SDN Controller Programming Guide

BECOME_MEMBER to BECOME_SUSPEND–Node is not part of the team now

BECOME_MEMBER to BECOME_LEADER–Re-election occurred within the team and the local node

is elected the leader

BECOME_LEADER to BECOME_MEMBER–Re-election occurred within the team and the local node

became a member. New leader detail are notified through NEW_LEADER event

BECOME_LEADER to BECOME_SUSPEND–Node is not part of the team now

Init sequence

First event application receives on controller team join is BECOME_SUSPEND. If the local node is

not part of the team yet, until status change no nofifications are received by the application.

Otherwise one of the following events occur

If the local node is the leader in the controller team application receives BECOME_MEMBER

followed by BECOME_LEADER.

If the local node is the leader, application receives NEW_LEADER notification followed by

BECOME_MEMBER.

Controller applications need to register for health monitor through “Application Service.”

Application Service monitors the health status of all the mandatory applications and feeds the

information to teaming. If any of the application is unhealthy, node is pulled out of the team. All

the registered applications receive BECOME_SUSPENDED notification. Please refer to “Application

Service” section for further detail.

Non mandatory applications are also allowed to join the team using teaming service interfaces.

Availability/non-availability of non mandatory applications doesnt make any difference to the

teaming state of the node. Like mandatory applications, non-mandatory applications also receive

the teaming state change notifications.

Refer to Application Service, for further detail on mandatory & non-mandatory applications.

TeamingService Interface—provides the methods to Join/Leave controller team, trigger election,

read the healthy member information etc., TeamingService runs as an OSGI service. Interested

applications need to reference it and consume its services.

Refer to the JavaDocs for TeamingService interface for the detailed explanation of the methods

provided and corresponding functionality.

TeamingService Example:

import com.hp.sdn.team.TeamingService;

import com.hp.sdn.team.TeamListener;

...

@Component

public class TeamingUser implements TeamListener {

static final String APP_ID = "TeamingUserApp";

@Reference(cardinality=ReferenceCardinality.MANDATORY_UNARY,

policy=ReferencePolicy.DYNAMIC)

private volatile TeamingService teamingService;

@Activate

public void activate() {