Tech Review: Wednesday, November 16, 2010

FalconView

Where is the FalconView log file?

• http://www.falconview.org/trac/FalconView/wiki/ILayerEditor
• in the users app data directory
• %APPDATA%
• C:\Users\<my user>\AppData\Roaming

Xen

http://en.wikipedia.org/wiki/Xen

• virtual-machine monitor
• linux
• Microsoft Windows

SIMH

• running VAX/VMS under Linux

VM

http://en.wikipedia.org/wiki/Virtual_machine

• a completely isolated guest operating system installation within a normal host operating system.

Geospatial

http://en.wikipedia.org/wiki/GDAL

• Geospatial Data Abstraction Library (GDAL)
• a library for reading and writing raster geospatial data formats.

http://www.gdal.org/ogr/

• http://www.gdal.org/
• Geospatial Data Abstraction Library
• translator library for raster geospatial data formats
• http://www.w3.org/Mobile/posdep/GMLIntroduction.html
• introduction
• OGR - Simple Features Library in C++ 
• Opensource
• library
• commandline tools

http://www.falconview.org/svn/FalconView/trunk/public/third_party/gdal/Release/html/drv_gml.html

• GML in FalconView
• OGR has limited support for GML reading and writing
• Update of existing files not supported

http://www.gis.com/content/what-gis

• GIS (Geographic Information System)

http://tec.army.mil/gis/

• GIS Internet Resources

http://en.wikipedia.org/wiki/Geography_Markup_Language

• Georaphy Markup Language (GML) is a XML grammer defined by the Open Geospatial Consortium (OGC)

http://www.snowflakesoftware.co.uk/products/gmlviewer/index.htm

• Snowflake GML viewer
• GML Sample Data
• http://www.snowflakesoftware.com/products/gmlviewer/gmlSampleData.htm

FLOSS

What is FLOSS?

• http://en.wikipedia.org/wiki/Free_and_open_source_software
• Free and open-source software (FOSS) or fre/libre/open-source software (FLOSS)
• free - copy and re-use of software
• open-source software - strengths of peer-to-peer development model

ArcGIS

ArcGIS Data Export

• http://courses.washington.edu/gis250/lessons/data_export/index.html

Java

The initial value of class member variables.

• http://www.janeg.ca/scjp/lang/defaults.html
• false
• 0
• null

Android Development

http://brunocosta.com/blog/2011/11/02/speeding-up-android-development-with-android-x86-and-virtualbox/

• use Android-x86 and VirtualBox

Internet Anonymity

http://how-to.linuxcareer.com/i2p-anonymity-for-the-masses

• I2P
• Make it hard for the site you visit to get you info

Geospatial Platform

http://www.geoplatform.gov/home/

• Government shares with public

http://gcn.com/articles/2011/11/14/geospatial-platform-data-maps-apps.aspx?s=gcndaily_161111

• article about

Linux and Supercomputers

http://www.zdnet.com/blog/open-source/where-linux-crushes-windows-like-a-bug-supercomputers/9890?alertspromo=&tag=nl.rSINGLE

• 91.4% of the top 500 supercomputers are running Linux

OpenStack

http://www.openstack.org/

• opensource software for building private and public clouds
• consists of 3 parts
• computer
• object storage
• image service

http://www.rackspace.com/cloud/private_edition/openstack/

• private company RackSpace that uses OpenStack

Late Software Projects

http://www.computer.org/portal/web/computingnow/1111/whatsnew/software?utm_source=bronto&utm_medium=email&utm_term=all+late+projects+are+the+same&utm_content=hughes.stan%40gmail.com&utm_campaign=CN+November+16%2C+2011

• All software projects are late because they started late
• The started late for 3 reasons
1. no one started until the competition proved it doable or desirable
2. cost a lot more then anyone was willing to pay
3. no one knew that it needed to be done until the window of opportunity was closing
• usually a disguise for reason one or two

Tech Review Notes: Friday, November 11, 2011

Shape Collection Files (Falconview)

• http://www.falconview.org:8080/svn/FalconView/trunk/public/Applications/FalconView/overlay/FctryList.cpp

C# and FalconView

• http://www.falconview.org/trac/FalconView/wiki/MapRenderingEngine
• http://www.falconview.org/trac/FalconView/wiki/RenderEngineCodeSample

AMRDEC (Aviation & Missile Research, Development & Engineering Center)

• http://www.redstone.army.mil/amrdec/Business/index.html

ViewSonic

• http://www.tigerdirect.com/applications/searchtools/item-Details.asp?EdpNo=782735&sku=V18-0028
• $150
• Andriod 2.2
• 7"
• can be rooted
• http://bestcomputertablet.com/viewbook-vb730-7inch-tablet-android-2-2.html
• http://www.androidtablets.net/forum/viewsonic-tablets/25166-viewsonic-viewbook-730-a-2.html

Repast Simphony Graphics Tutorial

• Documentation
• http://repast.sourceforge.net/docs/docs_main.html
• Selfstudy
• http://www2.econ.iastate.edu/tesfatsi/repastsg.htm
• RepastJ
• Repast Simphony "no-GUI" Tutorial
• http://portal.ncess.ac.uk/access/content/group/mass/SimphonyTutorialImages/repastTutorial.pdf
• EMCAS Agent-Based Architectures
• http://www.mcs.anl.gov/~leyffer/listn/slides-06/MacalNorth.pdf
• Repast Simphony Continuous Space
• http://repast.sourceforge.net/docs/reference/SIM/Continuous%20Space%20Projection.html
• Class DisplayOGL2d
• http://repast.sourceforge.net/docs/api/repastjava/repast/simphony/visualizationOGL2D/DisplayOGL2D.html
• Interface ProjectionListener (Repast Simphony 2d projection)
• http://repast.sourceforge.net/docs/api/repastjava/repast/simphony/space/projection/class-use/ProjectionListener.html
• http://repast.sourceforge.net/docs/api/repastjava/repast/simphony/space/projection/class-use/ProjectionListener.html#repast.simphony.visualization.visualization2D
• Repast MouseTrap (Example of 2D Custom Display Code)
• http://repast.sourceforge.net/docs/TrapInitializer.java
• http://repast.sourceforge.net/docs/api/repastjava/repast/simphony/demo/mousetrap/TrapInitializer.html
• http://repast.sourceforge.net/docs/CustomDisplay.java
• Repast Simphony FAQ
• http://repast.sourceforge.net/docs/RepastSimphonyFAQ.pdf

Java Encryption Wizard

Not a self contain application.  I takes the file you drop into it and encrypts them.  You have to have the app and the encrypted file together.  Will not work with a 'headless' Java JRE.

Part of Software Protection Initiative

• http://www.spi.dod.mil/index.htm

Download and Instructions

• http://www.spi.dod.mil/ewizard_down.htm

Which Version of Ubuntu am I running?  Which Version of Linux am I Running?

For Ubuntu:

• $ cat /etc/issue
• http://www.howtogeek.com/howto/ubuntu/how-to-tell-what-version-of-ubuntu-you-are-running/

Installing OpenSSH Server

• https://help.ubuntu.com/8.04/serverguide/C/openssh-server.html
• sudo apt-get install openssh-server

What is BDI? (Belief-Desire-Intention)

• http://en.wikipedia.org/wiki/Belief-Desire-Intention_software_model
• lack specific mechanisms for to learn from past behavior
• http://ceur-ws.org/Vol-204/D02.pdf
• PRACTIONIST
• uses JADE and Prolog

Tech Review: Thursday, November 10, 2011

• 
  

http://en.wikipedia.org/wiki/Hibernate_(Java)

• an object-relational mapping (ORM) library for Java
• provides a object-oriented domain model mapping to a traditional relational database
• free GNU software
• http://en.wikipedia.org/wiki/NHibernate
• NHibernate for MS .NET

http://www.javaworld.com/javaworld/jw-10-2004/jw-1018-hibernate.html

• example program in Java

http://en.wikipedia.org/wiki/Red_Hat_Linux

• Red Hat Linux
• Discontinued in 2004

http://en.wikipedia.org/wiki/Red_Hat_Enterprise_Linux

• Read Hat Enterprise Linux (RHEL)
• Advance Platform (AS)
• Red Hat Enterprise Linux 3 (Taroon) Update 9, 2007
• outside of regular life cycle
• 2013-10-31 (End of Extended Life Cycle
• Red Hat Enterprise Linux 6 
• 2010-11-10
• 2017-11-30 (End of Regular Life Cycle)

Java Review: Tuesday, October 12, 2011

Java Run-time Exceptions

http://download.oracle.com/javase/1.4.2/docs/api/java/lang/IllegalStateException.html

• Class IllegalStateException
• example
• throw new IllegalStateException();
• use to catch programming development errors.
• exception should never occur unless there is a programming error.

http://download.oracle.com/javase/tutorial/essential/exceptions/throwing.html

• tutorial

http://download.oracle.com/javase/1.4.2/docs/api/java/lang/RuntimeException.html

• Class RuntimeException
• not checked
• not extra code
• danger of being a 'lazy programmer'

http://download.oracle.com/javase/tutorial/essential/exceptions/runtime.html

• can use to side step catch and specify requirements
• Runtime exceptions represent problems that are the result of programming problems
• If the client can reasonable be expected to recover from an exception, make it a checked exception

Garbage Collection in Java VMs

http://terracotta.org/products/bigmemory?asrc=eliminate-java-gc-tuning-2-gc-sno&gclid=CKzY28G346sCFcPt7Qod4kU9Rg

• Big memory
• works with
• JVMs
• HotSpot
• IBM JDK
• JRockit
• what about Dalvik?
• off-heap store
• not subject to Java GC
• Terracotta's tiered cache
• Enterprise Ehcache
• store up to a terabyte in the off-heap

http://www.koushikdutta.com/2009/01/dalvik-vs-mono.html

• Dalvik vs Mono

http://stackoverflow.com/questions/3078301/dalvik-memory-allocation-how-to-change-the-default-limits

• heap-limits set by OEM with Dalvik

http://pallergabor.uw.hu/androidblog/dalvik_opcodes.html

• Dalvik opcodes

http://mylifewithandroid.blogspot.com/2008/12/dalvik-opcodes.html

• DEX file format

http://mylifewithandroid.blogspot.com/2009/12/understanding-dalvik-bytecode-with.html

• Dalvik bytecode and Dedexer tool

http://en.wikipedia.org/wiki/Java_Virtual_Machine

• overview of Java VM

http://ryanolson.wordpress.com/2010/07/13/test-how-changing-the-max-amount-of-memory-per-vm-heap-can-effect-your-rom-cyanogen/

• Cyanogen allow Dalvik VM settings to be modified

http://blog.javia.org/android-allocation-free-code-avoids-the-gc-freeze/

• allocation-free code to avoid GC freeze

http://developer.android.com/guide/practices/design/performance.html

• Android, designing from performance

http://www.xinotes.org/notes/note/1449/

• heap size can be change in 'dx'
• example of changing

http://stackoverflow.com/questions/2298784/determine-when-the-android-gc-runs

• code to see the android GC run

http://stackoverflow.com/questions/1521317/is-it-possible-to-call-gc-in-android

• requesting GC
• System.gc();
• no guarantee it will run

Java Constants and Conditional Compile

http://www.javaworld.com/javaworld/javatips/jw-javatip5.html

• No textual preprocessor
• constants and conditional compilation
• use public static final boolean constant for  a regular if statement in regular code
• Have class using the constant interface implement the constant interface

Tech Review: Monday, October 10, 2011

C# null-coalescing operator

http://msdn.microsoft.com/en-us/library/ms173224.aspx

• From C# Reference for VS 2010
• example
• int? x = null;
• int y = x ?? -1;
• string s = null;
• Console.WriteLine (s ?? "Unspecified");
• used to define a default value for a nullable value type
• it returns the left-hand operand if it is not null; otherwise it returns the right operand

http://msdn.microsoft.com/en-us/library/1t3y8s4s.aspx

• more example from C# Programming Guide for VS 2010

http://stackoverflow.com/questions/278703/unique-ways-to-use-the-null-coalescing-operator

• not in Java, but some would like to add the feature

http://blog.joda.org/2009/01/java-7-null-default-and-null-safe_7527.html

• more about not in Java

http://www.merriam-webster.com/dictionary/coalescing

• coalescing mean "to grow together"
• does this sound like a good description of what the operator is doing?

Regions in Java

I know the above picture is not about 'Regions in Java' code, but it looked nice.

http://stackoverflow.com/questions/2344524/java-equivalent-to-region-in-c

• Basically, there are no region pre-compiler directives in Java
• There is support in some IDEs
• NetBeans
• // <editor-fold defaultstate="collapsed" desc="Your Fold Comment">
• ...
• // <editor-fold>
• Eclipse
• does it automatically for methods, imports, etc.
• Not declaration like in NetBeans
• Could you add one?
• Emacs?

Velocity Android 2.0 Internet Table 7" $100

http://www.tigerdirect.com/applications/searchtools/item-Details.asp?EdpNo=7188918&sku=V266-3032

• almost what I want
• missing the camera
• Multi touch capacitive screen

Viewsonic gTablet 10.1" Android 2.2:  $270

http://www.tigerdirect.com/applications/searchtools/item-Details.asp?EdpNo=7212231&sku=V18-0020

• This is what I want except the price and Android version

Simple C# Program

http://www.csharp-station.com/Tutorials/Lesson01.aspx

• the main routine starts with a Capital 'M' in C#
• starts with a lower case 'm' in Java

Listeners and Events (Actions) in Java

http://download.oracle.com/javase/tutorial/uiswing/events/index.html

• lesson on writing event listeners

http://download.oracle.com/javase/tutorial/uiswing/events/intro.html

• action listener
• public class Beeper ... implements ActionListener {
• adding an action listener to something
• button.addActionLisener ( new Beeper() )
• implement the method that does the action
• public void actionPerformed (ActionEvent e) {

http://download.oracle.com/javase/tutorial/uiswing/examples/events/BeeperProject/src/events/Beeper.java

• complete Beeper example

Java Color Map

http://www.ee.columbia.edu/~ronw/code/MEAPsoft/doc/html/ColorMap_8java-source.html

• color map in java
• Copyright
• Carnegie Mellon
• Sun
• Mitsubishi

Java List Interface and ArrayList Class

http://download.oracle.com/javase/6/docs/api/java/util/List.html

• Interface List <E>

http://download.oracle.com/javase/6/docs/api/java/util/ArrayList.html

• Class ArrayList<E>
• Example
• List list = Collections.synchronizedList (new ArrayList(...));

Java Collection Interface and Collections Class

http://download.oracle.com/javase/1,5.0/docs/api/java/util/Collection.html

• Interface Collection<E>

http://download.oracle.com/javase/1.4.2/docs/api/java/util/Collections.html

• static void sort (List list)
• reverse (List list)

Java Queue Interface and PriorityQueue Class

http://en.wikipedia.org/wiki/Queue_(abstract_data_type)

• new elements are put (enqueued) on the back of the queue
• element are pulled (dequeued) from the front of the queue
• First In First Out (FIFO)

http://download.oracle.com/javase/1,5.0/docs/api/java/util/Queue.html

• Interface Queue<E>
• offer (E o) // enqueue
• adds an element to the tail of the queue
• poll () // dequeue
• returns a removed element from the queue
• null is empty

http://download.oracle.com/javase/1,5.0/docs/api/java/util/PriorityQueue.html

• Class PriorityQueue<E>
• boolean add (E o)
• boolean offer (E o)
• E poll ()

Java Map Interface and HashMap Class

http://download.oracle.com/javase/tutorial/collections/interfaces/map.html

• tutorial

http://download.oracle.com/javase/6/docs/api/java/util/Map.html

• Interface Map<K,V>
• V put (K key, V value)
• V get (Object key)

http://download.oracle.com/javase/6/docs/api/java/util/HashMap.html

• Class HashMap<K,V>
• Example:
• Map m = Collections.synchronizedMap (new HashMap (...));

Chrome Remote Desktop

https://chrome.google.com/webstore/detail/gbchcmhmhahfdphkhkmpfmihenigjmpp

• BETA
• allow users to remotely access another computer through the Chrome browser or Chromebook
• An add on
• can easily miss the Icon after installation 

Tech Review: Wednesday, September 21, 2011

Working with porting C# to Java today.

Example of Java enums:  http://javahowto.blogspot.com/2008/04/java-enum-examples.html

• It is sort of like a class because you can override method inside the enum.
• @Override public String toString() {....}

Struct like objects in Java:  

• http://stackoverflow.com/questions/36701/struct-like-objects-in-java
• http://www.javacamp.org/javavscsharp/struct.html
• Java doesn't have structs
• in C# structs are:
• sealed (final)
• lightweight
• a value type, not a reference type (Object)
• more efficient than classes

Java vs. C# page: http://www.javacamp.org/javavscsharp/

• Has lots of really nice and clear comparisons.
• I need to read the whole thing

Benefits of using Final classes in Java:  http://www.java-tips.org/blog/java-se/benefits-of-using-final-class.html

• Control
• no one can inherit 
• final methods run faster than normal methods
• Java compiler may be able to inline a final method
• this link is suppose to dispute that
• http://www.ibm.com/developerworks/java/library/j-jtp1029.html
• 
  

Ternary or conditional operator in Java:  http://www.janeg.ca/scjp/oper/ternary.html

• operand1 ? operand2 : operand3;
• operand1 must be a boolean value or experssion

Operator overloading in Java:  http://stackoverflow.com/questions/77718/java-operator-overload

• program cannot overload operator like '+' or '-'
• http://www.velocityreviews.com/forums/t141181-operator-overloading-in-java.html
• JFront will take overload code and convert it to something Java can compile
• http://www.gginc.biz/jfront/index.html

The C# dictionary is similar to the Java Map interface:  

• http://download.oracle.com/javase/1.4.2/docs/api/java/util/Dictionary.html
• http://stackoverflow.com/questions/687942/java-map-equivalent-in-c
• Show going from Java Map to C# dictionary 
• description of Map interface
• http://download.oracle.com/javase/tutorial/collections/interfaces/map.html

The ArrayList Generic Class in Java:

• http://download.oracle.com/javase/6/docs/api/java/util/ArrayList.html
• Implements in List interface along with others
• not synchronized
• has an example of how to synchronize an ArrayList object

The C# ICollection interface:

• http://msdn.microsoft.com/en-us/library/92t2ye13.aspx
• seems similar to function of the Java Collection interface
• http://download.oracle.com/javase/6/docs/api/java/util/Collection.html

Another C#/Java comparison:  http://www.25hoursaday.com/CsharpVsJava.html#collections

A Java tutorial on collection interfaces:  

• http://download.oracle.com/javase/tutorial/collections/interfaces/
• http://download.oracle.com/javase/tutorial/collections/
• top of tutorial for collections

Today I was confused as to why code would compile in my simple command line program and not in Eclipse.

• Sometimes the error messages in Eclipse are miss leading
• I was trying to write code in the class body outside a method

Some examples of testing for null:  http://www.daniweb.com/software-development/java/threads/156111

• if (child == null) child = new Lista(c, null);

A tutorial on Eclipse:

• http://www.vogella.de/articles/Eclipse/article.html
• perspectives
• a visual container for a set of view and editors
• java
• debug
• C++?
• view and editors are grouped into
• views
• editors
• projects
• located in workspace
• workspace
• physical location of projects
• I thing Eclipse is more complex for many things that NetBeans.
• It's really an SDK, rather than an IDE (NetBeans)
• Seeing the error can be a pain in the neck
• http://stackoverflow.com/questions/1671115/how-to-detect-eclipse-compile-errors-java-jdt
• http://stackoverflow.com/questions/585642/eclipse-3-4-1-how-to-view-compiler-output-in-console-while-building-a-project
• The Eclipse JDT provides its own build-in Java compiler
• tightly integrated with Eclipse and JDT (Java Development Tools)
• http://www.eclipse.org/jdt/
• problems clearing 'Problems' window:  http://stackoverflow.com/questions/2385402/eclipse-cdt-how-to-clear-problems-window-without-invoking-clean-project-or-build
• tried what was recommended, but it didn't work
• no good solution given

Comparing Java and C# Generics:  http://www.jprl.com/Blog/archive/development/2007/Aug-31.html

Java Properties and C# properties are not the same thing at all:  http://download.oracle.com/javase/1.4.2/docs/api/java/util/Properties.html

• C# properties are a value in the object
• Java properties are a way of saving the state to a file and reading it back

Another very nice Java/C# Comparison:  http://www.harding.edu/fmccown/java_csharp_comparison.html

• This one would be best to read first

Java random number generation:

• generating a number in a range:
• http://stackoverflow.com/questions/363681/java-generating-random-number-in-a-range

In doing Repast Simphony development, the RandomHelper class should be used:

• Don't be confused by some of the descriptions of how to do random number in earlier versions of Repast
• Use the RandomHelper
• http://repast.sourceforge.net/docs/reference/SIM/Random%20Numbers.html
• http://repast.sourceforge.net/docs/api/repastjava/repast/simphony/random/RandomHelper.html#RandomHelper()
• RandomHelper has only static methods.
• encapsulates the colt library's random number generation
• Very complicated
• used a uniform distribution by default
• can use
• Beta
• Binomial
• ChiSquare
• etc
• Wraps "Colt":  http://acs.lbl.gov/software/colt/

A very nice example of a Java singleton implementation:  http://www.javaworld.com/javaworld/jw-04-2003/jw-0425-designpatterns.html

Default parameters in Java:

• http://stackoverflow.com/questions/965690/java-optional-parameters
• Doesn't really exist in Java
• http://stackoverflow.com/questions/997482/does-java-support-default-parameter-values
• can be done but is a bit ugly

Calling a constructor within a constructor in Java:  http://stackoverflow.com/questions/285177/how-do-i-call-one-constructor-from-another-in-java

• this(); //without a parameter

Java coding style:

• http://geosoft.no/development/javastyle.html#Naming Conventions
• methods begin in lower case

Declaring generic arrays:

• http://forums.techarena.in/software-development/1117589.htm
• HashMap <?,?> [] x = new HashMap <?,?>[3];
• this work but I could access 'x'
• Best to avoid and wrap in a list instead
• List<HashMap<Class, Class> x = new ArrayList<HashMap<Class1, Class2>(3);
• the above code may not be correct, but it has the idea

C# ArgumentException can be changed to a Java IllegalArgumentException:  https://forums.oracle.com/forums/thread.jspa?threadID=472866

Comparing Java and C# Generics:  http://www.jprl.com/Blog/archive/development/2007/Aug-31.html

• performance advantages in C#

For each Loop in Java:

• http://download.oracle.com/javase/1,5.0/docs/guide/language/foreach.html
• for (List item : arrayList) { }

Generics and array construction in Java:

• http://stackoverflow.com/questions/217065/cannot-create-an-array-of-linkedlists-in-java
• is broken

Comparison between Java HashMap and .NET Hastable:  http://www.microsoft.com/mspress/books/sampchap/6173.aspx#116

Sorting a collection in Java: http://stackoverflow.com/questions/740299/how-do-i-sort-a-set-in-java

• List myList = new ArrayList (collection);
• Collections.sort (mylist);