/**
 * 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.storm.scheduler;

import java.util.HashMap;
import java.util.Map;

import org.apache.storm.Config;
import org.junit.Assert;
import org.junit.Test;

/**
 * Unit tests for {@link Cluster}.
 */
public class ClusterTest {

    /** This should match the value in Cluster.getAssignedMemoryForSlot. */
    final Double TOPOLOGY_WORKER_DEFAULT_MEMORY_ALLOCATION = 768.0;

    private Map<String, Object> getConfig(String key, Object value) {
        Map<String, Object> topConf = getEmptyConfig();
        topConf.put(key, value);
        return topConf;
    }

    private Map<String, Object> getEmptyConfig() {
        Map<String, Object> topConf = new HashMap<>();
        return topConf;
    }

    private Map<String, Object> getPopulatedConfig() {
        Map<String, Object> topConf = new HashMap<>();
        topConf.put(Config.TOPOLOGY_WORKER_GC_CHILDOPTS, "-Xmx128m");
        topConf.put(Config.WORKER_GC_CHILDOPTS, "-Xmx256m");
        topConf.put(Config.TOPOLOGY_WORKER_CHILDOPTS, "-Xmx512m");
        topConf.put(Config.WORKER_CHILDOPTS, "-Xmx768m");
        topConf.put(Config.WORKER_HEAP_MEMORY_MB, 1024);
        topConf.put(Config.TOPOLOGY_WORKER_LOGWRITER_CHILDOPTS, "-Xmx64m");
        return topConf;
    }

    /**
     * Test Cluster.getAssignedMemoryForSlot with a single config value set.
     * @param key - the config key to set
     * @param value - the config value to set
     * @param expectedValue - the expected result
     */
    private void singleValueTest(String key, String value, double expectedValue) {
        Map<String, Object> topConf = getConfig(key, value);
        Assert.assertEquals(expectedValue, Cluster.getAssignedMemoryForSlot(topConf).doubleValue(), 0);
    }

    @Test
    public void getAssignedMemoryForSlot_allNull() {
        Map<String, Object> topConf = getEmptyConfig();
        Assert.assertEquals(TOPOLOGY_WORKER_DEFAULT_MEMORY_ALLOCATION, Cluster.getAssignedMemoryForSlot(topConf));
    }

    @Test
    public void getAssignedMemoryForSlot_topologyWorkerGcChildopts() {
        singleValueTest(Config.TOPOLOGY_WORKER_GC_CHILDOPTS, "-Xmx128m", 128.0);
    }

    @Test
    public void getAssignedMemoryForSlot_workerGcChildopts() {
        singleValueTest(Config.WORKER_GC_CHILDOPTS, "-Xmx256m", 256.0);
    }

    @Test
    public void getAssignedMemoryForSlot_topologyWorkerChildopts() {
        singleValueTest(Config.TOPOLOGY_WORKER_CHILDOPTS, "-Xmx512m", 512.0);
    }

    @Test
    public void getAssignedMemoryForSlot_workerChildopts() {
        singleValueTest(Config.WORKER_CHILDOPTS, "-Xmx768m", 768.0);
    }

    @Test
    public void getAssignedMemoryForSlot_workerHeapMemoryMb() {
        Map<String, Object> topConf = getConfig(Config.WORKER_HEAP_MEMORY_MB, 1024);
        Assert.assertEquals(1024.0, Cluster.getAssignedMemoryForSlot(topConf).doubleValue(), 0);
    }

    @Test
    public void getAssignedMemoryForSlot_topologyWorkerLwChildopts() {
        singleValueTest(Config.TOPOLOGY_WORKER_LOGWRITER_CHILDOPTS, "-Xmx64m", 
                TOPOLOGY_WORKER_DEFAULT_MEMORY_ALLOCATION + 64.0);
    }

    @Test
    public void getAssignedMemoryForSlot_all() {
        Map<String, Object> topConf = getPopulatedConfig();
        Assert.assertEquals(128.0 + 64.0, Cluster.getAssignedMemoryForSlot(topConf).doubleValue(), 0);
    }
}