Struct InstrumentedHashedCursor 

pub struct InstrumentedHashedCursor<C> { /* private fields */ }

Available on crate feature metrics only.

A wrapper around a HashedCursor that tracks metrics for cursor operations.

Counters are recorded into the supplied metric handles when the cursor is dropped.

This implementation counts the number of times each cursor operation is called:

• next() - Move to the next entry
• seek() - Seek to a key or the next greater key

Trait Implementations

impl<C: Debug> Debug for InstrumentedHashedCursor<C>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<C> Drop for InstrumentedHashedCursor<C>

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics #130494)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.

impl<C> HashedCursor for InstrumentedHashedCursor<C>

where C: HashedCursor,

type Value = <C as HashedCursor>::Value

Value returned by the cursor.

fn seek( &mut self, key: B256, ) -> Result<Option<(B256, Self::Value)>, DatabaseError>

Seek an entry greater than or equal to the given key and position the cursor there. Returns the first entry with the key greater than or equal to the sought key.

fn next(&mut self) -> Result<Option<(B256, Self::Value)>, DatabaseError>

Move the cursor to the next entry and return it.

fn reset(&mut self)

Reset the cursor to its initial state.

impl<C> HashedStorageCursor for InstrumentedHashedCursor<C>

where C: HashedStorageCursor,

fn is_storage_empty(&mut self) -> Result<bool, DatabaseError>

Returns true if the current hashed address has no storage entries.

fn set_hashed_address(&mut self, hashed_address: B256)

Set the hashed address for the storage cursor.

Layout

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.