public SystemUserSession(IDatabase database, ITransaction transaction, string currentSchema)
{
Database = database;
CurrentSchema =currentSchema;
Transaction = transaction;
SessionInfo = new SessionInfo(User.System, transaction.Isolation);
}
/// <summary>
/// Constructs the session for the given user and transaction to the
/// given database.
/// </summary>
/// <param name="database">The database to which the user is connected.</param>
/// <param name="transaction">A transaction that handles the commands issued by
/// the user during the session.</param>
/// <param name="sessionInfo">The information about the session to be created (user,
/// connection endpoint, statistics, etc.)</param>
/// <seealso cref="ITransaction"/>
/// <seealso cref="SessionInfo"/>
public UserSession(IDatabase database, ITransaction transaction, SessionInfo sessionInfo)
{
if (database == null)
throw new ArgumentNullException("database");
if (transaction == null)
throw new ArgumentNullException("transaction");
if (sessionInfo == null)
throw new ArgumentNullException("sessionInfo");
if (sessionInfo.User.IsSystem ||
sessionInfo.User.IsPublic)
throw new ArgumentException(String.Format("Cannot open a session for user '{0}'.", sessionInfo.User.Name));
Database = database;
Transaction = transaction;
Database.DatabaseContext.Sessions.Add(this);
SessionInfo = sessionInfo;
}
public static IUserSession CreateUserSession(this IDatabase database, SessionInfo sessionInfo)
{
if (sessionInfo == null)
throw new ArgumentNullException("sessionInfo");
// TODO: if the isolation is not specified, use a configured default one
var isolation = sessionInfo.Isolation;
if (isolation == TransactionIsolation.Unspecified)
isolation = TransactionIsolation.Serializable;
if (sessionInfo.CommitId >= 0)
throw new ArgumentException("Cannot create a session that reference an existing commit state.");
var transaction = database.CreateTransaction(isolation);
return new UserSession(database, transaction, sessionInfo);
}
public static IUserSession OpenUserSession(this IDatabase database, SessionInfo sessionInfo)
{
if (sessionInfo == null)
throw new ArgumentNullException("sessionInfo");
var commitId = sessionInfo.CommitId;
if (commitId < 0)
throw new ArgumentException("Invalid commit reference specified.");
var transaction = database.FindTransactionById(commitId);
if (transaction == null)
throw new InvalidOperationException(String.Format("The request transaction with ID '{0}' is not open.", commitId));
return new UserSession(database, transaction, sessionInfo);
}
