/*
* Copyright 1999-2015 dangdang.com.
* <p>
* Licensed 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.
* </p>
*/
package com.dangdang.ddframe.job.lite.api.strategy.impl;
import com.dangdang.ddframe.job.lite.api.strategy.JobInstance;
import com.dangdang.ddframe.job.lite.api.strategy.JobShardingStrategy;
import org.junit.Test;
import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
public final class AverageAllocationJobShardingStrategyTest {
private final JobShardingStrategy jobShardingStrategy = new AverageAllocationJobShardingStrategy();
@Test
public void shardingForZeroServer() {
assertThat(jobShardingStrategy.sharding(Collections.<JobInstance>emptyList(), "test_job", 3), is(Collections.<JobInstance, List<Integer>>emptyMap()));
}
@Test
public void shardingForOneServer() {
Map<JobInstance, List<Integer>> expected = new LinkedHashMap<>(1, 1);
expected.put(new JobInstance("host0@-@0"), Arrays.asList(0, 1, 2));
assertThat(jobShardingStrategy.sharding(Collections.singletonList(new JobInstance("host0@-@0")), "test_job", 3), is(expected));
}
@Test
public void shardingForServersMoreThanShardingCount() {
Map<JobInstance, List<Integer>> expected = new LinkedHashMap<>(3, 1);
expected.put(new JobInstance("host0@-@0"), Collections.singletonList(0));
expected.put(new JobInstance("host1@-@0"), Collections.singletonList(1));
expected.put(new JobInstance("host2@-@0"), Collections.<Integer>emptyList());
assertThat(jobShardingStrategy.sharding(Arrays.asList(new JobInstance("host0@-@0"), new JobInstance("host1@-@0"), new JobInstance("host2@-@0")), "test_job", 2), is(expected));
}
@Test
public void shardingForServersLessThanShardingCountAliquot() {
Map<JobInstance, List<Integer>> expected = new LinkedHashMap<>(3, 1);
expected.put(new JobInstance("host0@-@0"), Arrays.asList(0, 1, 2));
expected.put(new JobInstance("host1@-@0"), Arrays.asList(3, 4, 5));
expected.put(new JobInstance("host2@-@0"), Arrays.asList(6, 7, 8));
assertThat(jobShardingStrategy.sharding(Arrays.asList(new JobInstance("host0@-@0"), new JobInstance("host1@-@0"), new JobInstance("host2@-@0")), "test_job", 9), is(expected));
}
@Test
public void shardingForServersLessThanShardingCountAliquantFor8ShardingCountAnd3Servers() {
Map<JobInstance, List<Integer>> expected = new LinkedHashMap<>(3, 1);
expected.put(new JobInstance("host0@-@0"), Arrays.asList(0, 1, 6));
expected.put(new JobInstance("host1@-@0"), Arrays.asList(2, 3, 7));
expected.put(new JobInstance("host2@-@0"), Arrays.asList(4, 5));
assertThat(jobShardingStrategy.sharding(Arrays.asList(new JobInstance("host0@-@0"), new JobInstance("host1@-@0"), new JobInstance("host2@-@0")), "test_job", 8), is(expected));
}
@Test
public void shardingForServersLessThanShardingCountAliquantFor10ShardingCountAnd3Servers() {
Map<JobInstance, List<Integer>> expected = new LinkedHashMap<>(3, 1);
expected.put(new JobInstance("host0@-@0"), Arrays.asList(0, 1, 2, 9));
expected.put(new JobInstance("host1@-@0"), Arrays.asList(3, 4, 5));
expected.put(new JobInstance("host2@-@0"), Arrays.asList(6, 7, 8));
assertThat(jobShardingStrategy.sharding(Arrays.asList(new JobInstance("host0@-@0"), new JobInstance("host1@-@0"), new JobInstance("host2@-@0")), "test_job", 10), is(expected));
}
}