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Toothpick - A fresh approach to DI (Including Unit Testing)
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Daniel Molinero Reguera
April 11, 2017
Programming
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980
Toothpick - A fresh approach to DI (Including Unit Testing)
Presented at Droidcon Boston 2017
Daniel Molinero Reguera
April 11, 2017
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Transcript
A FRESH APPROACH TO DI TOOTHPICK https://github.com/stephanenicolas/toothpick/
ABOUT US Senior Android Dev @ Groupon ~20 years of
Java coding OSS: Dart, TP, BoundBox, … STEPHANE NICOLAS DANIEL MOLINERO REGUERA Android Dev @ Groupon Turbulence Ninja OSS: Dart, TP. +stephane nicolas @D_Lemures
5IF"OESPJE5FBNJT)JSJOH jobs.groupon.com/careers/
THE TALK WHY DI ? WHY TOOTHPICK? TOOTHPICK FEATURES
SOME EXAMPLES UNIT TESTING CONCLUSION SCOPE MODULES & BINDINGS SCOPE TREE SCOPE SINGLETONS MVP & STATE PRESERVATION MULTIPLE ACTIVITIES FLOWS #DroidConBos | @D_Lemures | @GrouponEng
WHY DI ? #DroidConBos | @D_Lemures
WHY DI ? DECOUPLE #DroidConBos | @D_Lemures
WHY DI ? DECOUPLE USES #DroidConBos | @D_Lemures
WHY DI ? DECOUPLE REUSE USES #DroidConBos | @D_Lemures
WHY DI ? DECOUPLE REUSE USES USES USES #DroidConBos |
@D_Lemures
WHY DI ? DECOUPLE REUSE TEST USES USES USES #DroidConBos
| @D_Lemures
WHY DI ? DECOUPLE REUSE TEST USES USES USES MOCK
USES #DroidConBos | @D_Lemures
WHY TOOTHPICK? #DroidConBos | @D_Lemures
WHY TOOTHPICK? SIMPLER #DroidConBos | @D_Lemures
WHY TOOTHPICK? SIMPLER BETTER TEST SUPPORT #DroidConBos | @D_Lemures
WHY TOOTHPICK? SIMPLER BETTER TEST SUPPORT EVEN FASTER #DroidConBos |
@D_Lemures
TOOTHPICK FEATURES public class SmoothieMachine { @Inject IceMachine iceMachine;
public void doSmoothie() { iceMachine.makeIce(); } } @Singleton public class IceMachine { Foo foo; @Inject public IceMachine(Foo foo) { this.foo = foo; } #DroidConBos | @D_Lemures
TOOTHPICK FEATURES public class SmoothieMachine { @Inject IceMachine iceMachine;
public void doSmoothie() { iceMachine.makeIce(); } } @Singleton public class IceMachine { Foo foo; @Inject public IceMachine(Foo foo) { this.foo = foo; } JSR 330 annotations→nothing new here #DroidConBos | @D_Lemures
TOOTHPICK FEATURES SCOPE SCOPE #DroidConBos | @D_Lemures
TOOTHPICK FEATURES SCOPE SCOPE MAKE INJECTIONS #DroidConBos | @D_Lemures
TOOTHPICK FEATURES SCOPE SCOPE MAKE INJECTIONS public class MyApplication extends
Application { @Inject Machine machine; @Override protected void onCreate() { super.onCreate(); Scope appScope = Toothpick.openScope(this); appScope.installModules(…); Toothpick.inject(this, appScope); } } #DroidConBos | @D_Lemures
TOOTHPICK FEATURES SCOPE, MODULES & BINDINGS SCOPE #DroidConBos | @D_Lemures
TOOTHPICK FEATURES SCOPE, MODULES & BINDINGS SCOPE BINDINGS #DroidConBos |
@D_Lemures
TOOTHPICK FEATURES SCOPE, MODULES & BINDINGS SCOPE BINDINGS MODULES #DroidConBos
| @D_Lemures
TOOTHPICK FEATURES SCOPE, MODULES & BINDINGS SCOPE BINDINGS MODULES public
class MyApplication extends Application { @Inject Machine machine; @Override protected void onCreate() { super.onCreate(); Scope appScope = Toothpick.openScope(this); appScope.installModules(new Module() {{ bind(Machine.class).to(IceMachine.class); }}); Toothpick.inject(this, appScope); } } #DroidConBos | @D_Lemures
TOOTHPICK FEATURES APPLICATION SCOPE ACTIVITY 1 SCOPE SCOPE TREE #DroidConBos
| @D_Lemures
TOOTHPICK FEATURES APPLICATION SCOPE SCOPE TREE #DroidConBos | @D_Lemures
TOOTHPICK FEATURES APPLICATION SCOPE ACTIVITY 2 SCOPE SCOPE TREE #DroidConBos
| @D_Lemures
TOOTHPICK FEATURES APPLICATION SCOPE ACTIVITY 2 SCOPE SERVICE 1 SCOPE
SCOPE TREE #DroidConBos | @D_Lemures
TOOTHPICK FEATURES APPLICATION SCOPE ACTIVITY 2 SCOPE SERVICE 1 SCOPE
FRAGMENT 1 SCOPE SCOPE TREE #DroidConBos | @D_Lemures
TOOTHPICK FEATURES APPLICATION SCOPE ACTIVITY 2 SCOPE SERVICE 1 SCOPE
FRAGMENT 1 SCOPE FRAGMENT 2 SCOPE SCOPE TREE #DroidConBos | @D_Lemures
TOOTHPICK FEATURES APPLICATION SCOPE ACTIVITY 2 SCOPE SERVICE 1 SCOPE
FRAGMENT 3 SCOPE FRAGMENT 1 SCOPE FRAGMENT 2 SCOPE SCOPE TREE #DroidConBos | @D_Lemures
TOOTHPICK FEATURES public class LemonActivity extends Activity { @Inject Machine
machine; @Inject Context context; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Scope scope = Toothpick.openScopes(getApplication(), this); scope.installModules(new Module() {{ bind(Context.class).toInstance(this); }}); Toothpick.inject(this, scope); } } SCOPE TREE #DroidConBos | @D_Lemures
TOOTHPICK FEATURES public class LemonActivity extends Activity { @Inject Machine
machine; @Inject Context context; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Scope scope = Toothpick.openScopes(getApplication(), this); scope.installModules(new Module() {{ bind(Context.class).toInstance(this); }}); Toothpick.inject(this, scope); } } SCOPE TREE APPLICATION SCOPE ACTIVITY SCOPE #DroidConBos | @D_Lemures
TOOTHPICK FEATURES APPLICATION SCOPE ACTIVITY SCOPE SCOPE SINGLETONS #DroidConBos |
@D_Lemures
TOOTHPICK FEATURES APPLICATION SCOPE ACTIVITY SCOPE APP SINGLETONS SCOPE SINGLETONS
#DroidConBos | @D_Lemures
TOOTHPICK FEATURES APPLICATION SCOPE ACTIVITY SCOPE APP SINGLETONS ACTIVITY SINGLETONS
SCOPE SINGLETONS #DroidConBos | @D_Lemures
TOOTHPICK FEATURES public class Module extends Module { public Module()
{ bind(Machine.class).toInstance(new Ice Machine()); } } SCOPE SINGLETONS SINGLETONS CAN BE DEFINED IN MODULES #DroidConBos | @D_Lemures
TOOTHPICK FEATURES @Singleton public class IceMachine { } @ActivitySingleton public
class SmoothieMachine { } APPLICATION SCOPE ACTIVITY SCOPE SCOPE SINGLETONS OR USING ANNOTATIONS #DroidConBos | @D_Lemures
SOME EXAMPLES MVP & STATE PRESERVATION #DroidConBos | @D_Lemures
APPLICATION SCOPE MVP & STATE PRESERVATION ACTIVITY SCOPE SOME EXAMPLES
#DroidConBos | @D_Lemures
APPLICATION SCOPE MVP & STATE PRESERVATION ACTIVITY SCOPE SOME EXAMPLES
#DroidConBos | @D_Lemures
APPLICATION SCOPE PRESENTER SCOPE MVP & STATE PRESERVATION ACTIVITY SCOPE
SOME EXAMPLES #DroidConBos | @D_Lemures
PRESENTER INSTANCE APPLICATION SCOPE PRESENTER SCOPE MVP & STATE PRESERVATION
ACTIVITY SCOPE SOME EXAMPLES #DroidConBos | @D_Lemures
PRESENTER INSTANCE APPLICATION SCOPE PRESENTER SCOPE MVP & STATE PRESERVATION
SOME EXAMPLES #DroidConBos | @D_Lemures
PRESENTER INSTANCE APPLICATION SCOPE PRESENTER SCOPE MVP & STATE PRESERVATION
ACTIVITY SCOPE SOME EXAMPLES #DroidConBos | @D_Lemures
MVP & STATE PRESERVATION public class MyActivity extends Activity {
@Inject MyPresenter presenter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Scope scope = openScopes(getApplication(), PresenterSingleton.class, this); Toothpick.inject(this, scope); } } SOME EXAMPLES #DroidConBos | @D_Lemures
@PresenterSingleton public class MyPresenter { String dealId; int quantity; }
PRESENTER SCOPE MVP & STATE PRESERVATION SOME EXAMPLES #DroidConBos | @D_Lemures
ACTIVITY 1 ACTIVITY 3 ACTIVITY 2 MULTI ACTIVITY FLOWS SOME
EXAMPLES #DroidConBos | @D_Lemures
ACTIVITY 1 ACTIVITY 3 ACTIVITY 2 MULTI ACTIVITY FLOWS Purchase
Flow SOME EXAMPLES #DroidConBos | @D_Lemures
ACTIVITY 1 ACTIVITY 3 ACTIVITY 2 MULTI ACTIVITY FLOWS Purchase
Flow SOME EXAMPLES #DroidConBos | @D_Lemures
ACTIVITY 1 ACTIVITY 3 ACTIVITY 2 MULTI ACTIVITY FLOWS SOME
EXAMPLES #DroidConBos | @D_Lemures
ACTIVITY 1 ACTIVITY 3 ACTIVITY 2 MULTI ACTIVITY FLOWS SOME
EXAMPLES #DroidConBos | @D_Lemures
ACTIVITY 1 ACTIVITY 3 ACTIVITY 2 MULTI ACTIVITY FLOWS SOME
EXAMPLES #DroidConBos | @D_Lemures
ACTIVITY 1 ACTIVITY 3 ACTIVITY 2 MULTI ACTIVITY FLOWS SOME
EXAMPLES #DroidConBos | @D_Lemures
APPLICATION SCOPE ACTIVITY 1 SCOPE FLOW SCOPE MULTI ACTIVITY FLOWS
SOME EXAMPLES #DroidConBos | @D_Lemures
APPLICATION SCOPE ACTIVITY 1 SCOPE FLOW SCOPE MULTI ACTIVITY FLOWS
SOME EXAMPLES #DroidConBos | @D_Lemures
APPLICATION SCOPE ACTIVITY 1 SCOPE FLOW SCOPE ACTIVITY 2 SCOPE
MULTI ACTIVITY FLOWS SOME EXAMPLES #DroidConBos | @D_Lemures
APPLICATION SCOPE ACTIVITY 1 SCOPE FLOW SCOPE ACTIVITY 3 SCOPE
ACTIVITY 2 SCOPE MULTI ACTIVITY FLOWS SOME EXAMPLES #DroidConBos | @D_Lemures
APPLICATION SCOPE FLOW SCOPE MULTI ACTIVITY FLOWS SOME EXAMPLES #DroidConBos
| @D_Lemures
APPLICATION SCOPE MULTI ACTIVITY FLOWS SOME EXAMPLES #DroidConBos | @D_Lemures
MVP & STATE PRESERVATION public class MyActivity extends Activity {
@Inject ShoppingCart shoppingCart; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Scope scope = openScopes(getApplication(), FlowSingleton.class, this); Toothpick.inject(this, scope); } } SOME EXAMPLES #DroidConBos | @D_Lemures
@FlowSingleton public class ShoppingCart { List<PurchaseItem> purchases… } FLOW SCOPE
MULTI ACTIVITY FLOWS SOME EXAMPLES #DroidConBos | @D_Lemures
UNIT TESTING WE TEST UNITS #DroidConBos | @D_Lemures
UNIT TESTING WE TEST UNITS MOCK USES WE MOCK DEPENDENCIES
#DroidConBos | @D_Lemures
UNIT TESTING public class SmoothieMachine { @Inject IceMachine iceMachine; @Inject
SyrupDispenser syrupDispenser; public void doSmoothie() { Smoothie smoothie = iceMachine.makeIce(); syrupDispenser.addSyrup(smoothie); return smoothie; } } WE WANT TO SIMULATE THE DEPENDENCIES #DroidConBos | @D_Lemures
UNIT TESTING public class TestSmoothieMachine extends EasyMockSupport { @Rule public
EasyMockRule easyMockRule = new EasyMockRule(this); @Mock IceMachine iceMachineMock; @Mock SyrupDispenser syrupDispenserMock; @Mock Smoothie smoothieMock; @Test public void doSmoothie_should_createSmoothie() { // GIVEN expect(iceMachineMock.makeIce()).andReturn(smoothieMock); syrupDispenserMock.addSyrup(smoothieMock); replayAll(); // WHEN Smoothie smoothie = smoothieMachine.doSmoothie(); // THEN assertThat(smoothie, sameInstance(smoothieMock)); verifyAll(); } } 1. CREATE MOCKS -> EASYMOCK #DroidConBos | @D_Lemures
UNIT TESTING public class TestSmoothieMachine extends EasyMockSupport { @Rule public
EasyMockRule easyMockRule = new EasyMockRule(this); @Rule public ToothPickRule toothPickRule = new ToothPickRule(this, “testScope”); @Mock IceMachine iceMachineMock; @Mock SyrupDispenser syrupDispenserMock; @Mock Smoothie smoothieMock; @Inject SmoothieMachine classUnderTest; @Test public void doSmoothie_should_createSmoothie() { // GIVEN expect(iceMachineMock.makeIce()).andReturn(smoothieMock); syrupDispenserMock.addSyrup(smoothieMock); replayAll(); // WHEN toothPickRule.inject(this); Smoothie smoothie = smoothieMachine.doSmoothie(); // THEN assertThat(smoothie, sameInstance(smoothieMock)); verifyAll(); } } 2. INJECT MOCKS -> TOOTHPICK #DroidConBos | @D_Lemures
CONCLUSION QUESTIONS ? COMMENTS ? #DroidConBos | @D_Lemures | @GrouponEng
CONCLUSION QUESTIONS ? COMMENTS ? #DroidConBos | @D_Lemures | @GrouponEng
A FRESH APPROACH TO DI TOOTHPICK https://github.com/stephanenicolas/toothpick/ +stephane nicolas @D_Lemures