230 lines
9.4 KiB
C++
230 lines
9.4 KiB
C++
/******************************************************************************
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The MIT License(MIT)
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Embedded Template Library.
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https://github.com/ETLCPP/etl
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https://www.etlcpp.com
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Copyright(c) 2021 John Wellbelove
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files(the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions :
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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******************************************************************************/
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#ifndef ETL_REFERENCE_COUNTED_MESSAGE_INCLUDED
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#define ETL_REFERENCE_COUNTED_MESSAGE_INCLUDED
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#include "platform.h"
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#include "message.h"
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#include "atomic.h"
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#include "reference_counted_object.h"
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#include "static_assert.h"
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#include "type_traits.h"
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#include "ireference_counted_message_pool.h"
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#include <stdint.h>
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namespace etl
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{
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//***************************************************************************
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// Base class for all reference counted messages.
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//***************************************************************************
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class ireference_counted_message
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{
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public:
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virtual ~ireference_counted_message() {}
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ETL_NODISCARD virtual etl::imessage& get_message() = 0; ///< Get a reference to the message.
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ETL_NODISCARD virtual const etl::imessage& get_message() const = 0; ///< Get a const reference to the message.
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ETL_NODISCARD virtual etl::ireference_counter& get_reference_counter() = 0; ///< Get a reference to the reference counter.
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ETL_NODISCARD virtual const etl::ireference_counter& get_reference_counter() const = 0; ///< Get a const reference to the reference counter.
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virtual void release() = 0; ///< Release back to the owner.
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};
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//***************************************************************************
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// Reference counted message with a counter and owner.
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//***************************************************************************
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template <typename TMessage, typename TCounter>
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class reference_counted_message : public etl::ireference_counted_message
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{
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public:
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ETL_STATIC_ASSERT((etl::is_base_of<etl::imessage, TMessage>::value), "Not a message type");
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typedef TMessage message_type;
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typedef TCounter counter_type;
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#if ETL_USING_CPP11
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//***************************************************************************
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/// Constructor
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/// \param owner The message owner.
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/// \param args The constructor arguments.
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//***************************************************************************
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template <typename... TArgs>
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reference_counted_message(etl::ireference_counted_message_pool& owner_, TArgs&&... args)
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: rc_object(etl::forward<TArgs>(args)...)
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, owner(owner_)
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{
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}
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#endif
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//***************************************************************************
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/// Constructor
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/// \param msg The message to count.
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/// \param owner The message owner.
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//***************************************************************************
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reference_counted_message(const TMessage& msg_, etl::ireference_counted_message_pool& owner_)
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: rc_object(msg_)
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, owner(owner_)
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{
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}
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//***************************************************************************
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/// Get a reference to the message.
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/// \return A reference to the message.
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//***************************************************************************
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ETL_NODISCARD virtual TMessage& get_message() ETL_OVERRIDE
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{
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return rc_object.get_object();
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}
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//***************************************************************************
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/// Get a const reference to the message.
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/// \return A const reference to the message.
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//***************************************************************************
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ETL_NODISCARD virtual const TMessage& get_message() const ETL_OVERRIDE
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{
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return rc_object.get_object();
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}
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//***************************************************************************
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/// Get a reference to the reference counter.
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/// \return A reference to the reference counter.
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//***************************************************************************
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ETL_NODISCARD virtual etl::ireference_counter& get_reference_counter() ETL_OVERRIDE
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{
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return rc_object.get_reference_counter();
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}
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//***************************************************************************
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/// Get a const reference to the reference counter.
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/// \return A const reference to the reference counter.
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//***************************************************************************
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ETL_NODISCARD virtual const etl::ireference_counter& get_reference_counter() const ETL_OVERRIDE
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{
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return rc_object.get_reference_counter();
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}
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//***************************************************************************
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/// Release back to the owner pool.
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/// \return A reference to the owner pool.
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//***************************************************************************
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virtual void release() ETL_OVERRIDE
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{
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owner.release(*this);
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}
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private:
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etl::reference_counted_object<TMessage, TCounter> rc_object; ///< The reference counted object.
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etl::ireference_counted_message_pool& owner; ///< The pool that owns this object.
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};
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//***************************************************************************
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// A persistent message with no counter and owner.
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//***************************************************************************
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template <typename TMessage>
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class persistent_message : public etl::ireference_counted_message
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{
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public:
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ETL_STATIC_ASSERT((etl::is_base_of<etl::imessage, TMessage>::value), "Not a message type");
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typedef TMessage message_type;
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typedef void counter_type;
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//***************************************************************************
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/// Constructor
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/// \param msg The message to count.
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//***************************************************************************
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explicit persistent_message(const TMessage& msg_)
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: rc_object(msg_)
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{
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}
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//***************************************************************************
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/// Get a reference to the message.
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/// \return A reference to the message.
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//***************************************************************************
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ETL_NODISCARD virtual TMessage& get_message() ETL_OVERRIDE
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{
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return rc_object.get_object();
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}
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//***************************************************************************
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/// Get a const reference to the message.
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/// \return A const reference to the message.
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//***************************************************************************
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ETL_NODISCARD virtual const TMessage& get_message() const ETL_OVERRIDE
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{
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return rc_object.get_object();
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}
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//***************************************************************************
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/// Get a reference to the reference counter.
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/// \return A reference to the reference counter.
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//***************************************************************************
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ETL_NODISCARD virtual etl::ireference_counter& get_reference_counter() ETL_OVERRIDE
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{
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return rc_object.get_reference_counter();
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}
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//***************************************************************************
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/// Get a const reference to the reference counter.
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/// \return A const reference to the reference counter.
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//***************************************************************************
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ETL_NODISCARD virtual const etl::ireference_counter& get_reference_counter() const ETL_OVERRIDE
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{
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return rc_object.get_reference_counter();
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}
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//***************************************************************************
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/// Does nothing for a persistent message
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/// \return A reference to the owner pool.
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//***************************************************************************
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virtual void release() ETL_OVERRIDE
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{
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// Do nothing.
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}
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private:
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etl::reference_counted_object<TMessage, void> rc_object; ///< The reference counted object.
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};
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#if ETL_USING_CPP11 && ETL_HAS_ATOMIC
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//***************************************************************************
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/// Class for creating reference counted objects using an atomic counter.
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/// \tparam TObject The type to be reference counted.
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//***************************************************************************
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template <typename TMessage>
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using atomic_counted_message = etl::reference_counted_message<TMessage, etl::atomic_int32_t>;
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#endif
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}
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#endif |