/*
* 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.tomcat.websocket;
import java.io.IOException;
import java.net.URI;
import java.util.concurrent.atomic.AtomicInteger;
import javax.websocket.ClientEndpointConfig.Builder;
import javax.websocket.ContainerProvider;
import javax.websocket.DeploymentException;
import javax.websocket.WebSocketContainer;
import org.junit.Test;
import org.apache.catalina.Context;
import org.apache.catalina.servlets.DefaultServlet;
import org.apache.catalina.startup.Tomcat;
import org.apache.catalina.startup.TomcatBaseTest;
import org.apache.tomcat.util.descriptor.web.ApplicationListener;
import org.apache.tomcat.websocket.TesterMessageCountClient.TesterProgrammaticEndpoint;
public class TesterConnectionLimit extends TomcatBaseTest{
/**
* Simple test to see how many outgoing connections can be created on a
* single machine.
*/
@Test
public void testSingleMachine() throws Exception {
Tomcat tomcat = getTomcatInstance();
// Must have a real docBase - just use temp
Context ctx =
tomcat.addContext("", System.getProperty("java.io.tmpdir"));
ctx.addApplicationListener(new ApplicationListener(
TesterEchoServer.Config.class.getName(), false));
Tomcat.addServlet(ctx, "default", new DefaultServlet());
ctx.addServletMapping("/", "default");
tomcat.getConnector().setAttribute("maxConnections", "-1");
tomcat.start();
URI uri = new URI("ws://localhost:" + getPort() +
TesterEchoServer.Config.PATH_ASYNC);
AtomicInteger counter = new AtomicInteger(0);
int threadCount = 50;
Thread[] threads = new ConnectionThread[threadCount];
for (int i = 0; i < threadCount; i++) {
threads[i] = new ConnectionThread(counter, uri);
threads[i].start();
}
// Wait for the threads to die
for (Thread thread : threads) {
thread.join();
}
System.out.println("Maximum connection count was " + counter.get());
}
private static class ConnectionThread extends Thread {
private final AtomicInteger counter;
private final URI uri;
private ConnectionThread(AtomicInteger counter, URI uri) {
this.counter = counter;
this.uri = uri;
}
@Override
public void run() {
WebSocketContainer wsContainer =
ContainerProvider.getWebSocketContainer();
int count = 0;
try {
while (true) {
wsContainer.connectToServer(TesterProgrammaticEndpoint.class,
Builder.create().build(), uri);
count = counter.incrementAndGet();
if (count % 100 == 0) {
System.out.println(count + " and counting...");
}
}
} catch (IOException | DeploymentException ioe) {
// Let thread die
}
}
}
}