#Compiler

As a developer, you have probably spent at least some time writing repetetive code. You may have even found yourself wishing you could generate the code programmatically. If this sounds familiar, this article is for you!

We'll start with an example. Note: the following examples use the %DynamicObject interface, which requires Caché 2016.2 or later. If you are unfamiliar with this class, check out the documentation here: Using JSON in Caché. It's really cool!

In this article I would like to tell you about macros in InterSystems Caché. A macro is a symbolic name that is replaced with a set of instructions during compilation. A macro can “unfold” in various instruction sets each time it is called, depending on the parameters passed to it and activated scenarios. This can be both static code and the result of ObjectScript execution. Let's take a look at how you can use them in your application.

On the back of my recent post on writing bug-less code I wanted to raise a few suggestions (to ISC) that would help prevent certain types of bugs at compile time. I've probably missed a few, but these are the main ones in my mind. Please contribute more suggestions.

Btw, these also serve as potential gotchas for new COS developers.

hi-

Can someone give me an example of how to JOB a class method that requires an array of values to be passed to it by reference.

This is what I tried, but am getting compile errors because of the .params

job ##class(%SYSTEM.OBJ.FM2Class).All(.params)::5

Any thoughts on how to accomplish this, the simplest way. I would like to avoid writing all of this to some global and having to write some wrapper to pick it up and then call the class method, which I certainly could do. but is this the only way to do it?

I have the following problem:

• There are several classes with method generators, which needs to be compiled during every compilation
• I have "ckub" qualifiers enabled in studio
• I don't want to remove "u" qualifier because I need it very much in another namespaces

So how do I force classes with method generators to recompile when "u" qualifier is present?

Hi, Community!

Please share your experience on code deployment on production site. Do you compile ObjectScript on Production? Is it OK?

Or you only compile on Test site and copy cache.dat to a Production?

This is a translation of the following article. Thanks @Evgeny Shvarov for the help in translation.

Let's assume that you wrote a program that shows "Hello World!", for example:

  write "Hello, World!"

The program works and everyone is happy.

With time, however, your program becomes more complex, gets more features and you eventually need to show the same string in different languages. Moreover you don't know the number and names of these languages.

The spoiler below contains a description of how the task of multi-language localization is solved in Caché.

Hello everyone,

I'm trying to migrate the IDE for programming in COS, we normally use the Studio, but we want to use a more modern IDE. Our team has knowledge with Visual Studio plataform, but we couldn't configurate the compiler and terminal, I installed the extension InterSystems ObjectScript and tried to configurate to connect with my local machine, unfortunately the connection don't sucessed.

Someone has material for how i can connect and compile? Some material i saw show how to use the compiler, but not how can i do the configuration.

Here's my code (download):

Class Utils.Generators [ Abstract ]
{

ClassMethod B()
{
    s ^a = 1
}

ClassMethod A() [ CodeMode = objectgenerator, GenerateAfter = B, PlaceAfter = B ]
{
    k ^a
    do ..B()
}

Now, obviously for it to work I need method B compiled and ready to use before compiling method A().

I test it with the following code:

The attached file contains an example of code generation using ObjectGenerators which builds a very simple homemade RuleEngine.

Code generation is an excellent way of increasing performance moving run-time calculations to compile-time.

We could generate code creating routines or implemeting methods using ObjectGenerators. In this example we are using ObjectGenerators.

Update: Rule Engine is now on GitHub https://github.com/intersystems-ib/cache-iat-ruleengine

1.Background

1.1 I met a few project that their interface servers were crashed. Cutoms wanted resume server as fast as we can. their servers are running at lan,and they can't use git,there are some namesapce in the server running different service,and usualy there is only one server.

1.2 In the message,it has property in type of characterstream,as you know,the message search page doesn't support filtering with property of characterstream,so it's so hard to find the messge you want.

Hi -

I'm trying to create a method that will automatically create something I can save and use later, which will let me automate data migration from one version of a class to the next.

Hi all!

I'm developing a mini-framework to implement annotations in Cache. I want to support two kind of annotations: metadata and method decorators. I've got stuck trying to implement the second one.

Metadata

With metadata annotations I can add metadata to any kind of target. A target can be a method/classmethod, parameter, property and class.

For example:

Hi community.

I want to create a custom list inheriting %ListOfDatatypes in order to implement some methods like Map, Filter, ForEach, but I have some questions.
Just to mention, I have already read the topic about DeclarativeCOS.

When I define a property like following, caché uses %Collection.ListOfDT or %Collection.ListOfObj, as it's shown in the documentation