Вы не можете выбрать более 25 тем
Темы должны начинаться с буквы или цифры, могут содержать дефисы(-) и должны содержать не более 35 символов.
85 строки
3.2 KiB
85 строки
3.2 KiB
#pragma once
|
|
|
|
#include "gp/containers/vector.hpp"
|
|
#include "gp/functional/optional.hpp"
|
|
#include "gp/ipc/bottleneck.hpp"
|
|
#include "gp/utils/allocators/allocator.hpp"
|
|
#include "gp/utils/allocators/buddy.hpp"
|
|
#include "gp/utils/pointers.hpp"
|
|
|
|
namespace gp {
|
|
/**
|
|
* @brief
|
|
*/
|
|
class channel {
|
|
allocator& self_allocator; //< This is from whatever created the channel and MUST outlive the channel
|
|
gp::unique_ptr<allocator> local_allocator_impl; //< The allocator used here
|
|
gp::vector<gp::vector<char>> data;
|
|
gp::fast_bottleneck lock;
|
|
|
|
public:
|
|
/**
|
|
* @brief Construct a new channel object
|
|
*
|
|
* @param memory_source Where do we allocate from for this channel
|
|
* @param memory_available The amount of memory to allocate, default specified in the configuration
|
|
*/
|
|
channel(allocator& memory_source, size_t memory_available = gp_config::limits::channel_default_size)
|
|
: self_allocator(memory_source)
|
|
, local_allocator_impl(
|
|
gp::unique_ptr<gp::buddy<gp_config::limits::channel_max_size/16,16>>
|
|
::make(self_allocator, memory_available, self_allocator)
|
|
.cast<allocator>()
|
|
)
|
|
, data(*local_allocator_impl)
|
|
{}
|
|
|
|
/**
|
|
* @brief Sends a message on the channel
|
|
*
|
|
* @param message The message to transmit through the channel, this implies two copies. Empty messages are invalid and hence not transmitted.
|
|
* @return true if the message was successfully sent
|
|
* @return false if the message was not sent
|
|
*/
|
|
bool try_send(const gp::buffer<char> message) {
|
|
if(message.size() == 0) return false;
|
|
auto guard = lock_guard(lock);
|
|
auto v = gp::vector<char>(*local_allocator_impl);
|
|
if(not v.reserve(message.size())) return false;
|
|
for(char c : message) {
|
|
v.push_back(c);
|
|
}
|
|
if(not data.push_back(v)) return false;
|
|
if((*data.rbegin()).size() == 0) return false;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @brief Tries to receive a message that matches a certain predicate
|
|
*
|
|
* @tparam predicate represents the predicate type, you will probably never specify that by hand
|
|
* @param allocate The allocator to allocate the response from
|
|
* @param pred The predicate
|
|
* @return gp::optional<gp::vector<char>> if the receive failed, this will be empty, else it will contain the message
|
|
*/
|
|
template<typename predicate>
|
|
gp::optional<gp::vector<char>> try_receive(
|
|
allocator allocate,
|
|
predicate pred = [](gp::buffer<char>){return true;}
|
|
) {
|
|
for(auto it = data.begin(); it != data.end(); ++it) {
|
|
auto& elem = *it;
|
|
if(predicate(elem.as_buffer())) {
|
|
auto v = gp::vector<char>(allocate);
|
|
if(not v.reserve(elem.size())) return nullopt;
|
|
for(char c : elem) {
|
|
v.push_back(c);
|
|
}
|
|
data.remove(it);
|
|
return gp::move(v);
|
|
}
|
|
}
|
|
return nullopt;
|
|
}
|
|
};
|
|
}
|