| package org.onlab.onos.store.cluster.messaging; |
| |
| import org.onlab.onos.cluster.NodeId; |
| |
| import java.util.Set; |
| |
| /** |
| * Service for assisting communications between controller cluster nodes. |
| */ |
| public interface ClusterCommunicationService { |
| |
| /** |
| * Sends a message to all controller nodes. |
| * |
| * @param message message to send |
| * @return true if the message was sent sucessfully to all nodes; false |
| * if there is no stream or if there was an error for some node |
| */ |
| boolean send(ClusterMessage message); |
| |
| /** |
| * Sends a message to the specified controller node. |
| * |
| * @param message message to send |
| * @param toNodeId node identifier |
| * @return true if the message was sent sucessfully; false if there is |
| * no stream or if there was an error |
| */ |
| boolean send(ClusterMessage message, NodeId toNodeId); |
| |
| /** |
| * Adds a new subscriber for the specified message subject. |
| * |
| * @param subject message subject |
| * @param subscriber message subscriber |
| */ |
| void addSubscriber(MessageSubject subject, MessageSubscriber subscriber); |
| |
| /** |
| * Removes the specified subscriber from the given message subject. |
| * |
| * @param subject message subject |
| * @param subscriber message subscriber |
| */ |
| void removeSubscriber(MessageSubject subject, MessageSubscriber subscriber); |
| |
| /** |
| * Returns the set of subscribers for the specified message subject. |
| * |
| * @param subject message subject |
| * @return set of message subscribers |
| */ |
| Set<MessageSubscriber> getSubscribers(MessageSubject subject); |
| |
| } |