[−][src]Trait growthring::wal::WALFile

pub trait WALFile {
#[must_use]    fn allocate<'life0, 'async_trait>(
        &'life0 self, 
        offset: WALPos, 
        length: usize
    ) -> Pin<Box<dyn Future<Output = Result<(), ()>> + 'async_trait>>
    where
        'life0: 'async_trait,
        Self: 'async_trait;

#[must_use]    fn write<'life0, 'async_trait>(
        &'life0 self, 
        offset: WALPos, 
        data: WALBytes
    ) -> Pin<Box<dyn Future<Output = Result<(), ()>> + 'async_trait>>
    where
        'life0: 'async_trait,
        Self: 'async_trait;

    fn read(
        &self, 
        offset: WALPos, 
        length: usize
    ) -> Result<Option<WALBytes>, ()>;

    fn truncate(&self, length: usize) -> Result<(), ()>;
}

Required methods

#[must_use]fn allocate<'life0, 'async_trait>(
    &'life0 self,
    offset: WALPos,
    length: usize
) -> Pin<Box<dyn Future<Output = Result<(), ()>> + 'async_trait>> where
    'life0: 'async_trait,
    Self: 'async_trait, 

Initialize the file space in [offset, offset + length) to zero.

#[must_use]fn write<'life0, 'async_trait>(
    &'life0 self,
    offset: WALPos,
    data: WALBytes
) -> Pin<Box<dyn Future<Output = Result<(), ()>> + 'async_trait>> where
    'life0: 'async_trait,
    Self: 'async_trait, 

Write data with offset. We assume all previous allocate/truncate invocations are visible if ordered earlier (should be guaranteed by most OS). Additionally, the write caused by each invocation of this function should be atomic (the entire single write should be all or nothing).

fn read(&self, offset: WALPos, length: usize) -> Result<Option<WALBytes>, ()>

Read data with offset. Return Ok(None) when it reaches EOF.

fn truncate(&self, length: usize) -> Result<(), ()>

Truncate a file to a specified length.

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Implementors

impl WALFile for WALFileAIO[src]

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