org.apache.flink.runtime.registration

Class RegisteredRpcConnection<F extends Serializable,G extends org.apache.flink.runtime.rpc.RpcGateway,S extends RegistrationResponse.Success,R extends RegistrationResponse.Rejection>

java.lang.Object

org.apache.flink.runtime.registration.RegisteredRpcConnection<F,G,S,R>

Type Parameters:

F - The type of the fencing token

G - The type of the gateway to connect to.

S - The type of the successful registration responses.

R - The type of the registration rejection responses.

Direct Known Subclasses:

TaskExecutorToResourceManagerConnection

public abstract class RegisteredRpcConnection<F extends Serializable,G extends org.apache.flink.runtime.rpc.RpcGateway,S extends RegistrationResponse.Success,R extends RegistrationResponse.Rejection>
extends Object

This utility class implements the basis of RPC connecting from one component to another component, for example the RPC connection from TaskExecutor to ResourceManager. This RegisteredRpcConnection implements registration and get target gateway.

The registration gives access to a future that is completed upon successful registration. The RPC connection can be closed, for example when the target where it tries to register loses leader status.

Field Summary

Fields

Modifier and Type	Field and Description
protected org.slf4j.Logger	log The logger for all log messages of this class.

Constructor Summary

Constructors

Constructor and Description
RegisteredRpcConnection(org.slf4j.Logger log, String targetAddress, F fencingToken, Executor executor)

Method Summary

Modifier and Type	Method and Description
void	close() Close connection.
protected abstract RetryingRegistration<F,G,S,R>	generateRegistration() This method generate a specific Registration, for example TaskExecutor Registration at the ResourceManager.
String	getTargetAddress()
G	getTargetGateway() Gets the RegisteredGateway.
F	getTargetLeaderId()
boolean	isClosed()
boolean	isConnected()
protected abstract void	onRegistrationFailure(Throwable failure) This method handle the Registration failure.
protected abstract void	onRegistrationRejection(R rejection) This method handles the Registration rejection.
protected abstract void	onRegistrationSuccess(S success) This method handle the Registration Response.
void	start()
String	toString()
boolean	tryReconnect() Tries to reconnect to the targetAddress by cancelling the pending registration and starting a new pending registration.

Methods inherited from class java.lang.Object

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

Field Detail

log

protected final org.slf4j.Logger log

The logger for all log messages of this class.

Constructor Detail

RegisteredRpcConnection

public RegisteredRpcConnection(org.slf4j.Logger log,
                               String targetAddress,
                               F fencingToken,
                               Executor executor)

Method Detail

start

public void start()

tryReconnect

public boolean tryReconnect()

Tries to reconnect to the targetAddress by cancelling the pending registration and starting a new pending registration.

Returns:

false if the connection has been closed or a concurrent modification has happened; otherwise true

generateRegistration

protected abstract RetryingRegistration<F,G,S,R> generateRegistration()

This method generate a specific Registration, for example TaskExecutor Registration at the ResourceManager.

onRegistrationSuccess

protected abstract void onRegistrationSuccess(S success)

This method handle the Registration Response.

onRegistrationRejection

protected abstract void onRegistrationRejection(R rejection)

This method handles the Registration rejection.

Parameters:

rejection - rejection containing additional information about the rejection

onRegistrationFailure

protected abstract void onRegistrationFailure(Throwable failure)

This method handle the Registration failure.

close

public void close()

Close connection.

isClosed

public boolean isClosed()

getTargetLeaderId

public F getTargetLeaderId()

getTargetAddress

public String getTargetAddress()

getTargetGateway

public G getTargetGateway()

Gets the RegisteredGateway. This returns null until the registration is completed.

isConnected

public boolean isConnected()

toString

public String toString()

Overrides:

toString in class Object