An Introduction to CDI (Contexts and Dependency Injection) (#4503)

* Initial Commit * Update pom.xml * Update TimeLoggerFactoryUnitTest.java * Update PngFileEditorUnitTest.java
2018-06-19 18:19:56 -03:00
parent 4bfb407cfc
commit 4109abebf9
18 changed files with 459 additions and 1 deletions
@@ -0,0 +1,18 @@
+package com.baeldung.dependencyinjection.application;
+
+import com.baeldung.dependencyinjection.imageprocessors.ImageFileProcessor;
+import org.jboss.weld.environment.se.Weld;
+import org.jboss.weld.environment.se.WeldContainer;
+
+public class FileApplication {
+    
+    public static void main(String[] args) {
+        Weld weld = new Weld();
+        WeldContainer container = weld.initialize();
+        ImageFileProcessor imageFileProcessor = container.select(ImageFileProcessor.class).get();
+        System.out.println(imageFileProcessor.openFile("file1.png"));
+        System.out.println(imageFileProcessor.writeFile("file1.png"));
+        System.out.println(imageFileProcessor.saveFile("file1.png"));
+        container.shutdown();
+    }
+}
@@ -0,0 +1,14 @@
+package com.baeldung.dependencyinjection.factories;
+
+import com.baeldung.dependencyinjection.loggers.TimeLogger;
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+import javax.enterprise.inject.Produces;
+
+public class TimeLoggerFactory {
+    
+    @Produces
+    public TimeLogger getTimeLogger() {
+        return new TimeLogger(new SimpleDateFormat("HH:mm"), Calendar.getInstance());
+    }
+}
@@ -0,0 +1,27 @@
+package com.baeldung.dependencyinjection.imagefileeditors;
+
+import com.baeldung.dependencyinjection.qualifiers.GifFileEditorQualifier;
+
+@GifFileEditorQualifier
+public class GifFileEditor implements ImageFileEditor {
+    
+    @Override
+    public String openFile(String fileName) {
+        return "Opening GIF file " + fileName;
+    }
+
+    @Override
+    public String editFile(String fileName) {
+        return "Editing GIF file " + fileName;
+    }
+    
+    @Override
+    public String writeFile(String fileName) {
+        return "Writing GIF file " + fileName;
+    }
+
+    @Override
+    public String saveFile(String fileName) {
+        return "Saving GIF file " + fileName;
+    }
+}
@@ -0,0 +1,12 @@
+package com.baeldung.dependencyinjection.imagefileeditors;
+
+public interface ImageFileEditor {
+    
+    String openFile(String fileName);
+    
+    String editFile(String fileName);
+    
+    String writeFile(String fileName);
+    
+    String saveFile(String fileName);
+}
@@ -0,0 +1,27 @@
+package com.baeldung.dependencyinjection.imagefileeditors;
+
+import com.baeldung.dependencyinjection.qualifiers.JpgFileEditorQualifier;
+
+@JpgFileEditorQualifier
+public class JpgFileEditor implements ImageFileEditor {
+   
+    @Override
+    public String openFile(String fileName) {
+        return "Opening JPG file " + fileName;
+    }
+
+    @Override
+    public String editFile(String fileName) {
+        return "Editing JPG file " + fileName;
+    }
+    
+    @Override
+    public String writeFile(String fileName) {
+        return "Writing JPG file " + fileName;
+    }
+
+    @Override
+    public String saveFile(String fileName) {
+        return "Saving JPG file " + fileName;
+    }
+}
@@ -0,0 +1,27 @@
+package com.baeldung.dependencyinjection.imagefileeditors;
+
+import com.baeldung.dependencyinjection.qualifiers.PngFileEditorQualifier;
+
+@PngFileEditorQualifier
+public class PngFileEditor implements ImageFileEditor {
+   
+    @Override
+    public String openFile(String fileName) {
+        return "Opening PNG file " + fileName;
+    }
+
+    @Override
+    public String editFile(String fileName) {
+        return "Editing PNG file " + fileName;
+    }
+    
+    @Override
+    public String writeFile(String fileName) {
+        return "Writing PNG file " + fileName;
+    }
+
+    @Override
+    public String saveFile(String fileName) {
+        return "Saving PNG file " + fileName;
+    }
+}
@@ -0,0 +1,42 @@
+package com.baeldung.dependencyinjection.imageprocessors;
+
+import com.baeldung.dependencyinjection.loggers.TimeLogger;
+import com.baeldung.dependencyinjection.qualifiers.PngFileEditorQualifier;
+import javax.inject.Inject;
+import com.baeldung.dependencyinjection.imagefileeditors.ImageFileEditor;
+
+public class ImageFileProcessor {
+    
+    private final ImageFileEditor imageFileEditor;
+    private final TimeLogger timeLogger;
+    
+    @Inject
+    public ImageFileProcessor(@PngFileEditorQualifier ImageFileEditor imageFileEditor, TimeLogger timeLogger) {
+        this.imageFileEditor = imageFileEditor;
+        this.timeLogger = timeLogger;
+    }
+    
+    public ImageFileEditor getImageFileditor() {
+        return imageFileEditor;
+    }
+    
+    public TimeLogger getTimeLogger() {
+        return timeLogger;
+    }
+    
+    public String openFile(String fileName) {
+        return imageFileEditor.openFile(fileName) + " at: " + timeLogger.getTime();
+    }
+    
+    public String editFile(String fileName) {
+        return imageFileEditor.editFile(fileName) + " at: " + timeLogger.getTime();
+    }
+     
+    public String writeFile(String fileName) {
+        return imageFileEditor.writeFile(fileName) + " at: " + timeLogger.getTime();
+    }
+    
+    public String saveFile(String fileName) {
+        return imageFileEditor.saveFile(fileName)+ " at: " + timeLogger.getTime();
+    }
+}
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+package com.baeldung.dependencyinjection.loggers;
+
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+
+public class TimeLogger {
+    
+    private final SimpleDateFormat dateFormat;
+    private final Calendar calendar;
+    
+    public TimeLogger(SimpleDateFormat dateFormat, Calendar calendar) {
+        this.dateFormat = dateFormat;
+        this.calendar = calendar;
+    }
+    
+    public String getTime() {
+        return dateFormat.format(calendar.getTime());
+    }
+}
@@ -0,0 +1,12 @@
+package com.baeldung.dependencyinjection.qualifiers;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+import javax.inject.Qualifier;
+
+@Qualifier
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.FIELD, ElementType.METHOD, ElementType.TYPE, ElementType.PARAMETER})
+public @interface GifFileEditorQualifier {}
@@ -0,0 +1,12 @@
+package com.baeldung.dependencyinjection.qualifiers;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+import javax.inject.Qualifier;
+
+@Qualifier
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.FIELD, ElementType.METHOD, ElementType.TYPE, ElementType.PARAMETER})
+public @interface JpgFileEditorQualifier {}
@@ -0,0 +1,12 @@
+package com.baeldung.dependencyinjection.qualifiers;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+import javax.inject.Qualifier;
+
+@Qualifier
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.FIELD, ElementType.METHOD, ElementType.TYPE, ElementType.PARAMETER})
+public @interface PngFileEditorQualifier {}