aeron 0.2.0

Aeron client library - fast messaging over UDP on Rust
Documentation 
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/*
 * Copyright 2020 UT OVERSEAS INC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
use crate::command::flyweight::Flyweight;
use crate::concurrent::atomic_buffer::AtomicBuffer;
use crate::utils::types::Index;

/**
 * Control message flyweight for any message that needs to represent an image
 *
 * <p>
 * 0                   1                   2                   3
 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * |                        Correlation ID                         |
 * |                                                               |
 * +---------------------------------------------------------------+
 * |                 Subscription Registration ID                  |
 * |                                                               |
 * +---------------------------------------------------------------+
 * |                          Stream ID                            |
 * +---------------------------------------------------------------+
 * |                        Channel Length                         |
 * +---------------------------------------------------------------+
 * |                           Channel                           ...
 * ...                                                             |
 * +---------------------------------------------------------------+
 */

#[repr(C, packed(4))]
#[derive(Copy, Clone)]
pub(crate) struct ImageMessageDefn {
    correlation_id: i64,
    subscription_registration_id: i64,
    stream_id: i32,
    channel_length: i32,
    channel_data: [i8; 1],
}

pub(crate) struct ImageMessageFlyweight {
    flyweight: Flyweight<ImageMessageDefn>,
}

impl ImageMessageFlyweight {
    pub fn new(buffer: AtomicBuffer, offset: Index) -> Self {
        Self {
            flyweight: Flyweight::new(buffer, offset),
        }
    }

    // Getters

    #[inline]
    pub fn correlation_id(&self) -> i64 {
        unsafe { (*self.flyweight.m_struct).correlation_id }
    }

    #[inline]
    pub fn subscription_registration_id(&self) -> i64 {
        unsafe { (*self.flyweight.m_struct).subscription_registration_id }
    }
}