BAEL-1715- Control Bean Creation Order with @DependsOn annotation (#4028)

* removing Bean injection * BAEL-1715- Control Bean Creation Order with @DependsOn annotation * BAEL-1715- Formatting changes, test case improvement * Created new Config file for UnitTest * Corrected test case- from BeanCreationException to NoSuchBeanDefinitionException * correcting error- for circular dependency expected exception is- BeanCreationException
2018-06-11 04:36:27 +05:30
parent 0313684ef6
commit 40d3b96820
8 changed files with 214 additions and 0 deletions
@@ -0,0 +1,59 @@
+package com.baeldung.dependson.config;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.DependsOn;
+import org.springframework.context.annotation.Lazy;
+
+import com.baeldung.dependson.file.processor.FileProcessor;
+import com.baeldung.dependson.file.reader.FileReader;
+import com.baeldung.dependson.file.writer.FileWriter;
+import com.baeldung.dependson.shared.File;
+
+@Configuration
+@ComponentScan("com.baeldung.dependson")
+public class TestConfig {
+    
+    @Autowired
+    File file;
+    
+    @Bean("fileProcessor")
+    @DependsOn({"fileReader","fileWriter"})
+    @Lazy
+    public FileProcessor fileProcessor(){
+        return new FileProcessor(file);
+    }
+    
+    @Bean("fileReader")
+    public FileReader fileReader(){
+        return new FileReader(file);
+    }
+    
+    @Bean("fileWriter")
+    public FileWriter fileWriter(){
+        return new FileWriter(file);
+    }
+    
+    @Bean("dummyFileProcessor")
+    @DependsOn({"dummyfileWriter"})
+    @Lazy
+    public FileProcessor dummyFileProcessor(){
+        return new FileProcessor(file);
+    }
+    
+    @Bean("dummyFileProcessorCircular")
+    @DependsOn({"dummyFileReaderCircular"})
+    @Lazy
+    public FileProcessor dummyFileProcessorCircular(){
+        return new FileProcessor(file);
+    }
+    
+    @Bean("dummyFileReaderCircular")
+    @DependsOn({"dummyFileProcessorCircular"})
+    @Lazy
+    public FileReader dummyFileReaderCircular(){
+        return new FileReader(file);
+    }
+}
@@ -0,0 +1,42 @@
+package com.baeldung.dependson.processor;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.BeanCreationException;
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationContext;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import com.baeldung.dependson.config.TestConfig;
+import com.baeldung.dependson.shared.File;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = TestConfig.class)
+public class FileProcessorTest {
+
+    @Autowired
+    ApplicationContext context;
+    
+    @Autowired
+    File file;
+    
+    @Test
+    public void whenAllBeansCreated_FileTextEndsWithProcessed() {
+        context.getBean("fileProcessor");
+        assertTrue(file.getText().endsWith("processed"));
+    }
+
+    @Test(expected=NoSuchBeanDefinitionException.class)
+    public void whenDependentBeanNotAvailable_ThrowsNoSuchBeanDefinitionException(){
+        context.getBean("dummyFileProcessor");
+    }
+    
+    @Test(expected=BeanCreationException.class)
+    public void whenCircularDependency_ThrowsBeanCreationException(){
+        context.getBean("dummyFileReaderCircular");
+    }
+}