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/*
* Copyright 2017 Google
*
* 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.
*/
#import <Foundation/Foundation.h>
#include <memory>
#import "Firestore/Source/Local/FSTQueryCache.h"
#include "Firestore/core/src/firebase/firestore/local/leveldb_transaction.h"
#include "leveldb/db.h"
@class FSTLevelDB;
@class FSTLocalSerializer;
@class FSTPBTargetGlobal;
@protocol FSTGarbageCollector;
NS_ASSUME_NONNULL_BEGIN
/** Cached Queries backed by LevelDB. */
@interface FSTLevelDBQueryCache : NSObject <FSTQueryCache>
/**
* Retrieves the global singleton metadata row from the given database, if it exists.
* TODO(gsoltis): remove this method once fully ported to transactions.
*/
+ (nullable FSTPBTargetGlobal *)readTargetMetadataFromDB:(leveldb::DB *)db;
/**
* Retrieves the global singleton metadata row using the given transaction, if it exists.
*/
+ (nullable FSTPBTargetGlobal *)readTargetMetadataWithTransaction:
(firebase::firestore::local::LevelDbTransaction *)transaction;
- (instancetype)init NS_UNAVAILABLE;
/** The garbage collector to notify about potential garbage keys. */
@property(nonatomic, weak, readwrite, nullable) id<FSTGarbageCollector> garbageCollector;
/**
* Creates a new query cache in the given LevelDB.
*
* @param db The LevelDB in which to create the cache.
*/
- (instancetype)initWithDB:(FSTLevelDB *)db
serializer:(FSTLocalSerializer *)serializer NS_DESIGNATED_INITIALIZER;
@end
NS_ASSUME_NONNULL_END
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