Handler (Apache Calcite Avatica 1.15.0 API)

Type Parameters:

T - The type this handler accepts and returns

All Known Implementing Classes:

AbstractHandler, JsonHandler, ProtobufHandler
```
public interface Handler<T>
```
API for text request-response calls to an Avatica server.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static class Handler.HandlerResponse<T>
Struct that encapsulates the context of the result of a request to Avatica.

Field Summary

Fields
Modifier and Type	Field	Description
`static java.lang.String`	`HANDLER_SERIALIZATION_METRICS_NAME`
`static int`	`HTTP_INTERNAL_SERVER_ERROR`
`static int`	`HTTP_OK`
`static int`	`HTTP_UNAUTHENTICATED`
`static int`	`HTTP_UNAUTHORIZED`

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Handler.HandlerResponse<T>`	`apply(T request)`
`void`	`setRpcMetadata(Service.RpcMetadataResponse metadata)`	Sets some general server information to return to the client in all responses.

- Field Detail
  - HTTP_OK
```
static final int HTTP_OK
```
    See Also:
    
    Constant Field Values
  - HTTP_UNAUTHENTICATED
```
static final int HTTP_UNAUTHENTICATED
```
    See Also:
    
    Constant Field Values
  - HTTP_UNAUTHORIZED
```
static final int HTTP_UNAUTHORIZED
```
    See Also:
    
    Constant Field Values
  - HTTP_INTERNAL_SERVER_ERROR
```
static final int HTTP_INTERNAL_SERVER_ERROR
```
    See Also:
    
    Constant Field Values
  - HANDLER_SERIALIZATION_METRICS_NAME
```
static final java.lang.String HANDLER_SERIALIZATION_METRICS_NAME
```
    See Also:
    
    Constant Field Values
- Method Detail
  - apply
```
Handler.HandlerResponse<T> apply(T request)
```
  - setRpcMetadata
```
void setRpcMetadata(Service.RpcMetadataResponse metadata)
```
    Sets some general server information to return to the client in all responses.
    
    Parameters:
    
    metadata - Server-wide information