coordinode-lsm-tree 4.2.0

A K.I.S.S. implementation of log-structured merge trees (LSM-trees/LSMTs) — CoordiNode fork
Documentation 
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// Copyright (c) 2024-present, fjall-rs
// This source code is licensed under both the Apache 2.0 and MIT License
// (found in the LICENSE-* files in the repository)

mod full;
mod partitioned;

pub use full::FullIndexWriter;
pub use partitioned::PartitionedIndexWriter;

use crate::{
    CompressionType, checksum::ChecksummedWriter, encryption::EncryptionProvider,
    table::index_block::KeyedBlockHandle,
};
use std::sync::Arc;

pub trait BlockIndexWriter<W: std::io::Write + std::io::Seek> {
    /// Registers a data block in the block index.
    fn register_data_block(&mut self, block_handle: KeyedBlockHandle) -> crate::Result<()>;

    /// Writes the block index to a file.
    ///
    /// Returns the number of index blocks written.
    fn finish(
        self: Box<Self>,
        file_writer: &mut sfa::Writer<ChecksummedWriter<W>>,
    ) -> crate::Result<usize>;

    fn use_compression(
        self: Box<Self>,
        compression: CompressionType,
    ) -> Box<dyn BlockIndexWriter<W>>;

    // No default: `Box<Self> -> Box<dyn>` requires `Sized` which would break
    // object safety. Same constraint applies to all `use_*` builder methods.
    fn use_restart_interval(self: Box<Self>, interval: u8) -> Box<dyn BlockIndexWriter<W>>;

    fn use_partition_size(self: Box<Self>, size: u32) -> Box<dyn BlockIndexWriter<W>>;

    /// Sets the encryption provider for index blocks.
    fn use_encryption(
        self: Box<Self>,
        encryption: Option<Arc<dyn EncryptionProvider>>,
    ) -> Box<dyn BlockIndexWriter<W>>;
}