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Split Store into Store and Cursor

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This commit is contained in:
Yuriy Dupyn 2024-02-03 16:39:40 +01:00
parent dbd2ba9946
commit 3e7e8665fd
2 changed files with 252 additions and 203 deletions
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20
storage_engine/src/main.rs
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@ -23,11 +23,12 @@ async fn create_store() -> Result<Store<Data>> {
println!("THE STORE: {:?}", store);
println!("THE BYTES: {:?}", store.read_all_bytes().await?);
let mut cursor = store.cursor(AccessMode::Write).await.map_err(|e| e.to_io_or_panic())?;
let entry0: Entry<u32> = Entry::new_deleted(vec![1, 2, 3, 4, 5]);
append_entry(&mut store, &entry0).await?;
append_entry(&mut cursor, &entry0).await?;
let entry1: Entry<u32> = Entry::new_deleted(vec![200, 200, 5, 6, 7]);
append_entry(&mut store, &entry1).await?;
append_entry(&mut cursor, &entry1).await?;
println!("{:?}", store.read_all_bytes().await?);
Ok(store)
@ -51,17 +52,17 @@ async fn create_or_connect() -> Result<Store<Data>> {
}
async fn append_entry(store: &mut Store<Data>, entry: &Entry<Data>) -> Result<FilePosition>{
async fn append_entry(cursor: &mut Cursor<Data>, entry: &Entry<Data>) -> Result<FilePosition>{
println!("APPENDING");
println!("entry == {:?}", entry);
let file_position: FilePosition = store.append_entry(&entry).await.map_err(|e| e.to_io_or_panic())?;
let file_position: FilePosition = cursor.append_entry(&entry).await.map_err(|e| e.to_io_or_panic())?;
println!("file_position == {:?}", file_position);
Ok(file_position)
}
async fn read_entry(store: &mut Store<Data>, file_position: FilePosition) -> Result<Option<EntryDetailed<Data>>>{
async fn read_entry(cursor: &mut Cursor<Data>, file_position: FilePosition) -> Result<Option<EntryDetailed<Data>>>{
println!("READING ENTRY at file_position={}", file_position);
let entry = store.read_entry_at(file_position).await.map_err(|e| e.to_io_or_panic())?;
let entry = cursor.read_entry_at(file_position).await.map_err(|e| e.to_io_or_panic())?;
println!("ENTRY: {:?}", entry);
Ok(entry)
}
@ -71,17 +72,18 @@ async fn read_entry(store: &mut Store<Data>, file_position: FilePosition) -> Res
async fn main() -> Result<()> {
println!("STOOOOOOOOOOOORAAAAAAAAAAAGE");
let mut store: Store<Data> = create_or_connect().await?;
let store: Store<Data> = create_or_connect().await?;
// let entry0 = read_entry(&mut store, 16).await?;
// let entry1 = read_entry(&mut store, 45).await?;
// println!("{:?}", store);
// println!("{:?}", store.read_all_bytes().await?);
let mut cursor = store.cursor(AccessMode::Write).await.map_err(|e| e.to_io_or_panic())?;
let entry0: Entry<u32> = Entry::new(vec![99, 98, 97, 96, 95]);
append_entry(&mut store, &entry0).await?;
append_entry(&mut cursor, &entry0).await?;
store.read_entries().await.map_err(|e| e.to_io_or_panic())?;
cursor.read_entries().await.map_err(|e| e.to_io_or_panic())?;
// let entry2: StoreEntry<u32> = StoreEntry::new_deleted(vec![3, 2, 1]);