up

pom.xml

@@ -57,13 +57,21 @@
  <buildArg> --enable-native-access=ALL-UNNAMED </buildArg>
  <buildArg>-H:+ForeignAPISupport</buildArg>
  <buildArg>-H:+UnlockExperimentalVMOptions</buildArg>
+ <buildArg>--enable-preview</buildArg>
  </buildArgs>
  </configuration>
 
  </plugin>
  <plugin>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-maven-plugin</artifactId>
+ <configuration>
+ <jvmArguments>
+ <compilerArgs>
+ <arg>--enable-preview</arg>
+ </compilerArgs>
+ </jvmArguments>
+ </configuration>
  </plugin>
  </plugins>
  </build>

src/main/java/com/example/demo/DemoApplication.java

@@ -10,16 +10,22 @@
 import java.lang.foreign.FunctionDescriptor;
 import java.lang.foreign.Linker;
 import java.lang.foreign.SymbolLookup;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Set;
+import java.util.function.BiFunction;
+import java.util.function.Supplier;
+import java.util.stream.Gatherer;
+import java.util.stream.Stream;
 
 import static java.lang.foreign.ValueLayout.ADDRESS;
 import static java.lang.foreign.ValueLayout.JAVA_INT;
 
 @SpringBootApplication
 public class DemoApplication {
 
- public static void main(String[] args) throws Throwable {
+ public static void main(String[] args) {
  SpringApplication.run(DemoApplication.class, args);
  }
 
@@ -49,46 +55,89 @@ interface LanguageDemonstrationRunner {
  void run() throws Throwable;
 }
 
+@Component
+class Gatherers implements LanguageDemonstrationRunner {
+
+ // viktor klang! the legend of klang continues!
+ //https://docs.oracle.com/en/java/javase/22/docs/api/java.base/java/util/stream/Gatherer.html
+ private static <T, R> Gatherer<T, ?, R> scan(
+ Supplier<R> initial,
+ BiFunction<? super R, ? super T, ? extends R> scanner) {
+
+ class State {
+ R current = initial.get();
+ }
+
+ return Gatherer.<T, State, R>ofSequential(
+ State::new,
+ Gatherer.Integrator.ofGreedy((state, element, downstream) -> {
+ state.current = scanner.apply(state.current, element);
+ return downstream.push(state.current);
+ })
+ );
+ }
+
+ @Override
+ public void run() {
+
+ var listOfNumberStrings = Stream
+ .of(1, 2, 3, 4, 5, 6, 7, 8, 9)
+ .gather(scan(() -> "", (string, number) -> string + number)
+ .andThen(java.util.stream.Gatherers.mapConcurrent(10,
+ s -> s.toUpperCase(Locale.ROOT)))
+ )
+ .toList();
+
+ System.out.println( listOfNumberStrings);
+
+ }
+}
+
+@Component
+class StringTemplates implements LanguageDemonstrationRunner {
+
+ @Override
+ public void run() throws Throwable {
+ var name = "josh";
+ System.out.println(STR."name: \{name.toUpperCase()}");
+ }
+}
+
 @Component
 class JExtractFfi implements LanguageDemonstrationRunner {
 
  @Override
  public void run() throws Throwable {
 
+
  }
 
 }
 
 @Component
 class ManualFfi implements LanguageDemonstrationRunner {
 
- public static final FunctionDescriptor PRINTF_FUNCTION_DESCRIPTOR =
+ static final FunctionDescriptor PRINTF_FUNCTION_DESCRIPTOR =
  FunctionDescriptor.of(JAVA_INT, ADDRESS);
 
-
  private final SymbolLookup symbolLookup;
 
  ManualFfi(SymbolLookup symbolLookup) {
  this.symbolLookup = symbolLookup;
  }
 
- private void manualFfi(String greetings) throws Throwable {
+ @Override
+ public void run() throws Throwable {
  var symbolName = "printf";
  var nativeLinker = Linker.nativeLinker();
-
  var methodHandle = this.symbolLookup
  .find(symbolName)
  .map(symbolSegment -> nativeLinker
  .downcallHandle(symbolSegment, PRINTF_FUNCTION_DESCRIPTOR))
  .orElse(null);
  try (var arena = Arena.ofConfined()) {
- var cString = arena.allocateFrom(greetings);
+ var cString = arena.allocateFrom("hello, manual FFI!");
  Objects.requireNonNull(methodHandle).invoke(cString);
  }
  }
-
- @Override
- public void run() throws Throwable {
- manualFfi("hello, manual FFI!");
- }
 }