Changes for page WebObjects with Scala

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1	1	=== What is Scala? ===
2	2
3		-Scala is a language for concurrent computing.
4		-In the day and age of multi-core processors, concurrent computing can't be ignored.
	3	+Scala is a modern language not unlike Groovy.
	4	+It is said to be more powerful (and faster) than Groovy or Ruby which has been the reason for its adoption at sites like Twitter.
5	5
6		-Many of Scala's features have been designed with concurrency in mind.
7		-Some of these may not be unfamiliar to Objective-C or WebObjects developers.
	6	+Many of its features and paradigms favor multi-threading and concurrency. Some of these may not be unfamiliar to Objective-C and WebObjects developers. Here's a summary:
8	8
9		-Here's a quick summary:
10		-
11	11	|= |= Objective-C |= Java |= Scala
12	12	|= Mutable/Immuable Datatypes | Collections //e.g: NSArray/NSMutableArray// | No | Yes
13	13	|= Closures | Blocks (//Extension//) | No | Anonymous Functions
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26	26
27	27	=== Why Use Scala? ===
28	28
	26	+With Web 2.0, building concurrent WebObjects applications is a must.
29	29	Developing and maintaining a concurrent or multi-threaded WebObjects application can be challenging.
30	30
31		-The lack of static variables means that Scala is inherently thread-safe.
32		-It has concurrency that is effectively built-in to the language in the form of Actors.
	29	+Scala offers concurrency that is (effectively) built-in to the language and is inherently thread-safe.
	30	+In other words, developing Ajax (i.e asynchronous communication) with WO will require concurrent request handling and thread-safe code, for which Scala is a better choice than Java.
33	33
34		-So for WebObjects developers, Scala offers itself as a powerful, safe and easy-to-use solution for concurrent applications.
35		-(In other words, Scala can be used for problems that would normally have required threads).
	32	+In addition it may offer new solutions for concurrency in WebObjects and EOF.
36	36
37	37	=== Can WebObjects be Programmed In Scala? ===
38	38
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54	54
55	55	Java:
56	56
57		-{{code value="java"}}
	54	+{{code}}
58	58
59	59	public class _Talent extends EOGenericRecord {
60	60	public static final String ENTITY_NAME = "Talent";
...	...	@@ -65,7 +65,7 @@
65	65
66	66	{{code}}
67	67
68		-object Talent extends EOGenericRecord {
	65	+object _Talent extends EOGenericRecord {
69	69	val ENTITY_NAME = "Talent"
70	70
71	71	{{/code}}
...	...	@@ -76,7 +76,7 @@
76	76
77	77	In Java:
78	78
79		-{{code value="java"}}
	76	+{{code}}
80	80
81	81	import com.webobjects.eocontrol.EOGenericRecord;
82	82	import com.webobjects.eocontrol.EORelationshipManipulation;
...	...	@@ -99,7 +99,7 @@
99	99
100	100	In Java:
101	101
102		-{{code value="java"}}
	99	+{{code}}
103	103
104	104	public class MenuHeader extends WOComponent {
105	105
...	...	@@ -124,7 +124,7 @@
124	124
125	125	In Java:
126	126
127		-{{code value="java"}}
	124	+{{code}}
128	128
129	129	try {
130	130	EditPageInterface epi = D2W.factory().editPageForNewObjectWithEntityNamed(_manipulatedEntityName, session());
...	...	@@ -158,28 +158,6 @@
158	158
159	159	{{/code}}
160	160
161		-==== Scala Annotations vs. Generic Accessors ====
162		-
163		-An example of accessing variables in WebObjects with the following languages:
164		-
165		-|= |= Objective-C |= Java |= Scala
166		-|= getter | ##object name## | ##object.name()## | ##object.name##
167		-|= setter | ##object setName:aName## | ##object.setName(aName)## | ##object.name = aName##
168		-
169		-Of course in Java, we may generate WebObjects classes with "get" methods as well in order to stick to convention.
170		-In scala there is an additional convenience we may use to produce "get" and "set" methods in addition to the default Scala accessors - Scala Annotations.
171		-
172		-E.g, in Main.scala we annotate our component keys with ##@BeanProperty## to automatically create public "set" and "get" methods.
173		-These variables can then be accessed via //KVC//.
174		-
175		-{{code}}
176		-
177		-@BeanProperty var username = new String()
178		-@BeanProperty var password = new String()
179		-@BeanProperty var isAssistantCheckboxVisible = false
180		-
181		-{{/code}}
182		-
183	183	== How to Use Scala Collections with EOF ==
184	184
185	185	One of the benefits of Scala is its very powerful, concurrency-ready collection classes - primarily ##List##, ##Map##, ##Seq## and ##Set##.
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231	231
232	232	1. Point to the local [[Scala versions>>http://wiki.objectstyle.org/confluence/display/WOL/EOGenerator+Templates+and+Additions]] of the .eotemplate files for ##Entity## and ##//Entity//##
233	233	1. Change the File Names Extension to "scala"
234		-1. In Destination Paths set the Superclass Package (e.g: base)
235	235	1. Uncheck Java under Options
236		-
237		-== How to Build & Deploy a WebObjects Scala Project with Ant ==
238		-
239		-1. [[Download>>http://www.scala-lang.org/downloads]] and install Scala
240		-1. Set ##scala.home## (the location Scala has been installed onto) in the project ##build.properties## file
241		-1. [[Add the scalac task and properties>>Configuring Ant to Build Scala with WebObjects]] to the ant build.xml file
242		-1. Run from the project directory: ##sudo ant clean install##