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