From e5fdd855587dee3da41f3cb9bc66d2e368403ae5 Mon Sep 17 00:00:00 2001
From: cgspine <cgspine@gmail.com>
Date: Mon, 20 Dec 2021 14:20:22 +0800
Subject: [PATCH] bugfix: concurrency issue.

---
 .../java/com/qmuiteam/qmui/util/OnceReadValue.java  | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/qmui/src/main/java/com/qmuiteam/qmui/util/OnceReadValue.java b/qmui/src/main/java/com/qmuiteam/qmui/util/OnceReadValue.java
index b844b949..a52cf6b9 100644
--- a/qmui/src/main/java/com/qmuiteam/qmui/util/OnceReadValue.java
+++ b/qmui/src/main/java/com/qmuiteam/qmui/util/OnceReadValue.java
@@ -2,13 +2,18 @@ package com.qmuiteam.qmui.util;
 
 public abstract class OnceReadValue<P, T> {
 
-    private boolean isRead = false;
+    private volatile boolean isRead = false;
     private T cacheValue;
 
     public T get(P param){
-        if(!isRead){
-            isRead = true;
-            cacheValue = read(param);
+        if(isRead){
+            return cacheValue;
+        }
+        synchronized (this){
+            if(!isRead){
+                cacheValue = read(param);
+                isRead = true;
+            }
         }
         return cacheValue;
     }