/// <summary>
/// Generate an empty BatchInfo
/// </summary>
internal (BatchInfo, DatabaseChangesSelected) GetEmptyChanges(MessageGetChangesBatch message)
{
// Get config
var isBatched = message.BatchSize > 0;
// create the in memory changes set
var changesSet = new SyncSet(message.Schema.ScopeName);
// Create a Schema set without readonly tables, attached to memory changes
foreach (var table in message.Schema.Tables)
{
DbSyncAdapter.CreateChangesTable(message.Schema.Tables[table.TableName, table.SchemaName], changesSet);
}
// Create the batch info, in memory
var batchInfo = new BatchInfo(!isBatched, changesSet, message.BatchDirectory);;
// add changes to batchInfo
batchInfo.AddChanges(new SyncSet());
// Create a new empty in-memory batch info
return(batchInfo, new DatabaseChangesSelected());
}
/// <summary>
/// update configuration object with tables desc from server database
/// </summary>
public virtual async Task <SyncContext> CreateSnapshotAsync(SyncContext context, SyncSet schema,
DbConnection connection, DbTransaction transaction, string batchDirectory, int batchSize, long remoteClientTimestamp,
CancellationToken cancellationToken, IProgress <ProgressArgs> progress = null)
{
// create local directory
if (!Directory.Exists(batchDirectory))
{
Directory.CreateDirectory(batchDirectory);
}
// numbers of batch files generated
var batchIndex = 0;
// create the in memory changes set
var changesSet = new SyncSet();
// Create a Schema set without readonly tables, attached to memory changes
foreach (var table in schema.Tables)
{
DbSyncAdapter.CreateChangesTable(schema.Tables[table.TableName, table.SchemaName], changesSet);
}
var sb = new StringBuilder();
var underscore = "";
if (context.Parameters != null)
{
foreach (var p in context.Parameters.OrderBy(p => p.Name))
{
var cleanValue = new string(p.Value.ToString().Where(char.IsLetterOrDigit).ToArray());
var cleanName = new string(p.Name.Where(char.IsLetterOrDigit).ToArray());
sb.Append($"{underscore}{cleanName}_{cleanValue}");
underscore = "_";
}
}
var directoryName = sb.ToString();
directoryName = string.IsNullOrEmpty(directoryName) ? "ALL" : directoryName;
var directoryFullPath = Path.Combine(batchDirectory, directoryName);
if (Directory.Exists(directoryFullPath))
{
Directory.Delete(directoryFullPath, true);
}
// batchinfo generate a schema clone with scope columns if needed
var batchInfo = new BatchInfo(false, changesSet, batchDirectory, directoryName);
// Clear tables, we will add only the ones we need in the batch info
changesSet.Clear();
foreach (var syncTable in schema.Tables)
{
var tableBuilder = this.GetTableBuilder(syncTable);
var syncAdapter = tableBuilder.CreateSyncAdapter(connection, transaction);
// raise before event
context.SyncStage = SyncStage.TableChangesSelecting;
var tableChangesSelectingArgs = new TableChangesSelectingArgs(context, syncTable.TableName, connection, transaction);
// launch interceptor if any
await this.InterceptAsync(tableChangesSelectingArgs).ConfigureAwait(false);
// Get Select initialize changes command
var selectIncrementalChangesCommand = this.GetSelectChangesCommand(context, syncAdapter, syncTable, true);
// Set parameters
this.SetSelectChangesCommonParameters(context, syncTable, null, true, 0, selectIncrementalChangesCommand);
// Get the reader
using (var dataReader = selectIncrementalChangesCommand.ExecuteReader())
{
// memory size total
double rowsMemorySize = 0L;
// Create a chnages table with scope columns
var changesSetTable = DbSyncAdapter.CreateChangesTable(schema.Tables[syncTable.TableName, syncTable.SchemaName], changesSet);
while (dataReader.Read())
{
// Create a row from dataReader
var row = CreateSyncRowFromReader(dataReader, changesSetTable);
// Add the row to the changes set
changesSetTable.Rows.Add(row);
var fieldsSize = ContainerTable.GetRowSizeFromDataRow(row.ToArray());
var finalFieldSize = fieldsSize / 1024d;
if (finalFieldSize > batchSize)
{
throw new RowOverSizedException(finalFieldSize.ToString());
}
// Calculate the new memory size
rowsMemorySize += finalFieldSize;
// Next line if we don't reach the batch size yet.
if (rowsMemorySize <= batchSize)
{
continue;
}
// add changes to batchinfo
batchInfo.AddChanges(changesSet, batchIndex, false);
// increment batch index
batchIndex++;
// we know the datas are serialized here, so we can flush the set
changesSet.Clear();
// Recreate an empty ContainerSet and a ContainerTable
changesSet = new SyncSet();
changesSetTable = DbSyncAdapter.CreateChangesTable(schema.Tables[syncTable.TableName, syncTable.SchemaName], changesSet);
// Init the row memory size
rowsMemorySize = 0L;
}
}
selectIncrementalChangesCommand.Dispose();
}
if (changesSet != null && changesSet.HasTables)
{
batchInfo.AddChanges(changesSet, batchIndex, true);
}
// Check the last index as the last batch
batchInfo.EnsureLastBatch();
batchInfo.Timestamp = remoteClientTimestamp;
// Serialize on disk.
var jsonConverter = new JsonConverter <BatchInfo>();
var summaryFileName = Path.Combine(directoryFullPath, "summary.json");
using (var f = new FileStream(summaryFileName, FileMode.CreateNew, FileAccess.ReadWrite))
{
var bytes = jsonConverter.Serialize(batchInfo);
f.Write(bytes, 0, bytes.Length);
}
return(context);
}
/// <summary>
/// Gets a batch of changes to synchronize when given batch size,
/// destination knowledge, and change data retriever parameters.
/// </summary>
/// <returns>A DbSyncContext object that will be used to retrieve the modified data.</returns>
public virtual async Task <(SyncContext, BatchInfo, DatabaseChangesSelected)> GetChangeBatchAsync(
SyncContext context, MessageGetChangesBatch message,
DbConnection connection, DbTransaction transaction,
CancellationToken cancellationToken, IProgress <ProgressArgs> progress = null)
{
// batch info containing changes
BatchInfo batchInfo;
// Statistics about changes that are selected
DatabaseChangesSelected changesSelected;
if (context.SyncWay == SyncWay.Upload && context.SyncType == SyncType.Reinitialize)
{
(batchInfo, changesSelected) = this.GetEmptyChanges(message);
return(context, batchInfo, changesSelected);
}
// Check if the provider is not outdated
var isOutdated = this.IsRemoteOutdated();
// Get a chance to make the sync even if it's outdated
if (isOutdated)
{
var outdatedArgs = new OutdatedArgs(context, null, null);
// Interceptor
await this.InterceptAsync(outdatedArgs).ConfigureAwait(false);
if (outdatedArgs.Action != OutdatedAction.Rollback)
{
context.SyncType = outdatedArgs.Action == OutdatedAction.Reinitialize ? SyncType.Reinitialize : SyncType.ReinitializeWithUpload;
}
if (outdatedArgs.Action == OutdatedAction.Rollback)
{
throw new OutOfDateException();
}
}
// create local directory
if (message.BatchSize > 0 && !string.IsNullOrEmpty(message.BatchDirectory) && !Directory.Exists(message.BatchDirectory))
{
Directory.CreateDirectory(message.BatchDirectory);
}
// numbers of batch files generated
var batchIndex = 0;
// Check if we are in batch mode
var isBatch = message.BatchSize > 0;
// Create stats object to store changes count
var changes = new DatabaseChangesSelected();
// create the in memory changes set
var changesSet = new SyncSet(message.Schema.ScopeName);
// Create a Schema set without readonly columns, attached to memory changes
foreach (var table in message.Schema.Tables)
{
DbSyncAdapter.CreateChangesTable(message.Schema.Tables[table.TableName, table.SchemaName], changesSet);
}
// Create a batch info in memory (if !isBatch) or serialized on disk (if isBatch)
// batchinfo generate a schema clone with scope columns if needed
batchInfo = new BatchInfo(!isBatch, changesSet, message.BatchDirectory);
// Clear tables, we will add only the ones we need in the batch info
changesSet.Clear();
foreach (var syncTable in message.Schema.Tables)
{
// if we are in upload stage, so check if table is not download only
if (context.SyncWay == SyncWay.Upload && syncTable.SyncDirection == SyncDirection.DownloadOnly)
{
continue;
}
// if we are in download stage, so check if table is not download only
if (context.SyncWay == SyncWay.Download && syncTable.SyncDirection == SyncDirection.UploadOnly)
{
continue;
}
var tableBuilder = this.GetTableBuilder(syncTable);
var syncAdapter = tableBuilder.CreateSyncAdapter(connection, transaction);
// raise before event
context.SyncStage = SyncStage.TableChangesSelecting;
var tableChangesSelectingArgs = new TableChangesSelectingArgs(context, syncTable.TableName, connection, transaction);
// launch interceptor if any
await this.InterceptAsync(tableChangesSelectingArgs).ConfigureAwait(false);
// Get Command
var selectIncrementalChangesCommand = this.GetSelectChangesCommand(context, syncAdapter, syncTable, message.IsNew);
// Set parameters
this.SetSelectChangesCommonParameters(context, syncTable, message.ExcludingScopeId, message.IsNew, message.LastTimestamp, selectIncrementalChangesCommand);
// Statistics
var tableChangesSelected = new TableChangesSelected(syncTable.TableName);
// Get the reader
using (var dataReader = selectIncrementalChangesCommand.ExecuteReader())
{
// memory size total
double rowsMemorySize = 0L;
// Create a chnages table with scope columns
var changesSetTable = DbSyncAdapter.CreateChangesTable(message.Schema.Tables[syncTable.TableName, syncTable.SchemaName], changesSet);
while (dataReader.Read())
{
// Create a row from dataReader
var row = CreateSyncRowFromReader(dataReader, changesSetTable);
// Add the row to the changes set
changesSetTable.Rows.Add(row);
// Set the correct state to be applied
if (row.RowState == DataRowState.Deleted)
{
tableChangesSelected.Deletes++;
}
else if (row.RowState == DataRowState.Modified)
{
tableChangesSelected.Upserts++;
}
// calculate row size if in batch mode
if (isBatch)
{
var fieldsSize = ContainerTable.GetRowSizeFromDataRow(row.ToArray());
var finalFieldSize = fieldsSize / 1024d;
if (finalFieldSize > message.BatchSize)
{
throw new RowOverSizedException(finalFieldSize.ToString());
}
// Calculate the new memory size
rowsMemorySize += finalFieldSize;
// Next line if we don't reach the batch size yet.
if (rowsMemorySize <= message.BatchSize)
{
continue;
}
// add changes to batchinfo
batchInfo.AddChanges(changesSet, batchIndex, false);
// increment batch index
batchIndex++;
// we know the datas are serialized here, so we can flush the set
changesSet.Clear();
// Recreate an empty ContainerSet and a ContainerTable
changesSet = new SyncSet(message.Schema.ScopeName);
changesSetTable = DbSyncAdapter.CreateChangesTable(message.Schema.Tables[syncTable.TableName, syncTable.SchemaName], changesSet);
// Init the row memory size
rowsMemorySize = 0L;
}
}
}
selectIncrementalChangesCommand.Dispose();
context.SyncStage = SyncStage.TableChangesSelected;
if (tableChangesSelected.Deletes > 0 || tableChangesSelected.Upserts > 0)
{
changes.TableChangesSelected.Add(tableChangesSelected);
}
// Event progress & interceptor
context.SyncStage = SyncStage.TableChangesSelected;
var tableChangesSelectedArgs = new TableChangesSelectedArgs(context, tableChangesSelected, connection, transaction);
this.ReportProgress(context, progress, tableChangesSelectedArgs);
await this.InterceptAsync(tableChangesSelectedArgs).ConfigureAwait(false);
}
// We are in batch mode, and we are at the last batchpart info
// Even if we don't have rows inside, we return the changesSet, since it contains at leaset schema
if (changesSet != null && changesSet.HasTables)
{
batchInfo.AddChanges(changesSet, batchIndex, true);
}
// Check the last index as the last batch
batchInfo.EnsureLastBatch();
return(context, batchInfo, changes);
}
