Daniel Fisher(lennybacon) - SOA, Data and the Web

Friday, October 19, 2007

A few days ago a developer at a customer asked me how he could simplify the following code as he identified a pattern: X tries and the error handling.

public PlanungsGruppenLesenA PlanungsGruppenLesen(      
    PlanungsGruppenLesenF param)
{
    PlanungsGruppenLesenA ret = new PlanungsGruppenLesenA();
 
    if (ret.PlanungsGruppen == null)
    {
        throw new ArgumentNullException("param.PlanungsGruppen");
    }
    int nRetry = 0;
    while (nRetry < DBWerkzeug.MaxWiederholungen)
    {
        try
        {
            using (XXX_POC.POC db = 
                new XXX_POC.POC(      
                    DBWerkzeug.GetConnectionString()))
            {
                var q = 
                    from p in db.Stammdaten_Planungsgruppe
                    orderby p.Name.ToLower()
                    select new PlanungsGruppeDM
                    {
                        ID = p.Rowid,
                        Name = p.Name
                    };
                ret.PlanungsGruppen = q.ToList<PlanungsGruppeDM>();
            } 
        }
        catch (ChangeConflictException e)
        {
            nRetry++;
            if (nRetry >= DBWerkzeug.MaxWiederholungen)
            {
                ret.FehlerText = e.Message;
                ret.HatFehler = true;
                throw;
            }
        }
        catch (Exception e)
        {
            ret.FehlerText = e.Message;
            ret.HatFehler = true;
            throw;
        }
    }
    return ret;
}

I ended up with this:

public PlanungsGruppenLesenA PlanungsGruppenLesen(      
    PlanungsGruppenLesenF param)
{
    PlanungsGruppenLesenA ret = new PlanungsGruppenLesenA();
 
    if (ret.PlanungsGruppen == null)
    {
        throw new ArgumentNullException("param.PlanungsGruppen");
    }
    ret.PlanungsGruppen = CatchExceptions<PlanungsGruppeDM>(
        delegate
        { 
            using (XXX_POC.POC db = 
                new XXX_POC.POC(      
                    DBWerkzeug.GetConnectionString()))
            {
                var q = 
                    from p in db.Stammdaten_Planungsgruppe
                    orderby p.Name.ToLower()
                    select new PlanungsGruppeDM
                    {
                        ID = p.Rowid,
                        Name = p.Name
                    };
                return q.ToList<PlanungsGruppeDM>();
            }
        },
        ret);            
    return ret;
}

What calls the encapsulated X tries and the error handling:

public delegate List<T> MachMal<T>();
 
public static List<T> CatchExceptions<T>(MachMal<T> machMichFertig, BasisA ret)
{
    int nRetry = 0;
    while (nRetry < DBWerkzeug.MaxWiederholungen)
    {
        try
        {
            return machMichFertig();
        }
        catch (ChangeConflictException e)
        {
            nRetry++;
            if (nRetry >= DBWerkzeug.MaxWiederholungen)
            {
                ret.FehlerText = e.Message;
                ret.HatFehler = true;
                throw;
            }
        }
        catch (Exception e)
        {
            ret.FehlerText = e.Message;
            ret.HatFehler = true;
            throw;
        }
    }
    return null;
}

But I'm not quite sure If this made stuff really easier ;-)

C# | Projects

Friday, October 19, 2007 3:20:12 PM (W. Europe Standard Time, UTC+01:00)

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Saturday, October 06, 2007

JSON support for IE

Pretty helpful while working on WCF services with JSON serialization and AJAX:

REGEDIT4

[HKEY_CURRENT_USER\Software\Classes\Mime\Database\Content Type\application/json]
"CLSID"="{25336920-03F9-11cf-8FD0-00AA00686F13}"
"Extension"=".json"

Saturday, October 06, 2007 10:59:18 PM (W. Europe Standard Time, UTC+01:00)

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Friday, August 31, 2007

NRW07 - succeeded!

Last friday we (Stephan Oetzel and me - JustCommunity e.V.) held the NRW07 (Germany's biggest software developer and IT professional community conference) in my hometown Wuppertal at die Börse.

The organization of the event and founding the company devcoach were the reason why it was pretty quite around my blog the last months - so sorry for that.

Photo by Thomas Freudenberg

The event was a huge success. we had around 130 people (including speakers) - a great audience from all over the country.

We hat 4 tracks each filled up with 6 sessions including one dedicated IT-Pro track. We were proud to host Craig Murphy and Oliver Sturm from the UK community again. Thanks for puting the "tech" into the event to Sascha Dietl, Thomas Freudenberg, Marcel Gnoth, Marcus Hoeltkemeier, Mischa Hüschen, Lars Keller, Constantin Klein, Patrick Lauer, Nico Lüdemann, Carsten Möhrke, Craig Murphy, Sebastian Noack, Jens Schaller, Frank Solinske, Oliver Sturm, Roland Weigelt, Thomas Weinert, Michael Willers.

I also gotta shout out many thanks to our sponsors (especially Christian Schütz from HP, platinum sponsor) and the organization team for making NRW07 happen. Upfront Sylvia Marx (Ping her If you need design stuff like a blog & web design!) who filled the role of our Art Director and managed most of the merchandising stuff (look at the cool shirts!!!).

The day was filled with amazing things. Night before we had a fabolous geek dinner and Craig podcasted me. In the morning I really enjoied the audience in my talk about SOA on the client and User Interface Patterns. We had tasty Subway catering. And last but not least a unforgettable after event party that ended up early early next morning.

Craig and Thomas pointed me to facebook.com where a lot of post-NRW07 things (photos etc.) happen - so have a look over there and at Karim's and Kai's blog, saopbox!

Hope you liked it as well - if you haven't had the chance to make up your own mind... 2008 is near.

off for vacation

--Daniel

Friday, August 31, 2007 9:24:31 PM (W. Europe Standard Time, UTC+01:00)

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Monday, July 30, 2007

Running ReSharper 3.0 with VS 2008 (Beta 2)

This morning I downloaded Visual Studio 2008 Beta 2.0 and installed it over the day. As always when a new version is out I'm looking forward to use the new features, but... As always I start missing the Add-Ins I usually use in the old version of the IDE - especially this is the case with ReSharper. So I tried out a few things and finally got it to run.

1) Add the path to ReSharper's Bin directory to the "Add-In File Paths" (Tools |Options | Environment | Add-in/Macro Security)

2) Import the following text as *.reg file to your registry (modify path to ReSharper to fit you setup if necessary).

REGEDIT4

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\Menues]
"{0c6e6407-13fc-4878-869a-c8b4016c57fe}"=",2007,5"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\InstalledProducts\Resharper]
"Package"="{0c6e6407-13fc-4878-869a-c8b4016c57fe}"
"UseInterface"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\Packages\{0c6e6407-13fc-4878-869a-c8b4016c57fe}]
@="JetBrains.ReSharper.VS, Version=3.0.471.2, Culture=neutral, PublicKeyToken=null"
"Class"="JetBrains.ReSharper.VS.Customization.ReSharperPkg"
"Assembly"="JetBrains.ReSharper.VS"
"InprocServer32"="C:\\Windows\\system32\\\\mscoree.dll"
"CodeBase"="C:\\Program Files\\JetBrains\\ReSharper\\v3.0\\vs8.0\\\\Bin\\JetBrains.ReSharper.VS.dll"
"CompanyName"="JetBrains s.r.o."
"ProductName"="ReSharper"
"ProductVersion"="3.0"
"MinEdition"="standard"
"ID"=dword:0000029a

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\ToolWindows\{0024BEE0-BCE9-484F-AFA7-B5647916C26B}]
@="{0C6E6407-13FC-4878-869A-C8B4016C57FE}"
"Name"="ReSharper StackTraceManager"
"DefaultCaption"="Stack Trace Explorer"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\ToolWindows\{04612F0D-0B03-4D82-8726-14E6D4143E6C}]
@="{0C6E6407-13FC-4878-869A-C8B4016C57FE}"
"Name"="ReSharper FileStructureView"
"DefaultCaption"="File Structure"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\ToolWindows\{1EA986C6-340F-42C8-892E-F5779818D569}]
@="{0C6E6407-13FC-4878-869A-C8B4016C57FE}"
"Name"="ReSharper SearchResultsWindow"
"DefaultCaption"="Find Results"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\ToolWindows\{532DDD98-F6A6-4A76-A84E-4AEA5211F733}]
@="{0C6E6407-13FC-4878-869A-C8B4016C57FE}"
"Name"="ReSharper UnitTestExplorerWindow"
"DefaultCaption"="Unit Test Explorer"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\ToolWindows\{7DD08AD7-93B2-491F-A0E8-EE2BB4E78240}]
@="{0C6E6407-13FC-4878-869A-C8B4016C57FE}"
"Name"="ReSharper ErrorsView"
"DefaultCaption"="Errors"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\ToolWindows\{AB97F511-6AF2-4D27-B468-E4048600093E}]
@="{0C6E6407-13FC-4878-869A-C8B4016C57FE}"
"Name"="ReSharper HierarchyResultsWindow"
"DefaultCaption"="Type Hierarchy"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\ToolWindows\{AE42D903-E5A3-417D-BA25-3CE77B315EED}]
@="{0C6E6407-13FC-4878-869A-C8B4016C57FE}"
"Name"="ReSharper TodoExplorerWindow"
"DefaultCaption"="To-do Explorer"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\ToolWindows\{B2BC9916-E3E6-43A8-AD5F-3BDB95F53DB5}]
@="{0C6E6407-13FC-4878-869A-C8B4016C57FE}"
"Name"="ReSharper UnitTestSessionsWindow"
"DefaultCaption"="Unit Test Sessions"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\9.0\ToolWindows\{BE8B4DEB-7D8A-454D-91A8-31C32BE2BD94}]
@="{0C6E6407-13FC-4878-869A-C8B4016C57FE}"
"Name"="ReSharper Resharper.CodeBehindToolwindow"
"DefaultCaption"="Code Behind"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\8.0\ToolWindows\{1067D97D-D956-4E91-849C-07DE62F0E620}]
@="{0C6E6407-13FC-4878-869A-C8B4016C57FE}"
"Name"="ReSharper BuildOutput"
"DefaultCaption"="Build Output"

Monday, July 30, 2007 7:41:27 PM (W. Europe Standard Time, UTC+01:00)

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Monday, July 23, 2007

My shopping list for today :-)

1 x Intel Core 2 Duo E6850 (4096Kb/2x3Ghz) 64bit (Conroe)
1 x Arctic Freezer 7 Pro
4 x 2048MB DDR2
1 x Chieftec "Bravo-Series" Tower (400W) Black
3 x HITACHI DeskStar 250GB (SATA II)
1 x ABIT IN9 32X-MAX WiFi "Beast"
1 x DVD-RW SATA
1 x NVIDIA Geforce Club3D 8600GT (512MB)

Monday, July 23, 2007 7:32:54 PM (W. Europe Standard Time, UTC+01:00)

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Saturday, July 21, 2007

IKEA Page Flow

copyblogger has a nice story on "IKEA content"...

After a discussion with my colleague Michael Willers (his famous security blog is down moving and will be up again soon...) I'd like to push it further/see it from a different point of view: (Especially in the web) Applications are content or at least provide content (That is the was HTTP, REST, etc. work).

I think also Jacob Nielson would agree that forcing the user to use a path instead of allowing the user to decide is wrong.

Keep that in mind when you think of using page flow/task concepts in your applications.

P.S.: I got to admit that I like some of the IKEA furniture :-)

Saturday, July 21, 2007 1:03:02 PM (W. Europe Standard Time, UTC+01:00)

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Monday, April 23, 2007

IE Active Content Update

I'm back on ASP.NET (at least more than last year :-) ) - And it feels great (again) digging deep into some interesting areas around user interfaces (also WPF!!!), processes and tasks, state management, async stuff (multi threading/AJAX & JSON) and so on...

Personal Ref.:

Activating ActiveX Controls
Adobe's comments on the topic...

IE Persistence Behaviour
Tabbed Browsing for Developers
Search Provider Extensibility in Internet Explorer

ASP.NET | Projects

Monday, April 23, 2007 3:50:17 PM (W. Europe Standard Time, UTC+01:00)

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About

Daniel Fisher is a co-founder of devcoach® (www.devcoach.com), a company that supports and accompanies customers in projects with the Microsoft® .NET platform all through from architecture to deployment.

Daniel has a strong emphasis on service-orientation (SOA), agile methodologies and processes, the web and data access.

He is a recognized expert in the SOA-field and plans and realizes distributed systems on the Microsoft platform since many years. Daniel is one of the early Windows Communication Foundation (WCF) experts and was a member of the technical adoption program for the Microsoft Corporation.

For the federal office for security in information technology of the German government he and Michael Willers have created a security analysis and written practice-proven guidelines for the daily work with WCF. As experts for the topic "SOA with .NET" they traveled through Europe to discuss the requirements of architects from all over the world and help them implement solutions.

Daniel is developing software since 1995 (since 1999 on the .NET platform) and has worked several years on projects as a developer, architect, project lead and consultant for insurance companies, distributors, mobile communications hardware, construction supplies and various other companies of different branches.

He is actively contributing to the software developer community as chair-man of JustCommunity e.V. (www.justcommunity.de), organizer of the biggest regional community event, and lead of a user group.

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