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package org.glassfish.jersey.tests.integration.jersey2812;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import java.util.logging.Logger;
import javax.ws.rs.container.AsyncResponse;
import javax.ws.rs.core.Response;
import javax.servlet.FilterChain;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.glassfish.jersey.internal.guava.ThreadFactoryBuilder;
import org.glassfish.jersey.tests.integration.async.AbstractAsyncJerseyTest;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
/**
* JERSEY-2812 reproducer.
* <p/>
* This test must not run in parallel.
*
* @author Stepan Vavra (stepan.vavra at oracle.com)
*/
public class Jersey2812ITCase extends AbstractAsyncJerseyTest {
private static final Logger LOGGER = Logger.getLogger(Jersey2812ITCase.class.getName());
private static long WAIT_TIMEOUT = 5000;
private AtomicReference<String> asyncResult = new AtomicReference<>();
private String uuid = UUID.randomUUID().toString();
private ExecutorService executorService = Executors
.newSingleThreadExecutor(new ThreadFactoryBuilder().setDaemon(true).build());
@Before
public void triggerTheWaitRequestInSeparateThread() throws Exception {
executorService.execute(new Runnable() {
@Override
public void run() {
LOGGER.finer("Running a request to /async/wait in a separate thread.");
asyncResult.set(target("/asyncTest/async/wait").path(uuid).request().get(String.class));
}
});
}
/**
* Tests whether the server-side thread that is processing a http request to the servlet-filter-based Jersey setup ends up
* stuck or returned back to the pool of available threads.
* <p/>
* This test prevents a regression reported in JERSEY-2812.
* <p/>
* When the {@link javax.ws.rs.container.AsyncResponse} was left intact in the RESTful resource (as implemented in {@link
* TestWaitResource#waitForEvent(AsyncResponse, HttpServletRequest, String)}), the server-side Jersey thread ended up in
* {@link org.glassfish.jersey.servlet.internal.ResponseWriter#getResponseContext()} blocked because of the resolution of http
* response status from {@link org.glassfish.jersey.servlet.ServletContainer#doFilter(HttpServletRequest, HttpServletResponse,
* FilterChain, String, String, String)}
* <p/>
* This test uses a separate thread to call {@code /async/wait/{uuid}} resource which blocks until the {@code
* /async/release/{uuid}} is called. In the meantime the JUnit thread calls {@code /async/await/{uuid}} to discover whether
* the server-side thread processing the request to {@code /async/await/{uuid}/started} did start processing of the request.
* Consecutively, the JUnit thread calls {@code /async/await/{uuid}/finished} with a timeout {@code #WAIT_TIMEOUT} to discover
* whether the server-side thread got stuck (which is what JERSEY-2812 reported) or not.
*
* @throws Exception
*/
@Test
public void asyncSuspendedResourceDoesNotGetStuck() throws Exception {
// [1] wait for the /async/wait request to be processed
final Response startResponse = target("/asyncTest/async/await").path(uuid).path("started")
.queryParam("millis", WAIT_TIMEOUT).request().get();
assertTrue("The server-side thread handling the request to /async/wait didn't start in timely fashion. "
+ "This error indicates this test is not executed / designed properly rather than a regression in "
+ "JERSEY-2812 fix.",
startResponse.readEntity(Boolean.class));
// [2] wait for the /async/wait request to finish
final Response finishResponse = target("/asyncTest/async/await").path(uuid).path("finished")
.queryParam("millis", WAIT_TIMEOUT).request().get();
assertTrue("The thread processing the /async/wait request did not respond in timely fashion. "
+ "Memory leak / thread got stuck detected!",
finishResponse.readEntity(Boolean.class));
// [3] release the blocked http call to /async/wait
final String releaseResponse = target("/asyncTest/async/release").path(uuid).request().post(null, String.class);
assertEquals("RELEASED", releaseResponse);
// [4] test whether everything ended as expected
executorService.shutdown();
assertTrue("The test thread did not finish in timely fashion!",
executorService.awaitTermination(WAIT_TIMEOUT, TimeUnit.MILLISECONDS));
assertEquals("async-OK-" + uuid, asyncResult.get());
}
@After
public void releaseResources() {
// release the server-side thread regardless of whether left un-attended
target("/asyncTest/async/release").path(uuid).request().post(null);
}
@After
public void terminateThread() {
// forcibly terminate the test client thread
executorService.shutdownNow();
}
}