aerospike-core 2.1.0

Aerospike Client for Rust
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// Copyright 2015-2018 Aerospike, 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
//
// 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 std::fmt;
use std::io::Cursor;

use byteorder::{LittleEndian, ReadBytesExt};

use crate::cluster::node;
use crate::Key;

/// Validates a Database server node
#[derive(Debug, Clone)]
pub struct Partition<'a> {
    pub namespace: &'a str,
    pub partition_id: usize,
}

impl<'a> Partition<'a> {
    pub const fn new(namespace: &'a str, partition_id: usize) -> Self {
        Partition {
            namespace,
            partition_id,
        }
    }

    pub fn new_by_key(key: &'a Key) -> Self {
        let mut rdr = Cursor::new(&key.digest[0..2]);

        Partition {
            namespace: &key.namespace,

            // CAN'T USE MOD directly - mod will give negative numbers.
            // First AND makes positive and negative correctly, then mod.
            // For any x, y : x % 2^y = x & (2^y - 1); the second method is twice as fast
            partition_id: rdr.read_u16::<LittleEndian>().unwrap() as usize & (node::PARTITIONS - 1),
        }
    }
}

impl PartialEq for Partition<'_> {
    fn eq(&self, other: &Partition) -> bool {
        self.namespace == other.namespace && self.partition_id == other.partition_id
    }
}

impl fmt::Display for Partition<'_> {
    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        format!("Partition ({}: {})", self.namespace, self.partition_id).fmt(f)
    }
}