"Each message is sent with a delivery confirmation. If not consumed, the router issues a reversal of the whole transactions. I am not getting into details, you get the idea. "
I think the questions are in regard to if you application crashes or loses power etc if you are only storing your transactions in memory (or only writing occasionally to some form of persistence). It also gives you the benefit of being able to run your batching out of process ... read my post again about checking up on prevalence layers .. they work with plain files (no need to deal with a database or possible downtime) and would allow you to do this out of process .. our largest latency ever recorded was 3ms usually we were under 1ms using bamboo ... this seems to meet all of your requirements (also using bamboo on an existing object graph is near trivial). This relates to your problem in that using a shared store would allow you to write a 20 line console app that goes to that shared data store then just schedule it using existing mechanisms as opposed to rolling your own. Why recreate the wheel? Cheers, Greg On 9/27/06, Eddie Lascu <[EMAIL PROTECTED]> wrote:
Oh, we do have persistence by means of MSMQ messages passed between the Router and the clients. Each message is sent with a delivery confirmation. If not consumed, the router issues a reversal of the whole transactions. I am not getting into details, you get the idea. Relying on the database as a repository introduces another dependency in the chain - POS payments should continue to work, even when a particular database is down. Lets get back to the original problem, please. -----Original Message----- From: Discussion of advanced .NET topics. [mailto:[EMAIL PROTECTED] Behalf Of gregory young Sent: Wednesday, September 27, 2006 6:02 PM To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM Subject: Re: [ADVANCED-DOTNET] Triggering events at precise moments of the day bah clicked soon too quick .. I meant to say .. having done almost an identical task in the past the persistence penalty is fairly minimal compared ot the remote transaction of getting approval .. we were often taking 1-2 seconds (high end) on the approval compared to < 50 ms for a database save .. < 3 ms for a prevalence layer save. On 9/27/06, gregory young <[EMAIL PROTECTED]> wrote: > And what is your plan if the router dies? btw: having done almost > exact things such as this in the past .. Are you are trading down time > for a db failure for catastrophic failure in the case that your > service dies? Have you considerred looking at using a prevalence > layer? when I said db I was more referring to persistence of some > sort. > > Cheers, > > Greg > > On 9/27/06, Eddie Lascu <[EMAIL PROTECTED]> wrote: > > Adding the database storage introduces two issues: > > > > 1. performance penalty - extra time needed to save and update transaction > > information; > > 2. downtime in the case of non-responsive database - this is something that > > my client would not accept. > > > > All the transactions are eventually saved to the database, in a bigger > > context, by the client that originated the request. The POS transactions are > > routed back to the clients and they are in charge to save them to the local > > database. > > > > -----Original Message----- > > From: Discussion of advanced .NET topics. > > [mailto:[EMAIL PROTECTED] Behalf Of gregory young > > Sent: Wednesday, September 27, 2006 5:49 PM > > To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM > > Subject: Re: [ADVANCED-DOTNET] Triggering events at precise moments of > > the day > > > > > > You beat me to it John .. > > > > What I would do here is keep the transactions in a database ... and > > have a seperate application close the batch by being run at a given > > time (updating the database). > > > > Cheers, > > > > Greg > > > > On 9/27/06, John Bergman <[EMAIL PROTECTED]> wrote: > > > Is your app runing in the foreground, or as a windows service? > > > > > > > All those totals and counts are maintained in the memory > > > > > > What do you do if the power goes out? > > > > > > -----Original Message----- > > > From: Discussion of advanced .NET topics. > > > [mailto:[EMAIL PROTECTED] On Behalf Of Eddie Lascu > > > Sent: Wednesday, September 27, 2006 4:44 PM > > > To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM > > > Subject: Re: [ADVANCED-DOTNET] Triggering events at precise moments of > > > the day > > > > > > Ok, my bad, I didn't fully describe my application. It has to run 100% > > > of the time as it does a lot of stuff. It is a router for Point-of-Sale > > > transactions. It routes POS requests between multiple POS stations and > > > the clearing operator that performs all the credit/debit card payments. > > > This application of mine keeps track of all the transactions that are > > > performed and at precise moments most close some batches and reconcile > > > all the transactions with the clearing operator. All those totals and > > > counts are maintained in the memory and I need something to trigger > > > batch close operations at precise moments of the day. > > > So, it doesn't do only the events I was talking about but lots of other > > > stuff. > > > > > > -----Original Message----- > > > From: Discussion of advanced .NET topics. > > > [mailto:[EMAIL PROTECTED] Behalf Of John Bergman > > > Sent: Wednesday, September 27, 2006 5:35 PM > > > To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM > > > Subject: Re: [ADVANCED-DOTNET] Triggering events at precise moments of > > > the day > > > > > > > > > It really depends on what you need to do. > > > > > > You could write a C# program that manipulates the other objects and > > > structures anyway you want. You could schedule that using the at > > > command (windows task scheduler) and even include a set of command line > > > parameters for it to run and decide what to do internally. > > > > > > -----Original Message----- > > > From: Discussion of advanced .NET topics. > > > [mailto:[EMAIL PROTECTED] On Behalf Of Eddie Lascu > > > Sent: Wednesday, September 27, 2006 4:34 PM > > > To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM > > > Subject: Re: [ADVANCED-DOTNET] Triggering events at precise moments of > > > the day > > > > > > They don't have COM Interfaces (my app is a plain C# win service). Could > > > you elaborate on your second solution? > > > Thanks. > > > > > > -----Original Message----- > > > From: Discussion of advanced .NET topics. > > > [mailto:[EMAIL PROTECTED] Behalf Of John Bergman > > > Sent: Wednesday, September 27, 2006 5:30 PM > > > To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM > > > Subject: Re: [ADVANCED-DOTNET] Triggering events at precise moments of > > > the day > > > > > > > > > You could use VBScript to interact with them if they have COM > > > interfaces, or you can start an Executable with the scheduler itself. > > > > > > -----Original Message----- > > > From: Discussion of advanced .NET topics. > > > [mailto:[EMAIL PROTECTED] On Behalf Of Eddie Lascu > > > Sent: Wednesday, September 27, 2006 4:28 PM > > > To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM > > > Subject: Re: [ADVANCED-DOTNET] Triggering events at precise moments of > > > the day > > > > > > How would that interact with all the structures and objects that are > > > created in my app? > > > > > > -----Original Message----- > > > From: Discussion of advanced .NET topics. > > > [mailto:[EMAIL PROTECTED] Behalf Of gregory young > > > Sent: Wednesday, September 27, 2006 5:25 PM > > > To: ADVANCED-DOTNET@DISCUSS.DEVELOP.COM > > > Subject: Re: [ADVANCED-DOTNET] Triggering events at precise moments of > > > the day > > > > > > > > > Well depending what you are doing I would prbably just use windows > > > scheduler. > > > > > > On 9/27/06, Eddie Lascu <[EMAIL PROTECTED]> wrote: > > > > Hello experts, > > > > > > > > I need to call a method in my console app/win service at precise > > > > moments > > > of > > > > the day. When I say precise I mean +/- a few seconds. The number of > > > > events triggered and the time of the day when they should be triggered > > > > > > > is > > > variable. > > > > If only one method call must be performed, then it should always be > > > > approximately at the same time of the day, say midnight. If two events > > > > > > > are to be fired, they should be say 12 hours apart, noon and midnight, > > > > > > > and so on. The configuration part I can handle. I need some ideas on > > > > how to > > > trigger > > > > the events. > > > > I thought about having a dedicated thread where I would have lots of > > > > sleep periods in an infinite loop. After each sleep period, I could > > > > compare the current time with the time of the next event that must be > > > > fired. The event would have to be fired in X seconds and I would enter > > > > > > > in a new sleep > > > period > > > > for X/2 seconds. Eventually, the difference between the current time > > > > and > > > the > > > > time of the next event would become smaller that an acceptable delta, > > > > at which moment I would fire the event and would enter in a new sleep > > > period. > > > > This way the events would always be fired at approximately the same > > > > times > > > of > > > > the day, and I wouldn't have to worry about the moment when the > > > > application/win service was started. > > > > I am not particularly proud of this solution as it seems kind of > > > > empiric, but I just couldn't think of anything else. > > > > Can you gals and guys come up with a more elegant and reliable > > > approach? > > > > > > > > TIA, > > > > Eddie > > > > > > > > =================================== > > > > This list is hosted by DevelopMentor(r) http://www.develop.com > > > > > > > > View archives and manage your subscription(s) at > > > http://discuss.develop.com > > > > > > > > > > > > > -- > > > If knowledge can create problems, it is not through ignorance that we > > > can solve them. > > > > > > Isaac Asimov > > > > > > =================================== > > > This list is hosted by DevelopMentor(r) http://www.develop.com > > > > > > View archives and manage your subscription(s) at > > > http://discuss.develop.com > > > > > > =================================== > > > This list is hosted by DevelopMentor(r) http://www.develop.com > > > > > > View archives and manage your subscription(s) at > > > http://discuss.develop.com > > > > > > =================================== > > > This list is hosted by DevelopMentor. http://www.develop.com > > > > > > View archives and manage your subscription(s) at > > > http://discuss.develop.com > > > > > > =================================== > > > This list is hosted by DevelopMentor(r) http://www.develop.com > > > > > > View archives and manage your subscription(s) at > > > http://discuss.develop.com > > > > > > =================================== > > > This list is hosted by DevelopMentor. http://www.develop.com > > > > > > View archives and manage your subscription(s) at > > > http://discuss.develop.com > > > > > > =================================== > > > This list is hosted by DevelopMentor(r) http://www.develop.com > > > > > > View archives and manage your subscription(s) at > > > http://discuss.develop.com > > > > > > =================================== > > > This list is hosted by DevelopMentor(r) http://www.develop.com > > > > > > View archives and manage your subscription(s) at > > http://discuss.develop.com > > > > > > > > > -- > > If knowledge can create problems, it is not through ignorance that we > > can solve them. > > > > Isaac Asimov > > > > =================================== > > This list is hosted by DevelopMentor(r) http://www.develop.com > > > > View archives and manage your subscription(s) at http://discuss.develop.com > > > > =================================== > > This list is hosted by DevelopMentor(r) http://www.develop.com > > > > View archives and manage your subscription(s) at http://discuss.develop.com > > > > > -- > If knowledge can create problems, it is not through ignorance that we > can solve them. > > Isaac Asimov > -- If knowledge can create problems, it is not through ignorance that we can solve them. Isaac Asimov =================================== This list is hosted by DevelopMentor� http://www.develop.com View archives and manage your subscription(s) at http://discuss.develop.com =================================== This list is hosted by DevelopMentor� http://www.develop.com View archives and manage your subscription(s) at http://discuss.develop.com
-- If knowledge can create problems, it is not through ignorance that we can solve them. Isaac Asimov
