is KmsMasterKeyProvider shareable

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I checked the code of the class KmsMasterKeyProvider there are List<String>, 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

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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

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