aeron 0.2.0

/*
 * 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::correlated_message_flyweight::{CorrelatedMessageDefn, CorrelatedMessageFlyweight};
use crate::concurrent::atomic_buffer::AtomicBuffer;
use crate::utils::types::Index;

#[repr(C, packed(4))]
#[derive(Copy, Clone)]
struct DestinationMessageDefn {
    correlated_message: CorrelatedMessageDefn,
    registration_id: i64,
    channel_length: i32,
    channel_data: [i8; 1],
}

pub(crate) struct DestinationMessageFlyweight {
    correlated_message_flyweight: CorrelatedMessageFlyweight,
    m_struct: *mut DestinationMessageDefn, // This is actually part of above field memory space
}

impl DestinationMessageFlyweight {
    pub fn new(buffer: AtomicBuffer, offset: Index) -> Self {
        let correlated_message_flyweight = CorrelatedMessageFlyweight::new(buffer, offset);
        let m_struct = correlated_message_flyweight
            .flyweight
            .overlay_struct::<DestinationMessageDefn>(0);
        Self {
            correlated_message_flyweight,
            m_struct,
        }
    }

    #[inline]
    pub fn set_registration_id(&mut self, value: i64) {
        unsafe {
            (*self.m_struct).registration_id = value;
        }
    }

    #[inline]
    pub fn set_channel(&mut self, value: &[u8]) {
        self.correlated_message_flyweight
            .flyweight
            .string_put(offset_of!(DestinationMessageDefn, channel_length) as Index, value);
    }

    #[inline]
    pub fn length(&self) -> Index {
        unsafe { offset_of!(DestinationMessageDefn, channel_data) as Index + (*self.m_struct).channel_length as Index }
    }

    // Parent Setters

    #[inline]
    pub fn set_client_id(&mut self, value: i64) {
        self.correlated_message_flyweight.set_client_id(value);
    }

    #[inline]
    pub fn set_correlation_id(&mut self, value: i64) {
        self.correlated_message_flyweight.set_correlation_id(value);
    }
}