expression_cache.h

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// Copyright (C) 2022-2025 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
#ifndef EXPRESSION_CACHE_H
#define EXPRESSION_CACHE_H
 
#include <cc/base_stamped_element.h>
#include <cc/data.h>
#include <eval/evaluate.h>
#include <eval/token.h>
#include <dhcpsrv/subnet.h>
 
#include <boost/algorithm/string/split.hpp>
#include <boost/algorithm/string/classification.hpp>
 
#include <map>
#include <mutex>
#include <string>
 
namespace isc {
namespace ddns_tuning {

class ExpressionCache : public data::BaseStampedElement {
public:
    ExpressionCache() : expressions_() {
    }

    virtual ~ExpressionCache() {
    }

    bool findExpression(const dhcp::SubnetID& subnet_id,
                        dhcp::ExpressionPtr& expression);

    dhcp::ExpressionPtr parseAndCacheExpression(const dhcp::SubnetID& subnet_id,
                                        const std::string& expression_str,
                                        uint32_t family);

    void cacheExpression(const dhcp::SubnetID& subnet_id,
                         dhcp::ExpressionPtr& expression);

    void clear();

    size_t size();

    boost::posix_time::ptime getLastFlushTime();
 
private:
    bool findExpressionInternal(const dhcp::SubnetID& subnet_id, dhcp::ExpressionPtr& expression) const;

    std::map<dhcp::SubnetID, dhcp::ExpressionPtr> expressions_;

    std::mutex mutex_;
};
 
} // end of namespace ddns_tuning
} // end of namespace isc
#endif