/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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 com.hazelcast.internal.cluster.impl;
import com.hazelcast.cluster.Joiner;
import com.hazelcast.instance.MemberImpl;
import com.hazelcast.instance.Node;
import com.hazelcast.logging.ILogger;
import com.hazelcast.nio.Address;
import com.hazelcast.nio.Packet;
public class NodeMulticastListener implements MulticastListener {
private final Node node;
private final ILogger logger;
private ConfigCheck ourConfig;
public NodeMulticastListener(Node node) {
this.node = node;
this.logger = node.getLogger(NodeMulticastListener.class.getName());
this.ourConfig = node.createConfigCheck();
}
@Override
public void onMessage(Object msg) {
if (!isValidJoinMessage(msg)) {
logDroppedMessage(msg);
return;
}
JoinMessage joinMessage = (JoinMessage) msg;
if (node.isRunning() && node.getClusterService().isJoined()) {
handleActiveAndJoined(joinMessage);
} else {
handleNotActiveOrNotJoined(joinMessage);
}
}
private void logDroppedMessage(Object msg) {
if (logger.isFineEnabled()) {
logger.fine("Dropped: " + msg);
}
}
private void handleActiveAndJoined(JoinMessage joinMessage) {
if (!(joinMessage instanceof JoinRequest)) {
logDroppedMessage(joinMessage);
return;
}
ClusterServiceImpl clusterService = node.getClusterService();
Address masterAddress = clusterService.getMasterAddress();
if (clusterService.isMaster()) {
JoinMessage response = new JoinMessage(Packet.VERSION, node.getBuildInfo().getBuildNumber(), node.getVersion(),
node.getThisAddress(), node.getThisUuid(), node.isLiteMember(), node.createConfigCheck());
node.multicastService.send(response);
} else if (joinMessage.getAddress().equals(masterAddress)) {
MemberImpl master = node.getClusterService().getMember(masterAddress);
if (master != null && !master.getUuid().equals(joinMessage.getUuid())) {
String message = "New join request has been received from current master. Suspecting " + masterAddress;
logger.warning(message);
// I just make a local suspicion. Probably other nodes will eventually suspect as well.
clusterService.suspectMember(master, message, false);
}
}
}
private void handleNotActiveOrNotJoined(JoinMessage joinMessage) {
if (isJoinRequest(joinMessage)) {
Joiner joiner = node.getJoiner();
if (joiner instanceof MulticastJoiner) {
MulticastJoiner multicastJoiner = (MulticastJoiner) joiner;
multicastJoiner.onReceivedJoinRequest((JoinRequest) joinMessage);
} else {
logDroppedMessage(joinMessage);
}
} else {
Address address = joinMessage.getAddress();
if (node.getJoiner().isBlacklisted(address)) {
logDroppedMessage(joinMessage);
return;
}
ClusterServiceImpl clusterService = node.getClusterService();
if (!clusterService.isJoined() && clusterService.getMasterAddress() == null) {
clusterService.setMasterAddressToJoin(joinMessage.getAddress());
} else {
logDroppedMessage(joinMessage);
}
}
}
private boolean isJoinRequest(JoinMessage joinMessage) {
return joinMessage instanceof JoinRequest;
}
private boolean isJoinMessage(Object msg) {
return msg != null && msg instanceof JoinMessage && !(msg instanceof SplitBrainJoinMessage);
}
private boolean isValidJoinMessage(Object msg) {
if (!isJoinMessage(msg)) {
return false;
}
JoinMessage joinMessage = (JoinMessage) msg;
if (isMessageToSelf(joinMessage)) {
return false;
}
ConfigCheck theirConfig = joinMessage.getConfigCheck();
if (!ourConfig.isSameGroup(theirConfig)) {
return false;
}
return true;
}
private boolean isMessageToSelf(JoinMessage joinMessage) {
Address thisAddress = node.getThisAddress();
return thisAddress == null || thisAddress.equals(joinMessage.getAddress());
}
}