The document discusses JavaScript and its ecosystem from the perspective of the Java Virtual Machine (JVM). It covers topics like using JavaScript with the Rhino engine to access Java libraries from JavaScript, optimizing JavaScript code by inlining methods and reusing objects to avoid function creation overhead, and how JavaScript code can be compiled to JVM bytecode using a simple set of instructions.

1. JavaScript
por debaixo dos panos
ecossistema e linguagem na perspectiva da JVM
@qmx
http://blog.qmx.me/
Saturday, May 14, 2011

2. www.gonow.com.br
www.caelum.com.br
Text
gitshelf.com
Saturday, May 14, 2011

3. quê?
Saturday, May 14, 2011

4. O Desenvolvedor
Saturday, May 14, 2011

5. O Cliente
Saturday, May 14, 2011

6. O processo de deploy
Saturday, May 14, 2011

7. Homologação
Saturday, May 14, 2011

8. Sem pacote RPM?
Saturday, May 14, 2011

9. Pacotes fáceis de Fazer
Saturday, May 14, 2011

10. Deploy Simples
Saturday, May 14, 2011

11. Um Zipão
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12. à prova de
sobrinho
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13. Java!
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14. Java?
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15. porquê?
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16. não é node.js
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17. node.js
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18. Saturday, May 14, 2011

19. node.js tem
potencial
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20. MAS
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21. node.js não é
bala de prata
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22. 100% async não é pra
qualquer um
Saturday, May 14, 2011

23. “mais de um
jeito de fazer”
Consultor Sênior
Saturday, May 14, 2011

24. ringojs
Saturday, May 14, 2011

25. 10 anos de idade!
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26. “Ringo takes a pragmatical
and non-dogmatic stance on
things like I/O paradigms.”
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27. DTSTTCPW
Faça a coisa mais simples
possível com potencial de
funcionar
Saturday, May 14, 2011

28. (QUASE) NADA
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29. como?
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30. reutilizando a roda
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31. ➜ rhino1_7R3 java -jar js.jar
Rhino 1.7 release 3 2011 05 10
js> date = new java.util.Date();
Thu May 12 11:12:24 BRT 2011
Saturday, May 14, 2011

32. Qualquer biblioteca
java já existente
Saturday, May 14, 2011

33. in-process cache?
distributed cache?
roll your own?
Saturday, May 14, 2011

34. EHCACHE
Saturday, May 14, 2011

35. Agendamento de
Tarefas?
Saturday, May 14, 2011

36. Quartz
Saturday, May 14, 2011

37. Busca textual?
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38. Lucene / Solr
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39. E muito mais!
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40. um problema
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41. Rhino é lento
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42. porquê?
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43. Saturday, May 14, 2011

44. Saturday, May 14, 2011

45. Não é V8
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46. meh
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47. VM
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48. Vantagens
e
Desvantagens
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49. poor’s man computer?
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50. KISS
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51. e o JavaScript?
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52. como otimizar?
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53. 1 function Carro(nome, cor) {
2 this.nome = nome;
3 this.cor = cor;
4 this.anda = function(){
5 print("andando");
6 }
7 }
8
9 var x = new Carro("trovão azul", "azul (duh)");
10 x.anda();
Saturday, May 14, 2011

54. 1 function Carro(nome, cor) {
2 this.nome = nome;
3 this.cor = cor;
4 this.anda = function(){
5 print("andando");
6 }
7 }
8
9 var x = new Carro("trovão azul", "azul (duh)");
10 x.anda();
Saturday, May 14, 2011

55. 1 function MotorV8(){
2 this.liga = function(){
3 print("ligando...");
4 }
5 }
Saturday, May 14, 2011

56. 7 function Carro(nome, cor) {
8 this.nome = nome;
9 this.cor = cor;
10 this.motor = new MotorV8();
11 this.anda = function(){
12 print("andando");
13 }
14 this.liga = function(){
15 this.motor.liga();
16 }
17 }
Saturday, May 14, 2011

57. 19 var x = new Carro("trovão azul", "azul (duh)");
20
21 for(var i = 0; i< 10000; i++){
22 x.liga();
23 }
Saturday, May 14, 2011

58. 19 var x = new Carro("trovão azul", "azul (duh)");
20
21 for(var i = 0; i< 10000; i++){
22 x.liga();
23 }
Saturday, May 14, 2011

59. inline de métodos
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60. 19 var x = new Carro("trovão azul", "azul (duh)");
20
21 for(var i = 0; i< 10000; i++){
22 print(“ligando...”);
23 }
Saturday, May 14, 2011

61. Replay
Saturday, May 14, 2011

62. 1 function MotorV8(){
2 this.liga = function(){
3 print("ligando...");
4 }
5 }
Saturday, May 14, 2011

63. 7 function Carro(nome, cor) {
8 this.nome = nome;
9 this.cor = cor;
10 this.motor = new MotorV8();
11 this.anda = function(){
12 print("andando");
13 }
14 this.liga = function(){
15 this.motor.liga();
16 }
17 }
Saturday, May 14, 2011

64. 19 var x = new Carro("trovão azul", "azul (duh)");
20
21 for(var i = 0; i< 10000; i++){
22 print(“ligando...”);
23 }
Saturday, May 14, 2011

65. problemas?
Saturday, May 14, 2011

66. #fail
Saturday, May 14, 2011

67. JVM
Saturday, May 14, 2011

68. feita pensando em uma
linguagem
(começa com J)
Saturday, May 14, 2011

69. precisa de classes
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70. function Carro
===
class Carro
Saturday, May 14, 2011

71. JVM
no máximo 256 opcodes
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72. simples
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73. Saturday, May 14, 2011

74. ldc
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75. ldc #9
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76. ldc #9 // “Hello World”
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77. ldc #9 // “Hello World”
getstatic
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78. ldc #9 // “Hello World”
getstatic #15
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79. ldc #9 // “Hello World”
getstatic #15 // System.out
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80. ldc #9 // “Hello World”
getstatic #15 // System.out
swap
Saturday, May 14, 2011

81. ldc #9 // “Hello World”
getstatic #15 // System.out
swap
invokevirtual
Saturday, May 14, 2011

82. ldc #9 // “Hello World”
getstatic #15 // System.out
swap
invokevirtual #21
Saturday, May 14, 2011

83. ldc #9 // “Hello World”
getstatic #15 // System.out
swap
invokevirtual #21 // PrintWriter.println()
Saturday, May 14, 2011

84. ldc #9 // “Hello World”
getstatic #15 // System.out
swap
invokevirtual #21 // PrintWriter.println()
return
Saturday, May 14, 2011

85. ZOMG
Saturday, May 14, 2011

86. Estrutura de Invocação
invokestatic
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87. Estrutura de Invocação
invokestatic
A
Saturday, May 14, 2011

88. Estrutura de Invocação
invokestatic
A
Saturday, May 14, 2011

89. Estrutura de Invocação
invokestatic
A B
Saturday, May 14, 2011

90. Estrutura de Invocação
invokevirtual
Saturday, May 14, 2011

91. Estrutura de Invocação
invokevirtual
A
Saturday, May 14, 2011

92. Estrutura de Invocação
invokevirtual
A
Saturday, May 14, 2011

93. Estrutura de Invocação
invokevirtual
A B
Saturday, May 14, 2011

94. Estrutura de Invocação
invokevirtual
A B
C
Saturday, May 14, 2011

95. Estrutura de Invocação
invokevirtual
A B
C
Saturday, May 14, 2011

96. Estrutura de Invocação
invokeinterface
Saturday, May 14, 2011

97. Estrutura de Invocação
invokeinterface
A
Saturday, May 14, 2011

98. Estrutura de Invocação
invokeinterface
A
Saturday, May 14, 2011

99. Estrutura de Invocação
invokeinterface
A
I swear I am B
Saturday, May 14, 2011

100. Estrutura de Invocação
invokeinterface
A
I swear I am B
C
Saturday, May 14, 2011

101. Estrutura de Invocação
invokeinterface
A
I swear I am B
C
Saturday, May 14, 2011

102. Estrutura de Invocação
invokeinterface
A
I swear I am B
C
Saturday, May 14, 2011

103. Estrutura de Invocação
invokeinterface
A
I swear I am B
He is D
(LIAR)
C
Saturday, May 14, 2011

104. e o JavaScript?
Saturday, May 14, 2011

105. Saturday, May 14, 2011

106. function
Saturday, May 14, 2011

107. function
identifier
Saturday, May 14, 2011

108. function
identifier
formal parameter list
Saturday, May 14, 2011

109. function
identifier
formal parameter list
function body
Saturday, May 14, 2011

110. formal parameter list
function body
Saturday, May 14, 2011

111. Saturday, May 14, 2011

112. n body function body functio
n body function body functio
n body function body functio
n body function body functio
n body function body functio
Saturday, May 14, 2011

113. JavaScript
===
um monte de blocos
executáveis
Saturday, May 14, 2011

114. perfeito para
otimização
Saturday, May 14, 2011

115. como resolver?
Saturday, May 14, 2011

116. JDK7
(prevista pra 7/7)
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117. invokedynamic
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118. invokedynamic
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119. invokedynamic
A
Saturday, May 14, 2011

120. invokedynamic
A
C
Saturday, May 14, 2011

121. invokedynamic
A
D
C
Saturday, May 14, 2011

122. invokedynamic
A
D
C
Saturday, May 14, 2011

123. invokedynamic
A
D
C
Saturday, May 14, 2011

124. invokedynamic
A
D
C
Saturday, May 14, 2011

125. invokedynamic
A
D
C
?
Saturday, May 14, 2011

126. invokedynamic
A
D
C
?
Saturday, May 14, 2011

127. invokedynamic
A
D
C
?
Saturday, May 14, 2011

128. invokedynamic
A
D
C
?
Saturday, May 14, 2011

129. mega-alpha
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130. dyn.js
100% invokedynamic js impl
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131. em breve
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132. “Anyway, I know only one
programming language worse
than C and that is JavaScript”
Robert Caillau
Saturday, May 14, 2011

133. Saturday, May 14, 2011

134. ?
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135. Obrigado!
Saturday, May 14, 2011