Trait TryLock 

pub trait TryLock {
    type LockError: Error + Send + Sync;

    // Required method
    fn try_lock(
        &self,
        lease_duration_ms: u32,
        key: &str,
        holder: &str,
    ) -> impl Future<Output = Result<Option<u64>, Self::LockError>> + SendOutsideWasm;
}

Trait used to try to take a lock. Foundation of CrossProcessLock.

Required Associated Types

type LockError: Error + Send + Sync

Available on non-target_family=wasm only.

Required Methods

fn try_lock( &self, lease_duration_ms: u32, key: &str, holder: &str, ) -> impl Future<Output = Result<Option<u64>, Self::LockError>> + SendOutsideWasm

Try to take a leased lock.

This attempts to take a lock for the given lease duration.

• If we already had the lease, this will extend the lease.
• If we didn’t, but the previous lease has expired, we will obtain the lock.
• If there was no previous lease, we will obtain the lock.
• Otherwise, we don’t get the lock.

Returns Some(_) to indicate the lock succeeded, None otherwise. The cross-process lock generation must be compared to the generation before the call to see if the lock has been dirtied: a different generation means the lock has been dirtied, i.e. taken by a different holder in the meantime.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl TryLock for LockableCryptoStore

type LockError = CryptoStoreError

Available on non-target_family=wasm only.

async fn try_lock( &self, lease_duration_ms: u32, key: &str, holder: &str, ) -> Result<Option<u64>, <LockableCryptoStore as TryLock>::LockError>

Implementors