Showing posts from March, 2017

Using LiteIde for Golang

I think LiteIde is definitely the editor to use for GoLang. Tried installing different plugins for vscode but unfortunately it is not so useful.

Go download and try LiteIde.

working with messages in mule

When using mule, it is very common to set and access variables, sessions variable and property along our flow. What are the differences between :-

a) variable - data that exist and last from start to end of a flow unless over-written. Accessed using #[flowVars]

c) session - a lasting location for storing values. Accessed by using #[sessionVars]

d) property - are message header information

e) message payload - is the mule message sent to user and move from flow to flow. It could made up of message inflow (accessed using #[message.inboundProperties] and message outflow #[message.outboundProperties].

f) message events

The best way to test this out is to create a flow that makes use of these basic mule construct.

Let's start off with variable. From the flow below we grab input from http and save it to a variable. Then we create a choice flow to see if the variable is "reece". If yes, branch up and set result to 111, else 222.

If we have a look at the "set variable"…

How CORS works in plain english?

CORS is used to control access to a remote resource, for example If we hosted a webpage on site, we can configure remote resource, and tell it should entertain request coming from

If you make a request from "" to, you will not be able to do so. Because we never really configure that to happen.

So we have, --> making GET request to -->

if is allowed requested to the site, we will  get some response that look like this.

 Request from

=> OPTIONS - HEADERS - Origin: Access-Control-Request-Method: GET Response from

<= HTTP/1.1 204 No Content - RESPONSE HEADERS - Access-Control-Allow-Methods: GET, POST, OPTIONS Access-Control-Max-Age: 86400 Access-Control-Allow-Headers: Api-Key Access-Control-Allow-Origin: Content-Length: 0 From here, we can see that "Access-Control-Allow…

Mule API Gateway vs Mule Runtime

Pretty confusing to me at first, as i would have thought mule Runtime host mule API Gateway. While that's definitely not the case, API Gateway connects with API Manager to enforce and apply policies / settings like throttling, security, CORS to your back end services. These enforcement are based on sa specific apps.

Mule Runtime is where all your application gets hosted and run. It takes incoming request, runs the specific flows and returns results.

Tutorial : Mule Creating a simplest flow using Http and Groovy component

In this example, we're going to create the simplest Mule app flow. Our flow basically consist of a Http and a Groovy component which looks like this :-

Using Groovy is optional and entirely up to developers to choose. If you're using it for simple and not so complicated task, then it is fine. Otherwise, Java gives you ability to debug through the code.
Groovy does give you direct access to message which you otherwise need to call getMessage() - [if you are to use java component ].

And here is our script looks like :-

User submits are request like this, http://localhost:3004/?username='jeremy'.

If it is jeremy, great, if not it returns invalid user.

For beginners, it's pretty hard to know what message property and types that are available.
Perhaps picture below would give a better way for newbies to work with mule in the future.

Tutorial : Mule Creating a simplest flow using Http and Java component

In this example, we're going to create the simplest Mule app flow. Our flow basically consist of a Http and a Java component which looks like this :-

User basically connects to something like this :- http://localhost:3003/?username=jeremy.

Query parameter called ussername get pass into java's class and returns "jeremy" or "unknow user" depending on the string passed.

Here is what our java class looks like :-

From the code above, our java class implements mule class callable and we attempted to extract username parameter from 'http.query.params' which is a Map object type. With this, we proceed to get our value by calling get Map's method 

Well, that's it. Done! :)

Mule - unit testing with munit getting dependencies right

Sometime trying to get the right dependencies for Mule Munit test can be a challenge. Not something  you wanna wrestle.

So here is a quick list of dependencies that you need.:-

Complete pom.xml configuration are given below :-

Could not find a declaration file for module 'react-redux'.

If you encounter this error, it is most likely that you don't have typings installed. All you have to do is run the following command and restart Vs Code

npm install --save @types/react-redux

force maven to re-download repository jar / dependencies

This happens alot in maven development. Somehow your repository has lost your .jar files and all you get is .lastupdate. To force it to redownload all these dependencies, you need to run the following command :-

mvn dependency:purge-local-repository

using mule cxf component

This is by far the coolest way to create a web service, using mule CXF. CXF is a component that allows you to easily create and expose a web service using Mule runtime.

Just create normal java interface and implements it. Cook up some Mule connector and you're good to publish your web service.

Lets create your interface.

Lets create your class. Notice we're not annotating it with @webservice.

Finish it up with the following Mule script :-

After this, we just have to consume this service and gets a return results.

setting response header connection to close

After some really time consuming effort to try to set header connection to "close" with WebAPI, i finally resorted to  good old all powerful nodejs.

Using the code below and fire away. It is able to accept incoming request from any port. Done! :)

using panda to find value matching certain criteria.

Say you have the following dataframe read into panda.

Id | F1    | F2      | Class
0  | True | True   | 0
0  | True | True   | 1
0  | True | True   | 0
0  | True | True   | 1

To select all the class with value 0 in a data frame, you can use

data.loc[data['Class'] == 0]

Class column name is case sensitive. You won't get anything out of using data['class'].

Easy to understand Confusing matrix link

Best link i have found to understand what is confusion matrix. This confusion matrix becomes not so confusing. :)

Mule Http Client Request logging

Best piece of logging i found - literally no code modification. Just add the following code in your log4j configuration file and all your logs will be revealed. :)

<AsyncLogger name="org.mule.module.http.internal.HttpMessageLogger" level="DEBUG" />
<AsyncLogger name="com.ning.http" level="DEBUG" />

Getting started with Credit Card Detection using xgBoost

One fine day i came across this article. Curiously wanted to see if this works, i found a way to quickly setup your machine to run it using docker. Yeap you can setup and run it in 30 minutes time.

All you have to do is install docker and run the following command

docker pull continuumio/anaconda docker run -i -t continuumio/anaconda /bin/bash This install anaconda with python 2.7. Don't worry about this version. Its all good plus xgboost works only on this version.

Additional library you might need to install are

conda install -c bioconda xgboost=0.6a2

conda install pyqt=4
After that, just run python and you can run all the command given in the article.

django serving static files

In order to serve static files, you need to configure  In this example, say we are hosting our static files under a folder called 'static' (and app) with a filename called index.html.

        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': ['static', 'app'],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [

And finally set your "" 
from django.conf.urls import url from django.views.generic.base import TemplateView
urlpatterns = [     #url(r'^$', views.index, name='index2…

adventureWorks unable attach to a SQL server

if you ever get an 'permission' issue trying to attach adventureWorks to your Sql Server, the solution would probably be this.

Right click on your 'adventureWorks.mdf' file -> Properties-> Security -> Give full control access.

That's it!

Golang Revel Web Framework for Windows installation

This is a guide to help setup Revel GoLang webframework on Windows.

So first thing you gotta do is install, golang here.

Next up, goto Revel website and follow

go get It will install to "C:\Users\DefaultUserFolder\go\bin". So please add this to your PATH manually instead of the installation folder which is C:\Go. 

When you run the command above, you most likely don't need to run :- go build or go install.

Time to go! :)

php with local server

Just type the following command and we're god to go :

php -S localhost:8080

Running XGBoost with R Studio

Let's say we are trying to use xgboost to make prediction about our data and here is a sample data that we're going to be using :-

Some terminology before moving on. R uses the term label to say, this is our expected output when we're building our model. Yes, it is really confusing. A label to becomes final output of our predictions.

Basically what we're trying to find is relation between smoking and high sugar intake will lead to a person having disease.  These are fake data of course.  There are people who smokes and eat as much choc as they like,  they still look sharp. (not me tho)

First we will create these data using R. Code example shows we're loading some libraries and then create a data frame called  'a'. Next it convert 'a' into a data table 'd'.

require(xgboost) require(Matrix) require(data.table) if (!require('vcd')) install.packages('vcd') a = data.frame(id=c(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17, 18, 19…

bootstrap grid system col-sm-offset

Regardless of what, that offset is to say "hey, leave some gaps/space" for me. For example, say we have a grid of col-sm-10 and i specify col-sm-offset-2, that gives me something like a full grid with 2 2 column is reserved for spacing.

This is a good way to see this would be looking at example below :-

Was abit confusing, initially but I guess offset would have been ok.

Running R code on the web

Definitely a good thing to have when learning R. Here you can run R code online.

git reverse commit is great.....

I found myself looking at a long list of commits which i need to remove. So i fire up my SourceTree and zoom in on list of commits that i need to undo. Right click on it and choose reverse commit. All the check-ins for that commit is gone.

That's it. :)

network file copy using python

The power of python and shutil that comes with copyfile and allows you to do network filecopy.

Check out the code here and yeap it is that simple :-

Outlook doesn't support css list-item disc or simply bullet

Tried incorporating bullet disc in an HTML Email attachment and didn't show anything in Outlook. :(
Guess the only solution is to have disc as embedded attachments.

php final keyword to make your class rock solid and can't be extended

This is a feature that i didn't know exist in PHP. Final keyword.