Create AOP examples

- Use different types of advice
- Use various types of pointcut expressions

spring-mvc-java/src/test/java/org/baeldung/aop/AopLoggingTest.java

@@ -0,0 +1,67 @@
+package org.baeldung.aop;
+
+import org.baeldung.config.TestConfig;
+import org.baeldung.dao.FooDao;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.support.AnnotationConfigContextLoader;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.logging.Handler;
+import java.util.logging.LogRecord;
+import java.util.logging.Logger;
+import java.util.regex.Pattern;
+
+import static org.hamcrest.Matchers.hasSize;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = {TestConfig.class}, loader = AnnotationConfigContextLoader.class)
+public class AopLoggingTest {
+
+    @Before
+    public void setUp() {
+        logEventHandler = new Handler() {
+            @Override
+            public void publish(LogRecord record) {
+                messages.add(record.getMessage());
+            }
+
+            @Override
+            public void flush() {
+            }
+
+            @Override
+            public void close() throws SecurityException {
+            }
+        };
+
+        messages = new ArrayList<>();
+    }
+
+    @Autowired
+    private FooDao dao;
+
+    private Handler logEventHandler;
+
+    private List<String> messages;
+
+    @Test
+    public void givenLoggingAspect_whenCallDaoMethod_thenBeforeAdviceIsCalled() {
+        Logger logger = Logger.getLogger(LoggingAspect.class.getName());
+        logger.addHandler(logEventHandler);
+
+        dao.findById(1L);
+        assertThat(messages, hasSize(1));
+
+        String logMessage = messages.get(0);
+        Pattern pattern = Pattern.compile("^\\[\\d{4}\\-\\d{2}\\-\\d{2} \\d{2}:\\d{2}:\\d{2}:\\d{3}\\]findById$");
+        assertTrue(pattern.matcher(logMessage).matches());
+    }
+}

spring-mvc-java/src/test/java/org/baeldung/aop/AopPublishingTest.java

@@ -0,0 +1,67 @@
+package org.baeldung.aop;
+
+import org.baeldung.config.TestConfig;
+import org.baeldung.dao.FooDao;
+import org.baeldung.events.FooCreationEventListener;
+import org.baeldung.model.Foo;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.support.AnnotationConfigContextLoader;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.logging.Handler;
+import java.util.logging.LogRecord;
+import java.util.logging.Logger;
+import java.util.regex.Pattern;
+
+import static org.junit.Assert.assertTrue;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = {TestConfig.class}, loader = AnnotationConfigContextLoader.class)
+public class AopPublishingTest {
+
+    @Before
+    public void setUp() {
+        logEventHandler = new Handler() {
+            @Override
+            public void publish(LogRecord record) {
+                messages.add(record.getMessage());
+            }
+
+            @Override
+            public void flush() {
+            }
+
+            @Override
+            public void close() throws SecurityException {
+            }
+        };
+
+        messages = new ArrayList<>();
+    }
+
+    @Autowired
+    private FooDao dao;
+
+    private Handler logEventHandler;
+
+    private List<String> messages;
+
+    @Test
+    public void givenPublishingAspect_whenCallCreate_thenCreationEventIsPublished() {
+        Logger logger = Logger.getLogger(FooCreationEventListener.class.getName());
+        logger.addHandler(logEventHandler);
+
+        dao.create(1L, "Bar");
+
+        String logMessage = messages.get(0);
+        Pattern pattern = Pattern.compile("Created foo instance: " +
+                Pattern.quote(new Foo(1L, "Bar").toString()));
+        assertTrue(pattern.matcher(logMessage).matches());
+    }
+}

spring-mvc-java/src/test/java/org/baeldung/aop/AopXmlConfigPerformanceTest.java

@@ -0,0 +1,67 @@
+package org.baeldung.aop;
+
+import org.baeldung.dao.FooDao;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.logging.Handler;
+import java.util.logging.LogRecord;
+import java.util.logging.Logger;
+import java.util.regex.Pattern;
+
+import static org.hamcrest.CoreMatchers.notNullValue;
+import static org.hamcrest.Matchers.hasSize;
+import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration("/org/baeldung/aop/beans.xml")
+public class AopXmlConfigPerformanceTest {
+
+    @Before
+    public void setUp() {
+        logEventHandler = new Handler() {
+            @Override
+            public void publish(LogRecord record) {
+                messages.add(record.getMessage());
+            }
+
+            @Override
+            public void flush() {
+            }
+
+            @Override
+            public void close() throws SecurityException {
+            }
+        };
+
+        messages = new ArrayList<>();
+    }
+
+    @Autowired
+    private FooDao dao;
+
+    private Handler logEventHandler;
+
+    private List<String> messages;
+
+    @Test
+    public void givenPerformanceAspect_whenCallDaoMethod_thenPerformanceMeasurementAdviceIsCalled() {
+        Logger logger = Logger.getLogger(PerformanceAspect.class.getName());
+        logger.addHandler(logEventHandler);
+
+        final String entity = dao.findById(1L);
+        assertThat(entity, notNullValue());
+        assertThat(messages, hasSize(1));
+
+        String logMessage = messages.get(0);
+        Pattern pattern = Pattern.compile("Execution of findById took \\d+ ms");
+        assertTrue(pattern.matcher(logMessage).matches());
+    }
+}

spring-mvc-java/src/test/java/org/baeldung/config/TestConfig.java

@@ -5,7 +5,7 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.EnableAspectJAutoProxy;
 
 @Configuration
-@ComponentScan(basePackages = {"org.baeldung.dao", "org.baeldung.aop"})
+@ComponentScan(basePackages = {"org.baeldung.dao", "org.baeldung.aop", "org.baeldung.events"})
 @EnableAspectJAutoProxy
 public class TestConfig {
 }