Package org.apache.calcite.avatica.remote

Class JsonHandler

java.lang.Object

org.apache.calcite.avatica.remote.AbstractHandler<java.lang.String>

org.apache.calcite.avatica.remote.JsonHandler

All Implemented Interfaces:

Handler<java.lang.String>

public class JsonHandler
extends AbstractHandler<java.lang.String>

Implementation of Handler that decodes JSON requests, sends them to a Service, and encodes the responses into JSON.

See Also:

JsonService

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.calcite.avatica.remote.Handler

Handler.HandlerResponse<T>

Field Summary

Fields

Modifier and Type	Field	Description
protected static com.fasterxml.jackson.databind.ObjectMapper	MAPPER
(package private) org.apache.calcite.avatica.metrics.MetricsSystem	metrics
(package private) org.apache.calcite.avatica.metrics.Timer	serializationTimer

Fields inherited from class org.apache.calcite.avatica.remote.AbstractHandler

service

Fields inherited from interface org.apache.calcite.avatica.remote.Handler

HANDLER_SERIALIZATION_METRICS_NAME, HTTP_INTERNAL_SERVER_ERROR, HTTP_OK, HTTP_UNAUTHENTICATED, HTTP_UNAUTHORIZED

Constructor Summary

Constructors

Constructor	Description
JsonHandler(Service service, org.apache.calcite.avatica.metrics.MetricsSystem metrics)

Method Summary

Modifier and Type	Method	Description
Handler.HandlerResponse<java.lang.String>	apply(java.lang.String jsonRequest)	Compute a response for the given request, handling errors generated by that computation.
(package private) Service.Request	decode(java.lang.String request)
(package private) java.lang.String	encode(Service.Response response)	Serializes the provided object as JSON.

Methods inherited from class org.apache.calcite.avatica.remote.AbstractHandler

convertToErrorResponse, setRpcMetadata, unauthenticatedErrorResponse, unauthorizedErrorResponse, unwrapException

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MAPPER

protected static final com.fasterxml.jackson.databind.ObjectMapper MAPPER

metrics

final org.apache.calcite.avatica.metrics.MetricsSystem metrics

serializationTimer

final org.apache.calcite.avatica.metrics.Timer serializationTimer

Constructor Detail

JsonHandler

public JsonHandler(Service service,
                   org.apache.calcite.avatica.metrics.MetricsSystem metrics)

Method Detail

apply

public Handler.HandlerResponse<java.lang.String> apply(java.lang.String jsonRequest)

Description copied from class: AbstractHandler

Compute a response for the given request, handling errors generated by that computation.

Specified by:

apply in interface Handler<java.lang.String>

Overrides:

apply in class AbstractHandler<java.lang.String>

Parameters:

jsonRequest - The caller's request.

Returns:

A Service.Response with additional context about that response.

decode

Service.Request decode(java.lang.String request)
                throws java.io.IOException

Specified by:

decode in class AbstractHandler<java.lang.String>

Throws:

java.io.IOException

encode

java.lang.String encode(Service.Response response)
                 throws java.io.IOException

Serializes the provided object as JSON.

Specified by:

encode in class AbstractHandler<java.lang.String>

Parameters:

response - The object to serialize.

Returns:

A JSON string.

Throws:

java.io.IOException