/*
* 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.ignite.spi.loadbalancing.weightedrandom;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.UUID;
import org.apache.ignite.GridTestJob;
import org.apache.ignite.GridTestTaskSession;
import org.apache.ignite.cluster.ClusterNode;
import org.apache.ignite.internal.util.typedef.internal.U;
import org.apache.ignite.lang.IgniteUuid;
import org.apache.ignite.testframework.GridTestNode;
import org.apache.ignite.testframework.junits.spi.GridSpiAbstractTest;
import org.apache.ignite.testframework.junits.spi.GridSpiTest;
import org.apache.ignite.testframework.junits.spi.GridSpiTestConfig;
import static org.apache.ignite.spi.loadbalancing.weightedrandom.WeightedRandomLoadBalancingSpi.NODE_WEIGHT_ATTR_NAME;
/**
* {@link WeightedRandomLoadBalancingSpi} self test.
*/
@GridSpiTest(spi = WeightedRandomLoadBalancingSpi.class, group = "Load Balancing SPI")
public class GridWeightedRandomLoadBalancingSpiWeightedSelfTest
extends GridSpiAbstractTest<WeightedRandomLoadBalancingSpi> {
/**
* @return {@code True} if node weights should be considered.
*/
@GridSpiTestConfig
public boolean getUseWeights() {
return true;
}
/**
* @throws Exception If test failed.
*/
public void testWeights() throws Exception {
List<ClusterNode> nodes = new ArrayList<>();
for (int i = 0; i < 10; i++) {
GridTestNode node = new GridTestNode(UUID.randomUUID());
node.addAttribute(U.spiAttribute(getSpi(), NODE_WEIGHT_ATTR_NAME), i + 1);
nodes.add(node);
}
// Seal it.
nodes = Collections.unmodifiableList(nodes);
int[] cnts = new int[10];
// Invoke load balancer a large number of times, so statistics won't lie.
for (int i = 0; i < 100000; i++) {
ClusterNode node = getSpi().getBalancedNode(new GridTestTaskSession(IgniteUuid.randomUuid()), nodes,
new GridTestJob());
int weight = (Integer)node.attribute(U.spiAttribute(getSpi(), NODE_WEIGHT_ATTR_NAME));
// Increment number of times a node was picked.
cnts[weight - 1]++;
}
for (int i = 0; i < cnts.length - 1; i++) {
assert cnts[i] < cnts[i + 1] : "Invalid node counts for index [idx=" + i + ", cnts[i]=" + cnts[i] +
", cnts[i+1]=" + cnts[i + 1] + ']';
}
info("Node counts: " + Arrays.toString(cnts));
}
}