public static boolean isClusterActive() {
try {
Builder builder =
Cluster.builder()
.withQueryOptions(
new QueryOptions()
.setConsistencyLevel(ConsistencyLevel.QUORUM)
.setSerialConsistencyLevel(ConsistencyLevel.LOCAL_SERIAL));
cluster = builder.addContactPoint("127.0.0.1").build();
session = cluster.connect();
return true;
} catch (Exception e) {
return false;
}
}
public static Cluster createCluster(CassandraConfiguration config) throws DataSourceException {
boolean debugEnabled = false;
if (log.isDebugEnabled()) {
debugEnabled = true;
}
String userName = config.getUsername();
String password = config.getPassword();
List<String> connections = config.getHosts();
String clusterName = config.getClusterName();
int port = config.getPort();
boolean jmxDisabled = config.getJmxDisabled();
if (userName == null || password == null) {
throw new DataSourceException("Can't create cluster with empty userName or Password");
}
if (clusterName == null) {
throw new DataSourceException("Can't create cluster with empty cluster name");
}
if (connections == null || connections.isEmpty()) {
throw new DataSourceException("Can't create cluster with empty connection string");
}
int maxConnections = config.getMaxConnections();
int concurrency = config.getConcurrency();
boolean async = config.getAsync();
String compression = config.getCompression();
StringBuilder configProps = new StringBuilder();
configProps
.append(" concurrency: " + concurrency)
.append("\n mode: " + (async ? "asynchronous" : "blocking"))
.append("\n per-host connections: " + maxConnections)
.append("\n compression: " + compression);
if (debugEnabled) {
log.debug(configProps.toString());
}
Cluster cluster = null;
try {
PoolingOptions poolOptions = CassandraDatasourceUtils.createPoolingOptions(config);
SocketOptions socketOptions = CassandraDatasourceUtils.createSocketOptions(config);
// Create cluster
Builder builder = Cluster.builder();
for (String con : connections) {
builder.addContactPoints(con);
}
builder
.withPoolingOptions(poolOptions)
.withSocketOptions(socketOptions)
.withPort(port)
.withCredentials(userName, password);
CassandraDatasourceUtils.createRetryPolicy(config, builder);
CassandraDatasourceUtils.createReconnectPolicy(config, builder);
CassandraDatasourceUtils.createLoadBalancingPolicy(config, builder);
if (jmxDisabled) {
builder.withoutMetrics();
builder.withoutJMXReporting();
}
if (ProtocolOptions.Compression.SNAPPY.name().equalsIgnoreCase(compression)) {
builder.withCompression(ProtocolOptions.Compression.SNAPPY);
} else {
builder.withCompression(ProtocolOptions.Compression.NONE);
}
cluster = builder.build();
// validate cluster information after connect
StringBuilder metaDataAfterConnect = new StringBuilder();
Set<Host> allHosts = cluster.getMetadata().getAllHosts();
for (Host h : allHosts) {
metaDataAfterConnect.append("[");
metaDataAfterConnect.append(h.getDatacenter());
metaDataAfterConnect.append("-");
metaDataAfterConnect.append(h.getRack());
metaDataAfterConnect.append("-");
metaDataAfterConnect.append(h.getAddress());
metaDataAfterConnect.append("]\n");
}
if (debugEnabled) {
log.debug("Cassandra Cluster: " + metaDataAfterConnect.toString());
}
} catch (NoHostAvailableException ex) {
throw new DataSourceException(" No Host available to access ", ex);
} catch (Exception ex) {
throw new DataSourceException(" Can not create cluster ", ex);
}
return cluster;
}
