Re: What are micro-services?

Nice talk Niels.

Though I think some things are correct that they can be used the way they are described but are not requirements.

For example the use of JSON. A microservice does not require the data to be sent or received in JSON but the talk make it sound so.
And the part about the interface and entanglement " ... The Java program needs to know how the RPG are calling you. ...". In any service you have an interface and also with a microservice you can also have a very specific interface. And that is the case as long as an interface is not standardized. F. e. SOAP is standardized and REST has a more or less defacto standard. These two make good cases where you not necessarily need both parties (which is also due to the fact that you can make a good description of the service with the existing tooling , see OpenAPI and Swagger).

"It is a Java program that is actually running to encapsulate everything. You are not running on WebSphere or Tomcat servers or Apache." ... That is partly true. The Java program encapsulates all parts of the program ( though hopefully not the configuration). But you need some kind of web server if you want to have a web service. The thing is that you don't need one installed separately because the program comes with an embedded web server ( / servlet container, which is the same approach as other frameworks also use like dropwizard.io or bluedroplet). From the Spring Boot web site: "Features: Embed Tomcat, Jetty or Undertow directly"

I would also point out that these kind of microservices are good to be used when you need offer a service for clients which are not on the same machine. As long as it stays on the same machine I would use the program/serviceprogram directly via a prototype of the program/procedure.

But none the less ... great work Niels!

Mihael


On 24.07.2018 11:03, Niels Liisberg wrote:

I just made a little "pitch" about microservices and how it fits together
with IBM i - here:

http://ibmsystemsmag.com/ibmi/trends/italk-with-tuohy/niels-liisberg/

On Tue, Jul 24, 2018 at 10:50 AM Niels Liisberg <nli@xxxxxxxxxxxxxxxxx>
wrote:

I just made a little "pitch" about microservices and how it fits together
with IBM i - here:

http://ibmsystemsmag.com/ibmi/trends/italk-with-tuohy/niels-liisberg/


On Sun, Jul 22, 2018 at 11:47 PM Jack Woehr <
jwoehr@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:

See, I don't know the formal definitions, because I didn't need to be sold
on the idea.

I started out in the Forth community, and factoring was our credo!

On Sun, Jul 22, 2018 at 2:46 PM, Mihael Schmidt <mihael@xxxxxxxxxxxxxx>
wrote:

Microservice is often used as a buzzword. But it also actually has some
technical meaning.

And (even if you didn't say so but I want to make it clear that) the

term

microservice does not imply that it is a REST service or SOAP. Same as a
REST service does not need to use JSON as a data format.

Many people don't get the terms right and as many people on the IBM i
platform are not much into the technical stuff they don't really care.

My 2 cents.

Mihael



On 18.07.2018 02:32, Richard Schoen wrote:

Yep, just like I was creating HTTP URL based services to run remote
processing and return resulting data before the term web service or

REST

service ever came about and before XML and JSON were the thing.

Now they're called MicroServices. Yawn 😊

But it does sound cool !!

Regards,
Richard Schoen
Director of Document Management
e. richard.schoen@xxxxxxxxxxxxxxx
p. 952.486.6802 <(952)%20486-6802>
w. helpsystems.com

------------------------------

message: 4
date: Tue, 17 Jul 2018 16:14:02 -0500
from: Bradley Stone <bvstone@xxxxxxxxx>
subject: Re: What are micro-services?

I see them exactly as Google suggest.. small little applications that

do

certain things (figure tax, shipping, exchange rates, etc). Not the

best

examples, but all I could think of off hand.

I was doing (and still do) a similar thing, although local, with a lot

of

my web development years ago using a lot of Server Side Includes

(SSIs). I

say "local" because using SSIs you couldn't make requests outside of

your

domain. But each little piece of the web site was an SSI that did a
specific job (displayed the header, footer, user id, etc). Then

building

sites was as simple as popping SSIs (static or dynamic) into your table
design (now DIVs, though).

So I see micro services similar to that, only your requests can be made
anywhere to retrieve information. Maybe even down to something as

simple

as providing an image or js library to your application.

In other words, something we've been doing for a long time, and now

it's

just relabeled with a "cool" buzz word.. ;)

Bradley V. Stone
www.bvstools.com
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Best regards

Niels Liisberg
Chief Software Architect
System & Method A/S
Phone +45 70 20 30 10
Mobile + 45 31 15 88 61