Java tutorial
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However, if you add GPL Version 2 code * and therefore, elected the GPL Version 2 license, then the option applies * only if the new code is made subject to such option by the copyright * holder. */ package org.glassfish.jersey.examples.sseitemstore.jaxrs; import java.net.URI; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.List; import java.util.Queue; import java.util.concurrent.ConcurrentLinkedQueue; import java.util.concurrent.CountDownLatch; import java.util.concurrent.TimeUnit; import java.util.concurrent.atomic.AtomicInteger; import java.util.logging.Level; import java.util.logging.Logger; import javax.ws.rs.client.Entity; import javax.ws.rs.client.WebTarget; import javax.ws.rs.core.Application; import javax.ws.rs.core.Form; import javax.ws.rs.core.Response; import javax.ws.rs.core.UriBuilder; import javax.ws.rs.sse.SseEventSource; import org.glassfish.jersey.apache.connector.ApacheClientProperties; import org.glassfish.jersey.apache.connector.ApacheConnectorProvider; import org.glassfish.jersey.client.ClientConfig; import org.glassfish.jersey.client.ClientProperties; import org.glassfish.jersey.test.JerseyTest; import org.glassfish.jersey.test.external.ExternalTestContainerFactory; import org.apache.http.impl.conn.PoolingHttpClientConnectionManager; import org.junit.Test; import static org.hamcrest.CoreMatchers.containsString; import static org.hamcrest.CoreMatchers.describedAs; import static org.hamcrest.CoreMatchers.equalTo; import static org.hamcrest.CoreMatchers.hasItems; import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertThat; import static org.junit.Assert.assertTrue; /** * Item store test. * * @author Marek Potociar (marek.potociar at oracle.com) */ public class JaxrsItemStoreResourceTest extends JerseyTest { private static final int RECONNECT_DEFAULT = 500; private static final Logger LOGGER = Logger.getLogger(JaxrsItemStoreResourceTest.class.getName()); private static final int MAX_LISTENERS = 5; private static final int MAX_ITEMS = 10; @Override protected Application configure() { return new JaxrsItemStoreApp(); } @Override protected void configureClient(ClientConfig config) { // using AHC as a test client connector to avoid issues with HttpUrlConnection socket management. PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(); // adjusting max. connections just to be safe - the testEventSourceReconnect is quite greedy... cm.setMaxTotal(MAX_LISTENERS * MAX_ITEMS); cm.setDefaultMaxPerRoute(MAX_LISTENERS * MAX_ITEMS); config.property(ApacheClientProperties.CONNECTION_MANAGER, cm).property(ClientProperties.READ_TIMEOUT, 2000) .connectorProvider(new ApacheConnectorProvider()); } @Override protected URI getBaseUri() { final UriBuilder baseUriBuilder = UriBuilder.fromUri(super.getBaseUri()) .path("sse-item-store-jaxrs-webapp"); final boolean externalFactoryInUse = getTestContainerFactory() instanceof ExternalTestContainerFactory; return externalFactoryInUse ? baseUriBuilder.path("resources").build() : baseUriBuilder.build(); } /** * Test the item addition, addition event broadcasting and item retrieval from {@link JaxrsItemStoreResource}. * * @throws Exception in case of a test failure. */ @Test public void testItemsStore() throws Exception { final List<String> items = Collections.unmodifiableList(Arrays.asList("foo", "bar", "baz")); final WebTarget itemsTarget = target("items"); final CountDownLatch latch = new CountDownLatch(items.size() * MAX_LISTENERS * 2); // countdown on all events final List<Queue<Integer>> indexQueues = new ArrayList<>(MAX_LISTENERS); final SseEventSource[] sources = new SseEventSource[MAX_LISTENERS]; final AtomicInteger sizeEventsCount = new AtomicInteger(0); for (int i = 0; i < MAX_LISTENERS; i++) { final int id = i; final SseEventSource es = SseEventSource.target(itemsTarget.path("events")).build(); sources[id] = es; final Queue<Integer> indexes = new ConcurrentLinkedQueue<>(); indexQueues.add(indexes); es.register(inboundEvent -> { try { if (null == inboundEvent.getName()) { final String data = inboundEvent.readData(); LOGGER.info("[-i-] SOURCE " + id + ": Received event id=" + inboundEvent.getId() + " data=" + data); indexes.add(items.indexOf(data)); } else if ("size".equals(inboundEvent.getName())) { sizeEventsCount.incrementAndGet(); } } catch (Exception ex) { LOGGER.log(Level.SEVERE, "[-x-] SOURCE " + id + ": Error getting event data.", ex); indexes.add(-999); } finally { latch.countDown(); } }); } try { open(sources); items.forEach((item) -> postItem(itemsTarget, item)); assertTrue("Waiting to receive all events has timed out.", latch.await((1000 + MAX_LISTENERS * RECONNECT_DEFAULT) * getAsyncTimeoutMultiplier(), TimeUnit.MILLISECONDS)); // need to force disconnect on server in order for EventSource.close(...) to succeed with HttpUrlConnection sendCommand(itemsTarget, "disconnect"); } finally { close(sources); } String postedItems = itemsTarget.request().get(String.class); items.forEach( (item) -> assertTrue("Item '" + item + "' not stored on server.", postedItems.contains(item))); final AtomicInteger queueId = new AtomicInteger(0); indexQueues.forEach((indexes) -> { for (int i = 0; i < items.size(); i++) { assertTrue("Event for '" + items.get(i) + "' not received in queue " + queueId.get(), indexes.contains(i)); } assertEquals("Not received the expected number of events in queue " + queueId.get(), items.size(), indexes.size()); queueId.incrementAndGet(); }); assertEquals("Number of received 'size' events does not match.", items.size() * MAX_LISTENERS, sizeEventsCount.get()); } /** * Test the {@link SseEventSource} reconnect feature. * * @throws Exception in case of a test failure. */ @Test public void testEventSourceReconnect() throws Exception { final WebTarget itemsTarget = target("items"); final CountDownLatch latch = new CountDownLatch(MAX_ITEMS * MAX_LISTENERS * 2); // countdown only on new item events final List<Queue<String>> receivedQueues = new ArrayList<>(MAX_LISTENERS); final SseEventSource[] sources = new SseEventSource[MAX_LISTENERS]; for (int i = 0; i < MAX_LISTENERS; i++) { final int id = i; final SseEventSource es = SseEventSource.target(itemsTarget.path("events")) .reconnectingEvery(1, TimeUnit.MILLISECONDS).build(); sources[id] = es; final Queue<String> received = new ConcurrentLinkedQueue<>(); receivedQueues.add(received); es.register(inboundEvent -> { try { if (null == inboundEvent.getName()) { final String data = inboundEvent.readData(); LOGGER.info("[-i-] SOURCE " + id + ": Received event id=" + inboundEvent.getId() + " data=" + data); received.add(data); latch.countDown(); } } catch (Exception ex) { LOGGER.log(Level.SEVERE, "[-x-] SOURCE " + id + ": Error getting event data.", ex); received.add("[data processing error]"); } }); } final String[] postedItems = new String[MAX_ITEMS * 2]; try { open(sources); for (int i = 0; i < MAX_ITEMS; i++) { final String item = String.format("round-1-%02d", i); postItem(itemsTarget, item); postedItems[i] = item; sendCommand(itemsTarget, "disconnect"); Thread.sleep(200); } final int reconnectDelay = 1; sendCommand(itemsTarget, "reconnect " + reconnectDelay); sendCommand(itemsTarget, "disconnect"); Thread.sleep(reconnectDelay * 1000); for (int i = 0; i < MAX_ITEMS; i++) { final String item = String.format("round-2-%02d", i); postedItems[i + MAX_ITEMS] = item; postItem(itemsTarget, item); } sendCommand(itemsTarget, "reconnect now"); assertTrue("Waiting to receive all events has timed out.", latch.await( (1 + MAX_LISTENERS * (MAX_ITEMS + 1) * reconnectDelay) * getAsyncTimeoutMultiplier(), TimeUnit.SECONDS)); // need to force disconnect on server in order for EventSource.close(...) to succeed with HttpUrlConnection sendCommand(itemsTarget, "disconnect"); } finally { close(sources); } final String storedItems = itemsTarget.request().get(String.class); for (String item : postedItems) { assertThat("Posted item '" + item + "' stored on server", storedItems, containsString(item)); } int sourceId = 0; for (Queue<String> queue : receivedQueues) { assertThat("Received events in source " + sourceId, queue, describedAs("Collection containing %0", hasItems(postedItems), Arrays.asList(postedItems).toString())); assertThat("Size of received queue for source " + sourceId, queue.size(), equalTo(postedItems.length)); sourceId++; } } private static void postItem(final WebTarget itemsTarget, final String item) { final Response response = itemsTarget.request().post(Entity.form(new Form("name", item))); assertEquals("Posting new item has failed.", 204, response.getStatus()); LOGGER.info("[-i-] POSTed item: '" + item + "'"); } private static void open(final SseEventSource[] sources) { Arrays.stream(sources).forEach(SseEventSource::open); } private static void close(final SseEventSource[] sources) { int i = 0; for (SseEventSource source : sources) { if (source.isOpen()) { assertTrue("Waiting to close a source has timed out.", source.close(1, TimeUnit.SECONDS)); // source.close(100, TimeUnit.MILLISECONDS); LOGGER.info("[<--] SOURCE " + i++ + " closed."); } } } private static void sendCommand(final WebTarget itemsTarget, final String command) { final Response response = itemsTarget.path("commands").request().post(Entity.text(command)); assertEquals("'" + command + "' command has failed.", 200, response.getStatus()); LOGGER.info("[-!-] COMMAND '" + command + "' has been processed."); } }