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Added shared_message example

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John Wellbelove 2021-01-15 09:45:51 +00:00
parent 7e340f5e71
commit a008ea3bfa
5 changed files with 450 additions and 0 deletions
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188
examples/SharedMessage/SharedMessage.cpp Normal file
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// SharedMessage.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include "etl/shared_message.h"
#include "etl/message.h"
#include "etl/reference_counted_message_pool.h"
#include "etl/message_router.h"
#include "etl/message_bus.h"
#include "etl/fixed_sized_memory_block_allocator.h"
#include "etl/queue.h"
#include <iostream>
#include <atomic>
#include <string>
constexpr etl::message_router_id_t RouterId1 = 1U;
constexpr etl::message_router_id_t RouterId2 = 2U;
//*****************************************************************************
struct Message1 : public etl::message<1>
{
Message1(std::string s_)
: s(s_)
{
}
std::string s;
};
//*****************************************************************************
struct Message2 : public etl::message<2>
{
Message2(std::string s_)
: s(s_)
{
}
std::string s;
};
//*****************************************************************************
void Print(const std::string& prefix, const etl::shared_message& sm)
{
std::cout << prefix << " : " << int(sm.get_message().get_message_id()) << "\n";
}
//*****************************************************************************
class MessageRouter1 : public etl::message_router<MessageRouter1, Message1, Message2>
{
public:
//****************************************
MessageRouter1()
: message_router(RouterId1)
{
}
//****************************************
void on_receive(etl::imessage_router& source, const Message1& msg)
{
std::cout << "on_receive Message1 : " << msg.s << "\n";
}
//****************************************
void on_receive(etl::imessage_router& source, const Message2& msg)
{
std::cout << "on_receive Message2 : " << msg.s << "\n";
}
//****************************************
void on_receive_unknown(etl::imessage_router& source, const etl::imessage& msg)
{
std::cout << "on_receive Unknown\n";
}
};
//*****************************************************************************
class MessageRouter2 : public etl::message_router<MessageRouter2, Message1, Message2>
{
public:
using base_t = etl::message_router<MessageRouter2, Message1, Message2>;
//****************************************
MessageRouter2()
: message_router(RouterId2)
{
}
using base_t::receive;
//****************************************
void receive(etl::imessage_router& source, etl::shared_message shared_msg) override
{
if (!queue.full())
{
Print("Queueing shared message", shared_msg);
queue.push(QueuedData{ &source, shared_msg });
}
}
//****************************************
void process_queue()
{
while (!queue.empty())
{
// Get the shared message from the queue.
QueuedData data = queue.front();
Print("Process queued shared messages", data.shared_msg);
// Send it to the base implementation for routing.
base_t::receive(*data.source, data.shared_msg);
queue.pop();
}
}
//****************************************
void on_receive(etl::imessage_router& source, const Message1& msg)
{
std::cout << "on_receive Message1 : " << msg.s << "\n";
}
//****************************************
void on_receive(etl::imessage_router& source, const Message2& msg)
{
std::cout << "on_receive Message2 : " << msg.s << "\n";
}
//****************************************
void on_receive_unknown(etl::imessage_router& source, const etl::imessage& msg)
{
std::cout << "on_receive Unknown\n";
}
private:
struct QueuedData
{
etl::imessage_router* source;
etl::shared_message shared_msg;
};
etl::queue<QueuedData, 10> queue;
};
//*****************************************************************************
struct Bus : public etl::message_bus<2U>
{
};
//*****************************************************************************
MessageRouter1 router1;
MessageRouter2 router2;
Bus bus;
//*****************************************************************************
// The memory block allocator that supplies the pool with memory
// to store reference counted messages in.
etl::fixed_sized_memory_block_allocator<100U, 4U, 4U> memory_pool;
//*****************************************************************************
// The pool that supplies reference counted messages.
// Uses memory_pool as its allocator.
etl::reference_counted_message_pool<std::atomic_int32_t> pool(memory_pool);
//*****************************************************************************
int main()
{
Message1 m1("One");
Message2 m2("Two");
etl::shared_message sm1(pool, m1);
etl::shared_message sm2(pool, m2);
bus.subscribe(router1);
bus.subscribe(router2);
bus.receive(sm1);
bus.receive(sm2);
router2.process_queue();
}

31
examples/SharedMessage/SharedMessage.sln Normal file
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