JBoss Drools

JBoss/JBoss AS (JavaBeans Open Source Software Application Server)

- now has a new name WildFly
- is a J2EE platform for developing and deploying enterprise Java applications, Web applications and services, and portals

Drools/JBoss Rules

- a rule language
- case sensitive
- single line comments starts with # or //, multi-line comments are enclosed in /* and */

Rule file - file ending with .drl

jBPM

- is a flexible java Business Process Management (BPM) Suite
BPM makes the bridge between business analysts, developers and end users, by offering process management features and tools in a way that both business users and developers like it

Components of jBPM

• core process engine - the only required component
• history log
• human task service
• graphical editors
• eclipse plugin
• web-based designer
• Guvnor respository - can store all business processes
• jBPM console - web-based console for managinf business processes

http://docs.jboss.org/drools/release/5.2.0.Final/drools-expert-docs/html/index.html

Core

knowledge base
   - used to look up the process definitions whenever necessary
   - uses a knowledge builder to load processes from various resources (for example from the classpath, from file system or process repository), i.e.

KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("ruleflow.rf"), ResourceType.DRF);

   - can be dynamically changed (so you can add or remove processes at runtime)
session
   - instantiated from knowledge base and are used to execute processes and interact with the engine

Structure of a Rule File:

package package-name - must always be the first element
imports - optional, order does not matter
globals - optional, order does not matter, define global vars
functions - optional, order does not matter
function String hello(String name) {
    return "Hello "+name+"!";
}
queries - optional, order does not matter
rules - optional, order does not matter
rule "name"
    attributes
    when
        LHS
    then
        RHS
end

Common rule attributes: 

salience - priority, higher salience values are given higher priority, default is 0, can be positive or negative
agenda-group - a group name, only rules in the agenda group that has acquired the focus are allowed to fire
activation-group - same as if else, only one will fire

Ref:
http://docs.jboss.org/jbpm/v5.1/userguide/

Ant buildfile

Each buildfile contains one project and at least one (default) target. Targets contain task elements.

Basic components/tags:
1) project - attributes: name, default, and basedir

2) target - attributes: name, depends, if, unless, descriptiondefault, and basedir

3) tasks - can be built-in or user defined
Common tasks: init, sets properties, prepare, creates directories, build, builds the system, package, creates jar file, install, installs an application to Tomcat or other engine, deploy, deploy a WAR engine, reload, update previously installed application engine, redeploy

4) properties - to reference, enclose in "${" and "}"
Some Built-in Properties: basedir, ant.file, ant.version, ant.project.name, ant.java.version


Tags:
                     ...


Ref:
http://ant.apache.org/manual/using.html

Windows and Unix common commands

Windows	Unix	Description
attrib		change(clear or set) the attribute of the file
cd	pwd	print current working directory
cd <dir>	cd <dir>	change directory
cls	clear	clear screen
cmd		Starts a new instance of the Windows command interpreter
copy	cp	copy cp /mySrc .
date, time	date	print current date and/or time
del	rm	delete
deltree	rm - r	recursively delete entire directory tree
dir	ls	list files and directories ls attributes: -a Include hidden fiels (beginning with .) -l long format -s sort by time modified -r reverse sort
doskey /h	history	print history
edit	vi etc.	create new file, show edit window common vi commands: /<text> - search forward n - next occurrence ?<text> - search backward n - previous occurrence :set number - show line number :q | :quit | :q! - quit
exit	exit Ctrl-D	exit
	find	finds files/folders or string in files Ex. dir c:\ /s /b | find "CPU" - display the file names on drive C that contain the string "CPU" find . -name "foo*"
find	grep	search grep -n 'UnknownServiceException' */*/*/server.log grep -rni "string" * .* grep -E "a|b"   r = recursive i.e, search subdirectories within the current directory   n = to print the line numbers to stdout   i = case insensitive search   .* = hidden files/directory   -E = extended regex (i.e., may use | for or)
help	man	help/manual displays all available commands & how to use them
ipconfig /all	ipconfig -a	print network details
mkdir	mkdir	create new folder/directory
move	mv	move file or folder
rmdir	rmdir	remove folder/directory
set	env	set environment variable
set Path	echo $PATH	print value of environment var PATH
start		starting/opening a command/program List of commands for Windows XP, Vista and Windows 7: http://ss64.com/nt/run.html Ex. subst notepad start /d "C:\Program Files (x86)\Notepad++" notepad++.exe -> start the executable and close the command prompt that called it
subst		substituting path subst R: D:\temp\temp
type	cat	display contents of a file, concatenate files or create a new file Ex. cat > 1.txt This is the first line. - creates a simple text file. ^D mrks the end of file. cat 1.txt - display contents of 1.txt cat 1.txt 2.txt > 3.txt - concatenate 1.txt and 2.txt ans save it in 3.txt
tree	find ., ls -R	print directory structure
	less	display the contents of a text file on console
	ln	make link Types: 1. Hard link (default) - Points to a file through inode number. If the original file's name is changed, hard link still points to same file. 2. Symbolic link (ln -s) - Points to a file through name. If the original file's name is changed, symbolic link still points to the original name and does not point anymore to the original file. If the original file's content is changed, symbolic link still points to the same file. ln -s myFolder myShortcut - create ln -sfn myFolder2 myShortcut - update    -f = force    -n = treat LINK_NAME as a normal file if it is a symbolic link to a directory, else LINK_NAME  will be treated as symbolic link and will not effectively remove link to previous target and point to new target
	printenv	print environment variables
	tar	archive/extract tar -xvf sample.tar.gz

PATH

Windows	Unix	Description
\	/	Directory separator, e.g. C:\user\docs\sample.txt
/	-	Switch, e.g. dir /w
[drive letter:]\ or \\[server name]\[volume]\	/	Root directory
.	.	Current directory
..	..	Parent directory
	~	Home directory - $HOME var in UNIX, which usually is /home/username
C:\user\docs\sample.txt docs\sample.txt A:pic.jpg \\server01\user\docs\sample.txt	//home/user/docs/Letter.txt . /inthisdir ../../greatgrandparent ~/.rcinfotd>	Sample paths

Source:
https://en.wikipedia.org/wiki/Path_(computing)

Software Testing

Testing Levels

• Unit testing
• done in local/DEV
• testing fixes individually
• Integration testing
• done in SIT
• testing integrated modules
• deals with integration of a process in the system, not the integration of the whole system
• System testing
• done in SIT
• testing the system as a whole
• Types of system testing:
• Usability testing – this is how well the user can access the different features in the system and how easy it is to use.
• GUI software testing – this is to check if graphically that the program looks how was intended and the GUI works as intended.
• Security testing – this would be to check if important information is secure and if there are certain access restriction that they work.
• Accessibility – how easy is it for various users including users with disability to use the system.
• Reliability testing – to check that the system works for long period of time and does not constantly crash.
• User acceptance testing
• done in UAT
• obtain confirmation that a system meets mutually agreed-upon requirements

Outline: Warren Buffett's Management Secrets

by Mary Buffett and David Clark

Step 1. Pick the right business to work for (business that offers greatest career opportunities)

Chapter 1. how to find companies that offer greatest career opportunities (w/ durable competitive advantage)

have products that:
- never really change
- easy to sell
- own a piece of consumer's mind

come in 3 basic business models:
- sell unique product, e.g. Coca Cola, Hershey
- sell unique service, sell what people need
- low cost buyer and seller of product/service that the public is consistently in need of - offer low cost through high volum, e.g. Walmart, Costco, Burlington

Chapter 2. quick test for identifying the best company to work for 

- per share earnings test (10 year period) - consistent and has upward trend
- debt test - long term debt must be low, debt load should be < 5*net earnings
- gross margin test - must be higher
      gross profit = revenue - cost of good sold
      gross margin = gross profit/revenue

Step 2. Delegate

Chapter 3. rules for delegating authority 

- every business culture is unique
- leave managers alone - let them continue to think their business as their own
- managers must have a GREAT deal of INTEGRITY

Step 3. Find the right manager for the job

Chapter 4. where to start search for manager 

- change manager only when necessary
- promote from within if possible
- look for talent w/ proven talent record

Chapter 5. victor or victim

- must have an internal locus of control
- victor = with internal locus of control - in control of themselves, take responsibility for their failures
- victim = with external locus of control - don't believe that they have power to solve their problems

Chapter 6. work at a job you like

- do what you love/love what you do, must not be driven by money

Chapter 7. put a winning sales team together

- find people who believe in the product

Chapter 8. obsession

- sd

Useful Maven Commands

• mvn --version - displays the Maven version in use
• mvn dependency:tree - displays the dependency tree for this project
• mvn eclipse:eclipse - creates/updates Java eclipse project settings (.project, .classpath, .setting/org.eclipse.jdt.core.prefs, & other config files)
• mvn eclipse:clean - cleans/removes Java eclipse project settings (.project, .classpath, .setting/org.eclipse.jdt.core.prefs, & other config files)

Useful DB2 Queries

ALL TABLES:
select * from sysibm.systables

TABLE DESCRIPTION:
select * from sysibm.syscolumns where tbname = 'tableName'
- NOT VERY RELIABLE, SOME COLs MIGHT BE MISSING

or

select colname, typename, length, scale from syscat.columns
where tabschema = 'schemaName' and tabname = 'tableName'
- NOT VERY RELIABLE, SOME COLs MIGHT BE MISSING

or

describe table tableName - DOES NOT WORK :(

Note: Use SYSCAT views rather than the SYSIBM tables. Reason being is that from release to release the tables are being revised while DB2 development tries hard to keep the SYSCAT view signatures compatible. For this reason SYSCAT is being described in the SQL Reference while SYSIBM is not.

GET CURRENT DATE/TIME:
select current date from sysibm.sysdummy1
select current time from sysibm.sysdummy1
select current timestamp from sysibm.sysdummy1

Note: sysibm.sysdummy1 table is a special in-memory table that can be used to discover the value of DB2 registers

Sources:
http://www.databaseteam.org/9-db2/b4ac3f33bec9fb23.htm#.UfdJQ41OS6M
http://www.ibm.com/developerworks/data/library/techarticle/0211yip/0211yip3.html