private ITable[] FindChangedTables(ITransaction checkTransaction, CommitTableInfo[] normalizedChangedTables)
{
var changedTableSource = new ITable[normalizedChangedTables.Length];
// Set up the above arrays
for (int i = 0; i < normalizedChangedTables.Length; ++i)
{
// Get the information for this changed table
CommitTableInfo tableInfo = normalizedChangedTables[i];
// Get the master table that changed from the normalized list.
TableSource master = tableInfo.Master;
// Did this table change since the transaction started?
TableEventRegistry[] allTableChanges = tableInfo.ChangesSinceCommit;
if (allTableChanges == null || allTableChanges.Length == 0)
{
// No changes so we can pick the correct IIndexSet from the current
// transaction.
// Get the state of the changed tables from the Transaction
var mtable = Transaction.GetMutableTable(master.TableName);
// Get the current index set of the changed table
tableInfo.IndexSet = Transaction.GetIndexSetForTable(master);
// Flush all index changes in the table
mtable.FlushIndexes();
// Set the 'check_transaction' object with the latest version of the
// table.
checkTransaction.UpdateVisibleTable(tableInfo.Master, tableInfo.IndexSet);
}
else
{
// There were changes so we need to merge the changes with the
// current view of the table.
// It's not immediately obvious how this merge update works, but
// basically what happens is we WriteByte the table journal with all the
// changes into a new IMutableTableDataSource of the current
// committed state, and then we flush all the changes into the
// index and then update the 'check_transaction' with this change.
// Create the IMutableTableDataSource with the changes from this
// journal.
var mtable = master.CreateTableAtCommit(checkTransaction, tableInfo.Journal);
// Get the current index set of the changed table
tableInfo.IndexSet = checkTransaction.GetIndexSetForTable(master);
// Flush all index changes in the table
mtable.FlushIndexes();
// Dispose the table
mtable.Dispose();
}
// And now refresh the 'changedTableSource' entry
changedTableSource[i] = checkTransaction.GetTable(master.TableName);
}
return(changedTableSource);
}
private void CheckConstraintViolations(ITransaction checkTransaction, CommitTableInfo[] normalizedChangedTables, ITable[] changedTableSource)
{
// Any tables that the constraints were altered for we need to check
// if any rows in the table violate the new constraints.
foreach (var tableId in ConstraintAlteredTables)
{
// We need to check there are no constraint violations for all the
// rows in the table.
for (int n = 0; n < normalizedChangedTables.Length; ++n)
{
CommitTableInfo tableInfo = normalizedChangedTables[n];
if (tableInfo.Master.TableId == tableId)
{
checkTransaction.CheckAddConstraintViolations(changedTableSource[n], ConstraintDeferrability.InitiallyDeferred);
}
}
}
// For each changed table we must determine the rows that
// were deleted and perform the remove constraint checks on the
// deleted rows. Note that this happens after the records are
// removed from the index.
// For each changed table,
for (int i = 0; i < normalizedChangedTables.Length; ++i)
{
CommitTableInfo tableInfo = normalizedChangedTables[i];
// Get the journal that details the change to the table.
TableEventRegistry changeJournal = tableInfo.Journal;
if (changeJournal != null)
{
// Find the normalized deleted rows.
int[] normalizedRemovedRows = changeJournal.RemovedRows.ToArray();
// Check removing any of the data doesn't cause a constraint
// violation.
checkTransaction.CheckRemoveConstraintViolations(changedTableSource[i], normalizedRemovedRows, ConstraintDeferrability.InitiallyDeferred);
// Find the normalized added rows.
int[] normalizedAddedRows = changeJournal.AddedRows.ToArray();
// Check adding any of the data doesn't cause a constraint
// violation.
checkTransaction.CheckAddConstraintViolations(changedTableSource[i], normalizedAddedRows, ConstraintDeferrability.InitiallyDeferred);
// Set up the list of added and removed rows
tableInfo.NormalizedAddedRows = normalizedAddedRows;
tableInfo.NormalizedRemovedRows = normalizedRemovedRows;
}
}
}
private CommitTableInfo[] GetNormalizedChangedTables()
{
// Create a normalized list of TableSource of all tables that
// were either changed (and not dropped), and created (and not dropped).
// This list represents all tables that are either new or changed in
// this transaction.
var normalizedChangedTables = new List <CommitTableInfo>(8);
// Add all tables that were changed and not dropped in this transaction.
normalizedChangedTables.AddRange(
ChangedTables.Select(tableJournal => new { tableJournal, tableId = tableJournal.TableId })
.Where(t => !DroppedTables.Contains(t.tableId))
.Select(t => new { t, masterTable = Composite.GetTableSource(t.tableId) })
.Select(t => new CommitTableInfo {
Master = t.masterTable,
Journal = t.t.tableJournal,
ChangesSinceCommit = t.masterTable.FindChangesSinceCmmit(CommitId).ToArray()
}));
// Add all tables that were created and not dropped in this transaction.
foreach (var tableId in CreatedTables)
{
// If this table is not dropped in this transaction then this is a
// new table in this transaction.
if (!DroppedTables.Contains(tableId))
{
TableSource masterTable = Composite.GetTableSource(tableId);
if (!CommitTableListContains(normalizedChangedTables, masterTable))
{
// This is for entries that are created but modified (no journal).
var tableInfo = new CommitTableInfo {
Master = masterTable
};
normalizedChangedTables.Add(tableInfo);
}
}
}
return(normalizedChangedTables.ToArray());
}
private CommitTableInfo[] GetNormalizedChangedTables()
{
// Create a normalized list of TableSource of all tables that
// were either changed (and not dropped), and created (and not dropped).
// This list represents all tables that are either new or changed in
// this transaction.
var normalizedChangedTables = new List<CommitTableInfo>(8);
// Add all tables that were changed and not dropped in this transaction.
normalizedChangedTables.AddRange(
ChangedTables.Select(tableJournal => new { tableJournal, tableId = tableJournal.TableId })
.Where(t => !DroppedTables.Contains(t.tableId))
.Select(t => new { t, masterTable = Composite.GetTableSource(t.tableId) })
.Select(t => new CommitTableInfo {
Master = t.masterTable,
Journal = t.t.tableJournal,
ChangesSinceCommit = t.masterTable.FindChangesSinceCmmit(CommitId).ToArray()
}));
// Add all tables that were created and not dropped in this transaction.
foreach (var tableId in CreatedTables) {
// If this table is not dropped in this transaction then this is a
// new table in this transaction.
if (!DroppedTables.Contains(tableId)) {
TableSource masterTable = Composite.GetTableSource(tableId);
if (!CommitTableListContains(normalizedChangedTables, masterTable)) {
// This is for entries that are created but modified (no journal).
var tableInfo = new CommitTableInfo {
Master = masterTable
};
normalizedChangedTables.Add(tableInfo);
}
}
}
return normalizedChangedTables.ToArray();
}
private void FireChangeEvents(ITransaction checkTransaction, CommitTableInfo[] normalizedChangedTables, Action<TableCommitInfo> commitActions)
{
if (commitActions == null)
return;
foreach (var tableInfo in normalizedChangedTables) {
// Get the journal that details the change to the table.
TableEventRegistry changeJournal = tableInfo.Journal;
if (changeJournal != null) {
// Get the table name
var tableName = tableInfo.Master.TableName;
commitActions(new TableCommitInfo(checkTransaction.CommitId, tableName, tableInfo.NormalizedAddedRows,
tableInfo.NormalizedAddedRows));
}
}
}
private ITable[] FindChangedTables(ITransaction checkTransaction, CommitTableInfo[] normalizedChangedTables)
{
var changedTableSource = new ITable[normalizedChangedTables.Length];
// Set up the above arrays
for (int i = 0; i < normalizedChangedTables.Length; ++i) {
// Get the information for this changed table
CommitTableInfo tableInfo = normalizedChangedTables[i];
// Get the master table that changed from the normalized list.
TableSource master = tableInfo.Master;
// Did this table change since the transaction started?
TableEventRegistry[] allTableChanges = tableInfo.ChangesSinceCommit;
if (allTableChanges == null || allTableChanges.Length == 0) {
// No changes so we can pick the correct IIndexSet from the current
// transaction.
// Get the state of the changed tables from the Transaction
var mtable = Transaction.GetMutableTable(master.TableName);
// Get the current index set of the changed table
tableInfo.IndexSet = Transaction.GetIndexSetForTable(master);
// Flush all index changes in the table
mtable.FlushIndexes();
// Set the 'check_transaction' object with the latest version of the
// table.
checkTransaction.UpdateVisibleTable(tableInfo.Master, tableInfo.IndexSet);
} else {
// There were changes so we need to merge the changes with the
// current view of the table.
// It's not immediately obvious how this merge update works, but
// basically what happens is we WriteByte the table journal with all the
// changes into a new IMutableTableDataSource of the current
// committed state, and then we flush all the changes into the
// index and then update the 'check_transaction' with this change.
// Create the IMutableTableDataSource with the changes from this
// journal.
var mtable = master.CreateTableAtCommit(checkTransaction, tableInfo.Journal);
// Get the current index set of the changed table
tableInfo.IndexSet = checkTransaction.GetIndexSetForTable(master);
// Flush all index changes in the table
mtable.FlushIndexes();
// Dispose the table
mtable.Dispose();
}
// And now refresh the 'changedTableSource' entry
changedTableSource[i] = checkTransaction.GetTable(master.TableName);
}
return changedTableSource;
}
private void CheckConstraintViolations(ITransaction checkTransaction, CommitTableInfo[] normalizedChangedTables, ITable[] changedTableSource)
{
// Any tables that the constraints were altered for we need to check
// if any rows in the table violate the new constraints.
foreach (var tableId in ConstraintAlteredTables) {
// We need to check there are no constraint violations for all the
// rows in the table.
for (int n = 0; n < normalizedChangedTables.Length; ++n) {
CommitTableInfo tableInfo = normalizedChangedTables[n];
if (tableInfo.Master.TableId == tableId) {
checkTransaction.CheckAddConstraintViolations(changedTableSource[n], ConstraintDeferrability.InitiallyDeferred);
}
}
}
// For each changed table we must determine the rows that
// were deleted and perform the remove constraint checks on the
// deleted rows. Note that this happens after the records are
// removed from the index.
// For each changed table,
for (int i = 0; i < normalizedChangedTables.Length; ++i) {
CommitTableInfo tableInfo = normalizedChangedTables[i];
// Get the journal that details the change to the table.
TableEventRegistry changeJournal = tableInfo.Journal;
if (changeJournal != null) {
// Find the normalized deleted rows.
int[] normalizedRemovedRows = changeJournal.RemovedRows.ToArray();
// Check removing any of the data doesn't cause a constraint
// violation.
checkTransaction.CheckRemoveConstraintViolations(changedTableSource[i], normalizedRemovedRows, ConstraintDeferrability.InitiallyDeferred);
// Find the normalized added rows.
int[] normalizedAddedRows = changeJournal.AddedRows.ToArray();
// Check adding any of the data doesn't cause a constraint
// violation.
checkTransaction.CheckAddConstraintViolations(changedTableSource[i], normalizedAddedRows, ConstraintDeferrability.InitiallyDeferred);
// Set up the list of added and removed rows
tableInfo.NormalizedAddedRows = normalizedAddedRows;
tableInfo.NormalizedRemovedRows = normalizedRemovedRows;
}
}
}
