@Override
public boolean process(String type, String message, Object object) {
Topology topology = (Topology) object;
if (ClusterCreatedEvent.class.getName().equals(type)) {
// Return if topology has not been initialized
if (!TopologyManager.isInitialized()) {
return false;
}
// Parse complete message and build event
ClusterCreatedEvent event =
(ClusterCreatedEvent) MessagingUtil.jsonToObject(message, ClusterCreatedEvent.class);
String serviceName = event.getCluster().getServiceName();
TopologyUpdater.acquireWriteLockForService(serviceName);
try {
return doProcess(event, topology);
} finally {
TopologyUpdater.releaseWriteLockForService(serviceName);
}
} 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(ClusterCreatedEvent event, Topology topology) {
Cluster cluster = event.getCluster();
String applicationId = cluster.getAppId();
String serviceName = cluster.getServiceName();
String clusterId = cluster.getClusterId();
// Apply application filter
if (TopologyApplicationFilter.apply(applicationId)) {
return false;
}
// 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(serviceName);
if (service == null) {
if (log.isWarnEnabled()) {
log.warn(String.format("Service does not exist: [service] %s", serviceName));
}
return false;
}
if (service.clusterExists(clusterId)) {
if (log.isDebugEnabled()) {
log.debug(
String.format(
"Cluster already exists in service: [service] %s " + "[cluster] %s",
serviceName, clusterId));
}
} else {
// Apply changes to the topology
service.addCluster(cluster);
if (log.isInfoEnabled()) {
log.info(String.format("Cluster created: %s", cluster.toString()));
}
}
// Notify event listeners
notifyEventListeners(event);
return true;
}