Improved typing

src/main/java/dev/selimaj/session/Session.java

@@ -3,6 +3,7 @@ package dev.selimaj.session;
 import com.fasterxml.jackson.databind.JsonNode;
 
 import dev.selimaj.session.types.Message;
+import dev.selimaj.session.types.Method;
 
 import java.net.URI;
 import java.net.http.HttpClient;
@@ -46,11 +47,10 @@ public final class Session {
         listener.notify(ws, method, data);
     }
 
-    public <Req, Res> CompletableFuture<Res> request(
-            String method,
-            Req data,
-            Class<Res> resType) throws Exception {
-        return listener.request(ws, method, data, resType);
+    <Req extends JsonNode, Res extends JsonNode, Err extends JsonNode> CompletableFuture<Res> request(
+            Class<? extends Method<Req, Res, Err>> method, Req req) throws Exception {
+        Method<Req, Res, Err> m = method.getDeclaredConstructor().newInstance();
+        return listener.request(ws, m.getName(), req, m.getResClass());
     }
 
     public void close() throws Exception {

src/main/java/dev/selimaj/session/types/Method.java

@@ -2,6 +2,32 @@ package dev.selimaj.session.types;
 
 import com.fasterxml.jackson.databind.JsonNode;
 
-public interface Method<Req extends JsonNode, Res extends JsonNode, Err extends JsonNode> {
-    String getName();
+public class Method<Req extends JsonNode, Res extends JsonNode, Err extends JsonNode> {
+    private final String name;
+    private final Class<Req> reqClass;
+    private final Class<Res> resClass;
+    private final Class<Err> errClass;
+
+    protected Method(String name, Class<Req> reqClass, Class<Res> resClass, Class<Err> errClass) {
+        this.name = name;
+        this.reqClass = reqClass;
+        this.resClass = resClass;
+        this.errClass = errClass;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Class<Req> getReqClass() {
+        return reqClass;
+    }
+
+    public Class<Res> getResClass() {
+        return resClass;
+    }
+
+    public Class<Err> getErrClass() {
+        return errClass;
+    }
 }

src/test/java/dev/selimaj/session/Methods.java

@@ -5,14 +5,9 @@ import com.fasterxml.jackson.databind.node.TextNode;
 import dev.selimaj.session.types.Method;
 
 public class Methods {
-    public static class Data implements Method<TextNode, TextNode, TextNode> {
-        @Override
-        public String getName() {
-            return "data";
-        }
-
-        public static String getNameStatic() {
-            return "data";
+    public static class Data extends Method<TextNode, TextNode, TextNode> {
+        Data() {
+            super("data", TextNode.class, TextNode.class, TextNode.class);
         }
     }
 }

src/test/java/dev/selimaj/session/SessionTest.java

@@ -2,15 +2,19 @@ package dev.selimaj.session;
 
 import org.junit.jupiter.api.Test;
 
+import com.fasterxml.jackson.databind.node.TextNode;
+
 public class SessionTest {
     static void testRequest() throws Exception {
         Session session = Session.connect("ws://localhost:8080/");
 
-        String response = session.request(Methods.Data.getNameStatic(), "Hello from client", String.class).get();
+        TextNode response = session.request(Methods.Data.class, TextNode.valueOf("Hello from client")).get();
 
         System.out.println(response);
 
         Thread.sleep(1000);
+
+        session.close();
     }
 
     @Test