@Override
public boolean process(String type, String message, Object object) {
Topology topology = (Topology) object;
if (MemberMaintenanceModeEvent.class.getName().equals(type)) {
// Return if topology has not been initialized
if (!TopologyManager.isInitialized()) return false;
// Parse complete message and build event
MemberMaintenanceModeEvent event =
(MemberMaintenanceModeEvent)
MessagingUtil.jsonToObject(message, MemberMaintenanceModeEvent.class);
TopologyUpdater.acquireWriteLockForCluster(event.getServiceName(), event.getClusterId());
try {
return doProcess(event, topology);
} finally {
TopologyUpdater.releaseWriteLockForCluster(event.getServiceName(), event.getClusterId());
}
} else {
if (nextProcessor != null) {
// ask the next processor to take care of the message.
return nextProcessor.process(type, message, topology);
} else {
throw new RuntimeException(
String.format(
"Failed to process message using available message processors: [type] %s [body] %s",
type, message));
}
}
}
private boolean doProcess(MemberMaintenanceModeEvent event, Topology topology) {
String serviceName = event.getServiceName();
String clusterId = event.getClusterId();
// Apply service filter
if (TopologyServiceFilter.apply(serviceName)) {
return false;
}
// Apply cluster filter
if (TopologyClusterFilter.apply(clusterId)) {
return false;
}
// Validate event against the existing topology
Service service = topology.getService(event.getServiceName());
if (service == null) {
if (log.isWarnEnabled()) {
log.warn(String.format("Service does not exist: [service] %s", event.getServiceName()));
}
return false;
}
Cluster cluster = service.getCluster(event.getClusterId());
if (cluster == null) {
if (log.isWarnEnabled()) {
log.warn(
String.format(
"Cluster does not exist: [service] %s [cluster] %s",
event.getServiceName(), event.getClusterId()));
}
return false;
}
// Apply application filter
if (TopologyApplicationFilter.apply(cluster.getAppId())) {
return false;
}
Member member = cluster.getMember(event.getMemberId());
if (member == null) {
if (log.isWarnEnabled()) {
log.warn(
String.format(
"Member does not exist: [service] %s [cluster] %s [member] %s",
event.getServiceName(), event.getClusterId(), event.getMemberId()));
}
return false;
}
// Apply member filter
if (TopologyMemberFilter.apply(member.getLbClusterId(), member.getNetworkPartitionId())) {
return false;
}
if (member.getStatus() == MemberStatus.In_Maintenance) {
if (log.isDebugEnabled()) {
log.debug(
String.format(
"Member already updated as In_Maintenance: "
+ "[service] %s [cluster] %s [member] %s",
event.getServiceName(), event.getClusterId(), event.getMemberId()));
}
} else {
// Apply changes to the topology
if (!member.isStateTransitionValid(MemberStatus.In_Maintenance)) {
log.error(
"Invalid State Transition from "
+ member.getStatus()
+ " to "
+ MemberStatus.In_Maintenance);
}
member.setStatus(MemberStatus.In_Maintenance);
if (log.isInfoEnabled()) {
log.info(
String.format(
"Member updated as In_Maintenance: [service] %s [cluster] %s [member] %s",
event.getServiceName(), event.getClusterId(), event.getMemberId()));
}
}
// Notify event listeners
notifyEventListeners(event);
return true;
}