providers/direct/src/test/java/org/apache/edgent/test/providers/direct/DirectJobTest.java - incubator-retired-edgent - Git at Google

 /*
 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.edgent.test.providers.direct;

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

 import java.util.Arrays;
 import java.util.Collection;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.AtomicInteger;

 import org.apache.edgent.execution.Configs;
 import org.apache.edgent.execution.Job;
 import org.apache.edgent.graph.Vertex;
 import org.apache.edgent.oplet.Oplet;
 import org.apache.edgent.oplet.core.PeriodicSource;
 import org.apache.edgent.oplet.core.Pipe;
 import org.apache.edgent.providers.direct.DirectProvider;
 import org.apache.edgent.test.topology.TopologyAbstractTest;
 import org.apache.edgent.topology.TStream;
 import org.apache.edgent.topology.Topology;
 import org.junit.Test;

 import com.google.gson.JsonObject;

 public class DirectJobTest extends TopologyAbstractTest implements DirectTestSetup {
     @Test
     public void jobName0() throws Exception {
         String[] data = new String[] {};
         String topologyName = "topoName";
         Topology t = newTopology(topologyName);
         t.strings(data);
         Job job = awaitCompleteExecution(t);
         assertTrue(job.getName().startsWith(topologyName));
     }

     @Test
     public void jobName1() throws Exception {
         String[] data = new String[] {};
         String topologyName = "topoName";
         Topology t = newTopology(topologyName);
         t.strings(data);
         JsonObject config = new JsonObject();
         config.addProperty(Configs.JOB_NAME, (String)null);
         Job job = awaitCompleteExecution(t, config);
         assertTrue(job.getName().startsWith(topologyName));
     }

     @Test
     public void jobName2() throws Exception {
         String[] data = new String[] {};
         String jobName = "testJob";
         Topology t = newTopology();
         t.strings(data);
         JsonObject config = new JsonObject();
         config.addProperty(Configs.JOB_NAME, jobName);
         Job job = awaitCompleteExecution(t, config);
         assertEquals(jobName, job.getName());
     }

     @Test
     public void jobDone0() throws Exception {
         String[] data = new String[] {};
         Topology t = newTopology();
         @SuppressWarnings("unused")
         TStream<String> s = t.strings(data);

         Job job = awaitCompleteExecution(t);
         assertEquals("job.getCurrentState() must be RUNNING", Job.State.RUNNING, job.getCurrentState());
         assertEquals("job.getCurrentState() must be HEALTHY", Job.Health.HEALTHY, job.getHealth());
         assertEquals("", job.getLastError());

         job.stateChange(Job.Action.CLOSE);
         assertEquals("job.getCurrentState() must be CLOSED", Job.State.CLOSED, job.getCurrentState());
         assertEquals("job.getCurrentState() must be HEALTHY", Job.Health.HEALTHY, job.getHealth());
         assertEquals("", job.getLastError());
     }

     @Test
     public void jobDone1() throws Exception {
         String[] data = new String[] {"a", "b", "c"};
         Topology t = newTopology();
         @SuppressWarnings("unused")
         TStream<String> s = t.strings(data);

         Job job = awaitCompleteExecution(t);
         assertEquals("job.getCurrentState() must be RUNNING", Job.State.RUNNING, job.getCurrentState());
         assertEquals("job.getCurrentState() must be HEALTHY", Job.Health.HEALTHY, job.getHealth());
         assertEquals("", job.getLastError());
         job.stateChange(Job.Action.CLOSE);
         assertEquals("job.getCurrentState() must be CLOSED", Job.State.CLOSED, job.getCurrentState());
         assertEquals("job.getCurrentState() must be HEALTHY", Job.Health.HEALTHY, job.getHealth());
         assertEquals("", job.getLastError());
     }

     @Test
     public void jobDone2() throws Exception {
         final int NUM_TUPLES = 1000000;
         Integer[] data = new Integer[NUM_TUPLES];
         AtomicInteger numTuples = new AtomicInteger();

         for (int i = 0; i < data.length; i++) {
             data[i] = new Integer(i);
         }
         Topology t = newTopology();
         TStream<Integer> ints = t.collection(Arrays.asList(data));
         ints.sink(tuple -> numTuples.incrementAndGet());

         Job job = awaitCompleteExecution(t);
         Thread.sleep(1500); // wait for numTuples visibility
         assertEquals(NUM_TUPLES, numTuples.get());
         assertEquals("job.getCurrentState() must be RUNNING", Job.State.RUNNING, job.getCurrentState());
         assertEquals("job.getCurrentState() must be HEALTHY", Job.Health.HEALTHY, job.getHealth());
         assertEquals("", job.getLastError());
         job.stateChange(Job.Action.CLOSE);
         assertEquals("job.getCurrentState() must be CLOSED", Job.State.CLOSED, job.getCurrentState());
         assertEquals("job.getCurrentState() must be HEALTHY", Job.Health.HEALTHY, job.getHealth());
         assertEquals("", job.getLastError());
     }

     @Test
     public void jobPeriodicSource() throws Exception {
         Topology t = newTopology();
         AtomicInteger n = new AtomicInteger(0);
         @SuppressWarnings("unused")
         TStream<Integer> ints = t.poll(() -> n.incrementAndGet(), 100, TimeUnit.MILLISECONDS);

         Future<Job> fj = ((DirectProvider)getTopologyProvider()).submit(t);
         Job job = fj.get();
         assertEquals(Job.State.RUNNING, job.getCurrentState());
         Thread.sleep(TimeUnit.SECONDS.toMillis(2));
         assertTrue(n.get() > 0); // At least one tuple was processed
         job.stateChange(Job.Action.CLOSE);
         assertEquals(Job.State.CLOSED, job.getCurrentState());
     }

     @Test
     public void jobPeriodicSourceCancellation() throws Exception {
         Topology t = newTopology();
         AtomicInteger n = new AtomicInteger(0);
         @SuppressWarnings("unused")
         TStream<Integer> ints = t.poll(() -> n.incrementAndGet(), 500, TimeUnit.MILLISECONDS);

         // Get the source oplet
         Collection<Vertex<? extends Oplet<?, ?>, ?, ?>> vertices = t.graph().getVertices();
         PeriodicSource<?> src = null;
         for (Vertex<? extends Oplet<?, ?>, ?, ?> v : vertices) {
             Oplet<?,?> op = v.getInstance();
             assertTrue(op instanceof PeriodicSource);
             src = (PeriodicSource<?>) op;
             assertEquals(500, src.getPeriod());
             assertSame(TimeUnit.MILLISECONDS, src.getUnit());
         }

         // Submit job
         Future<Job> fj = ((DirectProvider)getTopologyProvider()).submit(t);
         Job job = fj.get();
         assertEquals(Job.State.RUNNING, job.getCurrentState());
         Thread.sleep(TimeUnit.SECONDS.toMillis(1));
         int tupleCount = n.get();
         assertTrue("Expected more tuples than "+ tupleCount, tupleCount > 0); // At least one tuple was processed
         assertEquals(Job.Health.HEALTHY, job.getHealth());
         assertEquals("", job.getLastError());

         // Changing the period cancels the source's task and schedules new one
         src.setPeriod(100);

         Thread.sleep(TimeUnit.SECONDS.toMillis(1));

         // More tuples processed after resetting the period
         assertTrue("Expected more tuples than "+ n.get(), n.get() > 3*tupleCount);

         job.stateChange(Job.Action.CLOSE);
         assertEquals(Job.State.CLOSED, job.getCurrentState());
         assertEquals(Job.Health.HEALTHY, job.getHealth());
         assertEquals("", job.getLastError());
     }

     @Test
     public void jobProcessSource() throws Exception {
         Topology t = newTopology();
         AtomicInteger n = new AtomicInteger(0);
         @SuppressWarnings("unused")
         TStream<Integer> ints = t.generate(() -> n.incrementAndGet());

         Future<Job> fj = ((DirectProvider)getTopologyProvider()).submit(t);
         Job job = fj.get();
         assertEquals(Job.State.RUNNING, job.getCurrentState());
         assertEquals(Job.Health.HEALTHY, job.getHealth());
         assertEquals("", job.getLastError());
         Thread.sleep(TimeUnit.SECONDS.toMillis(2));
         assertTrue(n.get() > 0); // At least one tuple was processed
         job.stateChange(Job.Action.CLOSE);
         assertEquals(Job.State.CLOSED, job.getCurrentState());
         assertEquals(Job.Health.HEALTHY, job.getHealth());
         assertEquals("", job.getLastError());
     }

     @Test(expected = TimeoutException.class)
     public void jobTimesOut() throws Exception {
         Topology t = newTopology();
         AtomicInteger n = new AtomicInteger(0);
         @SuppressWarnings("unused")
         TStream<Integer> ints = t.poll(() -> n.incrementAndGet(), 100, TimeUnit.MILLISECONDS);

         Future<Job> fj = ((DirectProvider)getTopologyProvider()).submit(t);
         Job job = fj.get();
         assertEquals(Job.State.RUNNING, job.getCurrentState());
         try {
             job.complete(700, TimeUnit.MILLISECONDS);
         } finally {
             assertTrue(n.get() > 0); // At least one tuple was processed
             assertEquals(Job.State.RUNNING, job.getCurrentState());
             assertEquals(Job.Health.HEALTHY, job.getHealth());
             assertEquals("", job.getLastError());
         }
     }

     @Test(expected = ExecutionException.class)
     public void jobPeriodicSourceError() throws Exception {
         Topology t = newTopology();
         AtomicInteger n = new AtomicInteger(0);
         TStream<Integer> ints = t.poll(() -> n.incrementAndGet(), 100, TimeUnit.MILLISECONDS);
         ints.pipe(new FailedOplet<Integer>(5, 0));

         Future<Job> fj = ((DirectProvider)getTopologyProvider()).submit(t);
         Job job = fj.get();
         assertEquals(Job.State.RUNNING, job.getCurrentState());
         try {
             job.complete(10, TimeUnit.SECONDS);
         } finally {
             // RUNNING even though execution error
             assertEquals(Job.State.RUNNING, job.getCurrentState());
             assertEquals(Job.Health.UNHEALTHY, job.getHealth());
             assertEquals("java.lang.RuntimeException: Expected Test Exception", job.getLastError());
         }
     }

     @Test(expected = ExecutionException.class)
     public void jobProcessSourceError() throws Exception {
         Topology t = newTopology();
         AtomicInteger n = new AtomicInteger(0);
         TStream<Integer> ints = t.generate(() -> n.incrementAndGet());
         ints.pipe(new FailedOplet<Integer>(12, 100));

         Future<Job> fj = ((DirectProvider)getTopologyProvider()).submit(t);
         Job job = fj.get();
         assertEquals(Job.State.RUNNING, job.getCurrentState());
         try {
             job.complete(10, TimeUnit.SECONDS);
         } finally {
             // RUNNING even though execution error
             assertEquals(Job.State.RUNNING, job.getCurrentState());
             assertEquals(Job.Health.UNHEALTHY, job.getHealth());
             assertEquals("java.lang.RuntimeException: Expected Test Exception", job.getLastError());
         }
     }

     private Job awaitCompleteExecution(Topology t) throws InterruptedException, ExecutionException {
         return awaitCompleteExecution(t, null);
     }

     private Job awaitCompleteExecution(Topology t, JsonObject config) throws InterruptedException, ExecutionException {
         Future<Job> fj = ((DirectProvider)getTopologyProvider()).submit(t, config);
         Job job = fj.get();
         job.complete();
         return job;
     }

     /**
      * Test oplet which fails after receiving a given number of tuples.
      * @param <T>
      */
     @SuppressWarnings("serial")
     private static class FailedOplet<T> extends Pipe<T,T> {
         private final int threshold;
         private final int sleepMillis;

         /**
          * Create test oplet.
          *
          * @param afterTuples number of tuples to receive before failing
          * @param sleepMillis milliseconds of sleep before processing each tuple
          */
         public FailedOplet(int afterTuples, int sleepMillis) {
             if (afterTuples < 0)
                 throw new IllegalArgumentException("afterTuples="+afterTuples);
             if (sleepMillis < 0)
                 throw new IllegalArgumentException("sleepMillis="+sleepMillis);
             this.threshold = afterTuples;
             this.sleepMillis = sleepMillis;
         }

         @Override
         public void close() throws Exception {
         }
         @Override
         public void accept(T tuple) {
             if (sleepMillis > 0) {
                 sleep(sleepMillis);
             }
             injectError(threshold);
             submit(tuple);
         }

         private AtomicInteger count = new AtomicInteger(0);
         protected void injectError(int errorAt) {
             if (count.getAndIncrement() == errorAt)
                 throw new RuntimeException("Expected Test Exception");
         }

         protected static void sleep(long millis) {
             try {
                 Thread.sleep(millis);
             }
             catch (InterruptedException e) {
                 Thread.currentThread().interrupt();
             }
         }
     }
 }
	/*
	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.edgent.test.providers.direct;

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

	import java.util.Arrays;
	import java.util.Collection;
	import java.util.concurrent.ExecutionException;
	import java.util.concurrent.Future;
	import java.util.concurrent.TimeUnit;
	import java.util.concurrent.TimeoutException;
	import java.util.concurrent.atomic.AtomicInteger;

	import org.apache.edgent.execution.Configs;
	import org.apache.edgent.execution.Job;
	import org.apache.edgent.graph.Vertex;
	import org.apache.edgent.oplet.Oplet;
	import org.apache.edgent.oplet.core.PeriodicSource;
	import org.apache.edgent.oplet.core.Pipe;
	import org.apache.edgent.providers.direct.DirectProvider;
	import org.apache.edgent.test.topology.TopologyAbstractTest;
	import org.apache.edgent.topology.TStream;
	import org.apache.edgent.topology.Topology;
	import org.junit.Test;

	import com.google.gson.JsonObject;

	public class DirectJobTest extends TopologyAbstractTest implements DirectTestSetup {
	@Test
	public void jobName0() throws Exception {
	String[] data = new String[] {};
	String topologyName = "topoName";
	Topology t = newTopology(topologyName);
	t.strings(data);
	Job job = awaitCompleteExecution(t);
	assertTrue(job.getName().startsWith(topologyName));
	}

	@Test
	public void jobName1() throws Exception {
	String[] data = new String[] {};
	String topologyName = "topoName";
	Topology t = newTopology(topologyName);
	t.strings(data);
	JsonObject config = new JsonObject();
	config.addProperty(Configs.JOB_NAME, (String)null);
	Job job = awaitCompleteExecution(t, config);
	assertTrue(job.getName().startsWith(topologyName));
	}

	@Test
	public void jobName2() throws Exception {
	String[] data = new String[] {};
	String jobName = "testJob";
	Topology t = newTopology();
	t.strings(data);
	JsonObject config = new JsonObject();
	config.addProperty(Configs.JOB_NAME, jobName);
	Job job = awaitCompleteExecution(t, config);
	assertEquals(jobName, job.getName());
	}

	@Test
	public void jobDone0() throws Exception {
	String[] data = new String[] {};
	Topology t = newTopology();
	@SuppressWarnings("unused")
	TStream<String> s = t.strings(data);

	Job job = awaitCompleteExecution(t);
	assertEquals("job.getCurrentState() must be RUNNING", Job.State.RUNNING, job.getCurrentState());
	assertEquals("job.getCurrentState() must be HEALTHY", Job.Health.HEALTHY, job.getHealth());
	assertEquals("", job.getLastError());

	job.stateChange(Job.Action.CLOSE);
	assertEquals("job.getCurrentState() must be CLOSED", Job.State.CLOSED, job.getCurrentState());
	assertEquals("job.getCurrentState() must be HEALTHY", Job.Health.HEALTHY, job.getHealth());
	assertEquals("", job.getLastError());
	}

	@Test
	public void jobDone1() throws Exception {
	String[] data = new String[] {"a", "b", "c"};
	Topology t = newTopology();
	@SuppressWarnings("unused")
	TStream<String> s = t.strings(data);

	Job job = awaitCompleteExecution(t);
	assertEquals("job.getCurrentState() must be RUNNING", Job.State.RUNNING, job.getCurrentState());
	assertEquals("job.getCurrentState() must be HEALTHY", Job.Health.HEALTHY, job.getHealth());
	assertEquals("", job.getLastError());
	job.stateChange(Job.Action.CLOSE);
	assertEquals("job.getCurrentState() must be CLOSED", Job.State.CLOSED, job.getCurrentState());
	assertEquals("job.getCurrentState() must be HEALTHY", Job.Health.HEALTHY, job.getHealth());
	assertEquals("", job.getLastError());
	}

	@Test
	public void jobDone2() throws Exception {
	final int NUM_TUPLES = 1000000;
	Integer[] data = new Integer[NUM_TUPLES];
	AtomicInteger numTuples = new AtomicInteger();

	for (int i = 0; i < data.length; i++) {
	data[i] = new Integer(i);
	}
	Topology t = newTopology();
	TStream<Integer> ints = t.collection(Arrays.asList(data));
	ints.sink(tuple -> numTuples.incrementAndGet());

	Job job = awaitCompleteExecution(t);
	Thread.sleep(1500); // wait for numTuples visibility
	assertEquals(NUM_TUPLES, numTuples.get());
	assertEquals("job.getCurrentState() must be RUNNING", Job.State.RUNNING, job.getCurrentState());
	assertEquals("job.getCurrentState() must be HEALTHY", Job.Health.HEALTHY, job.getHealth());
	assertEquals("", job.getLastError());
	job.stateChange(Job.Action.CLOSE);
	assertEquals("job.getCurrentState() must be CLOSED", Job.State.CLOSED, job.getCurrentState());
	assertEquals("job.getCurrentState() must be HEALTHY", Job.Health.HEALTHY, job.getHealth());
	assertEquals("", job.getLastError());
	}

	@Test
	public void jobPeriodicSource() throws Exception {
	Topology t = newTopology();
	AtomicInteger n = new AtomicInteger(0);
	@SuppressWarnings("unused")
	TStream<Integer> ints = t.poll(() -> n.incrementAndGet(), 100, TimeUnit.MILLISECONDS);

	Future<Job> fj = ((DirectProvider)getTopologyProvider()).submit(t);
	Job job = fj.get();
	assertEquals(Job.State.RUNNING, job.getCurrentState());
	Thread.sleep(TimeUnit.SECONDS.toMillis(2));
	assertTrue(n.get() > 0); // At least one tuple was processed
	job.stateChange(Job.Action.CLOSE);
	assertEquals(Job.State.CLOSED, job.getCurrentState());
	}

	@Test
	public void jobPeriodicSourceCancellation() throws Exception {
	Topology t = newTopology();
	AtomicInteger n = new AtomicInteger(0);
	@SuppressWarnings("unused")
	TStream<Integer> ints = t.poll(() -> n.incrementAndGet(), 500, TimeUnit.MILLISECONDS);

	// Get the source oplet
	Collection<Vertex<? extends Oplet<?, ?>, ?, ?>> vertices = t.graph().getVertices();
	PeriodicSource<?> src = null;
	for (Vertex<? extends Oplet<?, ?>, ?, ?> v : vertices) {
	Oplet<?,?> op = v.getInstance();
	assertTrue(op instanceof PeriodicSource);
	src = (PeriodicSource<?>) op;
	assertEquals(500, src.getPeriod());
	assertSame(TimeUnit.MILLISECONDS, src.getUnit());
	}

	// Submit job
	Future<Job> fj = ((DirectProvider)getTopologyProvider()).submit(t);
	Job job = fj.get();
	assertEquals(Job.State.RUNNING, job.getCurrentState());
	Thread.sleep(TimeUnit.SECONDS.toMillis(1));
	int tupleCount = n.get();
	assertTrue("Expected more tuples than "+ tupleCount, tupleCount > 0); // At least one tuple was processed
	assertEquals(Job.Health.HEALTHY, job.getHealth());
	assertEquals("", job.getLastError());

	// Changing the period cancels the source's task and schedules new one
	src.setPeriod(100);

	Thread.sleep(TimeUnit.SECONDS.toMillis(1));

	// More tuples processed after resetting the period
	assertTrue("Expected more tuples than "+ n.get(), n.get() > 3*tupleCount);

	job.stateChange(Job.Action.CLOSE);
	assertEquals(Job.State.CLOSED, job.getCurrentState());
	assertEquals(Job.Health.HEALTHY, job.getHealth());
	assertEquals("", job.getLastError());
	}

	@Test
	public void jobProcessSource() throws Exception {
	Topology t = newTopology();
	AtomicInteger n = new AtomicInteger(0);
	@SuppressWarnings("unused")
	TStream<Integer> ints = t.generate(() -> n.incrementAndGet());

	Future<Job> fj = ((DirectProvider)getTopologyProvider()).submit(t);
	Job job = fj.get();
	assertEquals(Job.State.RUNNING, job.getCurrentState());
	assertEquals(Job.Health.HEALTHY, job.getHealth());
	assertEquals("", job.getLastError());
	Thread.sleep(TimeUnit.SECONDS.toMillis(2));
	assertTrue(n.get() > 0); // At least one tuple was processed
	job.stateChange(Job.Action.CLOSE);
	assertEquals(Job.State.CLOSED, job.getCurrentState());
	assertEquals(Job.Health.HEALTHY, job.getHealth());
	assertEquals("", job.getLastError());
	}

	@Test(expected = TimeoutException.class)
	public void jobTimesOut() throws Exception {
	Topology t = newTopology();
	AtomicInteger n = new AtomicInteger(0);
	@SuppressWarnings("unused")
	TStream<Integer> ints = t.poll(() -> n.incrementAndGet(), 100, TimeUnit.MILLISECONDS);

	Future<Job> fj = ((DirectProvider)getTopologyProvider()).submit(t);
	Job job = fj.get();
	assertEquals(Job.State.RUNNING, job.getCurrentState());
	try {
	job.complete(700, TimeUnit.MILLISECONDS);
	} finally {
	assertTrue(n.get() > 0); // At least one tuple was processed
	assertEquals(Job.State.RUNNING, job.getCurrentState());
	assertEquals(Job.Health.HEALTHY, job.getHealth());
	assertEquals("", job.getLastError());
	}
	}

	@Test(expected = ExecutionException.class)
	public void jobPeriodicSourceError() throws Exception {
	Topology t = newTopology();
	AtomicInteger n = new AtomicInteger(0);
	TStream<Integer> ints = t.poll(() -> n.incrementAndGet(), 100, TimeUnit.MILLISECONDS);
	ints.pipe(new FailedOplet<Integer>(5, 0));

	Future<Job> fj = ((DirectProvider)getTopologyProvider()).submit(t);
	Job job = fj.get();
	assertEquals(Job.State.RUNNING, job.getCurrentState());
	try {
	job.complete(10, TimeUnit.SECONDS);
	} finally {
	// RUNNING even though execution error
	assertEquals(Job.State.RUNNING, job.getCurrentState());
	assertEquals(Job.Health.UNHEALTHY, job.getHealth());
	assertEquals("java.lang.RuntimeException: Expected Test Exception", job.getLastError());
	}
	}

	@Test(expected = ExecutionException.class)
	public void jobProcessSourceError() throws Exception {
	Topology t = newTopology();
	AtomicInteger n = new AtomicInteger(0);
	TStream<Integer> ints = t.generate(() -> n.incrementAndGet());
	ints.pipe(new FailedOplet<Integer>(12, 100));

	Future<Job> fj = ((DirectProvider)getTopologyProvider()).submit(t);
	Job job = fj.get();
	assertEquals(Job.State.RUNNING, job.getCurrentState());
	try {
	job.complete(10, TimeUnit.SECONDS);
	} finally {
	// RUNNING even though execution error
	assertEquals(Job.State.RUNNING, job.getCurrentState());
	assertEquals(Job.Health.UNHEALTHY, job.getHealth());
	assertEquals("java.lang.RuntimeException: Expected Test Exception", job.getLastError());
	}
	}

	private Job awaitCompleteExecution(Topology t) throws InterruptedException, ExecutionException {
	return awaitCompleteExecution(t, null);
	}

	private Job awaitCompleteExecution(Topology t, JsonObject config) throws InterruptedException, ExecutionException {
	Future<Job> fj = ((DirectProvider)getTopologyProvider()).submit(t, config);
	Job job = fj.get();
	job.complete();
	return job;
	}

	/**
	* Test oplet which fails after receiving a given number of tuples.
	* @param <T>
	*/
	@SuppressWarnings("serial")
	private static class FailedOplet<T> extends Pipe<T,T> {
	private final int threshold;
	private final int sleepMillis;

	/**
	* Create test oplet.
	*
	* @param afterTuples number of tuples to receive before failing
	* @param sleepMillis milliseconds of sleep before processing each tuple
	*/
	public FailedOplet(int afterTuples, int sleepMillis) {
	if (afterTuples < 0)
	throw new IllegalArgumentException("afterTuples="+afterTuples);
	if (sleepMillis < 0)
	throw new IllegalArgumentException("sleepMillis="+sleepMillis);
	this.threshold = afterTuples;
	this.sleepMillis = sleepMillis;
	}

	@Override
	public void close() throws Exception {
	}
	@Override
	public void accept(T tuple) {
	if (sleepMillis > 0) {
	sleep(sleepMillis);
	}
	injectError(threshold);
	submit(tuple);
	}

	private AtomicInteger count = new AtomicInteger(0);
	protected void injectError(int errorAt) {
	if (count.getAndIncrement() == errorAt)
	throw new RuntimeException("Expected Test Exception");
	}

	protected static void sleep(long millis) {
	try {
	Thread.sleep(millis);
	}
	catch (InterruptedException e) {
	Thread.currentThread().interrupt();
	}
	}
	}
	}