is KmsMasterKeyProvider shareable

Question

I checked the code of the class [KmsMasterKeyProvider](https://aws.github.io/aws-encryption-sdk-java/com/amazonaws/encryptionsdk/kms/KmsMasterKeyProvider.html) there are List, so, I'm a bit unsure if this class can be shared among multiple threads, or if it's a good practice to share it in the first place. Could anyone help me?
I'm using aws-encryption-sdk-java 2.4.1.

Thanks

Didier Durand · Accepted Answer

Hi,

Have a look at the Javadoc: it states clearly that some methods are not thead safe.

See https://aws.github.io/aws-encryption-sdk-java/com/amazonaws/encryptionsdk/kms/KmsMasterKeyProvider.html#:~:text=Method%20Summary&text=This%20method%20is%20inherently%20not,the%20list%20of%20grant%20tokens.

```
This method is inherently not thread safe. Use withGrantTokens(List) or 
KmsMasterKey.setGrantTokens(List) instead. KmsMasterKeyProviders constructed using 
the builder will throw an exception on attempts to modify the list of grant tokens.
```

So, you should avoid this (deprecated) method to become thread safe.

Best,

Didier

is KmsMasterKeyProvider shareable

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