org.apache.storm.messaging

Interface IContext

All Known Implementing Classes:

Context, Context

public interface IContext

This interface needs to be implemented for messaging plugin.

Messaging plugin is specified via Storm config parameter, storm.messaging.transport.

A messaging plugin should have a default constructor and implements IContext interface. Upon construction, we will invoke IContext::prepare(topoConf) to enable context to be configured according to storm configuration.

Method Summary

Modifier and Type	Method and Description
IConnection	bind(String stormId, int port, IConnectionCallback cb, Supplier<Object> newConnectionResponse) This method establishes a server side connection.
IConnection	connect(String stormId, String host, int port, AtomicBoolean[] remoteBpStatus) This method establish a client side connection to a remote server implementation should return a new connection every call.
void	prepare(Map<String,Object> topoConf) This method is invoked at the startup of messaging plugin.
void	term() This method is invoked when a worker is unloading a messaging plugin.

Method Detail

prepare

void prepare(Map<String,Object> topoConf)

This method is invoked at the startup of messaging plugin.

Parameters:

topoConf - storm configuration

term

void term()

This method is invoked when a worker is unloading a messaging plugin.

bind

IConnection bind(String stormId,
                 int port,
                 IConnectionCallback cb,
                 Supplier<Object> newConnectionResponse)

This method establishes a server side connection.

Parameters:

stormId - topology ID

port - port #

cb - The callback to deliver received messages to

newConnectionResponse - Supplier of the initial message to send to new client connections

Returns:

server side connection

connect

IConnection connect(String stormId,
                    String host,
                    int port,
                    AtomicBoolean[] remoteBpStatus)

This method establish a client side connection to a remote server implementation should return a new connection every call.

Parameters:

stormId - topology ID

host - remote host

port - remote port

remoteBpStatus - array of booleans reflecting Back Pressure status of remote tasks.

Returns:

client side connection