Trait PageCacheBuiler 

pub trait PageCacheBuiler<T: PageCache> {
    // Required method
    fn create(page_size: usize, extra_size: usize, bpurgeable: bool) -> T;
}

Required Methods

fn create(page_size: usize, extra_size: usize, bpurgeable: bool) -> T

SQLite invokes the create method to construct a new cache instance. SQLite will typically create one cache instance for each open database file, though this is not guaranteed. The first parameter, page_size, is the size in bytes of the pages that must be allocated by the cache. page_size will always a power of two. The second parameter extra_size is a number of bytes of extra storage associated with each page cache entry. The extra_size parameter will a number less than 250. SQLite will use the extra extra bytes on each page to store metadata about the underlying database page on disk. The value passed depends on the SQLite version, the target platform, and how SQLite was compiled. The third argument to create, bpurgeable, is true if the cache being created will be used to cache database pages of a file stored on disk, or false if it is used for an in-memory database. The cache implementation does not have to do anything special based with the value of bPurgeable; it is purely advisory. On a cache where bPurgeable is false, SQLite will never invoke [unpin] except to deliberately delete a page. In other words, calls to [unpin] on a cache with bPurgeable set to false will always have the “discard” flag set to true. Hence, a cache created with bPurgeable false will never contain any unpinned pages.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors