sashapolo commented on code in PR #722: URL: https://github.com/apache/ignite-3/pull/722#discussion_r844062625
########## modules/cluster-management/src/main/java/org/apache/ignite/internal/cluster/management/raft/CmgRaftService.java: ########## @@ -0,0 +1,146 @@ +/* + * 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.internal.cluster.management.raft; + +import java.util.Collection; +import java.util.List; +import java.util.Set; +import java.util.concurrent.CompletableFuture; +import java.util.stream.Collectors; +import org.apache.ignite.internal.cluster.management.raft.commands.NodeJoinCommand; +import org.apache.ignite.internal.cluster.management.raft.commands.NodeLeaveCommand; +import org.apache.ignite.internal.cluster.management.raft.commands.ReadLogicalTopologyCommand; +import org.apache.ignite.internal.cluster.management.raft.commands.ReadStateCommand; +import org.apache.ignite.internal.cluster.management.raft.commands.WriteStateCommand; +import org.apache.ignite.internal.cluster.management.raft.responses.JoinDeniedResponse; +import org.apache.ignite.internal.cluster.management.raft.responses.LogicalTopologyResponse; +import org.apache.ignite.lang.IgniteInternalException; +import org.apache.ignite.network.ClusterNode; +import org.apache.ignite.network.ClusterService; +import org.apache.ignite.raft.client.Peer; +import org.apache.ignite.raft.client.service.RaftGroupService; + +/** + * A wrapper around a {@link RaftGroupService} providing helpful methods for working with the CMG. + */ +public class CmgRaftService { + private final RaftGroupService raftService; + + private final ClusterService clusterService; + + public CmgRaftService(RaftGroupService raftService, ClusterService clusterService) { + this.raftService = raftService; + this.clusterService = clusterService; + } + + /** + * Returns {@code true} if the current node is the CMG leader. + * + * @return {@code true} if the current node is the CMG leader. + */ + // TODO: replace with onLeaderElected callback after https://issues.apache.org/jira/browse/IGNITE-16379 is implemented + public CompletableFuture<Boolean> isCurrentNodeLeader() { + ClusterNode thisNode = clusterService.topologyService().localMember(); + + return leader().thenApply(thisNode::equals); + } + + private CompletableFuture<ClusterNode> leader() { + return raftService.refreshLeader().thenApply(v -> resolvePeer(raftService.leader())); + } + + /** + * Retrieves the cluster state. + * + * @return Future that resolves into the current cluster state or {@code null} if it does not exist. + */ + public CompletableFuture<ClusterState> readClusterState() { + return raftService.run(new ReadStateCommand()) + .thenApply(ClusterState.class::cast); + } + + /** + * Saves the given {@link ClusterState}. + * + * @param clusterState Cluster state. + * @return Future that represents the state of the operation. + */ + public CompletableFuture<Void> writeClusterState(ClusterState clusterState) { + return raftService.run(new WriteStateCommand(clusterState)); + } + + /** + * Sends a {@link NodeJoinCommand} thus adding the current node to the local topology. + * + * @return Future that represents the state of the operation. + */ + public CompletableFuture<Void> joinCluster() { + ClusterNode localMember = clusterService.topologyService().localMember(); + + return raftService.run(new NodeJoinCommand(localMember)) + .thenAccept(response -> { + if (response instanceof JoinDeniedResponse) { Review Comment: yes, since node validation is not implemented yet, a node cannot be rejected -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
