rocketmq-protocol 1.0.0

Runtime-neutral RocketMQ wire protocol contracts
Documentation 
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// Copyright 2023 The RocketMQ Rust Authors
//
// 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
//
//     http://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 serde::Deserialize;
use serde::Serialize;

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
#[serde(rename_all = "camelCase")]
pub struct OffsetWrapper {
    broker_offset: i64,
    consumer_offset: i64,
    pull_offset: i64,
    last_timestamp: i64,
}

impl OffsetWrapper {
    pub fn new() -> Self {
        Self {
            broker_offset: 0,
            consumer_offset: 0,
            pull_offset: 0,
            last_timestamp: 0,
        }
    }

    pub fn get_broker_offset(&self) -> i64 {
        self.broker_offset
    }

    pub fn set_broker_offset(&mut self, broker_offset: i64) {
        self.broker_offset = broker_offset;
    }

    pub fn get_consumer_offset(&self) -> i64 {
        self.consumer_offset
    }

    pub fn set_consumer_offset(&mut self, consumer_offset: i64) {
        self.consumer_offset = consumer_offset;
    }

    pub fn get_pull_offset(&self) -> i64 {
        self.pull_offset
    }

    pub fn set_pull_offset(&mut self, pull_offset: i64) {
        self.pull_offset = pull_offset;
    }

    pub fn get_last_timestamp(&self) -> i64 {
        self.last_timestamp
    }

    pub fn set_last_timestamp(&mut self, last_timestamp: i64) {
        self.last_timestamp = last_timestamp;
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn methods_and_serde_preserve_offsets() {
        let mut wrapper = OffsetWrapper::new();
        assert_eq!(
            (
                wrapper.get_broker_offset(),
                wrapper.get_consumer_offset(),
                wrapper.get_pull_offset(),
                wrapper.get_last_timestamp(),
            ),
            (0, 0, 0, 0)
        );
        wrapper.set_broker_offset(-100);
        wrapper.set_consumer_offset(-200);
        wrapper.set_pull_offset(-300);
        wrapper.set_last_timestamp(-400);

        let serialized = serde_json::to_string(&wrapper).unwrap();
        let expected = r#"{"brokerOffset":-100,"consumerOffset":-200,"pullOffset":-300,"lastTimestamp":-400}"#;
        assert_eq!(serialized, expected);

        let deserialized: OffsetWrapper = serde_json::from_str(&serialized).unwrap();
        assert_eq!(
            (
                deserialized.get_broker_offset(),
                deserialized.get_consumer_offset(),
                deserialized.get_pull_offset(),
                deserialized.get_last_timestamp(),
            ),
            (-100, -200, -300, -400)
        );
    }
}