Examples with Context io.mantisrx.runtime.Context used on opensource projects

Example 6 with Context

use of io.mantisrx.runtime.Context in project mantis by Netflix.

the class WorkerExecutionOperationsNetworkStage method executeStage.

@SuppressWarnings({ "rawtypes", "unchecked" })
@Override
public void executeStage(final ExecutionDetails setup) {
    ExecuteStageRequest executionRequest = setup.getExecuteStageRequest().getRequest();
    // Initialize the schedulingInfo observable for current job and mark it shareable to be reused by anyone interested in this data.
    // Observable<JobSchedulingInfo> selfSchedulingInfo = mantisMasterApi.schedulingChanges(executionRequest.getJobId()).switchMap((e) -> Observable.just(e).repeatWhen(x -> x.delay(5 , TimeUnit.SECONDS))).subscribeOn(Schedulers.io()).share();
    Observable<JobSchedulingInfo> selfSchedulingInfo = mantisMasterApi.schedulingChanges(executionRequest.getJobId()).subscribeOn(Schedulers.io()).share();
    WorkerInfo workerInfo = generateWorkerInfo(executionRequest.getJobName(), executionRequest.getJobId(), executionRequest.getStage(), executionRequest.getWorkerIndex(), executionRequest.getWorkerNumber(), executionRequest.getDurationType(), "host", executionRequest.getWorkerPorts());
    final Observable<Integer> sourceStageTotalWorkersObs = createSourceStageTotalWorkersObservable(selfSchedulingInfo);
    RunningWorker.Builder rwBuilder = new RunningWorker.Builder().job(setup.getMantisJob()).schedulingInfo(executionRequest.getSchedulingInfo()).stageTotalWorkersObservable(sourceStageTotalWorkersObs).jobName(executionRequest.getJobName()).stageNum(executionRequest.getStage()).workerIndex(executionRequest.getWorkerIndex()).workerNum(executionRequest.getWorkerNumber()).totalStages(executionRequest.getTotalNumStages()).metricsPort(executionRequest.getMetricsPort()).ports(executionRequest.getPorts().iterator()).jobStatusObserver(setup.getStatus()).requestSubject(setup.getExecuteStageRequest().getRequestSubject()).workerInfo(workerInfo).vmTaskStatusObservable(vmTaskStatusObserver).hasJobMaster(executionRequest.getHasJobMaster()).jobId(executionRequest.getJobId());
    if (executionRequest.getStage() == 0) {
        rwBuilder = rwBuilder.stage(new JobMasterStageConfig("jobmasterconfig"));
    } else {
        rwBuilder = rwBuilder.stage((StageConfig) setup.getMantisJob().getStages().get(executionRequest.getStage() - 1));
    }
    final RunningWorker rw = rwBuilder.build();
    AtomicReference<SubscriptionStateHandler> subscriptionStateHandlerRef = new AtomicReference<>();
    if (rw.getStageNum() == rw.getTotalStagesNet()) {
        // set up subscription state handler only for sink (last) stage
        subscriptionStateHandlerRef.set(setupSubscriptionStateHandler(setup.getExecuteStageRequest().getRequest().getJobId(), mantisMasterApi, setup.getExecuteStageRequest().getRequest().getSubscriptionTimeoutSecs(), setup.getExecuteStageRequest().getRequest().getMinRuntimeSecs()));
    }
    logger.info("Running worker info: " + rw);
    rw.signalStartedInitiated();
    try {
        logger.info(">>>>>>>>>>>>>>>>Calling lifecycle.startup()");
        Lifecycle lifecycle = rw.getJob().getLifecycle();
        lifecycle.startup();
        ServiceLocator serviceLocator = lifecycle.getServiceLocator();
        if (lookupSpectatorRegistry) {
            try {
                final Registry spectatorRegistry = serviceLocator.service(Registry.class);
                SpectatorRegistryFactory.setRegistry(spectatorRegistry);
            } catch (Throwable t) {
                logger.error("failed to init spectator registry using service locator, falling back to {}", SpectatorRegistryFactory.getRegistry().getClass().getCanonicalName());
            }
        }
        // create job context
        Parameters parameters = ParameterUtils.createContextParameters(rw.getJob().getParameterDefinitions(), setup.getParameters());
        final Context context = generateContext(parameters, serviceLocator, workerInfo, MetricsRegistry.getInstance(), () -> {
            rw.signalCompleted();
            // wait for completion signal to go to the master and us getting killed. Upon timeout, exit.
            try {
                Thread.sleep(60000);
            } catch (InterruptedException ie) {
                logger.warn("Unexpected exception sleeping: " + ie.getMessage());
            }
            System.exit(0);
        }, createWorkerMapObservable(selfSchedulingInfo, executionRequest.getJobName(), executionRequest.getJobId(), executionRequest.getDurationType()));
        // context.setPrevStageCompletedObservable(createPrevStageCompletedObservable(selfSchedulingInfo, rw.getJobId(), rw.getStageNum()));
        rw.setContext(context);
        // setup heartbeats
        heartbeatRef.set(new Heartbeat(rw.getJobId(), rw.getStageNum(), rw.getWorkerIndex(), rw.getWorkerNum()));
        final double networkMbps = executionRequest.getSchedulingInfo().forStage(rw.getStageNum()).getMachineDefinition().getNetworkMbps();
        startSendingHeartbeats(rw.getJobStatus(), new WorkerId(executionRequest.getJobId(), executionRequest.getWorkerIndex(), executionRequest.getWorkerNumber()).getId(), networkMbps);
        // execute stage
        if (rw.getStageNum() == 0) {
            logger.info("JobId: " + rw.getJobId() + ", executing Job Master");
            final AutoScaleMetricsConfig autoScaleMetricsConfig = new AutoScaleMetricsConfig();
            // Temporary workaround to enable auto-scaling by custom metric in Job Master. This will be revisited to get the entire autoscaling config
            // for a job as a System parameter in the JobMaster
            final String autoScaleMetricString = (String) parameters.get(JOB_MASTER_AUTOSCALE_METRIC_SYSTEM_PARAM, "");
            if (!Strings.isNullOrEmpty(autoScaleMetricString)) {
                final List<String> tokens = Splitter.on("::").omitEmptyStrings().trimResults().splitToList(autoScaleMetricString);
                if (tokens.size() == 3) {
                    final String metricGroup = tokens.get(0);
                    final String metricName = tokens.get(1);
                    final String algo = tokens.get(2);
                    try {
                        final AutoScaleMetricsConfig.AggregationAlgo aggregationAlgo = AutoScaleMetricsConfig.AggregationAlgo.valueOf(algo);
                        logger.info("registered UserDefined auto scale metric {}:{} algo {}", metricGroup, metricName, aggregationAlgo);
                        autoScaleMetricsConfig.addUserDefinedMetric(metricGroup, metricName, aggregationAlgo);
                    } catch (IllegalArgumentException e) {
                        final String errorMsg = String.format("ERROR: Invalid algorithm value %s for param %s (algo should be one of %s)", autoScaleMetricsConfig, JOB_MASTER_AUTOSCALE_METRIC_SYSTEM_PARAM, Arrays.stream(AutoScaleMetricsConfig.AggregationAlgo.values()).map(a -> a.name()).collect(Collectors.toList()));
                        logger.error(errorMsg);
                        throw new RuntimeException(errorMsg);
                    }
                } else {
                    final String errorMsg = String.format("ERROR: Invalid value %s for param %s", autoScaleMetricString, JOB_MASTER_AUTOSCALE_METRIC_SYSTEM_PARAM);
                    logger.error(errorMsg);
                    throw new RuntimeException(errorMsg);
                }
            } else {
                logger.info("param {} is null or empty", JOB_MASTER_AUTOSCALE_METRIC_SYSTEM_PARAM);
            }
            final JobMasterService jobMasterService = new JobMasterService(rw.getJobId(), rw.getSchedulingInfo(), workerMetricsClient, autoScaleMetricsConfig, mantisMasterApi, rw.getContext(), rw.getOnCompleteCallback(), rw.getOnErrorCallback(), rw.getOnTerminateCallback());
            jobMasterService.start();
            signalStarted(rw, subscriptionStateHandlerRef);
            // block until worker terminates
            rw.waitUntilTerminate();
        } else if (rw.getStageNum() == 1 && rw.getTotalStagesNet() == 1) {
            logger.info("JobId: " + rw.getJobId() + ", single stage job, executing entire job");
            // single stage, execute entire job on this machine
            PortSelector portSelector = new PortSelector() {

                @Override
                public int acquirePort() {
                    return rw.getPorts().next();
                }
            };
            RxMetrics rxMetrics = new RxMetrics();
            StageExecutors.executeSingleStageJob(rw.getJob().getSource(), rw.getStage(), rw.getJob().getSink(), portSelector, rxMetrics, rw.getContext(), rw.getOnTerminateCallback(), rw.getWorkerIndex(), rw.getSourceStageTotalWorkersObservable(), onSinkSubscribe, onSinkUnsubscribe, rw.getOnCompleteCallback(), rw.getOnErrorCallback());
            signalStarted(rw, subscriptionStateHandlerRef);
            // block until worker terminates
            rw.waitUntilTerminate();
        } else {
            logger.info("JobId: " + rw.getJobId() + ", executing a multi-stage job, stage: " + rw.getStageNum());
            if (rw.getStageNum() == 1) {
                // execute source stage
                String remoteObservableName = rw.getJobId() + "_" + rw.getStageNum();
                StageSchedulingInfo currentStageSchedulingInfo = rw.getSchedulingInfo().forStage(1);
                WorkerPublisherRemoteObservable publisher = new WorkerPublisherRemoteObservable<>(rw.getPorts().next(), remoteObservableName, numWorkersAtStage(selfSchedulingInfo, rw.getJobId(), rw.getStageNum() + 1), rw.getJobName());
                StageExecutors.executeSource(rw.getWorkerIndex(), rw.getJob().getSource(), rw.getStage(), publisher, rw.getContext(), rw.getSourceStageTotalWorkersObservable());
                logger.info("JobId: " + rw.getJobId() + " stage: " + rw.getStageNum() + ", serving remote observable for source with name: " + remoteObservableName);
                RemoteRxServer server = publisher.getServer();
                RxMetrics rxMetrics = server.getMetrics();
                MetricsRegistry.getInstance().registerAndGet(rxMetrics.getCountersAndGauges());
                signalStarted(rw, subscriptionStateHandlerRef);
                logger.info("JobId: " + rw.getJobId() + " stage: " + rw.getStageNum() + ", blocking until source observable completes");
                server.blockUntilServerShutdown();
            } else {
                // execute intermediate stage or last stage plus sink
                executeNonSourceStage(selfSchedulingInfo, rw, subscriptionStateHandlerRef);
            }
        }
        logger.info("Calling lifecycle.shutdown()");
        lifecycle.shutdown();
    } catch (Throwable t) {
        rw.signalFailed(t);
        shutdownStage();
    }
}

Example 7 with Context

use of io.mantisrx.runtime.Context in project mantis by Netflix.

the class HttpSourceImplTest method testTimeoutShouldUnsubscribeServer.

@Test
public void testTimeoutShouldUnsubscribeServer() throws Exception {
    HttpClientFactory<ByteBuf, ByteBuf> factory = new HttpClientFactory<ByteBuf, ByteBuf>() {

        @Override
        public HttpClient<ByteBuf, ByteBuf> createClient(ServerInfo server) {
            ClientConfig clientConfig = new ClientConfig.Builder().readTimeout(10, TimeUnit.MILLISECONDS).build();
            return new HttpClientBuilder<ByteBuf, ByteBuf>(server.getHost(), server.getPort()).config(clientConfig).build();
        }
    };
    HttpSourceImpl<ByteBuf, ByteBuf, ServerContext<ByteBuf>> source = HttpSourceImpl.builder(factory, HttpRequestFactories.createGetFactory("test/timeout?timeout=10000"), HttpSourceImpl.<ByteBuf>contextWrapper()).withActivityObserver(sourceObserver).resumeWith(new ClientResumePolicy<ByteBuf, ByteBuf>() {

        @Override
        public Observable<HttpClientResponse<ByteBuf>> onError(ServerClientContext<ByteBuf, ByteBuf> clientContext, int attempts, Throwable error) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public Observable<HttpClientResponse<ByteBuf>> onCompleted(ServerClientContext<ByteBuf, ByteBuf> clientContext, int attempts) {
            // TODO Auto-generated method stub
            return null;
        }
    }).withServerProvider(new HttpServerProvider() {

        @Override
        public Observable<ServerInfo> getServersToAdd() {
            return Observable.from(localServerProvider.getServers()).map(new Func1<Server, ServerInfo>() {

                @Override
                public ServerInfo call(Server server) {
                    return toServerInfo(server);
                }
            });
        }

        @Override
        public Observable<ServerInfo> getServersToRemove() {
            return Observable.empty();
        }
    }).build();
    final CountDownLatch latch = new CountDownLatch(1);
    final AtomicReference<Throwable> ex = new AtomicReference<>();
    final AtomicReference<ServerContext<ByteBuf>> items = new AtomicReference<>();
    Observable.merge(source.call(new Context(), new Index(1, 1))).subscribe(new Subscriber<ServerContext<ByteBuf>>() {

        @Override
        public void onCompleted() {
            latch.countDown();
        }

        @Override
        public void onError(Throwable e) {
            ex.set(e);
            latch.countDown();
        }

        @Override
        public void onNext(ServerContext<ByteBuf> pair) {
            items.set(pair);
        }
    });
    if (!latch.await(5, TimeUnit.SECONDS)) {
        fail("The test case should finish way sooner than 5 seconds. ");
    }
    Assert.assertNull("The timeout error should be captured by the client so it does not surface to the source", ex.get());
    Assert.assertNull("There should be no emitted item due to connection timeout", items.get());
    for (Server server : localServerProvider.getServers()) {
        ServerInfo serverInfo = toServerInfo(server);
        assertEquals("There should be no source level error", 0, sourceObserver.getErrorCount());
        assertEquals("There should be one connection attempt per server", 1, sourceObserver.getCount(serverInfo, EventType.CONNECTION_ATTEMPTED));
        assertEquals("There should be no established connection per server due to read timeout. ", 0, sourceObserver.getCount(serverInfo, EventType.CONNECTION_ESTABLISHED));
        assertEquals("There should no subscribed server because of read timeout", 0, sourceObserver.getCount(serverInfo, EventType.SUBSCRIPTION_ESTABLISHED));
    }
}

Example 8 with Context

use of io.mantisrx.runtime.Context in project mantis by Netflix.

the class HttpSourceImplTest method testResumeOnCompletionButNotOnRemovedServers.

@Test
public void testResumeOnCompletionButNotOnRemovedServers() throws Exception {
    final int maxRepeat = 10;
    final int cutOff = 5;
    final CountDownLatch countGate = new CountDownLatch(localServerProvider.serverSize() * (cutOff - 1));
    final ConcurrentHashMap<ServerInfo, AtomicInteger> resumptionCounts = new ConcurrentHashMap<>();
    final ConcurrentHashMap<ServerInfo, AtomicInteger> counterPerServer = new ConcurrentHashMap<>();
    for (Server server : localServerProvider.getServers()) {
        ServerInfo serverInfo = toServerInfo(server);
        resumptionCounts.put(serverInfo, new AtomicInteger(0));
        counterPerServer.put(serverInfo, new AtomicInteger(0));
    }
    HttpSourceImpl<ByteBuf, ByteBuf, ServerContext<ByteBuf>> source = createSingleEntitySource(new ClientResumePolicy<ByteBuf, ByteBuf>() {

        @Override
        public Observable<HttpClientResponse<ByteBuf>> onError(ServerClientContext<ByteBuf, ByteBuf> clientContext, int attempts, Throwable error) {
            return null;
        }

        @Override
        public Observable<HttpClientResponse<ByteBuf>> onCompleted(ServerClientContext<ByteBuf, ByteBuf> clientContext, int attempts) {
            resumptionCounts.get(clientContext.getServer()).incrementAndGet();
            countGate.countDown();
            if (attempts < maxRepeat) {
                return clientContext.newResponse();
            } else {
                return null;
            }
        }
    });
    final AtomicInteger counter = new AtomicInteger();
    final CountDownLatch done = new CountDownLatch(1);
    Observable.merge(source.call(new Context(), new Index(1, 1))).map(new Func1<ServerContext<ByteBuf>, ServerContext<String>>() {

        @Override
        public ServerContext<String> call(ServerContext<ByteBuf> pair) {
            return new ServerContext<>(pair.getServer(), pair.getValue().toString(Charset.defaultCharset()));
        }
    }).doOnNext(new Action1<ServerContext<String>>() {

        @Override
        public void call(ServerContext<String> context) {
            counter.incrementAndGet();
            assertEquals(RequestProcessor.SINGLE_ENTITY_RESPONSE, context.getValue());
            ServerInfo server = context.getServer();
            counterPerServer.get(server).incrementAndGet();
            if (counterPerServer.get(server).get() > cutOff) {
                localServerProvider.removeServer(server);
            }
        }
    }).doOnError(new Action1<Throwable>() {

        @Override
        public void call(Throwable throwable) {
            fail("Unexpected failure: " + throwable);
        }
    }).doAfterTerminate(new Action0() {

        @Override
        public void call() {
            try {
                countGate.await();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            done.countDown();
        }
    }).subscribe();
    long wait = 5;
    if (!done.await(wait, TimeUnit.SECONDS)) {
        fail(String.format("All streaming should be done within %d seconds. ", wait));
    }
    assertEquals("All server should be resumed", localServerProvider.serverSize(), resumptionCounts.size());
    for (ServerInfo server : resumptionCounts.keySet()) {
        assertTrue(String.format("The server %s:%s should be resumed fewer than %d times", server.getHost(), server.getPort(), maxRepeat), maxRepeat > resumptionCounts.get(server).get());
    }
    assertTrue(String.format("There should be at least %d response from each of the %d servers", cutOff + 1, localServerProvider.serverSize()), (cutOff + 1) * localServerProvider.serverSize() <= counter.get());
    for (Server server : localServerProvider.getServers()) {
        ServerInfo serverInfo = toServerInfo(server);
        assertEquals("There should be no error", 0, sourceObserver.getCount(serverInfo, EventType.SUBSCRIPTION_FAILED));
    }
    assertEquals(String.format("There are %d repeats, but there should be only one final completion", maxRepeat - 1), 1, sourceObserver.getCompletionCount());
    assertEquals("There should be no error", 0, sourceObserver.getErrorCount());
    Set<EventType> events = sourceObserver.getEvents();
    Set<EventType> expectedEvents = new HashSet<>();
    expectedEvents.addAll(Arrays.asList(EventType.SUBSCRIPTION_CANCELED, EventType.SERVER_FOUND, EventType.CONNECTION_ATTEMPTED, EventType.CONNECTION_ESTABLISHED, EventType.SUBSCRIPTION_ESTABLISHED, EventType.SOURCE_COMPLETED, EventType.SUBSCRIPTION_ENDED, EventType.CONNECTION_UNSUBSCRIBED));
    assertEquals(expectedEvents, events);
    assertEquals("Each connection should be unsubscribed once by the subscriber", localServerProvider.serverSize(), sourceObserver.getEventCount(CONNECTION_UNSUBSCRIBED));
    for (EventType eventType : new EventType[] { EventType.SOURCE_COMPLETED, EventType.SUBSCRIPTION_ESTABLISHED, EventType.CONNECTION_ATTEMPTED, EventType.CONNECTION_ESTABLISHED }) {
        assertTrue(String.format("Event %s should be recorded at least %d times per server", eventType, cutOff), (cutOff + 1) * localServerProvider.serverSize() <= sourceObserver.getEventCount(eventType));
    }
    for (EventType eventType : new EventType[] { EventType.SERVER_FOUND, EventType.SUBSCRIPTION_CANCELED }) {
        assertEquals(String.format("Event %s should be recorded exactly once per server", eventType), localServerProvider.serverSize(), sourceObserver.getEventCount(eventType));
    }
}

Example 9 with Context

use of io.mantisrx.runtime.Context in project mantis by Netflix.

the class HttpSourceImplTest method testResumeOnCompletion.

@Test
public void testResumeOnCompletion() throws Exception {
    final int maxRepeat = 10;
    final CountDownLatch countGate = new CountDownLatch(maxRepeat * localServerProvider.serverSize());
    HttpSourceImpl<ByteBuf, ByteBuf, ServerContext<ByteBuf>> source = createSingleEntitySource(new ClientResumePolicy<ByteBuf, ByteBuf>() {

        @Override
        public Observable<HttpClientResponse<ByteBuf>> onError(ServerClientContext<ByteBuf, ByteBuf> clientContext, int attempts, Throwable error) {
            return null;
        }

        @Override
        public Observable<HttpClientResponse<ByteBuf>> onCompleted(ServerClientContext<ByteBuf, ByteBuf> clientContext, int attempts) {
            countGate.countDown();
            if (attempts < maxRepeat) {
                return clientContext.newResponse();
            } else {
                return null;
            }
        }
    });
    final AtomicInteger counter = new AtomicInteger();
    final CountDownLatch done = new CountDownLatch(1);
    Observable.merge(source.call(new Context(), new Index(1, 1))).map(new Func1<ServerContext<ByteBuf>, ServerContext<String>>() {

        @Override
        public ServerContext<String> call(ServerContext<ByteBuf> pair) {
            try {
                return new ServerContext<>(pair.getServer(), pair.getValue().retain().toString(Charset.defaultCharset()));
            } catch (Throwable e) {
                e.printStackTrace();
                throw new RuntimeException(e);
            }
        }
    }).doOnNext(new Action1<ServerContext<String>>() {

        @Override
        public void call(ServerContext<String> pair) {
            counter.incrementAndGet();
            assertEquals(RequestProcessor.SINGLE_ENTITY_RESPONSE, pair.getValue());
        }
    }).doOnError(new Action1<Throwable>() {

        @Override
        public void call(Throwable throwable) {
            fail("Unexpected failure: " + throwable);
        }
    }).doAfterTerminate(new Action0() {

        @Override
        public void call() {
            try {
                countGate.await();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            done.countDown();
        }
    }).subscribe();
    long wait = 5;
    if (!done.await(5, TimeUnit.SECONDS)) {
        fail(String.format("All streaming should be done within %d seconds. ", wait));
    }
    assertEquals(String.format("There should be exactly %d response from each of the %d servers", maxRepeat, localServerProvider.serverSize()), maxRepeat * localServerProvider.serverSize(), counter.get());
    for (Server server : localServerProvider.getServers()) {
        ServerInfo serverInfo = toServerInfo(server);
        assertEquals(String.format("There should be %d completion per server as resumption function should called %d times", maxRepeat, maxRepeat - 1), maxRepeat, sourceObserver.getCount(serverInfo, EventType.SOURCE_COMPLETED));
        assertEquals("There should be no error", 0, sourceObserver.getCount(serverInfo, EventType.SUBSCRIPTION_FAILED));
        assertEquals(String.format("Connection per server should have been established %d times", maxRepeat), 10, sourceObserver.getCount(serverInfo, EventType.SUBSCRIPTION_ESTABLISHED));
    }
    assertEquals(String.format("There are %d repeats, but there should be only one final completion", maxRepeat - 1), 1, sourceObserver.getCompletionCount());
    assertEquals(0, sourceObserver.getErrorCount());
    Set<EventType> events = sourceObserver.getEvents();
    assertEquals(EXPECTED_EVENTS_SETS, events);
    assertEquals("Each connection should be unsubscribed once by the subscriber", localServerProvider.serverSize(), sourceObserver.getEventCount(CONNECTION_UNSUBSCRIBED));
    for (EventType eventType : new EventType[] { EventType.SOURCE_COMPLETED, EventType.SUBSCRIPTION_ESTABLISHED, EventType.CONNECTION_ATTEMPTED, EventType.CONNECTION_ESTABLISHED }) {
        assertEquals(String.format("Event %s should be recorded exactly %d times per server", eventType, maxRepeat), maxRepeat * localServerProvider.serverSize(), sourceObserver.getEventCount(eventType));
    }
    assertEquals("Event SERVER_FOUND should be recorded exactly once per server", localServerProvider.serverSize(), sourceObserver.getEventCount(EventType.SERVER_FOUND));
}

Example 10 with Context

use of io.mantisrx.runtime.Context in project mantis by Netflix.

the class HttpSourceTest method sourceEchoStreamFromPost.

private void sourceEchoStreamFromPost(HttpSource<ServerSentEvent, ServerSentEvent> source, String postContent) throws Exception {
    final AtomicInteger counter = new AtomicInteger();
    final CountDownLatch done = new CountDownLatch(1);
    final ConcurrentHashMap<String, AtomicInteger> result = new ConcurrentHashMap<>();
    Observable.merge(source.call(new Context(), new Index(1, 1))).doOnNext(new Action1<ServerSentEvent>() {

        @Override
        public void call(ServerSentEvent event) {
            counter.incrementAndGet();
            String msg = event.contentAsString();
            result.putIfAbsent(msg, new AtomicInteger());
            result.get(msg).incrementAndGet();
        }
    }).doOnError(new Action1<Throwable>() {

        @Override
        public void call(Throwable throwable) {
            fail("Unexpected failure: " + throwable);
        }
    }).doAfterTerminate(new Action0() {

        @Override
        public void call() {
            done.countDown();
        }
    }).subscribe();
    long waitSeconds = 30000;
    boolean timedout = !done.await(waitSeconds, TimeUnit.SECONDS);
    if (timedout) {
        fail(String.format("Waited at least %d seconds for the test to finish. Something is wrong", waitSeconds));
    }
    Assert.assertEquals(String.format("%d servers => the result has %d times of a single echo", localServerProvider.serverSize(), localServerProvider.serverSize()), localServerProvider.serverSize(), counter.get());
    assertEquals(String.format("%d servers => %d identical copies per message", localServerProvider.serverSize(), localServerProvider.serverSize()), localServerProvider.serverSize(), result.get(postContent).get());
    for (ServerInfo server : localServerProvider.getServerInfos()) {
        assertEquals("There should be one completion per server", 1, sourceObserver.getCount(server, EventType.SOURCE_COMPLETED));
        assertEquals("There should be one un-subscription per server", 1, sourceObserver.getCount(server, EventType.CONNECTION_UNSUBSCRIBED));
        assertEquals("There should be no error", 0, sourceObserver.getCount(server, EventType.SUBSCRIPTION_FAILED));
        assertEquals("There should be one connection per server", 1, sourceObserver.getCount(server, EventType.CONNECTION_ESTABLISHED));
    }
    assertEquals(1, sourceObserver.getCompletionCount());
    assertEquals(0, sourceObserver.getErrorCount());
    Set<EventType> events = sourceObserver.getEvents();
    assertEquals(EXPECTED_EVENTS_SETS, events);
    for (EventType event : events) {
        assertEquals("Each event should be recorded exactly once per server", localServerProvider.serverSize(), sourceObserver.getEventCount(event));
    }
}