core: Make MetadataApplier an interface again#5007
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Swapping MetadataApplier to an abstract class is not ABI-safe for callers. So I revert back to the previous interface definition and introduce a CallCredentials2.MetadataApplier which is an abstract class. Once everyone is on CallCredentials2 then we can swap it to an abstract class again. Fixes grpc#5002
zhangkun83
approved these changes
Oct 26, 2018
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Swapping MetadataApplier to an abstract class is not ABI-safe for
callers. So I revert back to the previous interface definition and
introduce a CallCredentials2.MetadataApplier which is an abstract class.
Once everyone is on CallCredentials2 then we can swap it to an abstract
class again.
Fixes #5002
CC @njhill (Thank you so much for reporting the issue)