diff --git a/slides/31082023-JugHH-automated-refactorings/images/61478321.png b/slides/31082023-JugHH-automated-refactorings/images/61478321.png new file mode 100644 index 0000000..77af48e Binary files /dev/null and b/slides/31082023-JugHH-automated-refactorings/images/61478321.png differ diff --git a/slides/31082023-JugHH-automated-refactorings/images/Komplexitaet_verteiling.webp b/slides/31082023-JugHH-automated-refactorings/images/Komplexitaet_verteiling.webp new file mode 100644 index 0000000..bddf2fb Binary files /dev/null and b/slides/31082023-JugHH-automated-refactorings/images/Komplexitaet_verteiling.webp differ diff --git a/slides/31082023-JugHH-automated-refactorings/images/_sources.adoc b/slides/31082023-JugHH-automated-refactorings/images/_sources.adoc new file mode 100644 index 0000000..ce9ddee --- /dev/null +++ b/slides/31082023-JugHH-automated-refactorings/images/_sources.adoc @@ -0,0 +1,5 @@ +== Image Credits + +* Project Logos from respective Project Page +* Migration Types from https://docs.moderne.io/administrator-documentation/proof-of-value[Moderne Prove of Value] +* Moderne UI Screenshot by Author diff --git a/slides/31082023-JugHH-automated-refactorings/images/moderne_ui_screenshot.png b/slides/31082023-JugHH-automated-refactorings/images/moderne_ui_screenshot.png new file mode 100644 index 0000000..4a68299 Binary files /dev/null and b/slides/31082023-JugHH-automated-refactorings/images/moderne_ui_screenshot.png differ diff --git a/slides/31082023-JugHH-automated-refactorings/images/powerOfRewrite.png b/slides/31082023-JugHH-automated-refactorings/images/powerOfRewrite.png new file mode 100644 index 0000000..8d1162a Binary files /dev/null and b/slides/31082023-JugHH-automated-refactorings/images/powerOfRewrite.png differ diff --git a/slides/31082023-JugHH-automated-refactorings/images/sping-boot-27-migration-guide.png b/slides/31082023-JugHH-automated-refactorings/images/sping-boot-27-migration-guide.png new file mode 100644 index 0000000..6bf070a Binary files /dev/null and b/slides/31082023-JugHH-automated-refactorings/images/sping-boot-27-migration-guide.png differ diff --git a/slides/31082023-JugHH-automated-refactorings/images/springbootpetclinic.png b/slides/31082023-JugHH-automated-refactorings/images/springbootpetclinic.png new file mode 100644 index 0000000..074be8d Binary files /dev/null and b/slides/31082023-JugHH-automated-refactorings/images/springbootpetclinic.png differ diff --git a/slides/31082023-JugHH-automated-refactorings/index.html b/slides/31082023-JugHH-automated-refactorings/index.html new file mode 100644 index 0000000..bea631e --- /dev/null +++ b/slides/31082023-JugHH-automated-refactorings/index.html @@ -0,0 +1,797 @@ +OpenRewrite: Automated Refactorings

OpenRewrite

Automated Refactorings

+ + +
+
+ +
+

Merlin Bögershausen

+

@mboegie

+
+
+
+ +
+

Java Usergroup Hamburg

+

@jughh

+
+
+
+ +
+

Java Software Engineer

+

Line of Business Public

+
+
+
+
+
+ +
+

Java Usergroup Hamburg / @jughh

+
+
+
+ + +

+ Merlin Bögershausen + / @mboegie +

+
+
+ +
+

Was ist Refactoring?

Refactoring is a controlled technique for improving the design of an existing code base. +Its essence is applying a series of small behavior-preserving transformations, each of which "too small to be worth doing".
— Fowler

Multiline Strings

Klassisch

+
String query =
+  "SELECT * FROM\n" +
+  "my_table\n" +
+  "WHERE something = 1;";
+

Java 15+

+
String query = """
+  SELECT * FROM
+  my_table
+  WHERE something = 1;\
+  """;
+

Framework Migration

Spring Boot 2.7 Migration Guide
+

See Spring Boot 2.7 Release Notes

+

Migration Types

Komplexitaet verteiling
+
+

Automate IT!

Open Rewrite Logo

Let’s dive in!

Screenshot

+

Configure Plugin

mvn -U org.openrewrite.maven:rewrite-maven-plugin:run
+
<plugin>
+  <groupId>org.openrewrite.maven</groupId>
+  <artifactId>rewrite-maven-plugin</artifactId>
+  <version>4.45.0</version>
+</plugin>
+

Activate Recipe

siehe openrewrite.org: Recipe Katalog

+
-Drewrite.activeRecipes=\
+ org.openrewrite.java.RemoveUnusedImports
+
<configuration>
+  <activeRecipes>
+    <recipe>
+      org.openrewrite.java.RemoveUnusedImports
+    </recipe>
+  </activeRecipes>
+</configuration>

Refactor!

./mvnw rewrite:run
+
Changes have been made to .github/workflows/maven-build.yml by:
+ org.openrewrite.java.spring.boot3.UpgradeSpringBoot_3_0
+  org.openrewrite.java.spring.boot3.MavenPomUpgrade
+   org.openrewrite.java.migrate.JavaVersion17
+    org.openrewrite.java.migrate.UpgradeJavaVersion:
+      {version=17}
+  org.openrewrite.java.migrate.UpgradeToJava17
+   org.openrewrite.github.SetupJavaUpgradeJavaVersion

LST

der Lossless Semantic Tree

+
// 0
+class A { // 1
+  void test() {
+    int a;
+    a = 0;
+  }
+}
+
-J.CompilationUnit // 0
+ \-J.ClassDeclaration // 1 - start
+   |-J.Identifier | "A"
+   \-J.Block // 1 - end
+     \-J.MethodDeclaration | "MethodDeclaration{A{name=test,return=void,parameters=[]}}"
+

Recipe

Recipe ein ausführbares Refactoring

+
public class MakePublic extends Recipe {
+  @Override
+  protected JavaVisitor<ExecutionContext> getVisitor() {
+    return new MakePublicVisitor(); // 1
+  }
+  public String getDisplayName() {
+    return "Change class visibility to public 🤡";
+  }
+  private class MakePublicVisitor
+    extends JavaVisitor<ExecutionContext> {}
+}
+

Visitor

Bearbeite den LST mit Visitors

+
class JavaVisitor<P> extends TreeVisitor<J, P> {
+  J visitStatement(Statement statement) {}
+  J visitAnnotatedType(J.AnnotatedType annotatedType)  {}
+  J visitAnnotation(J.Annotation annotation) {}
+  J visitAssert(J.Assert azzert) {}
+  J visitAssignment(J.Assignment assign) {}
+  J visitAssignmentOperation(J.AssignmentOperation assignOp) {}
+  //...
+}
+

Visitor Implementation

new JavaIsoVisitor<ExecutionContext> {
+  public J.ClassDeclaration visitClassDeclaration(
+          J.ClassDeclaration cd, ExecutionContext ctx) { // 1
+    cd = super.visitClassDeclaration(cd, ctx);
+    List<J.Modifier> modifiers = cd.getModifiers(); // 2
+    modifiers.removeIf( //2
+            m -> J.Modifier.Type.Private.equals(m.getType()));
+    // and Protected & Publicπ
+    modifiers.add(PUBLIC_MODIFIER); // 3
+    return cd.withModifiers(modifiers); // 4
+  }
+}
+

Declarative YAML

Be declarative!

+
---
+type: specs.openrewrite.org/v1beta/recipe
+name: io.github.mboegers.rewrite.MakePublic
+displayName: Change method access level to public
+recipeList:
+  - org.openrewrite.java.ChangeMethodAccessLevel:
+      methodPattern: *
+      newAccessLevel: public
+      matchOverrides: null
+

Styles

type: specs.openrewrite.org/v1beta/style
+name: io.moderne.spring.style
+styleConfigs:
+  - org.openrewrite.java.style.NeedBracesStyle:
+      allowSingleLineStatement: false
+      allowEmptyLoopBody: true
+
for(int i = 0; i < 10; i++);
+if(success()) return false;
+
for(int i = 0; i < 10; i++);
+if(success()){
+    return false;
+}
+
+

Takeaways

600

Moderne.io

700
+

Abilities

powerOfRewrite
+
+

.stretch

+

.stretch

+

Slides

Unter Slides: https://mboegers.github.io/slidedeck/slides/31082023-JugHH-automated-refactorings

+

Image Credits

  • Project Logos from respective Project Page

  • Migration Types from Moderne Prove of Value

  • Moderne UI Screenshot by Author

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