dubbo-cluster/src/test/java/org/apache/dubbo/rpc/cluster/loadbalance/ShortestResponseLoadBalanceTest.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.
 */
package org.apache.dubbo.rpc.cluster.loadbalance;

import org.apache.dubbo.rpc.Invoker;

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

public class ShortestResponseLoadBalanceTest extends LoadBalanceBaseTest{

    @Test
    public void testSelectByWeight() {
        int sumInvoker1 = 0;
        int sumInvoker2 = 0;
        int loop = 10000;

        ShortestResponseLoadBalance lb = new ShortestResponseLoadBalance();
        for (int i = 0; i < loop; i++) {
            Invoker selected = lb.select(weightInvokersSR, null, weightTestInvocation);

            if (selected.getUrl().getProtocol().equals("test1")) {
                sumInvoker1++;
            }

            if (selected.getUrl().getProtocol().equals("test2")) {
                sumInvoker2++;
            }
            // never select invoker5 because it's estimated response time is more than invoker1 and invoker2
            Assertions.assertTrue(!selected.getUrl().getProtocol().equals("test5"), "select is not the shortest one");
        }

        // the sumInvoker1 : sumInvoker2 approximately equal to 1: 9
        System.out.println(sumInvoker1);
        System.out.println(sumInvoker2);

        Assertions.assertEquals(sumInvoker1 + sumInvoker2, loop, "select failed!");
    }
}