Package org.apache.flink.runtime.rest.handler

Class LeaderRetrievalHandler<T extends RestfulGateway>

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>

Type Parameters:

T - type of the leader to retrieve

All Implemented Interfaces:

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

Direct Known Subclasses:

AbstractHandler, StaticFileServerHandler

@Sharable
public abstract class LeaderRetrievalHandler<T extends RestfulGateway>
extends org.apache.flink.shaded.netty4.io.netty.channel.SimpleChannelInboundHandler<RoutedRequest>

SimpleChannelInboundHandler which encapsulates the leader retrieval logic for the REST endpoints.

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

Modifier and Type	Field	Description
protected GatewayRetriever<? extends T>	leaderRetriever
protected org.slf4j.Logger	logger
protected Map<String,String>	responseHeaders
protected Duration	timeout

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	LeaderRetrievalHandler(GatewayRetriever<? extends T> leaderRetriever, Duration timeout, Map<String,String> responseHeaders)

Method Summary

Modifier and Type	Method	Description
protected void	channelRead0(org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext channelHandlerContext, RoutedRequest routedRequest)
protected Duration	getTimeout()
protected abstract void	respondAsLeader(org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext channelHandlerContext, RoutedRequest request, T gateway)

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.shaded.netty4.io.netty.channel.ChannelHandler

handlerAdded, handlerRemoved

Field Detail

logger

protected final org.slf4j.Logger logger

leaderRetriever

protected final GatewayRetriever<? extends T extends RestfulGateway> leaderRetriever

timeout

protected final Duration timeout

responseHeaders

protected final Map<String,String> responseHeaders

Constructor Detail

LeaderRetrievalHandler

protected LeaderRetrievalHandler(@Nonnull
                                 GatewayRetriever<? extends T> leaderRetriever,
                                 @Nonnull
                                 Duration timeout,
                                 @Nonnull
                                 Map<String,String> responseHeaders)

Method Detail

getTimeout

protected Duration getTimeout()

channelRead0

protected void channelRead0(org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext channelHandlerContext,
                            RoutedRequest routedRequest)

Specified by:

channelRead0 in class org.apache.flink.shaded.netty4.io.netty.channel.SimpleChannelInboundHandler<RoutedRequest>

respondAsLeader

protected abstract void respondAsLeader(org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext channelHandlerContext,
                                        RoutedRequest request,
                                        T gateway)
                                 throws Exception

Throws:

Exception