Changes for page WebObjects with Scala

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1	1	=== What is Scala? ===
2	2
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.
	3	+Scala is a language for concurrent computing.
	4	+In the day and age of multi-core processors, concurrent computing can't be ignored.
5	5
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:
	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.
7	7
	9	+Here's a quick summary:
	10	+
8	8	|= |= Objective-C |= Java |= Scala
9	9	|= Mutable/Immuable Datatypes | Collections //e.g: NSArray/NSMutableArray// | No | Yes
10	10	|= Closures | Blocks (//Extension//) | No | Anonymous Functions
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23	23
24	24	=== Why Use Scala? ===
25	25
26		-With Web 2.0, building concurrent WebObjects applications is a must.
27		-Developing and maintaining a concurrent or multi-threaded WebObjects application can be challenging.
	29	+Scala is inherently thread-safe.
	30	+It has concurrency that is effectively built-in to the language.
28	28
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.
	32	+So for WebObjects developers, Scala offers itself as a powerful, safe and easy-to-use solution for concurrent applications. (In other words, Scala Actors can be used for problems that would have normally required threads).
31	31
32		-In addition it may offer new solutions for concurrency in WebObjects and EOF.
33		-
34	34	=== Can WebObjects be Programmed In Scala? ===
35	35
36	36	Yes. It is very simple.
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51	51
52	52	Java:
53	53
54		-{{code}}
	54	+{{code value="java"}}
55	55
56	56	public class _Talent extends EOGenericRecord {
57	57	public static final String ENTITY_NAME = "Talent";
...	...	@@ -73,7 +73,7 @@
73	73
74	74	In Java:
75	75
76		-{{code}}
	76	+{{code value="java"}}
77	77
78	78	import com.webobjects.eocontrol.EOGenericRecord;
79	79	import com.webobjects.eocontrol.EORelationshipManipulation;
...	...	@@ -96,7 +96,7 @@
96	96
97	97	In Java:
98	98
99		-{{code}}
	99	+{{code value="java"}}
100	100
101	101	public class MenuHeader extends WOComponent {
102	102
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117	117	==== Simplified Exception Handling ====
118	118
119	119	Scala doesn't force you to catch exceptions unlike in Java.
120		-In addition, the syntax employs Scala's very powerful pattern matching to handle different exceptions.
	120	+In addition, the syntax employs Scala's very powerful **pattern matching** to handle exceptions.
121	121
122	122	In Java:
123	123
124		-{{code}}
	124	+{{code value="java"}}
125	125
126	126	try {
127	127	EditPageInterface epi = D2W.factory().editPageForNewObjectWithEntityNamed(_manipulatedEntityName, session());
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236	236	1. [[Download>>http://www.scala-lang.org/downloads]] and install Scala
237	237	1. Set ##scala.home## (the location Scala has been installed onto) in the project ##build.properties## file
238	238	1. [[Add the scalac task and properties>>Configuring Ant to Build Scala with WebObjects]] to the ant build.xml file
239		-1. Customise the app classpath file. i.e either ##MacOSClasspath.txt## or ##UNIXClasspath.txt##. You will need to add an entry for ##scala-library.jar##
	239	+1. Run from the project directory: ##sudo ant clean install##