collector/oshi/src/test/java/org/apache/karaf/decanter/collector/oshi/OshiCollectorTest.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.karaf.decanter.collector.oshi;

import org.junit.Assert;
import org.junit.Test;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventAdmin;

import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;

public class OshiCollectorTest {

    static final String SYSTEM_CPU_LOAD_PROPERTY = "processor.systemCpuLoadBetweenTicks";

    @Test
    public void test() throws Exception {
        DispatcherMock dispatcherMock = new DispatcherMock();

        OshiCollector collector = new OshiCollector();
        collector.setDispatcher(dispatcherMock);
        collector.activate(new Hashtable<>());

        collector.run();

        Assert.assertEquals(1, dispatcherMock.postedEvents.size());

        Event event = dispatcherMock.postedEvents.get(0);
        for (String property : event.getPropertyNames()) {
            System.out.println(property + ":" + event.getProperty(property));
        }
    }

   /**
    * Verify the SYSTEM_CPU_LOAD_PROPERTY is null on the initial collector run
    * and not null on subsequent collector runs.
    */
   @Test
   public void testSystemCpuLoad() throws Exception {
        DispatcherMock dispatcherMock = new DispatcherMock();

        OshiCollector collector = new OshiCollector();
        collector.setDispatcher(dispatcherMock);
        collector.activate(new Hashtable<>());

        collector.run();
        collector.run();

        Assert.assertEquals(2, dispatcherMock.postedEvents.size());
        Event firstEvent = dispatcherMock.postedEvents.get(0);
        Assert.assertNull("Initial systemCpuLoadBetweenTicks is null", firstEvent.getProperty(SYSTEM_CPU_LOAD_PROPERTY));
        Event secondEvent = dispatcherMock.postedEvents.get(1);
        Assert.assertNotNull("Second systemCpuLoadBetweenTicks is not null", secondEvent.getProperty(SYSTEM_CPU_LOAD_PROPERTY));
        System.out.println(SYSTEM_CPU_LOAD_PROPERTY + ":" + secondEvent.getProperty(SYSTEM_CPU_LOAD_PROPERTY));
    }

    class DispatcherMock implements EventAdmin {

        public List<Event> postedEvents = new ArrayList<>();
        public List<Event> sentEvents = new ArrayList<>();

        @Override
        public void postEvent(Event event) {
            this.postedEvents.add(event);
        }

        @Override
        public void sendEvent(Event event) {
            this.sentEvents.add(event);
        }
    }

}