PersistentCache.h

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/*
 * Copyright 2017-present Facebook, Inc.
 *
 * 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.
 */
#pragma once

#include <folly/Optional.h>
#include <string>

namespace wangle {

template <typename K, typename V>
class PersistentCache {
  public:
    virtual ~PersistentCache() {}

    virtual folly::Optional<V> get(const K& key) = 0;

    virtual void put(const K& key, const V& val) = 0;

    virtual bool remove(const K& key) = 0;

    virtual void clear(bool clearPersistence = false) = 0;

    virtual size_t size() = 0;
};

}