamePrefix = dictionaryNamePrefix;
mDictionaryFacilitator = DictionaryFacilitatorProvider.getDictionaryFacilitator(
true /* isNeededForSpellChecking */);
}
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() {
// Nothing to do if the locale is null. This would be the case before any get() calls.
if (mLocale != null) {
// Note: Given that personalized dictionaries are not used here; we can pass null account.
mDictionaryFacilitator.resetDictionaries(mContext, new Locale[]{mLocale},
mUseContactsDictionary, false /* usePersonalizedDicts */,
false /* forceReloadMainDictionary */, null /* account */,
mDictionaryNamePrefix, null /* listener */);
}
}
public void setUseContactsDictionary(final boolean useContactsDictionary) {
synchronized (mLock) {
if (mUseContactsDictionary == useContactsDictionary) {
// The value has not been changed.
return;
}
mUseContactsDictionary = useContactsDictionary;
resetDictionariesForLocaleLocked();
waitForLoadingMainDictionary(mDictionaryFacilitator);
}
}
public DictionaryFacilitator get(final Locale locale) {
synchronized (mLock) {
if (!mDictionaryFacilitator.isForLocales(new Locale[]{locale})) {
mLocale = locale;
resetDictionariesForLocaleLocked();
}
waitForLoadingMainDictionary(mDictionaryFacilitator);
return mDictionaryFacilitator;
}
}
public void closeDictionaries() {
synchronized (mLock) {
mDictionaryFacilitator.closeDictionaries();
}
}
}
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