Merge branch 'BAEL-633' of https://github.com/tomekl007/tutorials into tomekl007-BAEL-633

cglib/pom.xml

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>cglib</artifactId>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+        <!-- https://mvnrepository.com/artifact/cglib/cglib -->
+        <dependency>
+            <groupId>cglib</groupId>
+            <artifactId>cglib</artifactId>
+            <version>${cglib.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <cglib.version>3.2.4</cglib.version>
+        <junit.version>4.12</junit.version>
+    </properties>
+
+
+</project>

cglib/src/main/java/com/baeldung/cglib/mixin/Class1.java

@@ -0,0 +1,8 @@
+package com.baeldung.cglib.mixin;
+
+public class Class1 implements Interface1 {
+    @Override
+    public String first() {
+        return "first behaviour";
+    }
+}

cglib/src/main/java/com/baeldung/cglib/mixin/Class2.java

@@ -0,0 +1,8 @@
+package com.baeldung.cglib.mixin;
+
+public class Class2 implements Interface2 {
+    @Override
+    public String second() {
+        return "second behaviour";
+    }
+}

cglib/src/main/java/com/baeldung/cglib/mixin/Interface1.java

@@ -0,0 +1,5 @@
+package com.baeldung.cglib.mixin;
+
+public interface Interface1 {
+    String first();
+}

cglib/src/main/java/com/baeldung/cglib/mixin/Interface2.java

@@ -0,0 +1,5 @@
+package com.baeldung.cglib.mixin;
+
+public interface Interface2 {
+    String second();
+}

cglib/src/main/java/com/baeldung/cglib/mixin/MixinInterface.java

@@ -0,0 +1,4 @@
+package com.baeldung.cglib.mixin;
+
+public interface MixinInterface extends Interface1, Interface2 {
+}

cglib/src/main/java/com/baeldung/cglib/proxy/PersonService.java

@@ -0,0 +1,11 @@
+package com.baeldung.cglib.proxy;
+
+public class PersonService {
+    public String sayHello(String name) {
+        return "Hello " + name;
+    }
+
+    public Integer lengthOfName(String name) {
+        return name.length();
+    }
+}

cglib/src/test/java/com/baeldung/cglib/proxy/BeanGeneratorTest.java

@@ -0,0 +1,32 @@
+package com.baeldung.cglib.proxy;
+
+
+import net.sf.cglib.beans.BeanGenerator;
+import org.junit.Test;
+
+import java.lang.reflect.Method;
+
+import static junit.framework.TestCase.assertEquals;
+
+public class BeanGeneratorTest {
+
+    @Test
+    public void givenBeanCreator_whenAddPropery_classShouldHaveFieldValue() throws Exception {
+        //given
+        BeanGenerator beanGenerator = new BeanGenerator();
+
+        //when
+        beanGenerator.addProperty("name", String.class);
+        Object myBean = beanGenerator.create();
+        Method setter = myBean
+                .getClass()
+                .getMethod("setName", String.class);
+        setter.invoke(myBean, "some string value set by a cglib");
+
+        //then
+        Method getter = myBean
+                .getClass()
+                .getMethod("getName");
+        assertEquals("some string value set by a cglib", getter.invoke(myBean));
+    }
+}

cglib/src/test/java/com/baeldung/cglib/proxy/MixinTest.java

@@ -0,0 +1,24 @@
+package com.baeldung.cglib.proxy;
+
+import com.baeldung.cglib.mixin.*;
+import net.sf.cglib.proxy.Mixin;
+import org.junit.Test;
+
+import static junit.framework.TestCase.assertEquals;
+
+public class MixinTest {
+
+    @Test
+    public void givenTwoClasses_whenMixtThemIntoOne_mixinShouldHaveMethodsFromBothClasses() throws Exception {
+        //when
+        Mixin mixin = Mixin.create(
+                new Class[]{Interface1.class, Interface2.class, MixinInterface.class},
+                new Object[]{new Class1(), new Class2()}
+        );
+        MixinInterface mixinDelegate = (MixinInterface) mixin;
+
+        //then
+        assertEquals("first behaviour", mixinDelegate.first());
+        assertEquals("second behaviour", mixinDelegate.second());
+    }
+}

cglib/src/test/java/com/baeldung/cglib/proxy/PersonServiceProxyTest.java

@@ -0,0 +1,60 @@
+package com.baeldung.cglib.proxy;
+
+import net.sf.cglib.proxy.Enhancer;
+import net.sf.cglib.proxy.FixedValue;
+import net.sf.cglib.proxy.MethodInterceptor;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class PersonServiceProxyTest {
+    @Test
+    public void givenPersonService_whenSayHello_shouldReturnResult() {
+        //given
+        PersonService personService = new PersonService();
+
+        //when
+        String res = personService.sayHello("Tom");
+
+        //then
+        assertEquals(res, "Hello Tom");
+    }
+
+    @Test
+    public void givenEnhancerProxy_whenExtendPersonService_shouldInterceptMethod() throws Exception {
+        //given
+        Enhancer enhancer = new Enhancer();
+        enhancer.setSuperclass(PersonService.class);
+        enhancer.setCallback((FixedValue) () -> "Hello Tom!");
+        PersonService proxy = (PersonService) enhancer.create();
+
+        //when
+        String res = proxy.sayHello(null);
+
+        //then
+        assertEquals("Hello Tom!", res);
+    }
+
+    @Test
+    public void givenEnhancer_whenExecuteMethodOnProxy_shouldInterceptOnlyStringReturnTypeMethod() throws Exception {
+        //given
+        Enhancer enhancer = new Enhancer();
+        enhancer.setSuperclass(PersonService.class);
+        enhancer.setCallback((MethodInterceptor) (obj, method, args, proxy) -> {
+            if (method.getDeclaringClass() != Object.class && method.getReturnType() == String.class) {
+                return "Hello Tom!";
+            } else {
+                return proxy.invokeSuper(obj, args);
+            }
+        });
+
+        //when
+        PersonService proxy = (PersonService) enhancer.create();
+
+        //then
+        assertEquals("Hello Tom!", proxy.sayHello(null));
+        int lengthOfName = proxy.lengthOfName("Mary");
+        assertEquals(4, lengthOfName);
+    }
+
+}

pom.xml

@@ -28,6 +28,7 @@
         <module>autovalue</module>
 
         <module>cdi</module>
+        <module>cglib</module>
         <!-- <module>core-java-9</module> -->
         <module>core-java</module>
         <module>couchbase-sdk</module>