New post
AllAccepted answers
Dmitry Maslennikov · Apr 10, 2019

Some time ago I did an example of Angular Application with IRIS on a backend.

Source for this project available on gitlab.

How to develop Angular application, you should look at angular documentation, and all about frontend development. There are some tools, which helps to develop and build your frontend side. Such as webpack, which do most of work related with build your sources to  production ready environment.

In my simple project, you need only docker, and any editor, preferable VSCode.

By command,  you will get a running server in development mode. So, you can edit Angular code, and IRIS code, and see an immediate result.

docker-compose up -d

And this project also deployable with Kubernetes. So, after any push of changes to gitlab, it will build, and test it.

node_modules, never goes to source control. It's enough to have package.json and package-lock.json there. node_modules may contain platform specific libraries.

Hope I will manage to write a complete article about this project, with all the details.

Dmitry Maslennikov · Apr 4, 2019

There is also ClassMethod GetGlobalSize in the class %Library.GlobalEdit , where you can select a fast way to count or not, and you will get a different result.

 ClassMethod GetGlobalSize(Directory As %String, GlobalName As %String, ByRef Allocated As %Integer, ByRef Used As %Integer, fast As %Boolean = 0) as %Status

Get size of this global
'Allocated' - total size, in MB, of blocks allocated for the global.
'Used' - total used data, in MB, for the global.
'fast' - TRUE : faster return, it won't return the value of 'Used'.
FALSE - slower return,, it returns values for both 'Allocated' and 'Used'.

So, when fast, it just counts blocks and don't care how those blocks fill by data and multiply the number of blocks on Size of the block.

Used, counts only when you pass fast=0, and it calculates exact size, and to be more accurate reads all blocks, so it could be slower.

Dmitry Maslennikov · Apr 3, 2019

Visual Studio and Visual Studio Code are two very different products but just with similar names.

To configure Visual Studio Code, you can use this settings

{
    "objectscript.conn": {
        "active": true,
        "host": "localhost",
        "port": 57772,
        "ns": "SAMPLES",
        "username": "admin",
        "password": "SYS"
    }
}

Where,

  • active, should be true, if you going to be connected
  • port should point to Web server port, and not super port
  • username/password, the user should have enough permissions with role %Development
Dmitry Maslennikov · Mar 27, 2019

I'm not an InterSystems guy and can say only from my point of view, how it works.

Every global name has internal representation in some kind of binary format, I don't know how it can be converted to and back. But this string used to find a correct block. Like when you looking for ^C(9996,46, yellow), it first should read Map (Block 3), to find where Global ^C started (Block 44), then using this internal format for global, it can find the closest node in the first pointer block if it points to another pointer block, the same search repeats until it reached any Data block, which may also contain data for multiple nodes. 

Not sure If I can better explain it, but most important is that B* tree helps to very quickly find the final block, and their neighbours. 

Dmitry Maslennikov · Mar 19, 2019

Look at this my article where you will find some details, how to build Cache in docker on centos.

Instead of COPY and tar I would recommend using ADD command because it doing extract at the same time.

And for doing such build, you should have file cache-2017.1.3.317.0.18571-lnxrhx64.tar.gz close to the Dockerfile, or in the root of build context.

If you do build this way. Cache distributive should be in the current folder.

docker build .

But, you will face an issue with Storage Driver. It will look like, successful build but PROTECT error during startup. With previous versions of Docker it was possible to change Storage driver to aufs, but not with the latest version, where support for such driver already removed. There are some tricks on how to manage to work with it, but I would not recommend it.

Nowadays only IRIS 2019.1 works quite well in Docker with the default storage driver out of the box.

Dmitry Maslennikov · Mar 8, 2019

If you would like to do it with %Installer Manifiest, it is not going to be easy, unfortunately. CSPApplication there quite limited.

I can't just do it this way.

<CSPApplication Url="${CSPApp}" Directory="${CSPAppDir}" iKnowEnabled="yes"/>

You should first create simple csp application

<CSPApplication Url="${CSPApp}" Directory="${CSPAppDir}"/>

Add something like this method

ClassMethod EnableiKnow(pCSPName As %String = "") As %Status
{
  new $namespace
  znspace "%SYS"
  set props("iKnowEnabled")=1
  d ##class(Security.Applications).Modify(pCSPName,.props)
  quit $$$OK
}

But unfortunately, I also can't just call it from an installer, Invoke tag should be placed in Namespace tag. which is actually current namespace, but you should compute it first. This may help to declare a couple more default variables. Just place two first lines before your Installer generator

  do %code.WriteLine($c(9)_"set pVars(""CURRENTCLASS"")="""_%classname_"""")
  do %code.WriteLine($c(9)_"set pVars(""CURRENTNS"")=$namespace")
  quit ##class(%Installer.Manifest).%Generate(%compiledclass, %code, "setup")

And finally, you can add this to your installer. Place it after CSPApplication creation, but outside of Namespace tag.

<Namespace Name="${CURRENTNS}">
    <Invoke Class="${CURRENTCLASS}" Method="EnableiKnow" CheckStatus="true">
      <Arg Value="${CSPAPP}"/>
    </Invoke>
  </Namespace>
Dmitry Maslennikov · Mar 6, 2019

I did not know about "%%UPDATE","%%INSERT". I decided to add an extra field

CREATE TABLE "test" (
  "identifier"   VARCHAR(200) NOT NULL,
  "value"        INTEGER
                 COMPUTECODE { Set {*}={*}+{increment} }
                 COMPUTEONCHANGE ("%%UPDATE","%%INSERT"),
  "increment"    INTEGER,
  PRIMARY KEY ("identifier")
)

and 

INSERT OR UPDATE INTO "test" ("identifier", "increment")
          VALUES ('someid', 1)

this solved my issue

Dmitry Maslennikov · Mar 2, 2019

I would not be so sure in your doubts about VSCode. VSCode itself supports refactoring staff, we just do not have it in ObjectScript extension, yet. Deleting obsolete classes, for sure very interesting and quite difficult task. But better to solve it another way, with just clean rebuild. Or for example I can add action delete in the context menu in server explorer, so, a developer will be able to manually delete any class/routine on the server from VSCode.