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DynamoDBTransactionalStateStorage<TState> Methods

Provides DynamoDB-backed transactional state storage.

Load

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public Task<TransactionalStorageLoadResponse<TState>> Load()
Loads the authoritative transactional state from durable storage.

Returns

A task whose result is a coherent snapshot containing the current ETag, committed state and sequence number, transaction metadata, and pending prepare records in sequence-number order.

Store(string?, TransactionalStateMetaData, List<PendingTransactionState<TState>>, long?, long?)

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public Task<string> Store(string? expectedETag, TransactionalStateMetaData metadata, List<PendingTransactionState<TState>>? statesToPrepare, long? commitUpTo, long? abortAfter)
Stores transactional state changes.

Parameters

expectedETagstring?
The ETag from the most recent Orleans.Transactions.Abstractions.ITransactionalStateStorage.Load or successful Orleans.Transactions.Abstractions.ITransactionalStateStorage.Store, identifying the durable version to update.
metadataTransactionalStateMetaData
The transaction metadata which replaces the currently stored metadata.
statesToPrepareList<PendingTransactionState<TState>>
Prepare records to add or replace, keyed by their sequence numbers. A record replaces an existing record with the same sequence number. A null or empty list adds no prepare records.
commitUpTolong?
When non-null, advances the committed state through the prepared state with this sequence number and makes prepare records at or below that sequence obsolete.
abortAfterlong?
When non-null, removes pending prepare records whose sequence numbers are strictly greater than this value.

Returns

A task whose result is the ETag of the durable state produced by the completed operation. The returned ETag is used as expectedETag for the next update.