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Mars outline

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Below are some outlines of the evolution in Mars starting in 2024

1. People will go to explore
2. People will go to make science
3. If there is people you need places for the them to stay and food
4.The more people, the more business
4.1 Mining – Iron and stuff
5. People will use it to make exploratory research
6. The amount of people grow more ideas of jobs
7. The data flow (Earth – Mars) will increase
7.1 Satelites, cables, stuff will grow
8. Data centers/Data storages will be created in Mars, the bigger than Earth
8.1 People will realize that mining is not enough, they will start to make products on mars and ship to earth.
8.2 Mars gravity is smaller, therefore is easier to make a rocket there and send to other planets
9. High demanding jobs for technicians will be created
10. Mars becomes a pole for deep space technology
11. Number of people on mars reaches 50mi, Mars is the richest nation and request a formal separation from earth
12. As a separate entity more services and people will come
13. The nations on Earth create similar nations on Mars
14. Creation of MUN – Mars United Nations

Jboss

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Intro

I also do some stuff in Java, and it’s quite powerful and reliable still. Take Jboss for example, deployment is very straightforward and everything pretty much automatic, like deploying in Django/Flask, which I already told about it.

Jboss Deployment

After installation, the deployment is done just by copying the .war file to the standalone application directory. The run the standalone application just run the batch /bin/standalone.sh nothing more.

Jboss logs

One very important thing about JBoss is the console messages that appear on the log message since they are pretty human readable and therefore give the complete path of what is happening beneath the application. The logs below describe the deployment, undeployment of a standalone applicatin called example.war.

16:12:11,764 INFO [org.jboss.as.server.deployment] (MSC service thread 1-3) WFLYSRV0027: Starting deployment of “example.war” (runtime-name: “example.war”)
16:12:12,098 INFO [org.infinispan.factories.GlobalComponentRegistry] (MSC service thread 1-4) ISPN000128: Infinispan version: Infinispan ‘Chakra’ 8.2.8.Final-redhat-1
16:12:12,349 INFO [org.jboss.as.clustering.infinispan] (ServerService Thread Pool — 62) WFLYCLINF0002: Started client-mappings cache from ejb container
16:12:12,458 INFO [org.wildfly.extension.undertow] (ServerService Thread Pool — 67) WFLYUT0021: Registered web context: ‘/example’ for server ‘default-server’
16:12:12,503 INFO [org.jboss.as.server] (DeploymentScanner-threads – 1) WFLYSRV0010: Deployed “example.war” (runtime-name : “example.war”)
16:58:49,448 INFO [org.wildfly.extension.undertow] (ServerService Thread Pool — 67) WFLYUT0022: Unregistered web context: ‘/example’ from server ‘default-server’
16:58:49,466 INFO [org.jboss.as.server.deployment] (MSC service thread 1-3) WFLYSRV0028: Stopped deployment example.war (runtime-name: example.war) in 23ms
16:58:49,481 INFO [org.jboss.as.repository] (DeploymentScanner-threads – 1) WFLYDR0002: Content removed from location /home/fdemeloj/EAP-7.1.0/standalone/data/content/cb/e0a3a1e144bf6d37dba6cba8ccbc46000fef39/content
16:58:49,482 INFO [org.jboss.as.server] (DeploymentScanner-threads – 1) WFLYSRV0009: Undeployed “example.war” (runtime-name: “example.war”)

REFs

[1] https://www.youtube.com/watch?v=jP0g6vLeMDQ

 

Java Garbage collector strategies

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Intro

I was reading recently about Gargabe collection in Java and I came to find Plumbr company their blogs about this theme. I came to this book [1]. The info I summarized below is basically from that source and others [2][3]. This is the first article about this topic and introduces the main concepts.

Garbage Collector – GC

Very well known, the garbage collector is the automated tool used for reclamation of unused memory eliminating. Such automation is called Garbage Collection. 

The so well debated Garbage Collector is one of those things that make Java such a special language actually.

Fragmenting and Compacting

If we eliminate the objects, considering that they are randomly distributed, the after fragmenting, it’s also an interesting thing to compact the memory. This process actually takes time and requires

Young and Tenured (Old)

The distribution of objects is done according to the time of creation/assignment time and by classifying those objects we pretty much get a complete and accurate picture about the objects, in a screenshot.

Stop The World pause

Basically is when the application is temporarily paused so the GC can do its complete work and clean the objects, but since they keep changing, we need to pause the application and take a screenshot of the application so the GC can delete real objects.

GC Algorithms

There are many algorithms that can be used in the GC that take different approaches for young and tenured objects, in other words, we can delete those objects using different ways.

REFs

[1]https://downloads.plumbr.io/Plumbr%20Handbook%20Java%20Garbage%20Collection.pdf

 

 

Scrum Evalution Form

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Intro

Together with Gabriel A., we are working in a Scrum Evaluation paper and therefore we would like to take your time, about 5 min, to evaluate some practices in Scrum methodology.

It’s a very simple Google form and we will use the information wisely. If possible we would like to ask for some comments too, if it’s not much to ask actually.

Obv// please speak the truth, not what your boss would like to hear – two different things sometimes.

Form

 

Repl.it

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Intro

I usually use Repl.it for quick prototyping some stuff, it’s very clean and although I couldn’t find any other mention of this online framework, ie. Online IDE, I think it’s quite interesting and I talked several times about it here.

Those are some interesting features that I’d like to highlight:

Repl.it

It’s an online IDE for development in several languages

Learn and teach

There are courses with assignments and all. Quite cool, I’m doing a course there.

Multiple languages

Well, the possibility to use several languages, including python2.7 and python3 is quite interesting.

Conversations

Not that much used, the possibility to post some questions online is very interesting. Although most often the questions that arrive while developing are googleable, once in a while there are more architecture questions.

Multiplayer

I think it’s one of the most powerful features of Repl.it and allows someone to code with someone else.  I recently started to develop a project with a colleague and it was quite intersting.

REFs

[1] https://repl.it/repls

Flask Framework

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Intro

I’m a Django guy, well, at least a bit. More python than Django, as some people say. But recently I started to play with Flask[1], quite simple and very appropriate for building small reliable api’s.

Flask

Several tutorials online can be found, the one I really like is this [2], Miguel Grinberg is quite didatict and explains the practical part very well.

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello World!"

Example

I did an small example with Flask and Google API connection and it’s on my git.

 

Tips

1. For releasing the API not in localhost, please change the last line:

app.run(debug) --> app.run(host='0.0.0.0')

2. Use POSTMAN to do the tests and export the tests as collections

3. You can use a AWS or Google Cloud/Azure for the tests. Google is pretty nice actually, AWS too.

4. Be patience cause it might happen a little delay on the deployment in the instances.

REFs

[1] http://flask.pocoo.org

[2] https://blog.miguelgrinberg.com/post/designing-a-restful-api-with-python-and-flask

[3] https://github.com/FranciscoMeloJr/Python-Tests