BewareMyPower commented on pull request #14346:
URL: https://github.com/apache/pulsar/pull/14346#issuecomment-1044232229
You can use following code to check if the previous doesn't exist as I've
said.
```java
final AtomicBoolean computed = new AtomicBoolean(false);
map.computeIfAbsent("A", __ -> {
computed.set(true); // it's true only when the value is computed
return newValue();
});
```
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