opendaylight/md-sal/sal-distributed-datastore/src/test/java/org/opendaylight/controller/cluster/datastore/entityownership/selectionstrategy/LeastLoadedCandidateSelectionStrategyTest.java

   1 /*
   2  * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.controller.cluster.datastore.entityownership.selectionstrategy;
   9
  10 import static org.junit.Assert.assertEquals;
  11 import java.util.ArrayList;
  12 import java.util.Collection;
  13 import java.util.HashMap;
  14 import java.util.Map;
  15 import org.junit.Test;
  16
  17 public class LeastLoadedCandidateSelectionStrategyTest {
  18
  19     @Test
  20     public void testLeastLoadedStrategy(){
  21         LeastLoadedCandidateSelectionStrategy strategy = new LeastLoadedCandidateSelectionStrategy(0L);
  22
  23         String owner = strategy.newOwner(prepareViableCandidates(3), new HashMap<String, Long>());
  24         assertEquals("member-1", owner);
  25
  26         // member-2 has least load
  27         owner = strategy.newOwner(prepareViableCandidates(3), prepareStatistics(5,2,4));
  28         assertEquals("member-2", owner);
  29
  30         // member-3 has least load
  31         owner = strategy.newOwner(prepareViableCandidates(3), prepareStatistics(5,7,4));
  32         assertEquals("member-3", owner);
  33
  34         // member-1 has least load
  35         owner = strategy.newOwner(prepareViableCandidates(3), prepareStatistics(1,7,4));
  36         assertEquals("member-1", owner);
  37
  38     }
  39
  40     private Map<String, Long> prepareStatistics(long... count){
  41         Map<String, Long> statistics = new HashMap<>();
  42         for(int i=0;i<count.length;i++){
  43             statistics.put("member-" + (i+1), count[i]);
  44         }
  45         return statistics;
  46     }
  47
  48     private Collection<String> prepareViableCandidates(int count){
  49         Collection<String> viableCandidates = new ArrayList<>();
  50         for(int i=0;i<count;i++){
  51             viableCandidates.add("member-" + (i+1));
  52         }
  53         return viableCandidates;
  54     }
  55 }