#107 Dependency Injection example JavaDoc

This commit is contained in:
Ilkka Seppala 2015-08-18 22:17:16 +03:00
parent 10a911be54
commit e71f2279f0
6 changed files with 21 additions and 12 deletions

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@ -9,23 +9,27 @@ import com.google.inject.Injector;
* implements so called inversion of control principle. Inversion of control has two specific rules: * implements so called inversion of control principle. Inversion of control has two specific rules:
* - High-level modules should not depend on low-level modules. Both should depend on abstractions. * - High-level modules should not depend on low-level modules. Both should depend on abstractions.
* - Abstractions should not depend on details. Details should depend on abstractions. * - Abstractions should not depend on details. Details should depend on abstractions.
* * <p>
* In this example we show you three different wizards. The first one (SimpleWizard) is a naive * In this example we show you three different wizards. The first one ({@link SimpleWizard}) is a naive
* implementation violating the inversion of control principle. It depends directly on a concrete * implementation violating the inversion of control principle. It depends directly on a concrete
* implementation which cannot be changed. * implementation which cannot be changed.
* * <p>
* The second wizard (AdvancedWizard) is more flexible. It does not depend on any concrete implementation * The second wizard ({@link AdvancedWizard}) is more flexible. It does not depend on any concrete implementation
* but abstraction. It utilizes Dependency Injection pattern allowing its Tobacco dependency to be * but abstraction. It utilizes Dependency Injection pattern allowing its {@link Tobacco} dependency to be
* injected through its constructor. This way, handling the dependency is no longer the wizard's * injected through its constructor. This way, handling the dependency is no longer the wizard's
* responsibility. It is resolved outside the wizard class. * responsibility. It is resolved outside the wizard class.
* * <p>
* The third example takes the pattern a step further. It uses Guice framework for Dependency Injection. * The third example takes the pattern a step further. It uses Guice framework for Dependency Injection.
* TobaccoModule binds a concrete implementation to abstraction. Injector is then used to create * {@link TobaccoModule} binds a concrete implementation to abstraction. Injector is then used to create
* GuiceWizard object with correct dependencies. * {@link GuiceWizard} object with correct dependencies.
* *
*/ */
public class App { public class App {
/**
* Program entry point
* @param args command line args
*/
public static void main( String[] args ) { public static void main( String[] args ) {
SimpleWizard simpleWizard = new SimpleWizard(); SimpleWizard simpleWizard = new SimpleWizard();
simpleWizard.smoke(); simpleWizard.smoke();

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@ -2,7 +2,7 @@ package com.iluwatar.dependency.injection;
/** /**
* *
* OldTobyTobacco concrete Tobacco implementation * OldTobyTobacco concrete {@link Tobacco} implementation
* *
*/ */
public class OldTobyTobacco extends Tobacco { public class OldTobyTobacco extends Tobacco {

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@ -2,7 +2,7 @@ package com.iluwatar.dependency.injection;
/** /**
* *
* RivendellTobacco concrete Tobacco implementation * RivendellTobacco concrete {@link Tobacco} implementation
* *
*/ */
public class RivendellTobacco extends Tobacco { public class RivendellTobacco extends Tobacco {

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@ -2,7 +2,7 @@ package com.iluwatar.dependency.injection;
/** /**
* *
* SecondBreakfastTobacco concrete Tobacco implementation * SecondBreakfastTobacco concrete {@link Tobacco} implementation
* *
*/ */
public class SecondBreakfastTobacco extends Tobacco { public class SecondBreakfastTobacco extends Tobacco {

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@ -4,7 +4,7 @@ import com.google.inject.AbstractModule;
/** /**
* *
* Guice module for binding certain concrete Tobacco implementation. * Guice module for binding certain concrete {@link Tobacco} implementation.
* *
*/ */
public class TobaccoModule extends AbstractModule { public class TobaccoModule extends AbstractModule {

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@ -4,6 +4,11 @@ import org.junit.Test;
import com.iluwatar.dependency.injection.App; import com.iluwatar.dependency.injection.App;
/**
*
* Application test
*
*/
public class AppTest { public class AppTest {
@Test @Test