Eway google-guice presentation
Download as PPTX, PDF0 likes370 views
The document discusses Google Guice, a dependency injection framework that simplifies Java code by reducing the need for factories and the 'new' keyword. It covers key concepts such as modules, binding types, injection methods, and scopes, along with practical examples and demo steps for implementation. Additionally, it provides references to source code for further exploration.
Eway google-guice presentation
- 1. Google Guice Dependency Injection VŨ CÔNG THÀNH Tech Core team
- 2. Agenda • Dependency Injection? YES/NO • Google Guice Introduction • Google Guice : HOW? • Module • Binding • Scope • Injection (Constructor, Field, and Method) • Graph • Demo • Q & A
- 3. 3 Dependency Injection class SAMSUNG_S3() { SAMSUNG_S3() { ISpeaker s = new Speaker(); IMicro m = new Micro(); IScreen s = new Screen(); IKeyboard k = new Keyboard(); ... IHardDrive hd = new HardDrive(); IGraphicMemory gm = new GraphicMemory(); IGraphicCard g = new GraphicCard(gm); ICPU c = new CPU(); //And finally!!! samsungS3 = new Phone(s,m,g, c,…, ... ); } } Spagetti Code
- 4. 4 Dependency Injection class IPhone() { IPhone() { ISpeaker s = new Speaker(); IMicro m = new Micro(); IScreen s = new Screen(); IKeyboard k = new Keyboard(); ... IHardDrive hd = new HardDrive(); IGraphicMemory gm = new GraphicMemory(); IGraphicCard g = new GraphicCard(gm); ICPU c = new CPU(); //And finally!!! iphone = new Phone(s,m,g, c,…, ... ); } } How many “new” in your application? Wild Programmer
- 6. 6 Google Guice • Guice is a dependency injection framework, which alleviates the need for factories and use of new in your java code. • Google Guice implements the JSR-330 • Above Java 5 and brought to you by Google.
- 7. 7 Google Guice • Guice Module • Binding • Scope • Injection (Constructor, Field, and Method) • Graph
- 8. 8 Guice Module • Binding: Interface -> Implementation public class RDBMSRewardBinder extends AbstractModule { @Override protected void configure() { //Advertiser bind(AdvertisersService.class).to(AdvertisersServiceImpl.class); bind(AdvertisersStorage.class).to(AdvertisersJPAImpl.class); bind(AdvertiserUsersService.class).to(AdvertiserUsersServiceImpl.class); bind(AdvertiserUsersStorage.class).to(AdvertiserUsersJPAImpl.class); //user bind(UsersService.class).to(UsersServiceImpl.class); bind(UserDevicesService.class).to(UserDevicesServiceImpl.class); bind(UsersStorage.class).to(UsersJPAImpl.class); bind(UserDevicesStorage.class).to(UserDevicesJPAImpl.class); bind(UserStatusLogsStorage.class).to(UserStatusLogsJPAImpl.class); bind(UserRefreshTokenService.class).to(UserRefreshTokenServiceImpl.class); bind(UserRefreshTokensStorage.class).to(UserRefreshTokensJPAImpl.class); ...
- 9. 9 Binding Types • Multi Binding: public class RequestLifecycleBinder1 extends AbstractModule { @Override protected void configure() { Multibinder<ComponentRequestLifecycle> multibinder = Multibinder.newSetBinder(binder(), ComponentRequestLifecycle.class); multibinder.addBinding().to(DBRequestLifecycle.class); multibinder.addBinding().to(NoSQLRequestLifecycle.class); } } class RequestLifecycleStack extends LinkedList<RequestLifecycle> { @Inject private Set<ComponentRequestLifecycle> allComponents;
- 10. 10 Scope • Unscoped: one per use • create it, use it, and destroy it. • Singleton: one per application • For heavyweight resources • and application state.
- 11. 11 Scope • Multi Binding public class RequestLifecycleBinder1 extends AbstractModule { @Override protected void configure() { Multibinder<ComponentRequestLifecycle> multibinder = Multibinder.newSetBinder(binder(), ComponentRequestLifecycle.class); multibinder.addBinding().to(DBRequestLifecycle.class); multibinder.addBinding().to(NoSQLRequestLifecycle.class); } } class RequestLifecycleStack extends LinkedList<RequestLifecycle> { @Inject private Set<ComponentRequestLifecycle> allComponents;
- 12. 12 Demo • Step 0: Using ‘new’ in order to create the RewardApp • Step 1: Creates Module and Binding • A module is a collection of bindings which is passed to Injector on its creation • Step 2: Multi Binding • Step 3: Binding with annotation and Singleton scope • Step 4: JsonModule and Binding from Json
- 13. 13 Demo • Step 5: Graph Objects
- 14. 14 References • Source Code: • https://github.com/thanhvc/guice-demo • https://github.com/google/guice/wiki/GettingStart ed
- 15. Q&A