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package com.vaadin.ui;
import java.util.Properties;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import javax.servlet.ServletConfig;
import org.junit.Assert;
import org.junit.Test;
import com.vaadin.server.DefaultDeploymentConfiguration;
import com.vaadin.server.MockServletConfig;
import com.vaadin.server.MockVaadinSession;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.server.VaadinServletService;
import com.vaadin.server.VaadinSession;
import com.vaadin.server.communication.PushConnection;
import com.vaadin.shared.communication.PushMode;
public class UITest {
@Test
public void removeFromSessionWithExternalLock() throws Exception {
// See https://dev.vaadin.com/ticket/18436
final UI ui = new UI() {
@Override
protected void init(VaadinRequest request) {
}
};
final Lock externalLock = new ReentrantLock();
ServletConfig servletConfig = new MockServletConfig();
VaadinServlet servlet = new VaadinServlet();
servlet.init(servletConfig);
DefaultDeploymentConfiguration deploymentConfiguration = new DefaultDeploymentConfiguration(
UI.class, new Properties());
MockVaadinSession session = new MockVaadinSession(
new VaadinServletService(servlet, deploymentConfiguration));
session.lock();
ui.setSession(session);
ui.getPushConfiguration().setPushMode(PushMode.MANUAL);
ui.setPushConnection(new PushConnection() {
private boolean connected = true;
@Override
public void push() {
}
@Override
public boolean isConnected() {
return connected;
}
@Override
public void disconnect() {
externalLock.lock();
try {
connected = false;
} finally {
externalLock.unlock();
}
}
});
session.unlock();
final CountDownLatch websocketReachedCheckpoint = new CountDownLatch(1);
final CountDownLatch uiDisconnectReachedCheckpoint = new CountDownLatch(
1);
final VaadinSession uiSession = ui.getSession();
final ConcurrentLinkedQueue<Exception> exceptions = new ConcurrentLinkedQueue<Exception>();
// Simulates the websocket close thread
Runnable websocketClose = new Runnable() {
@Override
public void run() {
externalLock.lock();
// Wait for disconnect thread to lock VaadinSession
websocketReachedCheckpoint.countDown();
try {
uiDisconnectReachedCheckpoint.await();
} catch (InterruptedException e) {
e.printStackTrace();
exceptions.add(e);
return;
}
uiSession.lock();
externalLock.unlock();
}
};
Runnable disconnectPushFromUI = new Runnable() {
@Override
public void run() {
uiSession.lock();
// Wait for websocket thread to lock external lock
uiDisconnectReachedCheckpoint.countDown();
try {
websocketReachedCheckpoint.await();
} catch (InterruptedException e) {
e.printStackTrace();
exceptions.add(e);
return;
}
ui.setSession(null);
uiSession.unlock();
}
};
Thread websocketThread = new Thread(websocketClose);
websocketThread.start();
Thread uiDisconnectThread = new Thread(disconnectPushFromUI);
uiDisconnectThread.start();
websocketThread.join(5000);
uiDisconnectThread.join(5000);
if (websocketThread.isAlive() || uiDisconnectThread.isAlive()) {
websocketThread.interrupt();
uiDisconnectThread.interrupt();
Assert.fail("Threads are still running");
}
if (!exceptions.isEmpty()) {
for (Exception e : exceptions) {
e.printStackTrace();
}
Assert.fail("There were exceptions in the threads");
}
Assert.assertNull(ui.getSession());
// PushConnection is set to null in another thread. We need to wait for
// that to happen
for (int i = 0; i < 10; i++) {
if (ui.getPushConnection() == null) {
break;
}
Thread.sleep(500);
}
Assert.assertNull(ui.getPushConnection());
}
}
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