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 org.apache.cassandra.cql3;
  
  import java.util.Iterator;
  import java.util.concurrent.ThreadLocalRandom;
  
  import org.junit.Test;
  
  import com.datastax.driver.core.*;
  import com.datastax.driver.core.ResultSet;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  public class PagingQueryTest extends CQLTester
  {
      @Test
      public void pagingOnRegularColumn() throws Throwable
      {
          createTable("CREATE TABLE %s (" +
                      " k1 int," +
                      " c1 int," +
                      " c2 int," +
                      " v1 text," +
                      " v2 text," +
                      " v3 text," +
                      " v4 text," +
                      "PRIMARY KEY (k1, c1, c2))");
  
          for (int c1 = 0; c1 < 100; c1++)
          {
              for (int c2 = 0; c2 < 100; c2++)
              {
                  execute("INSERT INTO %s (k1, c1, c2, v1, v2, v3, v4) VALUES (?, ?, ?, ?, ?, ?, ?)", 1, c1, c2,
                          Integer.toString(c1), Integer.toString(c2), someText(), someText());
              }
  
              if (c1 % 30 == 0)
                  flush();
          }
  
          flush();
  
          try (Session session = sessionNet())
          {
              SimpleStatement stmt = new SimpleStatement("SELECT c1, c2, v1, v2 FROM " + KEYSPACE + '.' + currentTable() + " WHERE k1 = 1");
              stmt.setFetchSize(3);
              ResultSet rs = session.execute(stmt);
              Iterator<Row> iter = rs.iterator();
              for (int c1 = 0; c1 < 100; c1++)
              {
                  for (int c2 = 0; c2 < 100; c2++)
                  {
                      assertTrue(iter.hasNext());
                      Row row = iter.next();
                      String msg = "On " + c1 + ',' + c2;
                      assertEquals(msg, c1, row.getInt(0));
                      assertEquals(msg, c2, row.getInt(1));
                      assertEquals(msg, Integer.toString(c1), row.getString(2));
                      assertEquals(msg, Integer.toString(c2), row.getString(3));
                  }
              }
              assertFalse(iter.hasNext());
  
              for (int c1 = 0; c1 < 100; c1++)
              {
                  stmt = new SimpleStatement("SELECT c1, c2, v1, v2 FROM " + KEYSPACE + '.' + currentTable() + " WHERE k1 = 1 AND c1 = ?", c1);
                  stmt.setFetchSize(3);
                  rs = session.execute(stmt);
                  iter = rs.iterator();
                  for (int c2 = 0; c2 < 100; c2++)
                  {
                      assertTrue(iter.hasNext());
                      Row row = iter.next();
                      String msg = "Within " + c1 + " on " + c2;
                      assertEquals(msg, c1, row.getInt(0));
                      assertEquals(msg, c2, row.getInt(1));
                      assertEquals(msg, Integer.toString(c1), row.getString(2));
                      assertEquals(msg, Integer.toString(c2), row.getString(3));
                  }
                  assertFalse(iter.hasNext());
              }
          }
      }
  
      private static String someText()
      {
          char[] arr = new char[1024];
          for (int i = 0; i < arr.length; i++)
              arr[i] = (char)(32 + ThreadLocalRandom.current().nextInt(95));
          return new String(arr);
      }
  }
  