ThreadpoolSizeTest.java

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package com.sun.jersey.impl.client;

import com.sun.jersey.api.client.AsyncWebResource;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.config.ClientConfig;
import com.sun.jersey.api.client.config.DefaultClientConfig;
import com.sun.jersey.impl.container.grizzly.AbstractGrizzlyServerTester;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

/**
 *
 * @author pavel.bucek@oracle.com
 */
public class ThreadpoolSizeTest extends AbstractGrizzlyServerTester {
    @Path("/test")
    public static class HttpMethodResource {
        @GET
        public String get() {
            sleep();
            return "GET";
        }
               
        private void sleep() {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException ex) {
            }
        }
    }

    public ThreadpoolSizeTest(String testName) {
        super(testName);
    }
    
    public void testGet() throws Exception {
        startServer(HttpMethodResource.class);
        ClientConfig cc = new DefaultClientConfig();
        cc.getProperties().put(ClientConfig.PROPERTY_THREADPOOL_SIZE, 10);
        Client c = Client.create(cc);
        AsyncWebResource r = c.asyncResource(getUri().path("test").build());

        int threadCount = Thread.activeCount();

        List<Future<ClientResponse>> list = new ArrayList<Future<ClientResponse>>(100);

        for(int i = 0; i < 100; i++)
            list.add(r.get(ClientResponse.class));

        for(int i = 0; i < 100; i++) {
            ClientResponse cr = list.get(i).get();
            assertEquals("GET", cr.getEntity(String.class));
            assertTrue((Thread.activeCount() - threadCount) < 20);
        }

        terminate(c.getExecutorService());
    }

    private void terminate(ExecutorService es) throws Exception {
        es.shutdown();
        assertTrue(es.awaitTermination(100, TimeUnit.MILLISECONDS));
        assertTrue(es.isTerminated());
    }
}