From 31ef1c4e979bd769a954e0630481a609a5567180 Mon Sep 17 00:00:00 2001
From: Ando <iamando@tuta.io>
Date: Tue, 15 Aug 2023 14:31:10 +0300
Subject: [PATCH] feature: use method chaining on server need to initialize
 server new befor calling listen

---
 examples/hello_lib.rs |  3 ++-
 src/lib.rs            | 16 +++++++++++++---
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/examples/hello_lib.rs b/examples/hello_lib.rs
index 89d5ac1..991da3c 100644
--- a/examples/hello_lib.rs
+++ b/examples/hello_lib.rs
@@ -3,6 +3,7 @@ use core::server::Server;
 fn main() {
   let host = "127.0.0.1";
   let port = 4000;
+  let server = Server::new();
 
-  Server::listen(host, port);
+  server.listen(host, port);
 }
diff --git a/src/lib.rs b/src/lib.rs
index f92e7fe..2e24b32 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -10,14 +10,24 @@ pub mod server {
 
   use crate::handler::Handler;
   use crate::params::Params;
-  pub struct Server {}
+  pub struct Server {
+    initialized: bool,
+  }
 
   impl Server {
     pub fn new() -> Self {
-      Server {}
+      Server { initialized: true }
     }
 
-    pub fn listen(host: &str, port: u32) {
+    fn initialize(&self) {
+      if !self.initialized {
+        panic!("App instance must be initialized using App::new() before calling listen_method()");
+      }
+    }
+
+    pub fn listen(&self, host: &str, port: u32) {
+      self.initialize();
+
       let mut addr = String::new();
 
       if Params::is_empty(host, port) {