org.apache.flink.runtime.rest.handler.async

Class AbstractAsynchronousOperationHandlers.TriggerHandler<T extends RestfulGateway,B extends RequestBody,M extends MessageParameters>

java.lang.Object

org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerAdapter

org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandlerAdapter

org.apache.flink.shaded.netty4.io.netty.channel.SimpleChannelInboundHandler<RoutedRequest>

org.apache.flink.runtime.rest.handler.LeaderRetrievalHandler<T>

org.apache.flink.runtime.rest.handler.AbstractHandler<T,R,M>

org.apache.flink.runtime.rest.handler.AbstractRestHandler<T,B,TriggerResponse,M>

org.apache.flink.runtime.rest.handler.async.AbstractAsynchronousOperationHandlers.TriggerHandler<T,B,M>

Type Parameters:

T - type of the gateway

B - type of the request

M - type of the message parameters

All Implemented Interfaces:

AutoCloseable, org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler, org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandler, AutoCloseableAsync

Direct Known Subclasses:

ClusterDataSetDeleteHandlers.ClusterDataSetDeleteTriggerHandler, RescalingHandlers.RescalingTriggerHandler, SavepointDisposalHandlers.SavepointDisposalTriggerHandler

Enclosing class:

AbstractAsynchronousOperationHandlers<K extends OperationKey,R extends Serializable>

protected abstract class AbstractAsynchronousOperationHandlers.TriggerHandler<T extends RestfulGateway,B extends RequestBody,M extends MessageParameters>
extends AbstractRestHandler<T,B,TriggerResponse,M>

Handler which is responsible for triggering an asynchronous operation. After the operation has been triggered, it stores the result future in the AbstractAsynchronousOperationHandlers.completedOperationCache.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler

org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler.Sharable

Field Summary

Fields inherited from class org.apache.flink.runtime.rest.handler.AbstractHandler

log, MAPPER

Fields inherited from class org.apache.flink.runtime.rest.handler.LeaderRetrievalHandler

leaderRetriever, logger, responseHeaders, timeout

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	TriggerHandler(GatewayRetriever<? extends T> leaderRetriever, Time timeout, Map<String,String> responseHeaders, MessageHeaders<B,TriggerResponse,M> messageHeaders)

Method Summary

Modifier and Type	Method and Description
protected abstract K	createOperationKey(HandlerRequest<B> request) Create the operation key under which the result future of the asynchronous operation will be stored.
CompletableFuture<TriggerResponse>	handleRequest(HandlerRequest<B> request, T gateway) This method is called for every incoming request and returns a CompletableFuture containing a the response.
protected abstract CompletableFuture<R>	triggerOperation(HandlerRequest<B> request, T gateway) Trigger the asynchronous operation and return its future result.

Methods inherited from class org.apache.flink.runtime.rest.handler.AbstractRestHandler

getMessageHeaders, respondToRequest

Methods inherited from class org.apache.flink.runtime.rest.handler.AbstractHandler

closeAsync, closeHandlerAsync, respondAsLeader

Methods inherited from class org.apache.flink.runtime.rest.handler.LeaderRetrievalHandler

channelRead0

Methods inherited from class org.apache.flink.shaded.netty4.io.netty.channel.SimpleChannelInboundHandler

acceptInboundMessage, channelRead

Methods inherited from class org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelInactive, channelReadComplete, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught, userEventTriggered

Methods inherited from class org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, handlerAdded, handlerRemoved, isSharable

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.util.AutoCloseableAsync

close

Methods inherited from interface org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler

handlerAdded, handlerRemoved

Constructor Detail

TriggerHandler

protected TriggerHandler(GatewayRetriever<? extends T> leaderRetriever,
                         Time timeout,
                         Map<String,String> responseHeaders,
                         MessageHeaders<B,TriggerResponse,M> messageHeaders)

Method Detail

handleRequest

public CompletableFuture<TriggerResponse> handleRequest(@Nonnull
                                                        HandlerRequest<B> request,
                                                        @Nonnull
                                                        T gateway)
                                                 throws RestHandlerException

Description copied from class: AbstractRestHandler

This method is called for every incoming request and returns a CompletableFuture containing a the response.

Implementations may decide whether to throw RestHandlerExceptions or fail the returned CompletableFuture with a RestHandlerException.

Failing the future with another exception type or throwing unchecked exceptions is regarded as an implementation error as it does not allow us to provide a meaningful HTTP status code. In this case a HttpResponseStatus.INTERNAL_SERVER_ERROR will be returned.

Specified by:

handleRequest in class AbstractRestHandler<T extends RestfulGateway,B extends RequestBody,TriggerResponse,M extends MessageParameters>

Parameters:

request - request that should be handled

gateway - leader gateway

Returns:

future containing a handler response

Throws:

RestHandlerException - if the handling failed

triggerOperation

protected abstract CompletableFuture<R> triggerOperation(HandlerRequest<B> request,
                                                         T gateway)
                                                  throws RestHandlerException

Trigger the asynchronous operation and return its future result.

Parameters:

request - with which the trigger handler has been called

gateway - to the leader

Returns:

Future result of the asynchronous operation

Throws:

RestHandlerException - if something went wrong

createOperationKey

protected abstract K createOperationKey(HandlerRequest<B> request)

Create the operation key under which the result future of the asynchronous operation will be stored.

Parameters:

request - with which the trigger handler has been called.

Returns:

Operation key under which the result future will be stored