private void GetEventProviderInformation(SqlDataReader dataReader)
{
// event provider global identity
_eventProviderIdentity = new EventProviderIdentity(dataReader.GetGuid(0));
// read snapshot
_sqlSnapshot = GetSnapshot(dataReader);
}
public ProjectionInstance(ProjectionType projectionType, EventProviderIdentity eventProviderIdentity, ProjectionPosition position)
{
Contract.Requires(projectionType != null);
Contract.Requires(eventProviderIdentity != null);
Contract.Requires(position != null);
ProjectionType = projectionType;
EventProviderIdentity = eventProviderIdentity;
Position = position;
}
public GetPositionCommand(ITypeFactory typeFactory,
ProjectionType projectionType,
EventProviderIdentity eventProviderIdentity)
{
Contract.Requires(typeFactory != null);
Contract.Requires(projectionType != null);
Contract.Requires(eventProviderIdentity != null);
_projectionType = projectionType;
_eventProviderIdentity = eventProviderIdentity;
_command = CreateSqlCommand(typeFactory, projectionType, eventProviderIdentity);
}
public async Task <ProjectionInstance> GetPositionAsync <TProjection>(EventProviderIdentity eventProviderIdentity) where TProjection : IProjection
{
// establish command
var command = new GetPositionCommand(_typeFactory, new ProjectionType(typeof(TProjection)), eventProviderIdentity);
// create connection
using (var conn = new SqlConnection(_connectionString))
{
// connection needs to be open before executing
conn.Open();
// execute
return(await command.ExecuteAsync(conn));
}
}
private SqlCommand CreateSqlCommand(ITypeFactory typeFactory, ProjectionType projectionType, EventProviderIdentity eventProviderIdentity)
{
var sqlCommand = new SqlCommand("[dbo].[GetProjectionPosition]");
sqlCommand.CommandType = CommandType.StoredProcedure;
// set parameters
sqlCommand.Parameters.Add("@projectionId", SqlDbType.UniqueIdentifier).Value = typeFactory.GetHash(projectionType.Type);
sqlCommand.Parameters.Add("@eventProviderId", SqlDbType.UniqueIdentifier).Value = eventProviderIdentity.Value;
return(sqlCommand);
}
