public DynamoDbEventStoreTableRequest(DynamoDbEventStoreOptions options)
{
if (options is null)
{
throw new ArgumentNullException(nameof(options));
}
TableName = options.StoreName;
AttributeDefinitions = new List <AttributeDefinition>
{
new AttributeDefinition("CorrelationId", ScalarAttributeType.S)
};
KeySchema = new List <KeySchemaElement>
{
new KeySchemaElement("CorrelationId", KeyType.HASH)
};
//TODO: Define stratety to others billing modes
BillingMode = options.BillingMode;
}
public DynamoDbEventStoreDatabaseContext(IAmazonDynamoDB dynamoDb, DynamoDbEventStoreOptions options)
{
DynamoDb = dynamoDb ?? throw new ArgumentNullException(nameof(dynamoDb));
Options = options ?? throw new ArgumentNullException(nameof(options));
}
private static async Task <List <V2EventStoreModel> > GetEventsAsync(this IDynamoDBContext context, Guid correlationId, DynamoDbEventStoreOptions options)
{
var events = new List <V2EventStoreModel>();
var query = context.QueryAsync <V2EventStoreModel>(correlationId.ToString(), new DynamoDBOperationConfig {
OverrideTableName = options.StoreName
});
do
{
events.AddRange(await query.GetNextSetAsync());
}while(query.IsDone is false);
return(events);
}
public static async Task DeleteEventsAsync <TSaga>(this IDynamoDBContext context, TSaga instance, DynamoDbEventStoreOptions options) where TSaga : class, IV2EventSourcedSaga
{
var events = await context.GetEventsAsync(instance.CorrelationId, options);
var writer = context.CreateBatchWrite <V2EventStoreModel>(new DynamoDBOperationConfig {
OverrideTableName = options.StoreName
});
writer.AddDeleteItems(events);
await writer.ExecuteAsync();
}
public static async Task SaveEventsAsync <TSaga>(this IDynamoDBContext context, TSaga instance, DynamoDbEventStoreOptions options) where TSaga : class, IV2EventSourcedSaga
{
var writer = context.CreateBatchWrite <V2EventStoreModel>(new DynamoDBOperationConfig {
OverrideTableName = options.StoreName
});
var changes = instance.GetChanges();
writer.AddPutItems(changes);
await writer.ExecuteAsync();
}
public static async Task <AggregatedEvents> LoadEventsAsync(this IDynamoDBContext context, Guid aggregateId, IEnumerable <Type> knownTypes, DynamoDbEventStoreOptions options)
{
var data = await context.GetEventsAsync(aggregateId, options);
var events = new List <object>();
if (data is null)
{
return new AggregatedEvents {
Events = events, LastVersion = null
}
}
;
events.AddRange(data.SelectMany(@event => JsonSerialization.Deserialize(@event, knownTypes)));
return(new AggregatedEvents {
Events = events, LastVersion = data.Max(model => model.Version), AggregateId = aggregateId.ToString()
});
}
