/// <summary>
/// Creates the <see cref="Cluster"/> object to connect to Azure CosmosDB Cassandra API
/// </summary>
/// <param name="hostName">Host name of the CosmosDB account, as shown in the "Connection String" section of Azure Portal</param>
/// <param name="userName">UserName to connect to the CosmosDB account, as shown in the "Connection String" section of Azure Portal</param>
/// <param name="password">
/// Password to connect the CosmosDB account, as shown in the "Connection String" section of Azure Portal.
/// You can use either the "Primary Master ReadWrite" or "Seconday Master ReadWrite" keys here.
/// </param>
public static Cluster CreateClusterForCosmosDB(string hostName, string userName, string password)
{
// Refer https://docs.datastax.com/en/developer/java-driver/2.1/manual/pooling/ for more details
PoolingOptions poolingOptions = new PoolingOptions();
poolingOptions.SetCoreConnectionsPerHost(HostDistance.Local, ClusterBuilderHelpers.CoreConnectionsPerHost);
poolingOptions.SetMaxRequestsPerConnection(ClusterBuilderHelpers.MaxRequestsPerConnection);
poolingOptions.SetMaxConnectionsPerHost(HostDistance.Local, ClusterBuilderHelpers.MaxConnectionsPerHost);
// Increase the page size to Max to avoid multiple pagination calls.
QueryOptions defaultOptions = new QueryOptions();
defaultOptions.SetPageSize(ClusterBuilderHelpers.DefaultPageSize);
// Set a custom host name resolver to ensure that SSL does not fail with RemoteCertificateNameMismatch
// Ensure that we return the same hostname is passed so that it can be matched with the CNAME from the certificate.
SSLOptions sslOptions = new SSLOptions(SslProtocols.Tls12, checkCertificateRevocation: true, remoteCertValidationCallback: ValidateServerCertificate);
sslOptions.SetHostNameResolver((ipAddress) => hostName);
return(Cluster
.Builder()
.WithCredentials(userName, password)
.WithPort(ClusterBuilderHelpers.CosmosDBCassandraPort)
.WithQueryOptions(defaultOptions)
.WithRetryPolicy(new LoggingRetryPolicy(new CosmosDBMultipleRetryPolicy(ClusterBuilderHelpers.MaxRetryOnRateLimiting)))
.AddContactPoint(hostName)
.WithSSL(sslOptions)
.Build());
}