Ruby on Rails e o Mercado
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Transcript of Ruby on Rails e o Mercado
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?O que ganho ao utilizarRuby on Rails?
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ágildesenvolvimentomanutenção{
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?Como ganho esta agilidade?
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Ruby on Rails
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Ruby on Rails
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Ruby on Rails{ {
linguagem deprogramação
framework dedesenvolvimento
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{ {
linguagem deprogramação
framework dedesenvolvimento
on
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• Tecnologia japonesa
• Lançada em 1995
• O “Python” oriental
• Ênfase na simplicidadee na elegância
• Código aberto,gratuito e sem restrições Arquiteto do Ruby,
Yukihiro “Matz” Matsumoto
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Características Técnicas
• Orientado a objeto
• Tudo é um objeto (diferente de Java, Python e Perl)
• Herança única, com extensão por módulos
• Possibilidade de adicionar programação em runtime
• Traços de orientação a aspectos
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Influências por linguagem
• Linguagem prática (Perl)
• Orientação a objetos (Smalltalk)
• Metaprogramação (Smalltalk)
• Sintaxe (Smalltalk, Eiffel e Ada)
• Tratamento de exceções (Java e Python)
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Dica para pergunta inicial:
Ruby é simples, elegante e “menos máquina”
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9º lugarno ranking TPCI
TIOBE Programming Community Index
(3,089%)
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15,6%dos programadores brasileiros já sabem Ruby
Fonte: Evans Data, INFO Exame 08/2007
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33%dos programadores brasileiros esperam
aprender até 2008Fonte: Evans Data, INFO Exame 08/2007
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98%dos participantes desta palestra vão trabalhar
com Rails dentro de até 4 anos
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Framework paraaplicações web
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Template paraaplicações web
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• Extração do Basecamp, da 37signals
• Desenvolvido para o mundo real
• Completo, eficiente, extensível
• Código aberto, gratuito e sem restrições
• MVC + Helpers
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Sinceramente, não é um framework.É um metaframework.
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ActiveRecordActionPackActionMailer
ActiveSupport
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“Já vem pronto”
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TOP SECRETArma secreta do Rails:
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Conventionover
Configuration
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Você usa o que o Rails sugere...
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Você usa o que o Rails sugere...
e, em troca, você não precisa configurar nada.
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Você usa o que o Rails sugere...
e, em troca, você não precisa configurar nada.
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Tradução de Convention over Configuration:
convenção ao invés de configuração
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Tradução de Convention over Configurationpara desenvolvedores:
menos código
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Tradução de Convention over Configurationpara clientes:
menos tempo
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Tradução de Convention over Configurationpara vendedores:
maior lucro
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Como Convention over Configuration me traz vantagem?
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Antes:
90%: programação10%: desenho do projeto
Exemplo: 4 horas de desenho do projeto, 36 horas de programação.Total de 40 horas.
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Com o Rails:
60%: programação40%: desenho do projeto
Exemplo: 6 horas de desenho do projeto, 9 horas de programação.Total de 15 horas.
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Exemplo rápido
• No desenho do projeto:– Um “Cliente” tem vários “Carros”
a client has many cars
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Exemplo rápido
• No desenho do projeto:– Um “Cliente” tem vários “Carros”
a client has many cars
• Na programação do Rails: class Client has_many :cars (...)
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+
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+Metaprogramação
Geração de código em RuntimeSimplicidade
Elegância...
Convention over ConfigurationMVC + HelpersFocado no mundo realExtendability...
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+
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+
ágildesenvolvimentomanutenção{
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Quem já está nos trilhos do Ruby on Rails?
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Peixes Grandes
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• Implementação do Ruby em cima do Java
• Possibilidade de executar código Ruby na máquina virtual do Java
• Compilação de código Ruby para .class (bytecode Java)
• Já estável e em utilização
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• Suporte a Java (claro), C/C++ e Ruby!
• Investimento pesado no desenvolvimento da IDE
• O mais completo “code completion” entre todas as IDEs
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Microsoft IronRuby
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• Código Ruby em cima do framework .NET
• Atualmente em desenvolvimento (pre-alpha)
Microsoft IronRuby
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Ruby e Ruby on Rails inclusos no
Mac OS X Leopard
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National Museum of African American
History and Culture
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Jeff Bezos, fundador da Amazon
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Peixes pequenos
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• Sistema de microblogging
• Aplicação 100% em Ruby on Rails
• Diversas APIs, integração com SMS, mensagem instantânea (GTalk), etc...
• 11.000 hits per second
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• Integração de blogs brasileiros.
• Sistema também 100% Ruby on Rails
• Desenvolvimento em 4 dias
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• Palestras, reuniões, aulas e eventos online
• Streaming de webcam, voz e desktop sharing
• Ruby on Rails + Flex + Flash Media Server
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$
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Nos Estados Unidos:Média do salário de programador Ruby on Rails
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Nos Estados Unidos:Média do salário de programador Ruby on Rails
US$ 5.000,00
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Nos Estados Unidos:Média do salário de programador Ruby on Rails
Lead + Software Engineer
US$ 30.000,00
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No Reino Unido:Média do salário de programador Ruby on Rails
£ 3.000,00
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No Reino Unido:280 vagas em aberto
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Desenvolvedores Rails pelo mundo
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1. EUA, com 2100
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1. EUA, com 2100
2. Reino Unido, com 401
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1. EUA, com 2100
2. Reino Unido, com 401
3. Brasil, com 333
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1. EUA, com 2100
2. Reino Unido, com 401
3. Brasil, com 333
...
Total: 9373
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A hora certa é agora!