store.h

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/*
 * Copyright © 2013 Canonical Ltd.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Authored by: Thomas Voß <thomas.voss@canonical.com>
 */

#ifndef CORE_TRUST_STORE_H_
#define CORE_TRUST_STORE_H_

#include <core/trust/request.h>
#include <core/trust/tagged_integer.h>
#include <core/trust/visibility.h>

#include <functional>
#include <memory>
#include <stdexcept>

namespace core
{
namespace trust
{
class CORE_TRUST_DLL_PUBLIC Store
{
public:
    struct Errors
    {
        Errors() = delete;
        struct ErrorOpeningStore : public std::runtime_error
        {
            ErrorOpeningStore(const char* implementation_specific)
                : std::runtime_error(implementation_specific)
            {
            }
        };

        struct ErrorResettingStore : public std::runtime_error
        {
            ErrorResettingStore(const char* implementation_specific)
                : std::runtime_error(implementation_specific)
            {
            }
        };

    };

    class Query
    {
    public:
        struct Errors
        {
            Errors() = delete;
            struct QueryIsInErrorState : public std::runtime_error
            {
                QueryIsInErrorState() : std::runtime_error("Query is in error state, cannot extract result.")
                {
                }
            };

            struct NoCurrentResult : public std::runtime_error
            {
                NoCurrentResult() : std::runtime_error("Query does not have a current result.")
                {
                }
            };
        };

        enum class Status
        {
            armed, 
            has_more_results, 
            eor, 
            error 
        };

        Query(const Query&) = delete;
        virtual ~Query() = default;

        virtual Status status() const = 0;

        virtual void for_application_id(const std::string& id) = 0;

        virtual void for_feature(Feature feature) = 0;

        virtual void for_interval(const Request::Timestamp& begin, const Request::Timestamp& end) = 0;

        virtual void for_answer(Request::Answer answer) = 0;

        virtual void all() = 0;

        virtual void execute() = 0;

        virtual void next() = 0;

        virtual void erase() = 0;

        virtual Request current() = 0;

    protected:
        Query() = default;
    };

    Store(const Store&) = delete;
    virtual ~Store() = default;

    Store& operator=(const Store&) = delete;
    bool operator==(const Store&) const = delete;

    virtual void reset() = 0;

    virtual void add(const Request& request) = 0;

    virtual std::shared_ptr<Query> query() = 0;

protected:
    Store() = default;
};

struct Errors
{
    Errors() = delete;
    struct ServiceNameMustNotBeEmpty : public std::runtime_error
    {
        ServiceNameMustNotBeEmpty() : std::runtime_error("Service name must not be empty")
        {
        }
    };
};

CORE_TRUST_DLL_PUBLIC std::shared_ptr<Store> create_default_store(const std::string& service_name);
}
}

#endif // CORE_TRUST_STORE_H_