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Question

Evgeny Shvarov · May 26, 2017

What Is the Best Object Callback for Insert Operations: %OnBeforSave(), %OnAddToSaveSet(), %OnAfterSave()

Hi!

I'm saving object instance using RestForms.

RESTFormsUI calls %Save() for me, which is great. But I want to set the property CreationDate with the current date for every new record being inserted.

So object callback implementation seems as a reasonable option. I did the following:

#Code Snippet #Object Data Model #ObjectScript #Caché

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Question

Sean Connelly · Apr 19, 2017

WebSockets vs Long Polling vs Short Polling?

WebSockets look to be supported reasonably well in Cache. I have yet to use them in production so I am wondering how well it has worked for other developers.

In particular what happens when the browser does not support WebSockets, or when a firewall blocks the connection.

Have you had to write your own long polling fall-back?

I've read the documentation and found this interesting article...

https://community.intersystems.com/post/asynchronous-websockets-quick-tutorial

#Node.js #Tutorial #CSP #Caché

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Article

Sean Connelly · Mar 28, 2017 2m read

Map, Reduce and Filter Collections

Inspired by the article "Declarative development in Caché" that's still trending on the dev com. The OP explored a functional style of iterating over a collection. A comment today suggested "Caché would need syntax support for anonymous functions".

With Macros you can kind of get anonymous like syntax using dot notation.

This is not production code, but it does work. First the macros...

#Caché #Code Snippet #ObjectScript #Mapping #Tips & Tricks

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Article

Evgeny Shvarov · Jan 5, 2017 1m read

Notifications for the posts' updates and how to turn off it

Hi!

Today DC supports the notifications for the posts' updates. It means if someone changes the post text, title, group or tag you can be notified about that.

But this notifications just inform that there were updates, but do not show what exactly was changed in the post.

So through this, you can get the notifications for the posts from previous years without any reason what's happened.

I would suggest to turn off this types of notifications until we'll implement the details in notifications, what exactly was changed in the post and why did you get it.

#DC Feedback #Developer Community FAQ

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Article

Brendan Bannon · Dec 27, 2016 8m read

The Art of Mapping Globals to Classes (5 of 3)

Mapping Examples

Clearly if you have a fourth article in the trilogy you need to go for the money grab and write the fifth, so here it is!

#Mapping #Object Data Model #SQL #Caché

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Question

Anzelem Sanyatwe · Oct 25, 2016

ISCAgent Auto-Startup in a Mirror Configuration on a Veritas Cluster

ISCAgent is automatically installed with Cache, runs as a service and can be configured to
start with the system. This is fine – but the complication comes when this is on VCS clusters with
Mirroring on. When installing a Single Instance of Cache in a Cluster, point number 2. Says “Create
a link from /usr/local/etc/cachesys to the shared disk. This forces the Caché registry and all
supporting files to be stored on the shared disk resource you have configured as part of the
service group.”

#High Availability #Mirroring #Caché

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Article

Evgeny Shvarov · Jul 25, 2016 2m read

Developer Community email notification subscriptions

Hi, Community!

Today there are two main settings for your email notification subscriptions.

1. Subscribe to all new posts, all comments, all answers

You can do it in your subscription settings in the Content Types. Click on My Account, go to Subscriptions and click on Content types tab:

#DC Feedback #Developer Community FAQ

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Article

Eduard Lebedyuk · Jul 5, 2016 3m read

Useful auto-generated methods

For each defined property, query or an index, several corresponding methods would be automatically generated on a class compilation. These methods can be very useful. In this article, I would describe some of them.

#Best Practices #Code Snippet #Object Data Model #Caché #InterSystems IRIS

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Question

Nikita Savchenko · Jun 1, 2016

What is the best way to serialize object/list/array/etc to string?

Hello!

Are there any short ways of serializing COS entity to the string? I am searching for something like .$toJSON() , but I need Caché 2013.* support.

The one way I supposed to work is to use $listbuild:

set str = $LISTTOSTRING($LB(1,2,3,",",5))
set list = $LISTFROMSTRING(str,",")
zw list
list=$lb("1","2","3","","","5")

#Caché #ObjectScript

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Question

Paul Reesman · May 18, 2016

Ensemble HTTP OnProcessInput

I am just trying to make a quick hand off HTTP production. I have the class built and compiled onto the server and the production is running as a service. When the production is called (by an inbound job) I can see that the HTTP.InboundAdapter is being used successfully and the stack continues all the up to ProcessInput where OnProcessInput is called in Ens.BusinessService.

#Business Service #ObjectScript #Ensemble

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