View Replies (2)
Using PowerBuilder Classic .NET assemblies From Multi-Threaded .NET Environments
  1. Issue
  2.  .NET Assembly
  3.  IIS
0 Votes
  1. Tom Mills
  2. PowerBuilder
  3. Thursday, 17 August 2017 09:16 PM UTC

Hi,

I posted this on the SAP forums, but this looks like the place to be.

We're in the process of refactoring a large PowerBuilder application with the goal of keeping our business logic in PB and exposing it as an API for .NET developers by using the .NET assembly target.  We are currently working in PowerBuilder 12.6 Classic, but have played around with the trial for PowerBuilder 2017.

The environments we need to support include multi-threaded environments like IIS and xUnit. In using xUnit (which defaults to running tests in parallel), we've encountered an issue where database connections made on separate threads are interfering with each other. We've also reproduced this issue from a multi-threaded .NET console application, so we're expecting it to be an issue under IIS as well.

We've created a very simple .NET assembly that just exposes a connection nvo that wraps a native PB transaction stored as an instance variable in the class. We are not using SQLCA or any global variables. The connection object just has connect and disconnect methods. We import this assembly into a .NET xUnit project, create three separate test classes where each runs a test that instantiates a local connection instance and loops ten times, just connecting and disconnecting with each iteration.

If we force xUnit to run tests serially, we can repeatedly run all tests without issue. If we let xUnit parallelize the execution of the three test classes, we get random errors. Sometimes after connecting we'll get a "transaction not connected" exception when immediately trying to disconnect or when attempting to connect we'll get a "transaction already connected" exception. Sometimes everything works fine.

We've tried this with different database interfaces - SNC, ODBC, ADO.Net - and they all exhibit the same behavior.  We've tried this in PB 12.5 Classic, PB 12.6 Classic, and PB 2017.  All show the same problem.

I guess our first question is: this should be possible correct? I'd imagine others have successfully used PB Classic's .NET assemblies from within an environment like IIS?

Assuming this should be possible, I have a sample that demonstrates the issue (didn't see an option to upload here) or I can provide the main source files to demonstrate the issue.


Thanks for any insight or help you can give.
Tom

Setting Font in Rich Text Edit Control Error with Fundamentals Course database
Responses (2)
  1. Likes
  2. Latest
  3. Oldest

Find Questions by Tag

.EXE .NET 6.0 .NET Assembly .NET Core 3.1 .NET Core Framework .NET DataStore .NET Std Framework 32-bit 64-bit ADO.NET AEM AI Algorithm Amazon AWS Android Apache API APK App Store App Store (Apple) Appeon Workspace Appeon Xcelerator Plug-in Architecture Array ASE Asynchronous Methods Authentication AutoBuild AutoCompiler Automated Testing Automation AutoScript Azure Barcode Base64 Batch BigData BLOB Branch & Merge Browser Bug Build Button C# C# Class Importer C# Editor C# Model generator Calendar Camera Certificate Chrome Citrix Class Client Client/Server Cloud Cluster Collection COM Command Line Compiler Compression Computed Field Configuration Controls Cookies Cordova Crash Cross-Platform Crosstab CSharpAssembly CSharpObject CSS CSV Cursor Data Database Database Driver Database Painter Database Profile Database Provider DataObject DataSource DataStore DataStore (C#) DataStore (PS) DataType DataWindow DATE DATETIME DB2 Debug Debugger Debugging Deployment Design DLL DO-WHILE Dockable Docker Documentation DOUBLE Download DragDrop Edge Edit Style Editor Elevate Conference Email Embedded SQL Emulator Encoding Encryption Enhancement Request Entity Entity Framework ERP Error Event Event Handler Event Handling Excel Exception Export Expression External Functions F# Field File File Access Filter Firefox Firewall Font FOR-NEXT Foreground Format Function Garbage Collection GeoLocation Git Graph HANA Hash Header HTML/5 HTTP/S HTTPClient Icon IDE Identity IIS IMAPI Import InfoMaker Inheritance Installation Integer IntelliSense Interface Internet Internet Explorer iOS IPA iPad iPhone IWA J# Java JavaScript JBoss JDBC JOIN JSON JSONGenerator JSONParser Kestrel Label Lambda Large File LDAP Library License LINQ Linux OS Load Balancing Localization Localized PBVM Log In Log Out Logging LONG LONGLONG macOS MAPI Maps MDI Memory Memory Leak Menu Merge MessageBox Messagging Method Migration MIME TYPE Mobile Model ModelStore ModelStore (C#) MSOLEDBSQL Multi Threading MVC MySQL n-Tier Namespace NativePDF NVO OAuth ODATA ODBC Office Offline OLE OLEDB Online Open Source OpenAPI OpenSSL Oracle OrcaScript Other Outlook Output Package Parameter Patch PayPal PB Classic PB Native PB.NET PBC PBD PBDOM PBG PBJVM PBL PBNI PBORCA PBVM PBX PDF Performance Permission PFC Picture Pipeline Play Store (Google) Plugin Popup Port POST PostgreSQL PowerBuilder PowerBuilder (Appeon) PowerBuilder (SAP) PowerBuilder Compiler PowerBuilder Runtime PowerClient PowerScript (PS) PowerScript IDE PowerScript Migrator PowerServer PowerServer Mobile PowerServer Toolkit PowerServer Web PowerServerLabel Print Properties Proxy Publish PULL PUSH Query Regression Release Renew Resize Response REST Retrieve RibbonBar RibbonBar Builder Rich Text Roadmap RPC Runtime Packager SaaS Scaffolding Script SDI SDK Security Server Service Session Single Sign-on Size SMTP SMTPClient SnapDevelop SOAP Sort Source Code Speech Recognition SQL SQL Anywhere SQL Server SqlBuilder SqlExecutor SQLite SqlModelMapper Storage Stored Procedure Subscription SVN Swagger Syntax TabbedBar TabbedView Tablet TabPage Target TE Control Testing Text TFS Theme TIME Timer TLS/SSL Tomcat TortoiseGit TortoiseSVN Transaction Transparency Trial Trigger TRY-CATCH TX Control Type UI ULONG UltraLite Uninstall Unit Test Unit Testing UNIX OS Update Upgrade Upload URL User Center User Object UWP Validation VARCHAR Variable Versioning Visual Studio Visual Studio Code VM Voice Warning WCF Web API Web Extensions Web Service WebBrowser WebForms WebLogic WebSphere WildFly WinAPI Window Windows OS WinForms Wizard Workgroup Workspace WPF XCODE XHTML XML Zoom
✖

Helpful?

If a reply or comment is helpful for you, please don’t hesitate to click the Helpful button. This action is further confirmation of their invaluable contribution to the Appeon Community.