jni

rs-wrapper/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "rs-wrapper"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+jni = "0.20.0"
+minmax = { path = "../minmax-rs" }

rs-wrapper/ch_bbw_m411_connect4_RustPlayer.h

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+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include <jni.h>
+/* Header for class ch_bbw_m411_connect4_RustPlayer */
+
+#ifndef _Included_ch_bbw_m411_connect4_RustPlayer
+#define _Included_ch_bbw_m411_connect4_RustPlayer
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class:     ch_bbw_m411_connect4_RustPlayer
+ * Method:    rustPlay
+ * Signature: (B[Lch/bbw/m411/connect4/Connect4ArenaMain/Stone;)I
+ */
+JNIEXPORT jint JNICALL Java_ch_bbw_m411_connect4_RustPlayer_rustPlay
+  (JNIEnv *, jobject, jbyte, jobjectArray);
+
+#ifdef __cplusplus
+}
+#endif
+#endif

rs-wrapper/src/lib.rs

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+// This is the interface to the JVM that we'll call the majority of our
+// methods on.
+use jni::JNIEnv;
+
+// These objects are what you should use as arguments to your native
+// function. They carry extra lifetime information to prevent them escaping
+// this context and getting used after being GC'd.
+use jni::objects::{JClass, JObject};
+
+// This is just a pointer. We'll be returning it from our function. We
+// can't return one of the objects with lifetime information because the
+// lifetime checker won't let us.
+use jni::sys::{jbyte, jint};
+use minmax::{connect4::board::Connect4, GamePlayer};
+
+// 0 -> X
+// 1 -> O
+pub fn wrap_player<P: GamePlayer<Connect4>>(current_player: i8, board: ()) -> i32 {
+    0
+}
+
+// This keeps Rust from "mangling" the name and making it unique for this
+// crate.
+#[no_mangle]
+pub extern "system" fn Java_ch_bbw_m411_connect4_RustPlayer_rustPlay(
+    env: JNIEnv<'_>,
+    // This is the class that owns our static method. It's not going to be used,
+    // but still must be present to match the expected signature of a static
+    // native method.
+    class: JClass<'_>,
+    player: jbyte,
+    board: JObject<'_>,
+) -> jint {
+    0
+}