From b083ef958d6557b18d22ed4cc02aaeacaf817df5 Mon Sep 17 00:00:00 2001
From: nils <48135649+Nilstrieb@users.noreply.github.com>
Date: Mon, 9 Jan 2023 11:01:06 +0100
Subject: [PATCH] works

---
 .gitignore                                    |  3 ++-
 README.md                                     | 23 +++++++++++++++++++
 minmax-java/build.gradle                      |  8 ++++++-
 .../java/ch/bbw/m411/connect4/RustPlayer.java |  7 ++++++
 4 files changed, 39 insertions(+), 2 deletions(-)
 create mode 100644 README.md

diff --git a/.gitignore b/.gitignore
index a211351..3c354a1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 minmax-java/build
 minmax-java/.gradle
 .idea
-target
\ No newline at end of file
+target
+*.so
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..9c66873
--- /dev/null
+++ b/README.md
@@ -0,0 +1,23 @@
+# Minmax in Rust with JNI
+
+## How to build and run
+
+### Prerequisites
+- Gradle
+- Rust toolchain
+
+### Compile Rust code
+
+`cargo build`
+
+### Assemble shared library
+
+Copy the shared library in `target/debug/librs_wrapper.so` (or a `.dll` on windows) to a known location like the working directory or the system wide library directory.
+
+### Build the jar
+
+Use `./gradlew jar` or whatever you like I don't know.
+
+### Run the program
+
+Maybe it works now. If you get a link error you might need to set the `LD_LIBRARY_PATH` env var to the path of the shared library (on linux). Or you have to copy it to the systems library directory. Or something else. But it should work.
\ No newline at end of file
diff --git a/minmax-java/build.gradle b/minmax-java/build.gradle
index c062119..5700a19 100644
--- a/minmax-java/build.gradle
+++ b/minmax-java/build.gradle
@@ -11,6 +11,12 @@ java {
 	}
 }
 
+jar {
+    manifest {
+        attributes 'Main-Class': 'ch.bbw.m411.connect4.Connect4ArenaMain'
+    }
+}
+
 repositories {
 	mavenCentral()
 }
@@ -23,4 +29,4 @@ dependencies {
 
 tasks.named('test') {
 	useJUnitPlatform()
-}
+}
\ No newline at end of file
diff --git a/minmax-java/src/main/java/ch/bbw/m411/connect4/RustPlayer.java b/minmax-java/src/main/java/ch/bbw/m411/connect4/RustPlayer.java
index 5f09555..eb872b2 100644
--- a/minmax-java/src/main/java/ch/bbw/m411/connect4/RustPlayer.java
+++ b/minmax-java/src/main/java/ch/bbw/m411/connect4/RustPlayer.java
@@ -3,6 +3,13 @@ package ch.bbw.m411.connect4;
 public class RustPlayer extends Connect4ArenaMain.DefaultPlayer {
     private static native int rustPlay(byte player, byte[] board);
 
+    static {
+        // This actually loads the shared object that we'll be creating.
+        // The actual location of the .so or .dll may differ based on your
+        // platform.
+        System.loadLibrary("rs_wrapper");
+    }
+
     @Override
     protected int play() {
         byte player = switch (this.myColor) {