Trait mmtkvdb::Env

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pub trait Env: AsRef<EnvRo> {
    // Required methods
    fn txn_ro(&self) -> Result<TxnRo<'_>>;
    fn max_keysize(&self) -> usize;
    fn valid_keysize<'kr, K, KRef>(&self, key: KRef) -> bool
       where K: ?Sized + Storable + 'kr,
             KRef: StorableRef<'kr, K>;
    unsafe fn open_db<K, V, C>(
        &self,
        options: &DbSpec<K, V, C>
    ) -> Result<Db<K, V, C>>
       where K: ?Sized + Storable,
             V: ?Sized + Storable,
             C: Constraint;
    fn clear_stale_readers(&self) -> Result<usize>;

    // Provided methods
    fn as_env_ro(&self) -> &EnvRo { ... }
    fn clone_ro(&self) -> EnvRo { ... }
}

Expand description

Read-write or read-only handle for accessing environment that stores key-value databases

This trait is implemented by EnvRo and EnvRw and provides the methods for read-only access to the environment. Read-write access is performed by methods directly implemented on EnvRw.

Required Methods§

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fn txn_ro(&self) -> Result<TxnRo<'_>>

Start read-only transaction

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fn max_keysize(&self) -> usize

Get maximum size of keys and duplicate data

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fn valid_keysize<'kr, K, KRef>(&self, key: KRef) -> boolwhere K: ?Sized + Storable + 'kr, KRef: StorableRef<'kr, K>,

Checks if key or duplicate data has valid size

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unsafe fn open_db<K, V, C>( &self, options: &DbSpec<K, V, C> ) -> Result<Db<K, V, C>>where K: ?Sized + Storable, V: ?Sized + Storable, C: Constraint,

Open database in environment

Safety

If a database exists already, it must have been created with compatible options.
Implementation of Storable for the used keys and values must behave the same as when the database was created.

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