library_manager.h

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// Copyright (C) 2013-2020 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 LIBRARY_MANAGER_H
#define LIBRARY_MANAGER_H

#include <exceptions/exceptions.h>
#include <hooks/server_hooks.h>
#include <boost/shared_ptr.hpp>

#include <string>

namespace isc {
namespace hooks {

class NoCalloutManager : public Exception {
public:
    NoCalloutManager(const char* file, size_t line, const char* what) :
        isc::Exception(file, line, what) {}
};

class CalloutManager;
class LibraryHandle;
class LibraryManager;


class LibraryManager {
public:
    LibraryManager(const std::string& name, int index,
                   const boost::shared_ptr<CalloutManager>& manager);

    ~LibraryManager();

    static bool validateLibrary(const std::string& name);

    bool loadLibrary();

    bool prepareUnloadLibrary();

    std::string getName() const {
        return (library_name_);
    }

protected:
    // The following methods are protected as they are accessed in testing.

    bool unloadLibrary();

    bool openLibrary();

    bool closeLibrary();

    bool checkVersion() const;

    bool checkMultiThreadingCompatible() const;

    void registerStandardCallouts();

    bool runLoad();

private:
    LibraryManager(const std::string& name);

    // Member variables

    void*       dl_handle_;     
    int         index_;         
    boost::shared_ptr<CalloutManager> manager_;
    std::string library_name_;  

    ServerHooksPtr server_hooks_; 

};

} // namespace hooks
} // namespace isc

#endif  // LIBRARY_MANAGER_H