GrainStateWithMetaData<TView> Properties

1. Documentation
2. API reference
3. Microsoft.Orleans.EventSourcing
4. GrainStateWithMetaData<TView>
5. Properties

Markdown

A class that extends grain state with versioning metadata, so that a log-consistent grain can use a standard storage provider.

GlobalVersion

getset

View source

[Orleans.Id(1)]
public int GlobalVersion

The length of the log

State

getset

View source

[Orleans.Id(0)]
public TView State

The stored view of the log

WriteVector

getset

View source

[Orleans.Id(2)]
public string WriteVector

Metadata that is used to avoid duplicate appends. Logically, this is a (string->bit) map, the keys being replica ids But this map is represented compactly as a simple string to reduce serialization/deserialization overhead Bits are read by Orleans.EventSourcing.StateStorage.GrainStateWithMetaData.GetBit and flipped by Orleans.EventSourcing.StateStorage.GrainStateWithMetaData.FlipBit. Bits are toggled when writing, so that the retry logic can avoid appending an entry twice when retrying a failed append.