bugfix: concurrency issue.

2026-10-18 21:21:01 +08:00 · 2021-12-20 14:20:22 +08:00
parent 2c3d98b6f3
commit e5fdd85558
1 changed files with 9 additions and 4 deletions
@@ -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;
    }