From 941b4d5b8d365653f25937961c4b931ebebd4e6f Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton@traccar.org>
Date: Sat, 28 May 2022 14:18:22 -0700
Subject: Throttle frequent updates (fix #932)

---
 modern/src/store/throttleMiddleware.js | 39 ++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 modern/src/store/throttleMiddleware.js

(limited to 'modern/src/store/throttleMiddleware.js')

diff --git a/modern/src/store/throttleMiddleware.js b/modern/src/store/throttleMiddleware.js
new file mode 100644
index 00000000..9954b139
--- /dev/null
+++ b/modern/src/store/throttleMiddleware.js
@@ -0,0 +1,39 @@
+import { batch } from "react-redux";
+
+const threshold = 3;
+const interval = 1500;
+
+export default () => (next) => {
+  const buffer = [];
+  let throttle = false;
+  let counter = 0;
+  
+  setInterval(() => {
+    console.log('batch');
+    if (throttle) {
+      if (buffer.length < threshold) {
+        throttle = false;
+      }
+      batch(() => buffer.splice(0, buffer.length).forEach((action) => next(action)));
+    } else {
+      if (counter > threshold) {
+        throttle = true;
+      }
+      counter = 0;
+    }
+  }, interval);
+
+  return (action) => {
+    console.log(action);
+    if (action.type === 'devices/update' || action.type === 'positions/update') {
+      if (throttle) {
+        buffer.push(action);
+      } else {
+        counter += 1;
+        return next(action);
+      }
+    } else {
+      return next(action);
+    }
+  };
+};
-- 
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