Google guiceGoogle guice

It’s easy It’s easy

© Skelia 2011

Agenda

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●Pattern Dependency injection

●Why we need DI●Google guice introduction●Guice simple injection ●Integration with Servlets ●Integration with Guice●Philosophy●Instead of summary●Q&A

DI or Don't Call Me, I Will Call You

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● Dependency injection (DI) in object-oriented computer programming is a technique that indicates to a part of a program which other parts it can use, i.e. to supply an external dependency – a reference – to a software component. In technical terms, it is a design pattern that separates behavior from dependency resolution, thus decoupling highly dependent components.

Wikipedia: http://en.wikipedia.org/wiki/Dependency_injection

DI or Don't Call Me, I Will Call You

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● Dependency injection (DI) in object-oriented computer programming is a technique that indicates to a part of a program which other parts it can use, i.e. to supply an external dependency – a reference – to a software component. In technical terms, it is a design pattern that separates behavior from dependency resolution, thus decoupling highly dependent components.

Wikipedia: http://en.wikipedia.org/wiki/Dependency_injection

DI or Don't Call Me, I Will Call You

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DI or Don't Call Me, I Will Call You

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Wild programmer

Spaghetti Architecture

Google Guice

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Google-Guice

Current version 3.0

Guice (pronounced 'juice') is a lightweight dependency injection framework for Java 5 and

above, brought to you by Google.

Google Guice

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Google Guice (Module)

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Module Types:•Non-obvious

•AbstractModule

•ServletModule

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Binding types:

• Bind implementationbind(PaymentCashImpl.class)

•Bind implementation to interface bind(Payment.class).to(PaymentCardImpl.class)

•Bind multiple implementation to interfacebind(Payment.class).annotatedWith(Cash.class).to(PaymentCashImpl.class)

bind(Payment.class).annotatedWith(Names.named("Cash")).to(PaymentCashImpl.class)

Google Guice (Binding)

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Google Guice (Injection)

Injection types :

• Constructor

• Method

• Field (not recommended)

@Injectprivate @Card Payment payment;

@Named("PaymentType")@Injectprivate String text;

Google Guice (Provides)

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public class PayModule extends AbstractModule{   protected void configure() {    }

    @Provides    Payment providePayment(){        CashPayment pay = new CashPayment();        pay.setAmount(100);        return pay;    }@Provides List<String> providesListOfString() { return new ArrayList<String>();

}

@Injectpublic void setList(List<String> list)

Google Guice (Scope)

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Google Guice (AOP)

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Google Guice (Sample)

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Google Guice (Servlet integration)

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Google Guice (Sample)

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Google Guice (Integration)

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MobileRoboGuice - Guice for Android.

Other Languages•Groovy-Guice - Groovy•Ninject - .NET•Snake Guice - Python•Smartypants-IOC - Flex/AS3•Dawn - AS3

Google Guice (Integration)

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Google Guice (philosophy)

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Google Guice (philosophy)

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Instead of Conclusion

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Thank you !