protected override void Execute(CodeActivityContext activityContext)
{
QueryPartitionBase queryPartition = QueryPartition.Get(activityContext);
switch (queryPartition.Query.ExecutionMode)
{
case ExecutionMode.SingleServer:
queryPartition.InitializeQueryObject(null, null, true);
break;
case ExecutionMode.Graywulf:
using (var context = ContextManager.Instance.CreateContext(this, activityContext, ConnectionMode.AutoOpen, TransactionMode.AutoCommit))
{
var scheduler = activityContext.GetExtension <IScheduler>();
//queryPartition.DatabaseVersionName = queryPartition.Query.SourceDatabaseVersionName; TODO: delete
queryPartition.InitializeQueryObject(context, scheduler, false);
var dss = queryPartition.FindRequiredDatasets();
// Check if there are any Graywulf datasets referenced in the query
var assignmydb = (dss.Values.FirstOrDefault(ds => !ds.IsSpecificInstanceRequired) == null);
// *** TODO: replace this whole thing to use JOIN graphs
// If no graywulf datasets are used, use the server containing myDB,
// otherwise ask the scheduler for an appropriate server
if (dss.Count == 0 || assignmydb)
{
// use MyDB's server
var ef = new EntityFactory(context);
var federation = queryPartition.FederationReference.Value;
var user = ef.LoadEntity <User>(context.UserGuid);
var di = federation.MyDBDatabaseVersion.GetUserDatabaseInstance(user);
queryPartition.AssignedServerInstance = di.ServerInstance;
}
else
{
// Assign new server instance
var si = new ServerInstance(context);
si.Guid = scheduler.GetNextServerInstance(
dss.Values.Where(x => !x.IsSpecificInstanceRequired).Select(x => x.DatabaseDefinition.Guid).ToArray(),
queryPartition.Query.SourceDatabaseVersionName,
null);
si.Load();
queryPartition.AssignedServerInstance = si;
}
queryPartition.InitializeQueryObject(context, scheduler, true);
EntityGuid.Set(activityContext, queryPartition.AssignedServerInstance.Guid);
}
break;
}
}
protected override void Execute(CodeActivityContext activityContext)
{
QueryPartitionBase querypartition = QueryPartition.Get(activityContext);
using (Context context = querypartition.Query.CreateContext(this, activityContext, ConnectionMode.AutoOpen, TransactionMode.AutoCommit))
{
querypartition.InitializeQueryObject(context);
querypartition.FindRemoteTableReferences();
}
}
protected override void Execute(CodeActivityContext activityContext)
{
QueryPartitionBase querypartition = QueryPartition.Get(activityContext);
using (Context context = querypartition.Query.CreateContext(this, activityContext, ConnectionMode.AutoOpen, TransactionMode.AutoCommit))
{
querypartition.InitializeQueryObject(context);
}
querypartition.DropTemporaryTables();
querypartition.DropTemporaryViews();
}