CallCredentials.MetadataApplier (grpc-all 1.63.0 API)

java.lang.Object
- io.grpc.CallCredentials.MetadataApplier

Enclosing class:

CallCredentials
```
public abstract static class CallCredentials.MetadataApplier
extends Object
```
The outlet of the produced headers. Not thread-safe.
Exactly one of its methods must be called to make the RPC proceed.

Constructor Summary

Constructors
Constructor Description

MetadataApplier()

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`abstract void`	`apply(Metadata headers)`	Called when headers are successfully generated.
`abstract void`	`fail(Status status)`	Called when there has been an error when preparing the headers.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - MetadataApplier
```
public MetadataApplier()
```
- Method Detail
  - apply
```
public abstract void apply(Metadata headers)
```
    Called when headers are successfully generated. They will be merged into the original headers.
  - fail
```
public abstract void fail(Status status)
```
    Called when there has been an error when preparing the headers. This will fail the RPC.