| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.ignite.network; |
| |
| import java.util.Collection; |
| import org.jetbrains.annotations.Nullable; |
| |
| /** |
| * Entry point for obtaining information about a cluster's topology. |
| * |
| * TODO: allow removing event handlers, see https://issues.apache.org/jira/browse/IGNITE-14519 |
| */ |
| public interface TopologyService { |
| /** |
| * Returns information of the current node. |
| * |
| * @return Information about the local network member. |
| */ |
| ClusterNode localMember(); |
| |
| /** |
| * Returns a list of all discovered cluster members, including the local member itself. |
| * |
| * @return List of all discovered cluster members. |
| */ |
| Collection<ClusterNode> allMembers(); |
| |
| /** |
| * Registers a handler for topology change events. |
| * |
| * @param handler Topology events handler. |
| */ |
| void addEventHandler(TopologyEventHandler handler); |
| |
| /** |
| * Returns a cluster node by it's network address in host:port format. |
| * |
| * @param addr The address. |
| * @return The node or {@code null} if the node is not yet discovered or dead. |
| */ |
| @Nullable ClusterNode getByAddress(NetworkAddress addr); |
| } |