Japan's Largest E-Commerce System Development & Operation

Saturday, November 14, 2015

Implementing Agile Methodologies at Work

Objective:

to implement Agile Methodologies at work to provide more value to the end-users and empower the team.

Available Methodologies:

Scrum

Extream Programming(XP)

Lean Software Design

Kanban

References:

Software Product Management Specialization
https://www.coursera.org/specializations/product-management

JIRA Agile 101
https://confluence.atlassian.com/agile/jira-agile-101

transitioning to agile @ www.mountaingoatsoftware.com
https://www.mountaingoatsoftware.com/agile/transitioning-to-agile

Saturday, October 24, 2015

Safari Online : Learning DNS

Learning DNS

by Cricket Liu

Publisher: Infinite Skills

Release Date: July 2015

ISBN: 9781771373692

Running time: 1:58:14

Topic: Computer Networking

Safari Online URL:

https://www.safaribooksonline.com/library/view/learning-dns/9781771373692/

Book Review:

http://shop.oreilly.com/product/9780596100575.do

What You Can Learn

Well, you can learn all about the DNS including a big picture, details, and history with this course!
hands-on practice sessions are also included with "nslookup" and "dig" commands.

TODO

some concepts are not yet fully understood yet. so will come back at a later time and study a bit deeper.

local resolver configuration
local server list
reverse lookup
Advanced Topics (,Dynamic Update,NOTIFY,IXFR,Sender Policy Framework)

My Impression

overall this is a very very good course that you can learn all about the DNS.. this course is well constructed. so highly recommended for a beginner as well as an intermediate..

__END_OF_ENTRY__

Sunday, September 13, 2015

Dockerfile to build a Weblogic environment

Objective

Be able to set up an isolated environment for each developer to better develop/test applications.

Approach

Use a docker.

Background

In my team, there are a number of applications which run in a weblogic server. Unfortunately, we don't have a good development environment such as we can't run a application on a local machine.we only have a shared Stating environment to test. ( we don't have a DEV environment surprisingly!!!).

So In order to make a better development environment, I am testing a docker to tackle this issue..

Source URL

this is a working-dockerfile to build a weblogic environment.For details, please see my github repository here.. ( https://github.com/emoken/docker-study/tree/master/weblogic-environment ).

I also paste a working-dockerfile for review as of 2015/09/14(Mon) version.

	# ----------------------------------------------------
	# Dockerfile
	# ----------------------------------------------------
	#
	# This is a Weblogic environment.
	#
	# URL:
	# http://localhost:7001/console
	#
	# Environment Details:
	# OS = dedora:latest
	# see (https://hub.docker.com/_/fedora/) for the exact version.
	# Java = jdk-7u79
	# Weblogic = Weblogic 11g 10.3.6
	#
	# ----------------------------------------------------

	# Pull base image.
	FROM fedora:latest

	MAINTAINER emoken "https://github.com/emoken"

	# Update and install
	RUN [ "yum", "update", "-y" ]

	RUN [ "yum", "install", "unzip", "-y" ]
	RUN [ "yum", "install", "wget", "-y" ]
	RUN [ "yum", "install", "binutils.x86_64", "-y" ]
	RUN [ "yum", "install", "gcc.x86_64", "-y" ]
	RUN [ "yum", "install", "gcc-c++.x86_64", "-y" ]
	RUN [ "yum", "install", "glibc.x86_64", "-y" ]
	RUN [ "yum", "install", "glibc.i686", "-y" ]
	RUN [ "yum", "install", "glibc-devel.i686", "-y" ]
	RUN [ "yum", "install", "libaio.x86_64", "-y" ]
	RUN [ "yum", "install", "libaio-devel.x86_64", "-y" ]
	RUN [ "yum", "install", "libgcc.x86_64", "-y" ]
	RUN [ "yum", "install", "libstdc++.x86_64", "-y" ]
	RUN [ "yum", "install", "libstdc++.i686", "-y" ]
	RUN [ "yum", "install", "libstdc++-devel.x86_64", "-y" ]
	RUN [ "yum", "install", "libXext.i686", "-y" ]
	RUN [ "yum", "install", "libXtst.i686", "-y" ]
	RUN [ "yum", "install", "redhat-lsb-core.x86_64", "-y" ]
	RUN [ "yum", "install", "sysstat.x86_64", "-y" ]
	RUN [ "yum", "install", "tmux.x86_64", "-y" ]
	RUN [ "yum", "install", "vsftpd.x86_64", "-y" ]

	# ----------------------------------------------------
	# Install Java
	# ----------------------------------------------------
	#Create folder oracle
	RUN mkdir -p /u02/app/oracle/product

	#Work folder
	WORKDIR /u02/app/oracle/product

	#Add java to docker
	#ADD jdk-7u79-linux-x64.rpm ./jdk-7u79-linux-x64.rpm
	RUN wget https://dl.dropboxusercontent.com/u/10127753/jdk-7u79-linux-x64.rpm

	#Copy with sucess
	RUN echo "jdk copy sucess"
	RUN chmod +x jdk-7u79-linux-x64.rpm
	RUN ls -la /u02/app/oracle/product

	# Install Java.
	RUN rpm -Uvh jdk-7u79-linux-x64.rpm

	#Remove installer
	RUN rm -rf jdk-7u79-linux-x64.rpm

	# Define commonly used JAVA_HOME variable
	ENV JAVA_HOME /usr/lib/jvm/java-7-oracle

	# ----------------------------------------------------
	# Install Weblogic Server
	# ----------------------------------------------------
	# Actual Weblogic 11g 10.3.6 installation and setup procedures
	# Create a OFA location to put the weblogic install, create to oracle user so we can set the permissions on the location
	RUN groupadd dba -g 502 && \
	groupadd oinstall -g 501 && \
	useradd -m -u 501 -g oinstall -G dba -d /home/oracle -s /sbin/nologin -c "Oracle Account" oracle && \
	mkdir -p /u01/app/oracle && \
	chown -R oracle:oinstall /home/oracle && \
	chown -R oracle:oinstall /u01/app/oracle

	# Install Weblogic 11gR1 10.3.6 Generic
	ADD silent.xml /u01/app/oracle/silent.xml

	WORKDIR /u01/app/oracle/
	RUN wget https://dl.dropboxusercontent.com/u/10127753/wls1036_generic.jar

	# Set permission

	RUN chmod +x /u01/app/oracle/wls1036_generic.jar

	# Install
	RUN [ "java","-Dspace.detection=false", "-Xmx1024m", "-jar", "/u01/app/oracle/wls1036_generic.jar", "-mode=silent", "-silent_xml=/u01/app/oracle/silent.xml" ]
	RUN rm /u01/app/oracle/wls1036_generic.jar

	#USER oracle

	# ----------------------------------------------------
	# Install Weblogic Admin Server
	# ----------------------------------------------------
	USER root
	ADD basicWLSDomain_AdminServer.py /u01/app/oracle/product/fmw/wlserver_10.3/common/templates/scripts/wlst/

	RUN /bin/bash -c "source /u01/app/oracle/product/fmw/wlserver_10.3/server/bin/setWLSEnv.sh" \
	&& /u01/app/oracle/product/fmw/wlserver_10.3/common/bin/wlst.sh /u01/app/oracle/product/fmw/wlserver_10.3/common/templates/scripts/wlst/basicWLSDomain_AdminServer.py

	ADD change_weblogic_password.sh /u01/app/oracle/product/fmw/
	ADD entrypoint.sh /u01/app/oracle/product/fmw/

	RUN [ "chmod", "a+x", "/u01/app/oracle/product/fmw/change_weblogic_password.sh", "/u01/app/oracle/product/fmw/entrypoint.sh" ]

	ENTRYPOINT [ "/u01/app/oracle/product/fmw/entrypoint.sh", "AdminServer", "weblogic123" ]

	EXPOSE 7001
	EXPOSE 22

	# Define default command.
	CMD ["bash"]

view raw weblogic-environment_Dockerfile.txt hosted with ❤ by GitHub

Monday, September 7, 2015

Flood Fill : grafixMask – SRM 211 Div 1 from Topcoder

Here I was practicing the "Flood Fill" approach to solve a problem. For details, see below.

https://www.topcoder.com/community/data-science/data-science-tutorials/how-to-find-a-solution/#floodfill

Problem

This is the problem statement.
http://community.topcoder.com/stat?c=problem_statement&pm=2998&rd=5857

My Approach

Since this is a solvable problem with the "Flood Fill", I used BFS to search all reachable cells from every coordinate.

Here is my practice code at Github..

https://github.com/emoken/topcoder-study/blob/master/src/main/java/TopCoder/SRM211_DIV1/GrafixMask.java

	package TopCoder.SRM211_DIV1;

	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Collections;
	import java.util.LinkedList;
	import java.util.List;
	import java.util.Queue;

	public class GrafixMask {

	public int Y_MAX = 400;
	public int X_MAX = 600;

	boolean area[][] = null;

	public int[] sortedAreas(String[] rectangles) {

	area = new boolean[Y_MAX][X_MAX];
	int y = 0;
	int x = 0;

	// ---------
	// parsing
	// ---------
	for (String str : rectangles) {
	String[] strs = str.split(" ");

	int[] index = Arrays.asList(strs).stream().mapToInt(Integer::parseInt).toArray();
	for (y = index[0]; y <= index[2]; y++) {
	for (x = index[1]; x <= index[3]; x++) {
	area[y][x] = true;
	}
	}
	}

	// ---------
	// main
	// ---------
	List<Integer> result = new ArrayList<Integer>();

	for (y = 0; y < Y_MAX; y++) {
	for (x = 0; x < X_MAX; x++) {

	// if found a hall.
	if (!area[y][x]) {
	result.add(calcHoleArea(y, x));
	}
	}
	}

	Collections.sort(result);

	int[] finalResult = new int[result.size()];
	for (int i = 0; i < finalResult.length; i++) {
	finalResult[i] = result.get(i);
	}

	return finalResult;
	}

	Queue<CoordinatePair> q = new LinkedList<CoordinatePair>();

	private int calcHoleArea(int startY, int startX) {

	int y = startY;
	int x = startX;

	int cntArea = 0;
	q.add(new CoordinatePair(y, x));

	while (!q.isEmpty()) {

	CoordinatePair c = q.poll();
	y = c.y;
	x = c.x;

	if(area[y][x]) continue;

	area[y][x] = true;

	cntArea++;

	if ((x + 1) < X_MAX && !area[y][x + 1]) {
	q.add(new CoordinatePair(y, x + 1));
	}

	if ((x - 1) >= 0 && !area[y][x - 1]) {
	q.add(new CoordinatePair(y, x - 1));
	}

	if ((y + 1) < Y_MAX && !area[y + 1][x]) {
	q.add(new CoordinatePair(y + 1, x));
	}

	if ((y - 1) >= 0 && !area[y - 1][x]) {
	q.add(new CoordinatePair(y - 1, x));
	}

	}

	return cntArea;

	};

	class CoordinatePair {

	int x;
	int y;

	public CoordinatePair(int y, int x) {
	super();
	this.y = y;
	this.x = x;
	}
	}

	// Unit Testing.
	public static void main(String[] args) {

	GrafixMask thisObj = new GrafixMask();

	System.out.println(Arrays.toString(thisObj.sortedAreas(new String[] { "0 292 399 307" })));

	System.out.println(Arrays.toString(thisObj.sortedAreas(new String[]{"48 192 351 207", "48 392 351 407",
	"120 52 135 547", "260 52 275 547"})));

	System.out.println(Arrays.toString(thisObj.sortedAreas(new String[]{"0 192 399 207", "0 392 399 407",
	"120 0 135 599", "260 0 275 599"})));

	System.out.println(Arrays.toString(thisObj.sortedAreas(new String[]{"50 300 199 300", "201 300 350 300",
	"200 50 200 299", "200 301 200 550"})));

	System.out.println(Arrays.toString(thisObj.sortedAreas(new String[]{"0 20 399 20", "0 44 399 44", "0 68 399 68",
	"0 92 399 92",
	"0 116 399 116", "0 140 399 140", "0 164 399 164", "0 188 399 188",
	"0 212 399 212", "0 236 399 236", "0 260 399 260", "0 284 399 284",
	"0 308 399 308", "0 332 399 332", "0 356 399 356", "0 380 399 380",
	"0 404 399 404", "0 428 399 428", "0 452 399 452", "0 476 399 476",
	"0 500 399 500", "0 524 399 524", "0 548 399 548", "0 572 399 572",
	"0 596 399 596", "5 0 5 599", "21 0 21 599", "37 0 37 599",
	"53 0 53 599", "69 0 69 599", "85 0 85 599", "101 0 101 599",
	"117 0 117 599", "133 0 133 599", "149 0 149 599", "165 0 165 599",
	"181 0 181 599", "197 0 197 599", "213 0 213 599", "229 0 229 599",
	"245 0 245 599", "261 0 261 599", "277 0 277 599", "293 0 293 599",
	"309 0 309 599", "325 0 325 599", "341 0 341 599", "357 0 357 599",
	"373 0 373 599", "389 0 389 599"})));

	}


	}