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refactor(core): split queuing ports logic into multiple module
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Original file line number | Diff line number | Diff line change |
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use std::fmt::Debug; | ||
use std::mem::size_of; | ||
use std::time::Instant; | ||
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use crate::queuing::message::Message; | ||
use crate::queuing::queue::ConcurrentQueue; | ||
use crate::queuing::StripFieldExt; | ||
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#[derive(Debug)] | ||
pub struct SourceDatagram<'a> { | ||
pub num_messages_in_destination: &'a mut usize, | ||
pub has_overflowed: &'a mut bool, | ||
pub message_queue: &'a ConcurrentQueue, | ||
} | ||
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#[derive(Debug)] | ||
pub struct DestinationDatagram<'a> { | ||
pub num_messages_in_source: &'a mut usize, | ||
pub clear_requested_timestamp: &'a mut Option<Instant>, | ||
pub has_overflowed: &'a mut bool, | ||
pub message_queue: &'a ConcurrentQueue, | ||
} | ||
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impl<'a> SourceDatagram<'a> { | ||
pub fn size(msg_size: usize, msg_capacity: usize) -> usize { | ||
size_of::<usize>() // number of messages in destination | ||
+ size_of::<bool>() // flag if queue has overflowed | ||
+ ConcurrentQueue::size(Message::size(msg_size), msg_capacity) // the message queue | ||
} | ||
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pub fn init_at(msg_size: usize, msg_capacity: usize, buffer: &'a mut [u8]) -> Self { | ||
let (num_messages_in_destination, buffer) = unsafe { buffer.strip_field_mut::<usize>() }; | ||
let (has_overflowed, buffer) = unsafe { buffer.strip_field_mut::<bool>() }; | ||
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let message_queue = ConcurrentQueue::init_at(buffer, Message::size(msg_size), msg_capacity); | ||
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Self { | ||
num_messages_in_destination, | ||
has_overflowed, | ||
message_queue, | ||
} | ||
} | ||
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pub unsafe fn load_from(buffer: &'a mut [u8]) -> Self { | ||
let (num_messages_in_destination, buffer) = unsafe { buffer.strip_field_mut::<usize>() }; | ||
let (has_overflowed, buffer) = unsafe { buffer.strip_field_mut::<bool>() }; | ||
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let message_queue = ConcurrentQueue::load_from(buffer); | ||
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Self { | ||
num_messages_in_destination, | ||
has_overflowed, | ||
message_queue, | ||
} | ||
} | ||
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pub fn pop_then<F: FnOnce(Message<'_>) -> T, T>(&'_ mut self, f: F) -> Option<T> { | ||
self.message_queue | ||
.pop_then(|entry| f(Message::from_bytes(entry))) | ||
} | ||
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pub fn push<'b>( | ||
&'b mut self, | ||
data: &'_ [u8], | ||
message_timestamp: Instant, | ||
) -> Option<Message<'b>> { | ||
// We need to check if there is enough space left in the queue. | ||
// This is important, because we could theoretically store twice the number of | ||
// our queue size, because we use a separate source and destination queueu. | ||
// Thus we need to limit the number of messages in both queues at the same time. | ||
let queue_is_full = *self.num_messages_in_destination + self.message_queue.len() | ||
== self.message_queue.msg_capacity; | ||
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if queue_is_full { | ||
*self.has_overflowed = true; | ||
return None; | ||
} | ||
let entry = self.message_queue | ||
.push_then(|entry| Message::init_at(entry, data, message_timestamp)).expect("push to be successful because we just checked if there is space in both the source and destination"); | ||
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Some(Message::from_bytes(entry)) | ||
} | ||
} | ||
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impl<'a> DestinationDatagram<'a> { | ||
pub fn size(msg_size: usize, msg_capacity: usize) -> usize { | ||
size_of::<usize>() // number of messages in source | ||
+ size_of::<bool>() // flag if queue is overflowed | ||
+ size_of::<Option<Instant>>() // flag for the timestamp when a clear was requested | ||
+ ConcurrentQueue::size(Message::size(msg_size), msg_capacity) // the message queue | ||
} | ||
pub fn init_at(msg_size: usize, msg_capacity: usize, buffer: &'a mut [u8]) -> Self { | ||
let (num_messages_in_source, buffer) = unsafe { buffer.strip_field_mut::<usize>() }; | ||
let (clear_requested_timestamp, buffer) = | ||
unsafe { buffer.strip_field_mut::<Option<Instant>>() }; | ||
let (has_overflowed, buffer) = unsafe { buffer.strip_field_mut::<bool>() }; | ||
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*num_messages_in_source = 0; | ||
unsafe { | ||
std::ptr::write(clear_requested_timestamp, None); | ||
std::ptr::write(has_overflowed, false); | ||
} | ||
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Self { | ||
num_messages_in_source, | ||
clear_requested_timestamp, | ||
has_overflowed, | ||
message_queue: ConcurrentQueue::init_at(buffer, Message::size(msg_size), msg_capacity), | ||
} | ||
} | ||
pub unsafe fn load_from(buffer: &'a mut [u8]) -> Self { | ||
let (num_messages_in_source, buffer) = unsafe { buffer.strip_field_mut::<usize>() }; | ||
let (clear_requested_timestamp, buffer) = | ||
unsafe { buffer.strip_field_mut::<Option<Instant>>() }; | ||
let (has_overflown, buffer) = unsafe { buffer.strip_field_mut::<bool>() }; | ||
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Self { | ||
num_messages_in_source, | ||
clear_requested_timestamp, | ||
has_overflowed: has_overflown, | ||
message_queue: ConcurrentQueue::load_from(buffer), | ||
} | ||
} | ||
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/// Takes a closure that maps the popped message to some type. | ||
/// If there is a message in the queue, the resulting type and a flag | ||
/// whether the queue has overflowed is returned. | ||
pub fn pop_then<F: FnOnce(Message<'_>) -> T, T>(&mut self, msg_mapper: F) -> Option<(T, bool)> { | ||
self.message_queue | ||
.pop_then(|entry| msg_mapper(Message::from_bytes(entry))) | ||
.map(|t| (t, *self.has_overflowed)) | ||
} | ||
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/// Pushes a data onto the destination queue | ||
pub fn push<'b>(&'b mut self, data: &'_ [u8]) -> Option<Message<'b>> { | ||
let entry = self.message_queue.push(data)?; | ||
let msg = Message::from_bytes(entry); | ||
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Some(msg) | ||
} | ||
} |
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