server_selector.h

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// Copyright (C) 2018 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 SERVER_SELECTOR_H
#define SERVER_SELECTOR_H

#include <set>
#include <string>

namespace isc {
namespace db {

class ServerSelector {
public:

    enum class Type {
        UNASSIGNED,
        ALL,
        SUBSET
    };

    static ServerSelector& UNASSIGNED() {
        static ServerSelector selector(Type::UNASSIGNED);
        return (selector);
    }

    static ServerSelector& ALL() {
        static ServerSelector selector(Type::ALL);
        return (selector);
    }

    static ServerSelector& ONE(const std::string& server_tag) {
        static ServerSelector selector(server_tag);
        return (selector);
    }

    static ServerSelector& MULTIPLE(const std::set<std::string>& server_tags) {
        static ServerSelector selector(server_tags);
        return (selector);
    }

    Type getType() const {
        return (type_);
    }

    std::set<std::string> getTags() const {
        return (tags_);
    }

    bool amUnassigned() const {
        return (getType() == Type::UNASSIGNED);
    }

private:

    explicit ServerSelector(const Type& type)
        : type_(type), tags_() {
    }

    explicit ServerSelector(const std::string& server_tag)
        : type_(Type::SUBSET), tags_() {
        tags_.insert(server_tag);
    }

    explicit ServerSelector(const std::set<std::string>& server_tags)
        : type_(Type::SUBSET), tags_(server_tags) {
    }

    Type type_;

    std::set<std::string> tags_;
};


} // end of namespace isc::db
} // end of namespace isc

#endif