diff --git a/Cargo.lock b/Cargo.lock
index 8ac993a..aefd5e4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -205,6 +205,7 @@ version = "0.0.1"
 dependencies = [
  "anyhow",
  "flexi_logger",
+ "futures",
  "log",
  "once_cell",
  "path-clean",
@@ -284,6 +285,7 @@ checksum = "23342abe12aba583913b2e62f22225ff9c950774065e4bfb61a19cd9770fec40"
 dependencies = [
  "futures-channel",
  "futures-core",
+ "futures-executor",
  "futures-io",
  "futures-sink",
  "futures-task",
@@ -306,6 +308,17 @@ version = "0.3.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4bca583b7e26f571124fe5b7561d49cb2868d79116cfa0eefce955557c6fee8c"
 
+[[package]]
+name = "futures-executor"
+version = "0.3.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ccecee823288125bd88b4d7f565c9e58e41858e47ab72e8ea2d64e93624386e0"
+dependencies = [
+ "futures-core",
+ "futures-task",
+ "futures-util",
+]
+
 [[package]]
 name = "futures-io"
 version = "0.3.28"
diff --git a/Cargo.toml b/Cargo.toml
index f02bb9e..6459eb5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,6 +7,7 @@ edition = "2018"
 [dependencies]
 sv-parser = { version = "0.13.3", path = "sv-parser/sv-parser"}
 once_cell = "1.8"
+futures = "0.3"
 log = "0.4.19"
 tower-lsp = "0.20.0"
 flexi_logger = "0.29.0"
diff --git a/src/core/sv_parser.rs b/src/core/sv_parser.rs
index 35dc85e..0a18797 100644
--- a/src/core/sv_parser.rs
+++ b/src/core/sv_parser.rs
@@ -3,6 +3,7 @@ use std::io::BufRead;
 use std::{collections::HashMap, io::BufReader};
 use std::path::PathBuf;
 use anyhow::Error;
+use log::info;
 use sv_parser::{parse_sv, unwrap_node, ConstantMintypmaxExpression, GateInstantiation, ListOfParameterAssignments, ListOfPortConnections, Locate, PackedDimensionRange, RefNode, SyntaxTree};
 
 use super::fast_hdlparam::{FastHdlparam, Macro};
diff --git a/src/custom_request.rs b/src/custom_request.rs
index 502f447..c7071f9 100644
--- a/src/custom_request.rs
+++ b/src/custom_request.rs
@@ -131,9 +131,22 @@ pub fn do_fast(path: String) -> Result<FastHdlparam> {
 
 
 // 下面是服务端发送给客户端的
+
+#[derive(Serialize, Deserialize)]
+pub struct StringNotification {
+    pub content: String
+}
+
+impl Notification for StringNotification {
+    const METHOD: &'static str = "update/string";
+    type Params = Self;
+}
+
+
 #[derive(Serialize, Deserialize)]
 pub struct UpdateFastNotification {
-    pub fast: FastHdlparam
+    pub fast: FastHdlparam,
+    pub path: String
 }
 
 impl Notification for UpdateFastNotification {
@@ -141,8 +154,16 @@ impl Notification for UpdateFastNotification {
     type Params = Self;
 }
 
-pub fn update_fast_to_client(fast: FastHdlparam) {
+
+pub async fn update_fast_to_client(fast: FastHdlparam, path: &PathBuf) {
+    // info!("send fast to foreend {:?}", fast);
+
+    info!("send fast to foreend");
     let backend = GLOBAL_BACKEND.get().unwrap();
-    let params = UpdateFastNotification { fast };
-    backend.client.send_notification::<UpdateFastNotification>(params);
+    let path = path.to_str().unwrap_or("").to_string();
+    
+    let params = UpdateFastNotification { fast, path };
+    info!("backend client: {:?}", backend.client);
+
+    backend.client.send_notification::<UpdateFastNotification>(params).await;
 }
\ No newline at end of file
diff --git a/src/server.rs b/src/server.rs
index 41e81ff..affd29d 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -1,3 +1,4 @@
+use crate::custom_request::StringNotification;
 use crate::sources::*;
 use crate::completion::keyword::*;
 use flexi_logger::LoggerHandle;
@@ -299,6 +300,7 @@ impl LanguageServer for Backend {
             .log_message(MessageType::INFO, "digital lsp initialized!")
             .await;
 
+        // self.client.send_notification::<StringNotification>(StringNotification { content: "hello from lsp server".to_string() }).await;
     }
     
     async fn shutdown(&self) -> Result<()> {
diff --git a/src/sources.rs b/src/sources.rs
index b88d8e6..dc0fbcb 100644
--- a/src/sources.rs
+++ b/src/sources.rs
@@ -1,11 +1,12 @@
 use crate::core::sv_parser::make_fast_from_syntaxtree;
 use crate::custom_request::update_fast_to_client;
-use crate::custom_request::UpdateFastNotification;
 use crate::definition::def_types::*;
 use crate::definition::get_scopes;
 use crate::diagnostics::{get_diagnostics, is_hidden};
 use crate::server::Backend;
 use crate::server::LSPServer;
+use futures::executor::block_on;
+use log::info;
 use log::{debug, error};
 use pathdiff::diff_paths;
 use ropey::{Rope, RopeSlice};
@@ -13,6 +14,7 @@ use std::cmp::min;
 use std::collections::HashMap;
 use std::env::current_dir;
 use std::fs;
+use std::ops::Deref;
 use std::ops::Range as StdRange;
 use std::path::PathBuf;
 use std::sync::{Arc, Condvar, Mutex, RwLock};
@@ -253,7 +255,9 @@ impl Sources {
                         }
                     };
                     // update_fast_to_client(backend.clone(), fast);
-                    update_fast_to_client(fast);
+                    block_on(async {
+                        update_fast_to_client(fast, &path).await;
+                    });
                 }
 
                 let mut file = source_handle.write().unwrap();
diff --git a/sv-parser b/sv-parser
index af11f5f..4960ea3 160000
--- a/sv-parser
+++ b/sv-parser
@@ -1 +1 @@
-Subproject commit af11f5ff1ef091562d2b17cdf4de3614aedf2286
+Subproject commit 4960ea3fb7c848462ce6e78dbae454ffc775803f