api/topology/src/test/java/org/apache/edgent/test/topology/TopologyTest.java

/*
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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

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package org.apache.edgent.test.topology;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;

import java.util.Date;
import java.util.List;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import org.apache.edgent.execution.Job;
import org.apache.edgent.execution.mbeans.PeriodMXBean;
import org.apache.edgent.execution.services.ControlService;
import org.apache.edgent.execution.services.RuntimeServices;
import org.apache.edgent.function.Supplier;
import org.apache.edgent.topology.TStream;
import org.apache.edgent.topology.Topology;
import org.apache.edgent.topology.tester.Condition;
import org.junit.Ignore;
import org.junit.Test;

@Ignore("abstract, provides common tests for concrete implementations")
public abstract class TopologyTest extends TopologyAbstractTest {

    @Test
    public void testBasics() {
        final Topology t = newTopology("T123");
        assertEquals("T123", t.getName());
        assertSame(t, t.topology());
    }
    
    @Test(expected=IllegalArgumentException.class)
    public void testNullName() {
      newTopology(null);
    }
    
    @Test(expected=IllegalArgumentException.class)
    public void testEmptyName() {
      newTopology("");
    }

    @Test
    public void testDefaultName() {
        final Topology t = newTopology();
        assertSame(t, t.topology());
        assertNotNull(t.getName());
    }

    @Test
    public void testStringContants() throws Exception {

        Topology t = newTopology();

        TStream<String> s = t.strings("a", "b", "c");
        assertStream(t, s);

        Condition<Long> tc = t.getTester().tupleCount(s, 3);
        Condition<List<String>> contents = t.getTester().streamContents(s, "a", "b", "c");
        complete(t, tc);
        assertTrue(contents.valid());
    }

    @Test
    public void testNoStringContants() throws Exception {

        Topology t = newTopology();

        TStream<String> s = t.strings();

        Condition<Long> tc = t.getTester().tupleCount(s, 0);

        complete(t, tc);
        
        assertTrue(tc.valid());
    }
    
    @Test
    public void testRuntimeServices() throws Exception {
        Topology t = newTopology();
        TStream<String> s = t.strings("A");
        
        Supplier<RuntimeServices> serviceGetter =
                t.getRuntimeServiceSupplier();
        
        TStream<Boolean> b = s.map(tuple -> 
            serviceGetter.get().getService(ThreadFactory.class) != null
            && serviceGetter.get().getService(ScheduledExecutorService.class) != null
        );
        
        Condition<List<Boolean>> tc = t.getTester().streamContents(b, Boolean.TRUE);
        complete(t, tc);
        
        assertTrue(tc.valid());
    }
    
    @SuppressWarnings("unchecked")
    @Test
    public void testAdaptablePoll() throws Exception {
        // Ensure the API supporting an adaptable poll() is functional.
        Job job = null;
        try {
            Topology t = newTopology();
            TStream<String> s = t.poll(() -> (new Date()).toString(),
                    1, TimeUnit.HOURS)
                    .alias("myAlias");
            
            AtomicInteger cnt = new AtomicInteger();
            s.peek(tuple -> cnt.incrementAndGet()); 
            
            Future<Job> jf = (Future<Job>) getSubmitter().submit(t);
            job = jf.get();
            assertEquals(Job.State.RUNNING, job.getCurrentState());
            
            setPollFrequency(s, 10, TimeUnit.MILLISECONDS);
            cnt.set(0);
            Thread.sleep(TimeUnit.SECONDS.toMillis(1));
            int curCnt = cnt.get();
            assertTrue("curCnt="+curCnt, curCnt >= 70);
            
            setPollFrequency(s, 100, TimeUnit.MILLISECONDS);
            cnt.set(0);
            Thread.sleep(TimeUnit.SECONDS.toMillis(1));
            curCnt = cnt.get();
            assertTrue("curCnt="+curCnt, curCnt >= 5 && curCnt <= 20);
            
            setPollFrequency(s, 10, TimeUnit.MILLISECONDS);
            cnt.set(0);
            Thread.sleep(TimeUnit.SECONDS.toMillis(1));
            curCnt = cnt.get();
            assertTrue("curCnt="+curCnt, curCnt >= 70);
        }
        finally {
            if (job != null)
                job.stateChange(Job.Action.CLOSE);
        }
        
    }

    static <T> void setPollFrequency(TStream<T> pollStream, long period, TimeUnit unit) {
        ControlService cs = pollStream.topology().getRuntimeServiceSupplier()
                                    .get().getService(ControlService.class);
        PeriodMXBean control = cs.getControl(TStream.TYPE,
                                  pollStream.getAlias(), PeriodMXBean.class);
        control.setPeriod(period, unit);
    }

}