/// <summary>
/// Create a new BatchInfo, containing all BatchPartInfo
/// </summary>
public BatchInfo(bool isInMemory, SyncSet inSchema, string rootDirectory = null, string directoryName = null)
{
this.InMemory = isInMemory;
// We need to create a change table set, containing table with columns not readonly
foreach (var table in inSchema.Tables)
{
SyncAdapter.CreateChangesTable(inSchema.Tables[table.TableName, table.SchemaName], this.SanitizedSchema);
}
// If not in memory, generate a directory name and initialize batch parts list
if (!this.InMemory)
{
this.DirectoryRoot = rootDirectory;
this.BatchPartsInfo = new List <BatchPartInfo>();
this.DirectoryName = string.IsNullOrEmpty(directoryName) ? string.Concat(DateTime.UtcNow.ToString("yyyy_MM_dd_ss"), Path.GetRandomFileName().Replace(".", "")) : directoryName;
}
}
/// <summary>
/// Create a response message content based on a requested index in a server batch info
/// </summary>
private async Task <HttpMessageSendChangesResponse> GetChangesResponseAsync(SyncContext syncContext, long remoteClientTimestamp, BatchInfo serverBatchInfo,
DatabaseChangesApplied clientChangesApplied, DatabaseChangesSelected serverChangesSelected, int batchIndexRequested)
{
// 1) Create the http message content response
var changesResponse = new HttpMessageSendChangesResponse(syncContext);
changesResponse.ServerChangesSelected = serverChangesSelected;
changesResponse.ClientChangesApplied = clientChangesApplied;
changesResponse.ServerStep = HttpStep.GetMoreChanges;
changesResponse.ConflictResolutionPolicy = this.Options.ConflictResolutionPolicy;
// If nothing to do, just send back
if (serverBatchInfo.InMemory || serverBatchInfo.BatchPartsInfo.Count == 0)
{
if (this.ClientConverter != null && serverBatchInfo.InMemoryData != null && serverBatchInfo.InMemoryData.HasRows)
{
BeforeSerializeRows(serverBatchInfo.InMemoryData, this.ClientConverter);
}
changesResponse.Changes = serverBatchInfo.InMemoryData == null ? new ContainerSet() : serverBatchInfo.InMemoryData.GetContainerSet();
changesResponse.BatchIndex = 0;
changesResponse.IsLastBatch = true;
changesResponse.RemoteClientTimestamp = remoteClientTimestamp;
return(changesResponse);
}
// Get the batch part index requested
var batchPartInfo = serverBatchInfo.BatchPartsInfo.First(d => d.Index == batchIndexRequested);
// if we are not in memory, we set the BI in session, to be able to get it back on next request
// create the in memory changes set
var changesSet = new SyncSet();
foreach (var table in Schema.Tables)
{
SyncAdapter.CreateChangesTable(Schema.Tables[table.TableName, table.SchemaName], changesSet);
}
await batchPartInfo.LoadBatchAsync(changesSet, serverBatchInfo.GetDirectoryFullPath(), this);
// if client request a conversion on each row, apply the conversion
if (this.ClientConverter != null && batchPartInfo.Data.HasRows)
{
BeforeSerializeRows(batchPartInfo.Data, this.ClientConverter);
}
changesResponse.Changes = batchPartInfo.Data.GetContainerSet();
changesResponse.BatchIndex = batchIndexRequested;
changesResponse.IsLastBatch = batchPartInfo.IsLastBatch;
changesResponse.RemoteClientTimestamp = remoteClientTimestamp;
changesResponse.ServerStep = batchPartInfo.IsLastBatch ? HttpStep.GetMoreChanges : HttpStep.GetChangesInProgress;
// If we have only one bpi, we can safely delete it
if (batchPartInfo.IsLastBatch)
{
// delete the folder (not the BatchPartInfo, because we have a reference on it)
if (this.Options.CleanFolder)
{
var shouldDeleteFolder = true;
if (!string.IsNullOrEmpty(this.Options.SnapshotsDirectory))
{
var dirInfo = new DirectoryInfo(serverBatchInfo.DirectoryRoot);
var snapInfo = new DirectoryInfo(this.Options.SnapshotsDirectory);
shouldDeleteFolder = dirInfo.FullName != snapInfo.FullName;
}
if (shouldDeleteFolder)
{
serverBatchInfo.TryRemoveDirectory();
}
}
}
return(changesResponse);
}
/// <summary>
/// Get changes from
/// </summary>
internal async Task <HttpMessageSendChangesResponse> ApplyThenGetChangesAsync(HttpMessageSendChangesRequest httpMessage, SessionCache sessionCache,
int clientBatchSize, CancellationToken cancellationToken = default, IProgress <ProgressArgs> progress = null)
{
// Overriding batch size options value, coming from client
// having changes from server in batch size or not is decided by the client.
// Basically this options is not used on the server, since it's always overriden by the client
this.Options.BatchSize = clientBatchSize;
// Get if we need to serialize data or making everything in memory
var clientWorkInMemory = clientBatchSize == 0;
// Get context from request message
var ctx = httpMessage.SyncContext;
// Set the context coming from the client
this.SetContext(ctx);
// Check schema.
// If client has stored the schema, the EnsureScope will not be called on server.
if (this.Schema == null || !this.Schema.HasTables || !this.Schema.HasColumns)
{
var serverScopeInfo = await this.EnsureSchemaAsync(cancellationToken, progress).ConfigureAwait(false);
this.Schema = serverScopeInfo.Schema;
this.Schema.EnsureSchema();
}
// ------------------------------------------------------------
// FIRST STEP : receive client changes
// ------------------------------------------------------------
// We are receiving changes from client
// BatchInfo containing all BatchPartInfo objects
// Retrieve batchinfo instance if exists
// Get batch info from session cache if exists, otherwise create it
if (sessionCache.ClientBatchInfo == null)
{
sessionCache.ClientBatchInfo = new BatchInfo(clientWorkInMemory, Schema, this.Options.BatchDirectory);
}
// create the in memory changes set
var changesSet = new SyncSet();
foreach (var table in httpMessage.Changes.Tables)
{
SyncAdapter.CreateChangesTable(Schema.Tables[table.TableName, table.SchemaName], changesSet);
}
changesSet.ImportContainerSet(httpMessage.Changes, false);
// If client has made a conversion on each line, apply the reverse side of it
if (this.ClientConverter != null && changesSet.HasRows)
{
AfterDeserializedRows(changesSet, this.ClientConverter);
}
// add changes to the batch info
await sessionCache.ClientBatchInfo.AddChangesAsync(changesSet, httpMessage.BatchIndex, httpMessage.IsLastBatch, this);
// Clear the httpMessage set
if (!clientWorkInMemory && httpMessage.Changes != null)
{
httpMessage.Changes.Clear();
}
// Until we don't have received all the batches, wait for more
if (!httpMessage.IsLastBatch)
{
return new HttpMessageSendChangesResponse(httpMessage.SyncContext)
{
ServerStep = HttpStep.SendChangesInProgress
}
}
;
// ------------------------------------------------------------
// SECOND STEP : apply then return server changes
// ------------------------------------------------------------
// get changes
var(remoteClientTimestamp, serverBatchInfo, _, clientChangesApplied, serverChangesSelected) =
await this.ApplyThenGetChangesAsync(httpMessage.Scope, sessionCache.ClientBatchInfo, cancellationToken, progress).ConfigureAwait(false);
// Save the server batch info object to cache if not working in memory
if (!clientWorkInMemory)
{
sessionCache.RemoteClientTimestamp = remoteClientTimestamp;
sessionCache.ServerBatchInfo = serverBatchInfo;
sessionCache.ServerChangesSelected = serverChangesSelected;
sessionCache.ClientChangesApplied = clientChangesApplied;
}
// Get the firt response to send back to client
return(await GetChangesResponseAsync(ctx, remoteClientTimestamp, serverBatchInfo, clientChangesApplied, serverChangesSelected, 0));
}