content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.datastax.oss.driver.examples.basic;
  
  import com.datastax.oss.driver.api.core.CqlSession;
  import com.datastax.oss.driver.api.core.metadata.Metadata;
  import com.datastax.oss.driver.api.core.metadata.Node;
  import com.datastax.oss.driver.api.core.metadata.schema.KeyspaceMetadata;
  import com.datastax.oss.driver.api.core.metadata.schema.TableMetadata;
  
  /**
   * Gathers information about a Cassandra cluster's topology (which nodes belong to the cluster) and
   * schema (what keyspaces, tables, etc. exist in this cluster).
   *
   * <p>Preconditions:
   *
   * <ul>
   *   <li>An Apache Cassandra(R) cluster is running and accessible through the contacts points
   *       identified by basic.contact-points (see application.conf).
   * </ul>
   *
   * <p>Side effects: none.
   *
   * @see <a href="https://docs.datastax.com/en/developer/java-driver/4.0">Java Driver online
   *     manual</a>
   */
  public class ReadTopologyAndSchemaMetadata {
  
    public static void main(String[] args) {
  
      try (CqlSession session = CqlSession.builder().build()) {
  
        Metadata metadata = session.getMetadata();
        System.out.printf("Connected session: %s%n", session.getName());
  
        for (Node node : metadata.getNodes().values()) {
          System.out.printf(
              "Datatacenter: %s; Host: %s; Rack: %s%n",
              node.getDatacenter(), node.getEndPoint(), node.getRack());
        }
  
        for (KeyspaceMetadata keyspace : metadata.getKeyspaces().values()) {
          for (TableMetadata table : keyspace.getTables().values()) {
            System.out.printf("Keyspace: %s; Table: %s%n", keyspace.getName(), table.getName());
          }
        }
      }
    }
  }
  