////
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this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
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http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
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See the License for the specific language governing permissions and
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////
= Arthur Implementation

Arthur implementation provides `org.apache.geronimo.arthur.impl.nativeimage.ArthurNativeImageExecutor` which executes the extensions and run `native-image`.

== Dependencies

[source,xml]
----
<dependency>
  <groupId>org.apache.geronimo.arthur</groupId>
  <artifactId>arthur-impl</artifactId>
  <version>${arthur.version}</version>
</dependency>
----

== Usage

By itself implementation module will miss a class finder and a JSON serializer.
You will likely want to add these dependencies to be able to use it in standalone mode - maven plugin does it for you:

[source,xml]
----
<dependency>
  <groupId>org.apache.xbean</groupId>
  <artifactId>xbean-finder-shaded</artifactId>
</dependency>
<dependency>
  <groupId>org.apache.geronimo.specs</groupId>
  <artifactId>geronimo-json_1.1_spec</artifactId>
</dependency>
<dependency>
  <groupId>org.apache.geronimo.specs</groupId>
  <artifactId>geronimo-jsonb_1.0_spec</artifactId>
</dependency>
<dependency>
  <groupId>org.apache.johnzon</groupId>
  <artifactId>johnzon-jsonb</artifactId>
</dependency>
----

Once you have that you can create a `Jsonb` instance to serialize the model and an `AnnotationFinder` to let `Context#finder` be implemented:

[source,java]
----
try (final Jsonb jsonb = JsonbBuilder.create(new JsonbConfig()
             .setProperty("johnzon.cdi.activated", false)
             .withPropertyOrderStrategy(PropertyOrderStrategy.LEXICOGRAPHICAL))) {
    final AnnotationFinder finder = new AnnotationFinder(createScannedArchive());
    // finder.link() if you want to use findImplementations()
    new ArthurNativeImageExecutor(
        ArthurNativeImageExecutor.ExecutorConfiguration.builder()
                .jsonSerializer(jsonb::toJson)
                .annotatedClassFinder(finder::findAnnotatedClasses)
                .annotatedMethodFinder(finder::findAnnotatedMethods)
                .implementationFinder(p -> Collection.class.cast(finder.findImplementations(p)))
                .configuration(configuration)
                .workingDirectory(workdir.toPath().resolve("generated_configuration"))
                .build())
        .run();
} catch (final Exception e) {
    throw new IllegalStateException(e);
} finally {
    thread.setContextClassLoader(oldLoader);
}
----

== GraalVM Installer

The implementation module also contains the building block to install GraalVM locally.
It is based on `org.apache.geronimo.arthur.impl.nativeimage.installer.SdkmanGraalVMInstaller`.
The high level mecanism is to download it from an URL and cache it locally (archive + exploded folder).
For that it needs an "extractor" implementation which supports `tar.gz` on linux and `zip` on windows/cygwin.
You can use the provided `Extractor` class but then you need to add `commons-compress`:

[source,xml]
----
<dependency>
  <groupId>org.apache.commons</groupId>
  <artifactId>commons-compress</artifactId>
  <version>1.19</version>
</dependency>
----

Once done the usage is pretty straigh forward:

[source,java]
----
final Path cache = Paths.get("cached-graal.tar.gz");
final Path workdir = Paths.get(System.getProperty("java.io.tmpdir")).resolve("graal_work_dir");
final SdkmanGraalVMInstallerConfiguration config = SdkmanGraalVMInstallerConfiguration.builder()
    .offline(offline)
    .inheritIO(inheritIO)
    .url("https://api.sdkman.io/2/broker/download/java/19.2.1-grl/linux64")
    .version("19.2.1")
    .platform("linux64")
    .gav("com.oracle.graal:graalvm:tar.gz:19.2.1")
    .workdir(workdir)
    // use built-in commons-compress based extractor, alternative you can do an exec of tar command if preferred
    .extractor(new Extractor()::unpack)
    // hardcoded cache
    .resolver(gav -> cache)
    .installer((gav, file) -> Files.copy(file, cache))
    .build();
final SdkmanGraalVMInstaller graalInstaller = new SdkmanGraalVMInstaller(config);
final Path graalHome = graalInstaller.install();
configuration.setNativeImage(graalInstaller.installNativeImage().toAbsolutePath().toString());
----


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