The document discusses features and enhancements in Groovy 1.8.0, including improved AST processing, new logging capabilities using the @Log annotation, support for method locks with @WithReadLock and @WithWriteLock, interruptible loops, memoization of recursive functions, and integration with JSON parsing. Slides provide code examples and diagrams to illustrate these Groovy language and library improvements.

1. Groovy
1.8
Groovy

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3. http://d.hatena.ne.jp/uehaj/
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6. April 28, 2011
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7. April 28, 2011
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8. Slide # JGGUG G*Workshop 17th / 2011.6.17

9. $ cat input.txt
That that is is that that is
not is not is that it it is
$ java WordCount input.txt
1: [That]
2: [not]
2: [it]
4: [that]
6: [is]
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10. Java WordCount:48
Set<Map.Entry<String, Integer>> entrySet =
import java.util.Comparator; map.entrySet();
import java.util.HashMap; Object[] list = entrySet.toArray();
import java.util.Map; Comparator comp = new Comparator(){
import java.util.Set; public int compare(Object o1, Object o2)
import java.util.List; {
import java.util.Arrays; Map.Entry<String, Integer> e1 =
import java.io.FileReader; (Map.Entry<String, Integer>) o1;
import java.io.BufferedReader; Map.Entry<String, Integer> e2 =
import java.io.FileNotFoundException; (Map.Entry<String, Integer>) o2;
import java.io.IOException; return e1.getValue() - e2.getValue();
}
public class WordCount { };
@SuppressWarnings(value = "unchecked") Arrays.sort(list, comp);
public static void main(String[] args) { for (Object it: list) {
FileReader fis = null; Map.Entry<String, Integer> entry =
BufferedReader br = null; (Map.Entry<String, Integer>)it;
try { System.out.println(entry.getValue() + ":
HashMap<String, Integer> map = new ["+entry.getKey()+"]");
HashMap<String, Integer>(); }
fis = new FileReader(args[0]); }
br = new BufferedReader(fis); catch (IOException e) {
String line; try {if (br != null)
while ((line = br.readLine()) != null) { br.close();}catch(IOException ioe){}
for (String it: line.split("s+")) { try {if (fis !=
map.put(it, (map.get(it)==null) ? 1 : null)fis.close();}catch(IOException ioe){}
(map.get(it) + 1)); e.printStackTrace();
} }
} }
}
Slide # 9 JGGUG G*Workshop 17th / 2011.6.17

11. Groovy WordCount(9 )
def map = [:].withDefault{0}
new File(args[0]).eachLine {
it.split(/s+/).each {
map[it]++
}
}
map.entrySet().sort{it.value}.each {
println "${it.value}: [${it.key}]"
}
Slide # 10 JGGUG G*Workshop 17th / 2011.6.17

12. Java
Set<Map.Entry<String, Integer>>
import java.util.Comparator; entrySet = map.entrySet();
import java.util.HashMap; Object[] list = entrySet.toArray();
import java.util.Map; Comparator comp = new Comparator(){
import java.util.Set; public int compare(Object o1,
import java.util.List; Object o2) {
import java.util.Arrays; Map.Entry<String, Integer> e1
import java.io.FileReader; = (Map.Entry<String, Integer>) o1;
import java.io.BufferedReader; Map.Entry<String, Integer> e2
import java.io.FileNotFoundException; = (Map.Entry<String, Integer>) o2;
import java.io.IOException; return e1.getValue() -
e2.getValue();
public class WordCount { }
@SuppressWarnings(value = "unchecked") };
public static void main(String[] args) { Arrays.sort(list, comp);
FileReader fis = null; for (Object it: list) {
BufferedReader br = null; Map.Entry<String, Integer> entry =
try { (Map.Entry<String, Integer>)it;
HashMap<String, Integer> map = new
HashMap<String, Integer>(); System.out.println(entry.getValue() + ":
fis = new FileReader(args[0]); ["+entry.getKey()+"]");
br = new BufferedReader(fis); }
String line; }
while ((line = br.readLine()) != null) catch (IOException e) {
{ try {if (br != null)
for (String it: line.split("s br.close();}catch(IOException ioe){}
+")) { try {if (fis !=
map.put(it, null)fis.close();}catch(IOException ioe){}
(map.get(it)==null) ? 1 : (map.get(it) + 1)); e.printStackTrace();
Slide # 11 }
JGGUG G*Workshop 17th / }
2011.6.17
} }

13. Groovy WordCount(9 )
def map = [:].withDefault{0} // value 0 map
new File(args[0]).eachLine { //
it.split(/s+/).each { // /s+/
map[it]++ // map 1
}
}
map.entrySet().sort{it.value}.each {// map entrySet value
println "${it.value}: [${it.key}]"// key,value
}
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14. (→4
def map = new File(args[0]).text.split(/s+/).countBy{it}
map.entrySet().sort{it.value}.each {
println "${it.value}: [${it.key}]"
}
Slide # 13 JGGUG G*Workshop 17th / 2011.6.17

15. (→4
def map = new File(args[0]).text.split(/s+/).countBy{it}
map.entrySet().sort{it.value}.each {
println "${it.value}: [${it.key}]"
}
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16. Slide # 14 JGGUG G*Workshop 17th / 2011.6.17

17. AST
Groovy 1.8.0
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18. AST
(curry)
Groovy 1.8.0
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19. AST
AST
AST
AST
(curry)
Groovy 1.8.0
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20. AST
AST
AST
AST
(curry)
Groovy 1.8.0
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21. AST
AST
AST
AST
(curry)
Groovy 1.8.0
(GEP3)
$/ /$
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22. AST
AST
AST
AST
(curry)
Groovy 1.8.0
GDK Groovy API
GPars
(GEP3)
GSql
$/ /$
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23. AST
AST
AST
AST
(curry)
Groovy 1.8.0
jar
Grab
GroovyDoc
GDK Groovy API
GPars
(GEP3)
GSql
$/ /$
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24. Groovy 1.8.0
(GEP3)
$/ /$
/
/
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25. println 1+1 //
m1(a1).m2(a2).m3(a3)
m1 a1 m2 a2 m3 a3
Slide # 17 JGGUG G*Workshop 17th / 2011.6.17

26. turn left then right p.p1
// turn(left).then(right)
paint wall with red, green and yellow
// paint(wall).with(red, green).and(yellow)
take 3 cookies
// take(3).cookies
// take(3).getCookies()
given { } when { } then { }
// given({}).when({}).then({})
http://groovy.codehaus.org/Groovy+1.8+release+notes
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27. $/…/$
///…///( )
/…/
a=$/
/$
$/
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28. AST
AST
Groovy 1.8.0 AST
AST
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33. import groovy.util.logging.Log
@Log class MyClass {
def invoke() {
log.info 'info message'
log.fine 'fine message'
}
}
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http://canoo.com/blog/2010/09/20/log-groovys-new-and-extensible-logging-conveniences/

34. log.info < >
< >
log.isLoggabl(java.util.logging.Level.INFO)
? log.info(< >) : null
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http://canoo.com/blog/2010/09/20/log-groovys-new-and-extensible-logging-conveniences/

35. @TupleConstructor class MyClass {
class MyClass { def a
def a def b
def b def c
def c MyClass(a,b,c) {
} this.a=a
} this.b=b
this.c=c
}
}
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http://canoo.com/blog/2010/09/20/log-groovys-new-and-extensible-logging-conveniences/

36. Slide # 27 JGGUG G*Workshop 17th / 2011.6.17

37. class MyClass {
@WithReadLock def () { }
@WithWriteLock def () { }
}
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38. class MyClass {
@WithReadLock def () { }
@WithWriteLock def () { }
}
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39. Slide # 29 JGGUG G*Workshop 17th / 2011.6.17

40. while (true) {
←
println ”xx”
}
while (true) {
if (java.lang.Thread.currentThread().isInterrupted()) {
throw new InterruptedException('Execution
Interrupted')
}
println ”xx”
}
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http://canoo.com/blog/2010/09/20/log-groovys-new-and-extensible-logging-conveniences/

41. foo.groovy:
String a=”ABC”
def bar() { println a }
bar() // => a
class foo extends Script {
void run() {
String a = ”ABC”
bar()
}
def bar() { println a }
}
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42. foo.groovy:
@Field String a=”ABC”
def bar() { println a }
bar() ==> “ABC”
class foo extends Script {
String a = ”ABC”
void run() {
bar()
}
def bar() { println a }
}
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43. Slide # 33 JGGUG G*Workshop 17th / 2011.6.17

44. Groovy 1.8.0
(curry)
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45. @ConditionalInterrupt({ counter > 100 })
class Foo {
int counter = 0
void run() {
while (true) {
counter++ // 100
} // InterruptedException
}
}
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46. //
fib1 = { n ->
n <= 1 ? n : fib1(n - 1) + fib1(n - 2)
}
//
fib2 = { n ->
n <= 1 ? n : fib2(n - 1) + fib2(n - 2)
}.memoize()
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47. …
…
…
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48. Slide # 38 JGGUG G*Workshop 17th / 2011.6.17

49. Groovy 1.8.0
GDK Groovy API
GPars
GSql
JSon
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50. Slide # 40 JGGUG G*Workshop 17th / 2011.6.17

51. !
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52. Java
JSON
‘’’
{"name": "John HashMap
Smith", "age": 33}
‘’’ JsonSlurper
#parseText(
)
‘’’ ArrayList
["milk", "bread",
"eggs"]
‘’’
41
Slide # JGGUG G*Workshop 17th / 2011.6.17

53. JSON
bldr = new JsonBuilder()
bldr {
num 1
‘boolean’ true
arr([1,2,3])
JSonBuilde }
r
JSON
toString()
”””{"num":
42 1,"boolean":true,"
arr":[1,2,3]}”””
Slide # JGGUG G*Workshop 17th / 2011.6.17

54. Java bldr=new JsonBuilder()
bldr([ num:1,
HashMap ’boolean’:true, arr:
JSonBuilde [1,2,3] ])
r
JSON
toString()
“””{"num":
43 1,"boolean":true,"
arr":[1,2,3]}”””
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55. JSON
{
"num": 1,
JSonBuilde toPrettyString() "’boolean’": true,
r "arr": [
1,
2,
3
]
44 }
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56. Groovy 1.8.0
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57. public class FibBench {
static int fib(int n) {
return n <= 1 ? n : fib(n - 1) + fib(n - 2);
}
}
(ms) Java 1
Groovy 1.8.0 2664 2.9
Groovy 1.7.10 26702 28.6
Groovy++ 0.4.230_1.8.0 1067 1.14
Java SE 1.6.0_22 933 1.0
Slide # 46 JGGUG G*Workshop 17th / 2011.6.17

58. ( 10 !)
1.8.0 int
Groovy++
Groovy++ (Java !)
Groovy 1.8
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59. Groovy 1.8.0
jar
Grab
GroovyDoc
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60. $ java -jar /tool/groovy-1.8.0/target/
install/embeddable/groovy-all-1.8.0.jar
fib.groovy
time=2542
time=34
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63. Slide # 52 JGGUG G*Workshop 17th / 2011.6.17