private void clusterDiscovery()
throws URISyntaxException, ParserConfigurationException, SAXException, IOException {
determineUri();
readClustersXml();
// Now try to join or create cluster
if (clusters != null) {
Clusters.Cluster clusterConfig =
clusters.getCluster(config.get(ClusterSettings.cluster_name));
if (clusterConfig != null) {
for (Clusters.Member member : clusterConfig.getMembers()) {
URI joinUri = new URI("cluster://" + member.getHost());
if (!joinUri.equals(serverId)) {
Future<ClusterConfiguration> config = cluster.join(joinUri);
try {
logger.logMessage("Joined cluster:" + config.get());
try {
updateMyInfo();
} catch (TransformerException e) {
throw new RuntimeException(e);
}
return;
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
logger.logMessage("Could not join cluster member " + member.getHost());
}
}
}
}
// Could not find cluster or not join nodes in cluster - create it!
if (clusterConfig == null) {
clusterConfig = new Clusters.Cluster(config.get(ClusterSettings.cluster_name));
clusters.getClusters().add(clusterConfig);
}
cluster.create(clusterConfig.getName());
if (clusterConfig.getByUri(serverId) == null) {
clusterConfig.getMembers().add(new Clusters.Member(serverId.toString()));
try {
updateMyInfo();
} catch (TransformerException e) {
logger.logMessage("Could not update cluster discovery file:" + clustersUri, e);
}
}
}
}
private void updateMyInfo() throws TransformerException, IOException, SAXException {
Clusters.Cluster cluster = clusters.getCluster(config.get(ClusterSettings.cluster_name));
if (cluster == null) {
clusters
.getClusters()
.add(cluster = new Clusters.Cluster(config.get(ClusterSettings.cluster_name)));
}
if (cluster.contains(serverId)) {
// Do nothing
} else {
// Add myself to list
cluster
.getMembers()
.add(
new Clusters.Member(
serverId.getHost() + (serverId.getPort() == -1 ? "" : ":" + serverId.getPort())));
Document document = new ClustersXMLSerializer(builder).write(clusters);
// Save new version
if (clustersUri.getScheme().equals("file")) {
File clustersFile = new File(clustersUri);
if (clustersFile.lastModified() != clusters.getTimestamp()) {
readClustersXml(); // Re-read XML file
updateMyInfo(); // Try again
return;
}
// Save new version
transformer.transform(new DOMSource(document), new StreamResult(clustersFile));
clusters.setTimestamp(clustersFile.lastModified());
} else {
// TODO Implement HTTP version
}
}
}