Groovy Update, what's new in Groovy 1.8 and beyond - Guillaume Laforge - SpringOne2GX 2011

Whatʼs new in Groovy 1.8 and beyond?Guillaume LaforgeGroovy Project ManagerSpringSource, a division of VMwareTwitter: @glaforgeBlog: http://glaforge.appspot.com© 2011 SpringOne 2GX 2011. All rights reserved. Do not distribute without permission.

Guillaume Laforge• Groovy Project Manager at VMware • Initiator of the Grails framework • Creator of the Gaelyk toolkit• Co-author of Groovy in Action• Speaking worldwide w/ a French accent• Follow me on... • My blog: http://glaforge.appspot.com • Twitter: @glaforge • Google+: http://gplus.to/glaforge2 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Groovy 1.73 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Groovy 1.71853 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Groovy 1.7185k3 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Groovy 1.7185k FIRST MONTH AFTER RELEASE3 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Groovy 1.7 k3 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Groovy 1.7177k SECOND MONTH AFTER RELEASE3 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Groovy 1.7 k3 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Groovy 1.7362k USERS?3 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

?TIP OFTHEICEBERG

Guesstimate 1/2 Users5 Million @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Agenda6 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Agenda• Whatʼs new in Groovy 1.8? – Nicer DSLs with command chains expressions – Runtime performance improvements – GPars bundled for taming your multicores – Closure enhancements – Builtin JSON support – New AST transformations6 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Agenda• Whatʼs new in Groovy 1.8? – Nicer DSLs with command chains expressions – Runtime performance improvements – GPars bundled for taming your multicores – Closure enhancements – Builtin JSON support – New AST transformations• Whatʼs cooking for Groovy 1.9? – Continued runtime performance improvements – Alignments with JDK 7 • Project Coin (small language changes)6 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions7 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions• A grammar improvement allowing you to drop dots & parens when chaining method calls – an extended version of top-level statements like println7 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions• A grammar improvement allowing you to drop dots & parens when chaining method calls – an extended version of top-level statements like println• Less dots, less parens allow you to – write more readable business rules – in almost plain English sentences • (or any language, of course)7 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions• A grammar improvement allowing you to drop dots & parens when chaining method calls – an extended version of top-level statements like println• Less dots, less parens allow you to – write more readable business rules – in almost plain English sentences • (or any language, of course)• Let’s have a look at some examples7 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions  turn left  then right 8 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions Alternation of method names  turn left  then right 8 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions Alternation of method names  turn left  then right  and parameters (even named ones)8 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions  turn left  then right 8 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions Equivalent to:      (    ).    (     )  turn left  then right 8 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

LookM a!N op are ns,no do ts!

Command chains expressions Before... we used to do... take 2.pills, of: chloroquinine, after: 6.hours10 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions Before... we used to do... take 2.pills, of: chloroquinine, after: 6.hours Normal argument10 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions Before... we used to do... take 2.pills, of: chloroquinine, after: 6.hours Normal argument Named arguments10 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions Before... we used to do... take 2.pills, of: chloroquinine, after: 6.hours Normal argument Named arguments Woud call: def take(Map m, Quantity q)10 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions Now, even less punctuation! take 2.pills  of  chloroquinine  after  6.hours11 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions Now, even less punctuation!     (       ).   (             ).      (       ) take 2.pills  of  chloroquinine  after  6.hours11 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions // environment initialization Integer.metaClass.getPills { ‐> delegate } Integer.metaClass.getHours { ‐> delegate }   // variable injection def chloroquinine = /*...*/   { } // implementing the DSL logic def take(n) {     [of: { drug ‐>         [after: { time ‐> /*...*/ }]     }] } // ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ take 2.pills of chloroquinine after 6.hours12 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions take 2.pills  of  chloroquinine  after  6.hours13 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions take 2.pills  of  chloroquinine  after  6.hours ... some dots remain ...13 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions Yes, we can... get rid of them :-) take 2  pills of  chloroquinine  after  6 hours14 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions Yes, we can... get rid of them :-)     ( ).     (  ).              (     ). (     ) take 2  pills of  chloroquinine  after  6 hours14 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions // variable injection def (of, after, hours) = /*...*/   // implementing the DSL logic { } def take(n) {     [pills: { of ‐>         [chloroquinine: { after ‐>             [6: { time ‐> }]         }]     }] } // ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ take 2 pills of chloroquinine after 6 hours15 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Command chains expressions @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) take coffee  with sugar, milk  and liquor @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) take coffee  with sugar, milk  and liquor // leverage named‐args as punctuation @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) take coffee  with sugar, milk  and liquor // leverage named‐args as punctuation check that: margarita  tastes good @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) take coffee  with sugar, milk  and liquor // leverage named‐args as punctuation check that: margarita  tastes good // closure parameters for new control structures @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) take coffee  with sugar, milk  and liquor // leverage named‐args as punctuation check that: margarita  tastes good // closure parameters for new control structures given {}  when {}  then {} @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) take coffee  with sugar, milk  and liquor // leverage named‐args as punctuation check that: margarita  tastes good // closure parameters for new control structures given {}  when {}  then {} // zero‐arg methods require parens @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) take coffee  with sugar, milk  and liquor // leverage named‐args as punctuation check that: margarita  tastes good // closure parameters for new control structures given {}  when {}  then {} // zero‐arg methods require parens select all  unique() from names @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) take coffee  with sugar, milk  and liquor // leverage named‐args as punctuation check that: margarita  tastes good // closure parameters for new control structures given {}  when {}  then {} // zero‐arg methods require parens select all  unique() from names // possible with an odd number of terms @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) take coffee  with sugar, milk  and liquor // leverage named‐args as punctuation check that: margarita  tastes good // closure parameters for new control structures given {}  when {}  then {} // zero‐arg methods require parens select all  unique() from names // possible with an odd number of terms take 3  cookies @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) take coffee  with sugar, milk  and liquor     (      ).    (           ).   (      ) // leverage named‐args as punctuation check that: margarita  tastes good // closure parameters for new control structures given {}  when {}  then {} // zero‐arg methods require parens select all  unique() from names // possible with an odd number of terms take 3  cookies @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) take coffee  with sugar, milk  and liquor     (      ).    (           ).   (      ) // leverage named‐args as punctuation check that: margarita  tastes good      (               ).      (    ) // closure parameters for new control structures given {}  when {}  then {} // zero‐arg methods require parens select all  unique() from names // possible with an odd number of terms take 3  cookies @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) take coffee  with sugar, milk  and liquor     (      ).    (           ).   (      ) // leverage named‐args as punctuation check that: margarita  tastes good      (               ).      (    ) // closure parameters for new control structures given {}  when {}  then {}      (  ).    (  ).    (  ) // zero‐arg methods require parens select all  unique() from names // possible with an odd number of terms take 3  cookies @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) take coffee  with sugar, milk  and liquor     (      ).    (           ).   (      ) // leverage named‐args as punctuation check that: margarita  tastes good      (               ).      (    ) // closure parameters for new control structures given {}  when {}  then {}      (  ).    (  ).    (  ) // zero‐arg methods require parens select all  unique() from names       (   ).        .    (     ) // possible with an odd number of terms take 3  cookies @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Command chains expressions // methods with multiple arguments (commas) take coffee  with sugar, milk  and liquor     (      ).    (           ).   (      ) // leverage named‐args as punctuation check that: margarita  tastes good      (               ).      (    ) // closure parameters for new control structures given {}  when {}  then {}      (  ).    (  ).    (  ) // zero‐arg methods require parens select all  unique() from names       (   ).        .    (     ) // possible with an odd number of terms take 3  cookies     ( ). @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 16

Runtime performance improvements• Significant runtime improvements for primitive type operations – classical Fibonacci example x13 faster! – almost as fast as Java• Some direct method calls on this17 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

GPars bundled• GPars is bundled in the Groovy distribution• GPars covers a wide range of parallel and concurrent paradigms – actors, fork/join, map/filter/reduce, dataflow, agents, STM – parallel arrays, executors, and more...• Don’t miss the following presentations on GPars – Paul King — Thursday, 12:45 - 2:15PM • Groovy & Concurrency with GPars – Venkat Subramaniam — Friday, 8:30 - 10:00AM18 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure enhancements• Closure annotation parameters• Some more functional flavor – composition – trampoline – memoization• Currying improvements19 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure annotation parameters @Retention(RetentionPolicy.RUNTIME) @interface Invariant {         Class value() // a closure class }   { @Invariant({ number >= 0 }) class Distance {         float number         String unit }    def d = new Distance(number: 10, unit: "meters")  def anno = Distance.getAnnotation(Invariant) def check = anno.value().newInstance(d, d) assert check(d)20 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure annotation parameters @Retention(RetentionPolicy.RUNTIME) @interface Invariant {         Class value() // a closure class }   { @Invariant({ number >= 0 }) class Distance {         float number     an’s G Cont racts     String unit P oor-m }    def d = new Distance(number: 10, unit: "meters")  def anno = Distance.getAnnotation(Invariant) def check = anno.value().newInstance(d, d) assert check(d)20 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure composition def plus2  = { it + 2 } def times3 = { it * 3 }   { def times3plus2 = plus2 << times3 assert times3plus2(3) == 11 assert times3plus2(4) == plus2(times3(4))   { def plus2times3 = times3 << plus2 assert plus2times3(3) == 15 assert plus2times3(5) == times3(plus2(5))    // reverse composition{ assert times3plus2(3) == (times3 >> plus2)(3) @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge 21

Closure trampoline22 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure trampoline def factorial factorial = { int n, BigInteger accu = 1G ‐>        if (n < 2) return accu          factorial.trampoline(n ‐ 1, n * accu) }.trampoline()   assert factorial(1)    == 1 assert factorial(3)    == 1 * 2 * 3 assert factorial(1000) == 402387260...22 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure memoization23 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure memoization def plus = { a, b ‐> sleep 1000; a + b }.memoize()23 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure memoization def plus = { a, b ‐> sleep 1000; a + b }.memoize() assert plus(1, 2) == 3 // after 1000ms23 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure memoization def plus = { a, b ‐> sleep 1000; a + b }.memoize() assert plus(1, 2) == 3 // after 1000ms assert plus(1, 2) == 3 // return immediately23 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure memoization def plus = { a, b ‐> sleep 1000; a + b }.memoize() assert plus(1, 2) == 3 // after 1000ms assert plus(1, 2) == 3 // return immediately assert plus(2, 2) == 4 // after 1000ms23 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure memoization def plus = { a, b ‐> sleep 1000; a + b }.memoize() assert plus(1, 2) == 3 // after 1000ms assert plus(1, 2) == 3 // return immediately assert plus(2, 2) == 4 // after 1000ms assert plus(2, 2) == 4 // return immediately  23 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure memoization def plus = { a, b ‐> sleep 1000; a + b }.memoize() assert plus(1, 2) == 3 // after 1000ms assert plus(1, 2) == 3 // return immediately assert plus(2, 2) == 4 // after 1000ms assert plus(2, 2) == 4 // return immediately    23 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure memoization def plus = { a, b ‐> sleep 1000; a + b }.memoize() assert plus(1, 2) == 3 // after 1000ms assert plus(1, 2) == 3 // return immediately assert plus(2, 2) == 4 // after 1000ms assert plus(2, 2) == 4 // return immediately     // at least 10 invocations cached23 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure memoization def plus = { a, b ‐> sleep 1000; a + b }.memoize() assert plus(1, 2) == 3 // after 1000ms assert plus(1, 2) == 3 // return immediately assert plus(2, 2) == 4 // after 1000ms assert plus(2, 2) == 4 // return immediately     // at least 10 invocations cached def plusAtLeast = { ... }.memoizeAtLeast(10)23 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure memoization def plus = { a, b ‐> sleep 1000; a + b }.memoize() assert plus(1, 2) == 3 // after 1000ms assert plus(1, 2) == 3 // return immediately assert plus(2, 2) == 4 // after 1000ms assert plus(2, 2) == 4 // return immediately     // at least 10 invocations cached def plusAtLeast = { ... }.memoizeAtLeast(10)  23 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure memoization def plus = { a, b ‐> sleep 1000; a + b }.memoize() assert plus(1, 2) == 3 // after 1000ms assert plus(1, 2) == 3 // return immediately assert plus(2, 2) == 4 // after 1000ms assert plus(2, 2) == 4 // return immediately     // at least 10 invocations cached def plusAtLeast = { ... }.memoizeAtLeast(10)   // at most 10 invocations cached23 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure memoization def plus = { a, b ‐> sleep 1000; a + b }.memoize() assert plus(1, 2) == 3 // after 1000ms assert plus(1, 2) == 3 // return immediately assert plus(2, 2) == 4 // after 1000ms assert plus(2, 2) == 4 // return immediately     // at least 10 invocations cached def plusAtLeast = { ... }.memoizeAtLeast(10)   // at most 10 invocations cached def plusAtMost = { ... }.memoizeAtMost(10) 23 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure memoization def plus = { a, b ‐> sleep 1000; a + b }.memoize() assert plus(1, 2) == 3 // after 1000ms assert plus(1, 2) == 3 // return immediately assert plus(2, 2) == 4 // after 1000ms assert plus(2, 2) == 4 // return immediately     // at least 10 invocations cached def plusAtLeast = { ... }.memoizeAtLeast(10)   // at most 10 invocations cached def plusAtMost = { ... }.memoizeAtMost(10)  // between 10 and 20 invocations cached23 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Closure memoization def plus = { a, b ‐> sleep 1000; a + b }.memoize() assert plus(1, 2) == 3 // after 1000ms assert plus(1, 2) == 3 // return immediately assert plus(2, 2) == 4 // after 1000ms assert plus(2, 2) == 4 // return immediately     // at least 10 invocations cached def plusAtLeast = { ... }.memoizeAtLeast(10)   // at most 10 invocations cached def plusAtMost = { ... }.memoizeAtMost(10)  // between 10 and 20 invocations cached def plusAtLeast = { ... }.memoizeBetween(10, 20)23 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Currying improvements24 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Currying improvements // right currying def divide = { a, b ‐> a / b } def halver = divide.rcurry(2) assert halver(8) == 4    24 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Currying improvements // right currying def divide = { a, b ‐> a / b } def halver = divide.rcurry(2) assert halver(8) == 4     // currying n‐th parameter def joinWithSeparator =      { one, sep, two ‐> one + sep + two } def joinWithComma =      joinWithSeparator.ncurry(1, , ) assert joinWithComma(a, b) == a, b24 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Builtin JSON support• Consuming• Producing• Pretty-printing25 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Builtin JSON support import groovy.json.*  def payload = new URL(     "http://github.../json/commits/...").text  def slurper = new JsonSlurper() def doc = slurper.parseText(payload)  doc.commits.message.each { println it }26 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Builtin JSON support import groovy.json.*    def json = new JsonBuilder()    json.person {         name "Guillaume"     age 33         pets "Hector", "Felix" }  println json.toString()27 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Builtin JSON support import groovy.json.*    println JsonOutput.prettyPrint(     {"person":{"name":"Guillaume","age":33, +      "pets":["Hector","Felix"]}})  28 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Builtin JSON support import groovy.json.*    println JsonOutput.prettyPrint(     {"person":{"name":"Guillaume","age":33, +      "pets":["Hector","Felix"]}})   {         "person": {                 "name": "Guillaume",              "age": 33,                 "pets": [                         "Hector",                         "Felix"                 ]         } }28 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New AST transformations• @Log – @ConditionalInterrupt• @Field • @Canonical – @ToString, – @EqualsAndHashCode,• @AutoClone – @TupleConstructor• @AutoExternalizable • @InheritConstructor• Controlling the execution of your code – @ThreadInterrupt, • @WithReadLock – @TimedInterrupt, • @WithWriteLock29 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@Log• Four different loggers can be injected – @Log, @Commons, @Log4j, @Slf4j• Possible to implement your own strategy import groovy.util.logging.*    @Log class Car {         Car() {                 log.info Car constructed         } }    def c = new Car()30 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@Log• Four different loggers can be injected – @Log, @Commons, @Log4j, @Slf4j• Possible to implement your own strategy import groovy.util.logging.*    @Log class Car {    Guarded     Car() {        w/ an if         log.info Car constructed         } }    def c = new Car()30 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@Field• Surprising scoping rules in scripts – variables are local to the run() method – variables aren’t visible in methods • although visually the variable is in a surrounding scope• @Field creates a field in the script class @Field List awe = [1, 2, 3] def awesum() { awe.sum() } assert awesum() == 631 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Controlling code execution• Your application may run user’s code – what if the code runs in infinite loops or for too long? – what if the code consumes too many resources?32 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Controlling code execution• Your application may run user’s code – what if the code runs in infinite loops or for too long? – what if the code consumes too many resources?• 3 new transforms at your rescue – @ThreadInterrupt: adds Thread#isInterrupted checks so your executing thread stops when interrupted – @TimedInterrupt: adds checks in method and closure bodies to verify it’s run longer than expected – @ConditionalInterrupt: adds checks with your own conditional logic to break out from the user code32 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@ThreadInterrupt @ThreadInterrupt import groovy.transform.ThreadInterrupt    while (true) {     // eat lots of CPU } 33 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@ThreadInterrupt @ThreadInterrupt import groovy.transform.ThreadInterrupt    while (true) { {     if (Thread.currentThread.isInterrupted())         throw new InterruptedException() }     // eat lots of CPU } 33 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@ThreadInterrupt @ThreadInterrupt import groovy.transform.ThreadInterrupt    while (true) { {     if (Thread.currentThread.isInterrupted())         throw new InterruptedException() }     // eat lots of CPU }• Two optional annotation parameters available – checkOnMethodStart (true by default) – applyToAllClasses (true by default) 33 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@TimedInterrupt @TimedInterrupt(10) import groovy.transform.TimedInterrupt    while (true) {     // eat lots of CPU }• InterruptedException thrown when checks indicate code ran longer than desired• Optional annotation parameters available – same as @ThreadInterrupt – value: for an amount of time duration34 – unit: for the time duration unit (TimeUnit.SECONDS) @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@ConditionalInterrupt• Specify your own condition to be inserted at the start of method and closure bodies – check for available resources, number of times run, etc.• Leverages closure annotation parameters from Groovy 1.8 @ConditionalInterrupt({ counter++ > 2 }) import groovy.transform.ConditionalInterrupt import groovy.transform.Field    @Field int counter = 0  100.times {         println executing script method... }35 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@ToString• Provides a default toString() method to your types• Available annotation options – includeNames, includeFields, includeSuper, excludes import groovy.transform.ToString    @ToString class Person {         String name         int age }    println new Person(name: Pete, age: 15) // => Person(Pete, 15)36 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@EqualsAndHashCode• Provides default implementations for equals() and hashCode() methods import groovy.transform.EqualsAndHashCode    @EqualsAndHashCode class Coord {         int x, y }    def c1 = new Coord(x: 20, y: 5) def c2 = new Coord(x: 20, y: 5)    assert c1 == c2 assert c1.hashCode() == c2.hashCode()37 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@TupleConstructor• Provides a «classical» constructor with all properties• Several annotation parameter options available import groovy.transform.TupleConstructor    @TupleConstructor  class Person {         String name         int age }    def m = new Person(Marion, 3)         assert m.name == Marion assert m.age  == 338 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@Canonical• One annotation to rule them all! – @Canonical mixes together • @ToString • @EqualsAndHashCode • @TupleConstructor• You can customize behavior by combining @Canonical and one of the other annotations39 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@InheritConstructor• Classes like Exception are painful when extended, as all the base constructors should be replicated class CustomException extends Exception {     CustomException()                        { super()       }     CustomException(String msg)              { super(msg)    }     CustomException(String msg, Throwable t) { super(msg, t) }     CustomException(Throwable t)             { super(t)      } }40 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@InheritConstructor• Classes like Exception are painful when extended, as all the base constructors should be replicated import groovy.transform.* @InheritConstructors class CustomException extends Exception {     CustomException()                        { super()       }     CustomException(String msg)              { super(msg)    }     CustomException(String msg, Throwable t) { super(msg, t) }     CustomException(Throwable t)             { super(t)      } }40 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@WithReadLock, @WithWriteLock import groovy.transform.*    class ResourceProvider {         private final Map<String, String> data = new HashMap<>()       @WithReadLock         String getResource(String key) {                 return data.get(key)         }            @WithWriteLock         void refresh() {                 //reload the resources into memory         } }41 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

@WithReadLock, @WithWriteLock import groovy.transform.*    class ResourceProvider {         private final Map<String, String> data = new HashMap<>()  {     @WithReadLock         String getResource(String key) {                 return data.get(key)         }       {     @WithWriteLock         void refresh() {                 //reload the resources into memory         } }41 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Miscelanous• Compilation customizers• Java 7 diamond operator• Slashy and dollar slashy strings• New GDK methods• (G)String to Enum coercion42 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Compilation customizers• Ability to apply some customization to the Groovy compilation process• Three available customizers – ImportCustomizer – SecureASTCustomizer – ASTTransformationCustomizer• But you can implement your own43 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Imports customizer def configuration = new CompilerConfiguration()   def custo = new ImportCustomizer() custo.addStaticStar(Math.name) configuration.addCompilationCustomizers(custo)    def result = new GroovyShell(configuration)     .evaluate(" cos PI/3 ")44 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Applying an AST transformation def configuration = new CompilerConfiguration() configuration.addCompilationCustomizers(     new ASTTransformationCustomizer(Log))    new GroovyShell(configuration).evaluate("""     class Car {                 Car() {                         log.info Car constructed                 }         }          log.info Constructing a car         def c = new Car() """)45 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Secure AST customizer Idea: Implement an «arithmetic shell» Being able control what a user script is allowed to do: only arithmetic expressions• Let’s setup our environment – some imports – an import customizer to import java.lang.Math.* – prepare a secure AST customizer import org.codehaus.groovy.control.customizers.* import org.codehaus.groovy.control.* import static org.codehaus.groovy.syntax.Types.*   def imports = new ImportCustomizer().addStaticStars(java.lang.Math) def secure = new SecureASTCustomizer()46 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Secure AST customizer ... secure.with { // disallow closure creation closuresAllowed = false  // disallow method definitions methodDefinitionAllowed = false    // empty white list => forbid imports importsWhitelist = []  staticImportsWhitelist = [] // only allow the java.lang.Math.* static import staticStarImportsWhitelist = [java.lang.Math ...47 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Secure AST customizer ... // language tokens allowed tokensWhitelist = [ PLUS, MINUS, MULTIPLY, DIVIDE, MOD, POWER, PLUS_PLUS,  MINUS_MINUS, COMPARE_EQUAL, COMPARE_NOT_EQUAL,  COMPARE_LESS_THAN, COMPARE_LESS_THAN_EQUAL,  COMPARE_GREATER_THAN, COMPARE_GREATER_THAN_EQUAL ]   // types allowed to be used (including primitive types) constantTypesClassesWhiteList = [ Integer, Float, Long, Double, BigDecimal,  Integer.TYPE, Long.TYPE, Float.TYPE, Double.TYPE ]   // classes who are allowed to be receivers of method calls receiversClassesWhiteList = [  Math, Integer, Float, Double, Long, BigDecimal ] } ...48 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Secure AST customizer• Ready to evaluate our arithmetic expressions! ... def config = new CompilerConfiguration() config.addCompilationCustomizers(imports, secure) def shell = new GroovyShell(config)   shell.evaluate cos PI/3• But the following would have failed: shell.evaluate System.exit(0)49 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Slashy and dollar slashy strings• Slashy strings are now multiline – particularly handy for multi-line regexs• Dollar slashy string notation introduced def (name, date) = ["Guillaume", "Oct, 26th"] def dollarSlashy = $/         Hello $name, today were ${date}     $ dollar‐sign         $$ dollar‐sign          backslash         / slash        $/ slash /$ 50 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 551 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 5  51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 5   // count by51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 5   // count by assert [0:2, 1:3] == [1,2,3,4,5].countBy{ it % 2 }51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 5   // count by assert [0:2, 1:3] == [1,2,3,4,5].countBy{ it % 2 } assert [(true):2, (false):4]      == Groovy.toList().countBy{ it == o }51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 5   // count by assert [0:2, 1:3] == [1,2,3,4,5].countBy{ it % 2 } assert [(true):2, (false):4]      == Groovy.toList().countBy{ it == o }  51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 5   // count by assert [0:2, 1:3] == [1,2,3,4,5].countBy{ it % 2 } assert [(true):2, (false):4]      == Groovy.toList().countBy{ it == o }   // min/max for maps with closures51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 5   // count by assert [0:2, 1:3] == [1,2,3,4,5].countBy{ it % 2 } assert [(true):2, (false):4]      == Groovy.toList().countBy{ it == o }   // min/max for maps with closures def map = [a: 1, bbb: 4, cc: 5, dddd: 2] 51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 5   // count by assert [0:2, 1:3] == [1,2,3,4,5].countBy{ it % 2 } assert [(true):2, (false):4]      == Groovy.toList().countBy{ it == o }   // min/max for maps with closures def map = [a: 1, bbb: 4, cc: 5, dddd: 2]  assert map.max { it.key.size() }.key == dddd51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 5   // count by assert [0:2, 1:3] == [1,2,3,4,5].countBy{ it % 2 } assert [(true):2, (false):4]      == Groovy.toList().countBy{ it == o }   // min/max for maps with closures def map = [a: 1, bbb: 4, cc: 5, dddd: 2]  assert map.max { it.key.size() }.key == dddd assert map.min { it.value }.value == 151 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 5   // count by assert [0:2, 1:3] == [1,2,3,4,5].countBy{ it % 2 } assert [(true):2, (false):4]      == Groovy.toList().countBy{ it == o }   // min/max for maps with closures def map = [a: 1, bbb: 4, cc: 5, dddd: 2]  assert map.max { it.key.size() }.key == dddd assert map.min { it.value }.value == 1  51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 5   // count by assert [0:2, 1:3] == [1,2,3,4,5].countBy{ it % 2 } assert [(true):2, (false):4]      == Groovy.toList().countBy{ it == o }   // min/max for maps with closures def map = [a: 1, bbb: 4, cc: 5, dddd: 2]  assert map.max { it.key.size() }.key == dddd assert map.min { it.value }.value == 1   // map withDefault()51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 5   // count by assert [0:2, 1:3] == [1,2,3,4,5].countBy{ it % 2 } assert [(true):2, (false):4]      == Groovy.toList().countBy{ it == o }   // min/max for maps with closures def map = [a: 1, bbb: 4, cc: 5, dddd: 2]  assert map.max { it.key.size() }.key == dddd assert map.min { it.value }.value == 1   // map withDefault() def words = "one two two three three three".split()51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 5   // count by assert [0:2, 1:3] == [1,2,3,4,5].countBy{ it % 2 } assert [(true):2, (false):4]      == Groovy.toList().countBy{ it == o }   // min/max for maps with closures def map = [a: 1, bbb: 4, cc: 5, dddd: 2]  assert map.max { it.key.size() }.key == dddd assert map.min { it.value }.value == 1   // map withDefault() def words = "one two two three three three".split() def freq = [:].withDefault { k ‐> 0 }51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

New GDK methods // count assert [2,4,2,1,3,5,2,4,3].count { it % 2 == 0 } == 5   // count by assert [0:2, 1:3] == [1,2,3,4,5].countBy{ it % 2 } assert [(true):2, (false):4]      == Groovy.toList().countBy{ it == o }   // min/max for maps with closures def map = [a: 1, bbb: 4, cc: 5, dddd: 2]  assert map.max { it.key.size() }.key == dddd assert map.min { it.value }.value == 1   // map withDefault() def words = "one two two three three three".split() def freq = [:].withDefault { k ‐> 0 } words.each { freq[it] += 1 }51 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

(G)String to Enum coercion52 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

(G)String to Enum coercion enum Color {    52 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

(G)String to Enum coercion enum Color {         red, green, blue52 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

(G)String to Enum coercion enum Color {         red, green, blue } 52 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

(G)String to Enum coercion enum Color {         red, green, blue }   52 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

(G)String to Enum coercion enum Color {         red, green, blue }    // coercion with as52 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

(G)String to Enum coercion enum Color {         red, green, blue }    // coercion with as def r = "red" as Color 52 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

(G)String to Enum coercion enum Color {         red, green, blue }    // coercion with as def r = "red" as Color   52 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

(G)String to Enum coercion enum Color {         red, green, blue }    // coercion with as def r = "red" as Color    // implicit coercion52 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

(G)String to Enum coercion enum Color {         red, green, blue }    // coercion with as def r = "red" as Color    // implicit coercion Color b = "blue" 52 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

(G)String to Enum coercion enum Color {         red, green, blue }    // coercion with as def r = "red" as Color    // implicit coercion Color b = "blue"   52 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

(G)String to Enum coercion enum Color {         red, green, blue }    // coercion with as def r = "red" as Color    // implicit coercion Color b = "blue"    // with GStrings too52 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

(G)String to Enum coercion enum Color {         red, green, blue }    // coercion with as def r = "red" as Color    // implicit coercion Color b = "blue"    // with GStrings too def g = "${green}" as Color52 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Customizing the Groovysh prompt53 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Launching remote scripts• With the Groovy command, you can launch remote scripts > groovy http://groovyconsole.appspot.com/raw/110001• Be careful to what you’re executing :-)54 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

What’scookingfor 1.9?

Groovy 1.9 roadmap• Java 7 alignements: Project Coin – binary literals – underscore in literals – multicatch• JDK 7: InvokeDynamic• Towards a more modular Groovy• Static type checking and compilation• Miscelanous• What else? Your call!56 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Java 7 / JDK 7• Project Coin and InvokeDynamic57 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Binary literals• We had decimal, octal and hexadecimal notations for number literals int x = 0b10101111 assert x == 175   byte aByte = 0b00100001 assert aByte == 33   int anInt = 0b1010000101000101 assert anInt == 4128558 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Underscore in literals• Now we can also add underscores in number literals for more readability long creditCardNumber = 1234_5678_9012_3456L long socialSecurityNumbers = 999_99_9999L float monetaryAmount = 12_345_132.12 long hexBytes = 0xFF_EC_DE_5E long hexWords = 0xFFEC_DE5E long maxLong = 0x7fff_ffff_ffff_ffffL long alsoMaxLong = 9_223_372_036_854_775_807L long bytes = 0b11010010_01101001_10010100_1001001059 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Multicatch• One block for multiple exception caught – rather than duplicating the block try {     /* ... */ } catch(IOException | NullPointerException e) {     /* one block to treat 2 exceptions */ }60 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

InvokeDynamic• Groovy 1.9 will support JDK 7ʼs invokeDynamic – an «indy» branch started recently – compiler will have a flag for compiling against JDK 7• Benefits – more runtime performance! – in the long run, will allow us to get rid of code! • call site caching, thanks to MethodHandles • metaclass registry, thanks to ClassValues • will let the JIT inline calls more easily61 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Groovy Modularity• Groovy’s «all» JAR weighs in at 4MB• Nobody needs everything – Template engine, Ant scripting, Swing UI building...• Provide a smaller core – and several smaller JARs per feature• Paul King covers Groovy modularisation – Wednesday, 12:45-2:15PM62 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Static Type Checking• Goal: make the Groovy compiler «grumpy»! – and throw compilation errors (not at runtime)• Not everybody needs dynamic features all the time – think Java libraries scripting• Grumpy should... – tell you about your method or variable typos – complain if you call methods that don’t exist – shout on assignments of wrong types – infer the types of your variables – figure out GDK methods63 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

A typo in your variable or method names import groovy.transform.StaticTypes   void method() {}   @TypeChecked test() {     // Cannot find matching method metthhoood()     metthhoood()       def name = "Guillaume"     // variable naamme is undeclared     println naamme }64 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

A typo in your variable or method names import groovy.transform.StaticTypes   void method() {}   @TypeChecked test() {     // Cannot find matching method metthhoood()     metthhoood()       def name = "Guillaume"     // variable naamme is undeclared Compilation     println naamme errors! }64 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Complain on wrong assignments // cannot assign value of type... to variable... int x = new Object() Set set = new Object()   def o = new Object() int x = o   String[] strings = [a,b,c] int str = strings[0]   // cannot find matching method plus() int i = 0 i += 165 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Complain on wrong assignments // cannot assign value of type... to variable... int x = new Object() Set set = new Object() Compilation   errors! def o = new Object() int x = o   String[] strings = [a,b,c] int str = strings[0]   // cannot find matching method plus() int i = 0 i += 165 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Complain on wrong return types String method() { String } // cannot assign value of type String... int x = method() // checks if/else branch return values int method() {     if (true) { String }     else { 42 } } // works for switch/case & try/catch/finally   // transparent toString() implied String greeting(String name) {     def sb = new StringBuilder()     sb << "Hi" << name }66 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Complain on wrong return types String method() { String } // cannot assign value of type String... int x = method() Compilation errors! // checks if/else branch return values int method() {     if (true) { String }     else { 42 } } // works for switch/case & try/catch/finally   // transparent toString() implied String greeting(String name) {     def sb = new StringBuilder()     sb << "Hi" << name }66 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Type inference @TypeChecked test() {     def name = "  Guillaume  "       // String type infered (even inside GString)     println "NAME = ${name.toUpperCase()}"        // Groovy GDK method support     // (GDK operator overloading too)     println name.trim()       int[] numbers = [1, 2, 3]     // Element n is an int     for (int n in numbers) {         println n     } }67 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Staticly checked method & dynamic method @TypeChecked String greeting(String name) {     // call method with dynamic behavior     // but with proper signature     generateMarkup(name.toUpperCase()) }   // usual dynamic behavior String generateMarkup(String name) {     def sw = new StringWriter()     new MarkupBuilder(sw).html {         body {             div name         }     }     sw.toString() }68 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Bytecode viewer• Groovy Console’s bytecode viewer from the AST browser window – select class generation phase – select a class node69 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Disable Global AST transformations // witout a specific configuration, the AST builder works def shell = new GroovyShell() shell.evaluate(script) // passes def config = new CompilerConfiguration() config.disabledGlobalASTTransformations =     [org.codehaus.groovy.ast.builder.AstBuilderTransformation] def script =      import org.codehaus.groovy.ast.builder.AstBuilder     new AstBuilder().buildFromCode { "Hello" }   // now with the configuration in place, // the AST builder transform is not applied shell = new GroovyShell(config) // <‐‐ with the configuration shouldFail {     shell.evaluate(script) // fails }70 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Summary71 @glaforge — http://glaforge.appspot.com — ROCKS! http://gplus.to/glaforge

Thank you! e L aforg pment aume vy Develo Guill Groo m Hea d of g mail.co aforge@ mail: gl glaforge e E @ o /glaforg T witter : http://gplus.t Go ogle+:72 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

Image credits• Iceberg: http://hqworld.net/gallery/data/media/20/tip_of_the_iceberg.jpg• Bicycle: http://drunkcyclist.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=2131&g2_serialNumber=2• Pills: http://www.we-ew.com/wp-content/uploads/2011/01/plan-b-pills.jpg• Chains: http://2.bp.blogspot.com/-GXDVqUYSCa0/TVdBsON4tdI/AAAAAAAAAW4/EgJOUmAxB28/s1600/breaking-chains5_copy9611.jpg• Cooking: http://www.flickr.com/photos/eole/449958332/sizes/l/• Oui nide iou: http://desencyclopedie.wikia.com/wiki/Fichier:Superdupont_we_need_you.jpg• Guitar: http://www.lelitteraire.com/IMG/breveon323.jpg• Trampoline: http://www.fitness-online.fr/images/trampoline-1-m.jpg• Curry: http://www.pot-a-epices.com/wp-content/uploads/2009/02/curry1.jpg• Slurp: http://www.ohpacha.com/218-532-thickbox/gamelle-slurp.jpg• Caution: http://www.jeunes-epinay-sur-seine.fr/wp-content/uploads/2010/11/caution-colocation.jpg• Grumpy: http://mafeuilledechou.fr/__oneclick_uploads/2010/05/grumpy.jpg• Modularity: http://php.jglobal.com/blog/wp-content/uploads/2009/11/modularity.jpg• Agenda: http://www.plombiereslesbains.fr/images/stories/agenda.jpg• Java 7: http://geeknizer.com/wp-content/uploads/java7.jpg• WIP: http://www.connetport.com/wp-content/uploads/Work_in_progress.svg_.png• Grumpy 2: http://grumpy.division-par-zero.fr/wp-content/images/grumpy.jpg•74 @glaforge — http://glaforge.appspot.com — http://gplus.to/glaforge

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Groovy Update, what's new in Groovy 1.8 and beyond - Guillaume Laforge - SpringOne2GX 2011

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Groovy Update, what’s new in Groovy 1.8 and beyond - Guillaume Laforge - SpringOne2GX 2011 Presentation Transcript