task: di function demo

Author: wynn5a

di-function-sample/src/test/java/ComponentConstructionTest.java

@@ -2,6 +2,10 @@
 import com.google.inject.Guice;
 import com.google.inject.Injector;
 import javax.inject.Inject;
+import model.Car;
+import model.Engine;
+import model.EngineV6;
+import model.EngineV8;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
@@ -11,31 +15,6 @@
  */
 public class ComponentConstructionTest {
 
-  interface Car {
-
-    Engine engine();
-  }
-
-  interface Engine {
-
-    String name();
-  }
-
-  static class V8Engine implements Engine {
-
-    @Override
-    public String name() {
-      return "V8";
-    }
-  }
-
-  static class V6Engine implements Engine {
-
-    @Override
-    public String name() {
-      return "V6";
-    }
-  }
 
   static final class CarInjectedByConstructor implements Car {
 
@@ -46,7 +25,7 @@ static final class CarInjectedByConstructor implements Car {
       this.engine = engine;
     }
 
-    public Engine engine() {
+    public Engine getEngine() {
       return engine;
     }
   }
@@ -57,7 +36,7 @@ static class CarInjectedByField implements Car {
     private Engine engine;
 
     @Override
-    public Engine engine() {
+    public Engine getEngine() {
       return engine;
     }
   }
@@ -67,28 +46,26 @@ public void inject_by_constructor() {
     Injector injector = Guice.createInjector(new AbstractModule() {
       @Override
       protected void configure() {
-        bind(Engine.class).to(V8Engine.class);
+        bind(Engine.class).to(EngineV8.class);
         bind(Car.class).to(CarInjectedByConstructor.class);
       }
     });
 
     Car car = injector.getInstance(Car.class);
-    Assertions.assertEquals(new V8Engine().name(), car.engine().name());
+    Assertions.assertEquals(new EngineV8().name(), car.getEngine().name());
   }
 
   @Test
   public void inject_by_field() {
     Injector injector = Guice.createInjector(new AbstractModule() {
       @Override
       protected void configure() {
-        bind(Engine.class).to(V6Engine.class);
+        bind(Engine.class).to(EngineV6.class);
         bind(Car.class).to(CarInjectedByField.class);
       }
     });
 
     Car car = injector.getInstance(Car.class);
-    Assertions.assertEquals(new V6Engine().name(), car.engine().name());
+    Assertions.assertEquals(new EngineV6().name(), car.getEngine().name());
   }
-
-
 }

di-function-sample/src/test/java/NamedInjectTest.java

@@ -1,11 +1,21 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import com.google.inject.AbstractModule;
 import com.google.inject.Guice;
 import com.google.inject.Injector;
 import java.lang.annotation.Annotation;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
 import javax.inject.Inject;
 import javax.inject.Named;
+import javax.inject.Qualifier;
+import model.Car;
+import model.Engine;
+import model.EngineV6;
+import model.EngineV8;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
@@ -15,16 +25,6 @@
  */
 public class NamedInjectTest {
 
-  interface Engine {
-
-    String name();
-  }
-
-  interface Car {
-
-    Engine getEngine();
-  }
-
   static class CarWithNamedInject implements Car {
 
     @Inject
@@ -45,22 +45,6 @@ public Class<? extends Annotation> annotationType() {
     }
   }
 
-  static class EngineV8 implements Engine {
-
-    @Override
-    public String name() {
-      return "V8";
-    }
-  }
-
-  static class EngineV6 implements Engine {
-
-    @Override
-    public String name() {
-      return "V6";
-    }
-  }
-
   @Test
   public void should_injected_by_named() {
     Injector injector = Guice.createInjector(new AbstractModule() {
@@ -85,4 +69,45 @@ protected void configure() {
     }));
   }
 
+  @Qualifier
+  @Target({ElementType.CONSTRUCTOR, ElementType.FIELD, ElementType.METHOD})
+  @Retention(RetentionPolicy.RUNTIME)
+  public @interface Super {
+
+  }
+
+  record SuperEngine() implements Super {
+
+    @Override
+    public Class<? extends Annotation> annotationType() {
+      return Super.class;
+    }
+  }
+
+  static class SuperEngineCar implements Car {
+
+    @Inject
+    @Super
+    Engine engine;
+
+    @Override
+    public Engine getEngine() {
+      return engine;
+    }
+  }
+
+  @Test
+  public void should_inject_by_special_annotation() {
+    Injector injector = Guice.createInjector(new AbstractModule() {
+      @Override
+      protected void configure() {
+        bind(Engine.class).annotatedWith(new SuperEngine()).to(EngineV8.class);
+        bind(Car.class).to(SuperEngineCar.class);
+      }
+    });
+
+    Car car = injector.getInstance(Car.class);
+    assertEquals(new EngineV8().name(), car.getEngine().name());
+  }
+
 }

di-function-sample/src/test/java/ScopeTest.java

@@ -0,0 +1,48 @@
+import static org.junit.jupiter.api.Assertions.assertNotSame;
+import static org.junit.jupiter.api.Assertions.assertSame;
+
+import com.google.inject.AbstractModule;
+import com.google.inject.Guice;
+import com.google.inject.Injector;
+import com.google.inject.internal.SingletonScope;
+import javax.inject.Inject;
+import model.Car;
+import model.Engine;
+import model.EngineV8;
+import org.junit.jupiter.api.Test;
+
+/**
+ * @author wynn5a
+ * @date 2022/4/22
+ */
+public class ScopeTest {
+
+  static class MotorCar implements Car {
+
+    @Inject
+    private Engine engine;
+
+    @Override
+    public Engine getEngine() {
+      return engine;
+    }
+  }
+
+
+  @Test
+  public void should_inject_with_scope() {
+    Injector injector = Guice.createInjector(new AbstractModule() {
+      @Override
+      protected void configure() {
+        bind(Engine.class).to(EngineV8.class).in(new SingletonScope());
+        bind(Car.class).to(MotorCar.class);
+      }
+    });
+
+    Car car = injector.getInstance(Car.class);
+    Car car2 = injector.getInstance(Car.class);
+    assertNotSame(car, car2);
+    assertSame(car.getEngine(), car2.getEngine());
+  }
+
+}

di-function-sample/src/test/java/model/Car.java

@@ -0,0 +1,11 @@
+package model;
+
+
+/**
+ * @author wynn5a
+ * @date 2022/4/22
+ */
+public interface Car {
+
+  Engine getEngine();
+}

di-function-sample/src/test/java/model/Engine.java

@@ -0,0 +1,10 @@
+package model;
+
+/**
+ * @author wynn5a
+ * @date 2022/4/22
+ */
+public interface Engine {
+    String name();
+
+}

di-function-sample/src/test/java/model/EngineV6.java

@@ -0,0 +1,13 @@
+package model;
+
+/**
+ * @author wynn5a
+ * @date 2022/4/22
+ */
+public class EngineV6 implements Engine {
+
+  @Override
+  public String name() {
+    return "V6";
+  }
+}

di-function-sample/src/test/java/model/EngineV8.java

@@ -0,0 +1,15 @@
+package model;
+
+/**
+ * @author wynn5a
+ * @date 2022/4/22
+ */
+public class EngineV8 implements Engine {
+
+
+  @Override
+  public String name() {
+    return "V8";
+  }
+
+}