RoundRobinBalancingPolicyTest.java

/**
 * 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.
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package com.datastax.drivers.jdbc.pool.cassandra.connection;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

import java.util.Arrays;
import java.util.HashSet;

import org.junit.Test;
import org.mockito.Mockito;


public class RoundRobinBalancingPolicyTest extends BaseBalancingPolicyTest {

  private RoundRobinBalancingPolicy roundRobinBalancingPolicy;
  
  @Test
  public void testGetPoolOk() {
    roundRobinBalancingPolicy = new RoundRobinBalancingPolicy();
    assertEquals(poolWith5Active.getNumActive(), roundRobinBalancingPolicy.getPool(pools, null).getNumActive());
    assertEquals(poolWith7Active.getNumActive(), roundRobinBalancingPolicy.getPool(pools, null).getNumActive());
    assertEquals(poolWith10Active.getNumActive(), roundRobinBalancingPolicy.getPool(pools, null).getNumActive());
    assertEquals(poolWith5Active.getNumActive(), roundRobinBalancingPolicy.getPool(pools, null).getNumActive());
    assertEquals(poolWith7Active.getNumActive(), roundRobinBalancingPolicy.getPool(pools, null).getNumActive());
    assertEquals(poolWith10Active.getNumActive(), roundRobinBalancingPolicy.getPool(pools, null).getNumActive());
    assertEquals(poolWith5Active.getNumActive(), roundRobinBalancingPolicy.getPool(pools, null).getNumActive());
    assertEquals(poolWith7Active.getNumActive(), roundRobinBalancingPolicy.getPool(pools, null).getNumActive());
    assertEquals(poolWith10Active.getNumActive(), roundRobinBalancingPolicy.getPool(pools, null).getNumActive());
    // go to 65k to roll the counter a couple of times
    for (int x=0; x<(256*256); x++) {
      assert roundRobinBalancingPolicy.getPool(pools, null).getNumActive() >= 5;      
    }
  }
  
  @Test
  public void testIgnoreExhausted() {
    Mockito.when(poolWith5Active.getCassandraHost()).thenReturn(new CassandraHost("127.0.0.1:9160"));
    Mockito.when(poolWith7Active.getCassandraHost()).thenReturn(new CassandraHost("127.0.0.2:9161"));
    Mockito.when(poolWith10Active.getCassandraHost()).thenReturn(new CassandraHost("127.0.0.3:9162"));
    
    roundRobinBalancingPolicy = new RoundRobinBalancingPolicy();
    assertEquals(poolWith7Active, roundRobinBalancingPolicy.getPool(pools, new HashSet<CassandraHost>(Arrays.asList(new CassandraHost("127.0.0.1:9160")))));
    assertEquals(poolWith10Active, roundRobinBalancingPolicy.getPool(pools, new HashSet<CassandraHost>(Arrays.asList(new CassandraHost("127.0.0.1:9160")))));
    assertEquals(poolWith7Active, roundRobinBalancingPolicy.getPool(pools, new HashSet<CassandraHost>(Arrays.asList(new CassandraHost("127.0.0.1:9160")))));
    assertEquals(poolWith10Active, roundRobinBalancingPolicy.getPool(pools, new HashSet<CassandraHost>(Arrays.asList(new CassandraHost("127.0.0.1:9160")))));
  }
  
  @Test
  public void testIgnoreExhaustedAll() {
    Mockito.when(poolWith5Active.getCassandraHost()).thenReturn(new CassandraHost("127.0.0.1:9160"));
    Mockito.when(poolWith7Active.getCassandraHost()).thenReturn(new CassandraHost("127.0.0.2:9161"));
    Mockito.when(poolWith10Active.getCassandraHost()).thenReturn(new CassandraHost("127.0.0.3:9162"));
    
    roundRobinBalancingPolicy = new RoundRobinBalancingPolicy();
    /*
    assertEquals(poolWith10Active, roundRobinBalancingPolicy.getPool(pools, 
        new HashSet<CassandraHost>(Arrays.asList(new CassandraHost("127.0.0.1:9160"),new CassandraHost("127.0.0.2:9161")))));
    */
    assertNotNull(roundRobinBalancingPolicy.getPool(pools, 
        new HashSet<CassandraHost>(Arrays.asList(new CassandraHost("127.0.0.1:9160"),new CassandraHost("127.0.0.2:9161"),new CassandraHost("127.0.0.3:9162")))));
    
    
  }
}