Examples of org.apache.http.impl.conn.PoolingHttpClientConnectionManager

org.apache.http.impl.conn.PoolingHttpClientConnectionManager
ClientConnectionPoolManager maintains a pool of {@link HttpClientConnection}s and is able to service connection requests from multiple execution threads. Connections are pooled on a per route basis. A request for a route which already the manager has persistent connections for available in the pool will be services by leasing a connection from the pool rather than creating a brand new connection.
ClientConnectionPoolManager maintains a maximum limit of connection on a per route basis and in total. Per default this implementation will create no more than than 2 concurrent connections per given route and no more 20 connections in total. For many real-world applications these limits may prove too constraining, especially if they use HTTP as a transport protocol for their services. Connection limits, however, can be adjusted using {@link ConnPoolControl} methods. @since 4.3

     */
    @Test
    public void testAbortBeforeExecute() throws Exception {
        this.localServer.register("*", new BasicService());


        final PoolingHttpClientConnectionManager conMan = new PoolingHttpClientConnectionManager();
        final AtomicReference<Throwable> throwableRef = new AtomicReference<Throwable>();
        final CountDownLatch getLatch = new CountDownLatch(1);
        final CountDownLatch startLatch = new CountDownLatch(1);
        final CloseableHttpClient client = HttpClients.custom().setConnectionManager(conMan).build();
        final HttpContext context = new BasicHttpContext();

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        final int port = this.localServer.getServiceAddress().getPort();
        this.localServer.register("*", new SimpleService());


        final HttpHost target = new HttpHost("localhost", port);


        final PoolingHttpClientConnectionManager mgr = new PoolingHttpClientConnectionManager();
        mgr.setMaxTotal(workerCount);
        mgr.setDefaultMaxPerRoute(workerCount);


        final UserTokenHandler userTokenHandler = new UserTokenHandler() {


            public Object getUserToken(final HttpContext context) {
                final String id = (String) context.getAttribute("user");

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        final int port = this.localServer.getServiceAddress().getPort();
        this.localServer.register("*", new SimpleService());


        // We build a client with 2 max active // connections, and 2 max per route.
        final PoolingHttpClientConnectionManager connMngr = new PoolingHttpClientConnectionManager();
        connMngr.setMaxTotal(maxConn);
        connMngr.setDefaultMaxPerRoute(maxConn);


        final UserTokenHandler userTokenHandler = new UserTokenHandler() {


            public Object getUserToken(final HttpContext context) {
                return context.getAttribute("user");

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        this.localServer.register("/random/*", new RandomHandler());
        this.localServer.start();


        final InetSocketAddress saddress = this.localServer.getServiceAddress();


        final PoolingHttpClientConnectionManager mgr = new PoolingHttpClientConnectionManager();
        mgr.setMaxTotal(5);
        mgr.setDefaultMaxPerRoute(5);


        final HttpClient client = HttpClients.custom().setConnectionManager(mgr).build();
        final HttpHost target = new HttpHost(saddress.getHostName(), saddress.getPort(), "http");


        final WorkerThread[] workers = new WorkerThread[10];
        for (int i = 0; i < workers.length; i++) {
            workers[i] = new WorkerThread(
                    client,
                    target,
                    new URI("/random/2000"),
                    10, false);
        }


        for (final WorkerThread worker : workers) {
            worker.start();
        }
        for (final WorkerThread worker : workers) {
            worker.join(10000);
            final Exception ex = worker.getException();
            if (ex != null) {
                throw ex;
            }
        }


        // Expect some connection in the pool
        Assert.assertTrue(mgr.getTotalStats().getAvailable() > 0);


        mgr.shutdown();
    }

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        this.localServer.register("/random/*", new RandomHandler());
        this.localServer.start();


        final InetSocketAddress saddress = this.localServer.getServiceAddress();


        final PoolingHttpClientConnectionManager mgr = new PoolingHttpClientConnectionManager();
        mgr.setMaxTotal(5);
        mgr.setDefaultMaxPerRoute(5);


        final HttpClient client = HttpClients.custom().setConnectionManager(mgr).build();


        final HttpHost target = new HttpHost(saddress.getHostName(), saddress.getPort(), "http");


        final WorkerThread[] workers = new WorkerThread[10];
        for (int i = 0; i < workers.length; i++) {
            workers[i] = new WorkerThread(
                    client,
                    target,
                    new URI("/random/2000"),
                    10, false);
        }


        for (final WorkerThread worker : workers) {
            worker.start();
        }
        for (final WorkerThread worker : workers) {
            worker.join(10000);
            final Exception ex = worker.getException();
            if (ex != null) {
                throw ex;
            }
        }


        // Expect zero connections in the pool
        Assert.assertEquals(0, mgr.getTotalStats().getAvailable());


        mgr.shutdown();
    }

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        this.localServer.register("/random/*", new RandomHandler());
        this.localServer.start();


        final InetSocketAddress saddress = this.localServer.getServiceAddress();


        final PoolingHttpClientConnectionManager mgr = new PoolingHttpClientConnectionManager();
        mgr.setMaxTotal(5);
        mgr.setDefaultMaxPerRoute(5);


        final HttpClient client = HttpClients.custom().setConnectionManager(mgr).build();


        final HttpHost target = new HttpHost(saddress.getHostName(), saddress.getPort(), "http");


        final WorkerThread[] workers = new WorkerThread[10];
        for (int i = 0; i < workers.length; i++) {
            workers[i] = new WorkerThread(
                    client,
                    target,
                    new URI("/random/2000"),
                    10, true);
        }


        for (final WorkerThread worker : workers) {
            worker.start();
        }
        for (final WorkerThread worker : workers) {
            worker.join(10000);
            final Exception ex = worker.getException();
            if (ex != null) {
                throw ex;
            }
        }


        // Expect zero connections in the pool
        Assert.assertEquals(0, mgr.getTotalStats().getAvailable());


        mgr.shutdown();
    }

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        this.localServer.register("/random/*", new RandomHandler());
        this.localServer.start();


        final InetSocketAddress saddress = this.localServer.getServiceAddress();


        final PoolingHttpClientConnectionManager mgr = new PoolingHttpClientConnectionManager();
        mgr.setMaxTotal(1);
        mgr.setDefaultMaxPerRoute(1);


        final HttpClient client = HttpClients.custom().setConnectionManager(mgr).build();


        final HttpHost target = new HttpHost(saddress.getHostName(), saddress.getPort(), "http");


        HttpResponse response = client.execute(target, new HttpGet("/random/2000"));
        EntityUtils.consume(response.getEntity());


        Assert.assertEquals(1, mgr.getTotalStats().getAvailable());
        Assert.assertEquals(1, localServer.getAcceptedConnectionCount());


        response = client.execute(target, new HttpGet("/random/2000"));
        EntityUtils.consume(response.getEntity());


        Assert.assertEquals(1, mgr.getTotalStats().getAvailable());
        Assert.assertEquals(1, localServer.getAcceptedConnectionCount());


        // Now sleep for 1.1 seconds and let the timeout do its work
        Thread.sleep(1100);
        response = client.execute(target, new HttpGet("/random/2000"));
        EntityUtils.consume(response.getEntity());


        Assert.assertEquals(1, mgr.getTotalStats().getAvailable());
        Assert.assertEquals(2, localServer.getAcceptedConnectionCount());


        // Do another request just under the 1 second limit & make
        // sure we reuse that connection.
        Thread.sleep(500);
        response = client.execute(target, new HttpGet("/random/2000"));
        EntityUtils.consume(response.getEntity());


        Assert.assertEquals(1, mgr.getTotalStats().getAvailable());
        Assert.assertEquals(2, localServer.getAcceptedConnectionCount());




        mgr.shutdown();
    }

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         * Create a load of workers which will access the resource. Half will use the default
         * gzip behaviour; half will require identity entity.
         */
        final int clients = 100;


        final PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
        cm.setMaxTotal(clients);


        this.httpclient = HttpClients.custom().setConnectionManager(cm).build();


        final ExecutorService executor = Executors.newFixedThreadPool(clients);

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    }


    @Test
    @Ignore("We have a concurrency bug in HttpCore which will be addressed after HttpClient 4.3.2 is released")
    public void testIdleConnectionEviction() throws Exception {
        final PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
        cm.setDefaultMaxPerRoute(10);
        cm.setMaxTotal(50);


        final HttpClient httpclient = HttpClients.custom().setConnectionManager(cm).build();


        final IdleConnectionMonitor idleConnectionMonitor = new IdleConnectionMonitor(cm);
        idleConnectionMonitor.start();

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    private PoolingHttpClientConnectionManager mgr;


    @Before
    public void setUp() throws Exception {
        startServer();
        this.mgr = new PoolingHttpClientConnectionManager();
        this.httpclient = HttpClients.custom().setConnectionManager(this.mgr).build();
    }

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