Comparing Spring & Guice

Transcription

1 Comparing Spring & Guice Bill Dudney Dudney.net Bill Dudney Comparing Spring & Guice Slide 1

2 Dependency Injection WarpSimulator capacitor : FluxCapacitor simulate() : void <<interface>> FluxCapacitor capacitate() : void Mark1Capcitor capacitate() : void Mark2Capcitor capacitate() : void Bill Dudney Comparing Spring & Guice Slide 2

3 Dependency Creation Bill Dudney Comparing Spring & Guice Slide 3

4 Dependency Passing Bill Dudney Comparing Spring & Guice Slide 4

5 Doesn t help... Bill Dudney Comparing Spring & Guice Slide 5

6 Abstract Factory Service capacitate() : void fluxify() : void AbstractFactory createservice() AbstractFactory : Service createmanager() : Manager createservice() : Service createmanager() : Manager Manager MockService MockFactory RealService capacitate() createservice() : void : Service capacitate() : void fluxify() : createmanager() void : Manager fluxify() : void capacitate() RealFactory : void fluxify() : void createservice() : Service createmanager() : Manager RealManager capacitate() : void fluxify() : void MockManager capacitate() : void fluxify() : void Bill Dudney Comparing Spring & Guice Slide 6

7 Service Locator ServiceLocator findservice1() : Service1 uses JndiContext lookup(name : String) : Object Service1 capacitate() : void fluxify() : void uses ServiceFactory getservice1() : Service1 lookup or create Service1Impl capacitate() : void fluxify() : void Bill Dudney Comparing Spring & Guice Slide 7

8 Another Way Dependency Injector connect(interface : Object, destination : Object, method Method) : void WarpSimulator capacitor : FluxCapacitor simulate() : void <<interface>> FluxCapacitor capacitate() : void Mark1Capcitor capacitate() : void Mark2Capcitor capacitate() : void Bill Dudney Comparing Spring & Guice Slide 8

9 Demo Design Bill Dudney Comparing Spring & Guice Slide 9

10 Demo Design Model Account number : String user : User User name : String password : String Bill Dudney Comparing Spring & Guice Slide 10

11 Demo Design Service AccountService createnewaccount(name : String, passwd : String) : Account Bill Dudney Comparing Spring & Guice Slide 11

12 Demo Design DAO AccountDAO getaccount(number : String) : Account createaccount(user:user) : Account UserDAO getuser(username : String) : User createuser(name : String, passwd : String) : User Bill Dudney Comparing Spring & Guice Slide 12

13 Spring Mission Statement Java EE Should be Easier It s best to program to interfaces JavaBeans offer a great way to config apps OO Design is more important than a tech Checked Exceptions are over used Testability is essential Bill Dudney Comparing Spring & Guice Slide 13

14 Spring Kickstart Bill Dudney Comparing Spring & Guice Slide 14

15 Spring Mission Statement Java EE Should be Easier It s best to program to interfaces JavaBeans offer a great way to config apps OO Design is more important than a tech Checked Exceptions are over used Testability is essential Bill Dudney Comparing Spring & Guice Slide 15

16 Spring Context public static void main( String[] args ) { ApplicationContext context = new ClassPathXmlApplicationContext("appCtx.xml"); AccountService service = (AccountService)context. getbean("accountservice"); Account act = service.createnewaccount("bill", "1234"); System.err.println("account = " + act); } Bill Dudney Comparing Spring & Guice Slide 16

17 Spring Context public static void main( String[] args ) { ApplicationContext context = new ClassPathXmlApplicationContext("appCtx.xml"); AccountService service = (AccountService)context. getbean("accountservice"); Account act = service.createnewaccount("bill", "1234"); System.err.println("account = " + act); } Bill Dudney Comparing Spring & Guice Slide 17

18 Spring Context public static void main( String[] args ) { ApplicationContext context = new ClassPathXmlApplicationContext("appCtx.xml"); AccountService service = (AccountService)context. getbean("accountservice"); Account act = service.createnewaccount("bill", "1234"); System.err.println("account = " + act); } Bill Dudney Comparing Spring & Guice Slide 18

19 Spring Context public static void main( String[] args ) { ApplicationContext context = new ClassPathXmlApplicationContext("appCtx.xml"); AccountService service = (AccountService)context. getbean("accountservice"); Account act = service.createnewaccount("bill", "1234"); System.err.println("account = " + act); } Bill Dudney Comparing Spring & Guice Slide 19

20 Account Service public interface AccountService { public Account createnewaccount(string username, String password); } Bill Dudney Comparing Spring & Guice Slide 20

21 Account Service Impl public class AccountServiceImpl implements AccountService { private final AccountDAO accountdao; private final UserDAO userdao; public AccountServiceImpl(AccountDAO accountdao, UserDAO userdao) { super(); this.accountdao = accountdao; this.userdao = userdao; } Bill Dudney Comparing Spring & Guice Slide 21

22 Account Service Impl public Account createnewaccount(string username, String password) { User user = userdao.getuser(username); if(null == user) { user = userdao.createuser(username, password); } Account account = accountdao.createaccount(user); return account; } Bill Dudney Comparing Spring & Guice Slide 22

23 Spring XML <beans> <bean id="userdao" class="com.css.dudney.examples.userdaoimpl" /> <bean id="accountdao" class="com.css.dudney.examples.accountdaoimpl" /> <bean id="accountservice" class="com.css.dudney.examples.accountserviceimpl"> <constructor-arg ref="accountdao"></constructor-arg> <constructor-arg ref="userdao"></constructor-arg> </bean> </beans> Bill Dudney Comparing Spring & Guice Slide 23

24 Guice Uses Annotations for Configuration Bill Dudney Comparing Spring & Guice Slide 24

25 Guice Kickstart Bill Dudney Comparing Spring & Guice Slide 25

26 Guice Bill Dudney Comparing Spring & Guice Slide 26

27 Guice Module public static void main( String[] args ) { GuiceModule module = new GuiceModule(); Injector injector = Guice.createInjector(module); AccountService service = injector. getinstance(accountservice.class); Account act = service.createnewaccount("bill", "1234"); System.err.println("account = " + act); } Bill Dudney Comparing Spring & Guice Slide 27

28 Guice Module public static void main( String[] args ) { GuiceModule module = new GuiceModule(); Injector injector = Guice.createInjector(module); AccountService service = injector. getinstance(accountservice.class); Account act = service.createnewaccount("bill", "1234"); System.err.println("account = " + act); } Bill Dudney Comparing Spring & Guice Slide 28

29 Guice Module public static void main( String[] args ) { GuiceModule module = new GuiceModule(); Injector injector = Guice.createInjector(module); AccountService service = injector. getinstance(accountservice.class); Account act = service.createnewaccount("bill", "1234"); System.err.println("account = " + act); } Bill Dudney Comparing Spring & Guice Slide 29

30 Guice Module public static void main( String[] args ) { GuiceModule module = new GuiceModule(); Injector injector = Guice.createInjector(module); AccountService service = injector. getinstance(accountservice.class); Account act = service.createnewaccount("bill", "1234"); System.err.println("account = " + act); } Bill Dudney Comparing Spring & Guice Slide 30

31 Guice Module public static void main( String[] args ) { GuiceModule module = new GuiceModule(); Injector injector = Guice.createInjector(module); AccountService service = injector. getinstance(accountservice.class); Account act = service.createnewaccount("bill", "1234"); System.err.println("account = " + act); } Bill Dudney Comparing Spring & Guice Slide 31

32 Account public interface AccountService { public Account createnewaccount(string username, String password); } Bill Dudney Comparing Spring & Guice Slide 32

33 Account Service Impl public class AccountServiceImpl implements AccountService { private final AccountDAO accountdao; private final UserDAO public AccountServiceImpl(AccountDAO accountdao, UserDAO userdao) { super(); this.accountdao = accountdao; this.userdao = userdao; } Bill Dudney Comparing Spring & Guice Slide 33

34 Guice Module public class GuiceModule implements Module { public void configure(binder binder) { binder.bind(accountdao.class).to(accountdaoimpl.class). in(scopes.singleton); binder.bind(userdao.class).to(userdaoimpl.class). in(scopes.singleton); binder.bind(accountservice.class).to (AccountServiceImpl.class). in(scopes.singleton); } } Bill Dudney Comparing Spring & Guice Slide 34

35 Multiple Implementations Bill Dudney Comparing Spring & Guice Slide 35

36 Parameter public AccountDAO accountdao, UserDAO userdao) { super(); this.accountdao = accountdao; this.userdao = userdao; } Bill Dudney Comparing Spring & Guice Slide 36

37 Field private AccountDAO accountdao; Bill Dudney Comparing Spring & Guice Slide 37

38 Parameter public AccountDAO accountdao, UserDAO userdao) { super(); this.accountdao = accountdao; this.userdao = userdao; } Bill Dudney Comparing Spring & Guice Slide 38

39 Guice Module public class GuiceModule implements Module { public void configure(binder binder) { binder.bind(accountdao.class).to(accountdaoimpl.class). in(scopes.singleton); binder.bind(userdao.class).to(userdaoimpl.class). in(scopes.singleton); binder.bind(accountservice.class).to (AccountServiceImpl.class). in(scopes.singleton); binder.bind(accountdao.class).annotatedwith (Other.class) to(accountdaoimpl.class).in(scopes.singleton); } } Bill Dudney Comparing Spring & Guice Slide 39

40 Other { } Bill Dudney Comparing Spring & Guice Slide 40

41 Testing Spring Different XML Guice Different Module Bill Dudney Comparing Spring & Guice Slide 41

42 Comparing Guice and Spring are very different Guice is DI Spring is DI and a bunch more Bill Dudney Comparing Spring & Guice Slide 42

43 Spring Pro s Mature Very Widely Deployed Lots of Resource and People Bill Dudney Comparing Spring & Guice Slide 43

44 Spring Con s Editing XML gets old No type saftey Spelunking can be difficult Bill Dudney Comparing Spring & Guice Slide 44

45 Guice Pro s Type Safety for bindings Faster to bind Spelunking is simpler Bill Dudney Comparing Spring & Guice Slide 45

46 Guice Con s Not widely deployed Not many resources Not many people that know it Not as widely integrated Bill Dudney Comparing Spring & Guice Slide 46

47 Conclusion Bill Dudney Comparing Spring & Guice Slide 47