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Java example source code file (TestConnectionReuse.java)

This example source code file (TestConnectionReuse.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

basichttpprocessor, defaulthttpclient, exception, httpget, httphost, httpparams, inetsocketaddress, io, localtestserver, net, network, randomhandler, schemeregistry, socketfactory, threadsafeclientconnmanager, uri, workerthread

The TestConnectionReuse.java example source code

/*
 * ====================================================================
 * 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.conn;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.URI;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpException;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.HttpResponseInterceptor;
import org.apache.http.HttpVersion;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.params.ConnManagerParams;
import org.apache.http.conn.params.ConnPerRouteBean;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.scheme.SocketFactory;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.localserver.LocalTestServer;
import org.apache.http.localserver.RandomHandler;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.BasicHttpProcessor;
import org.apache.http.protocol.HTTP;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.ResponseConnControl;
import org.apache.http.protocol.ResponseContent;
import org.apache.http.protocol.ResponseDate;
import org.apache.http.protocol.ResponseServer;

public class TestConnectionReuse extends TestCase {

    public TestConnectionReuse(String testName) {
        super(testName);
    }

    public static void main(String args[]) {
        String[] testCaseName = { TestConnectionReuse.class.getName() };
        junit.textui.TestRunner.main(testCaseName);
    }

    public static Test suite() {
        return new TestSuite(TestConnectionReuse.class);
    }

    protected LocalTestServer localServer;
    
    @Override
    protected void tearDown() throws Exception {
        if (this.localServer != null) {
            this.localServer.stop();
        }
    }


    public void testReuseOfPersistentConnections() throws Exception {
        BasicHttpProcessor httpproc = new BasicHttpProcessor();
        httpproc.addInterceptor(new ResponseDate());
        httpproc.addInterceptor(new ResponseServer());
        httpproc.addInterceptor(new ResponseContent());
        httpproc.addInterceptor(new ResponseConnControl());
        
        this.localServer = new LocalTestServer(httpproc, null);
        this.localServer.register("/random/*", new RandomHandler());
        this.localServer.start();

        InetSocketAddress saddress = (InetSocketAddress) this.localServer.getServiceAddress();
        
        HttpParams params = new BasicHttpParams();
        HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
        HttpProtocolParams.setContentCharset(params, "UTF-8");
        HttpProtocolParams.setUserAgent(params, "TestAgent/1.1");
        HttpProtocolParams.setUseExpectContinue(params, false);
        HttpConnectionParams.setStaleCheckingEnabled(params, false);
        ConnManagerParams.setMaxTotalConnections(params, 5);
        ConnManagerParams.setMaxConnectionsPerRoute(params, 
                new ConnPerRouteBean(5));
        
        SchemeRegistry supportedSchemes = new SchemeRegistry();
        SocketFactory sf = PlainSocketFactory.getSocketFactory();
        supportedSchemes.register(new Scheme("http", sf, 80));
        
        ThreadSafeClientConnManager mgr = new ThreadSafeClientConnManager(
                params, supportedSchemes);

        DefaultHttpClient client = new DefaultHttpClient(mgr, params); 

        HttpHost target = new HttpHost(saddress.getHostName(), saddress.getPort(), "http");
        
        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 (int i = 0; i < workers.length; i++) {
            WorkerThread worker = workers[i];
            worker.start();
        }
        for (int i = 0; i < workers.length; i++) {
            WorkerThread worker = workers[i]; 
            workers[i].join(10000);
            Exception ex = worker.getException();
            if (ex != null) {
                throw ex;
            }
        }
        
        // Expect some connection in the pool
        assertTrue(mgr.getConnectionsInPool() > 0);

        mgr.shutdown();
    }

    private static class AlwaysCloseConn implements HttpResponseInterceptor {

        public void process(
                final HttpResponse response, 
                final HttpContext context) throws HttpException, IOException {
            response.setHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE);
        }
        
    }
    
    public void testReuseOfClosedConnections() throws Exception {
        BasicHttpProcessor httpproc = new BasicHttpProcessor();
        httpproc.addInterceptor(new ResponseDate());
        httpproc.addInterceptor(new ResponseServer());
        httpproc.addInterceptor(new ResponseContent());
        httpproc.addInterceptor(new AlwaysCloseConn());
        
        this.localServer = new LocalTestServer(httpproc, null);
        this.localServer.register("/random/*", new RandomHandler());
        this.localServer.start();

        InetSocketAddress saddress = (InetSocketAddress) this.localServer.getServiceAddress();
        
        HttpParams params = new BasicHttpParams();
        HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
        HttpProtocolParams.setContentCharset(params, "UTF-8");
        HttpProtocolParams.setUserAgent(params, "TestAgent/1.1");
        HttpProtocolParams.setUseExpectContinue(params, false);
        HttpConnectionParams.setStaleCheckingEnabled(params, false);
        ConnManagerParams.setMaxTotalConnections(params, 5);
        ConnManagerParams.setMaxConnectionsPerRoute(params, 
                new ConnPerRouteBean(5));
        
        SchemeRegistry supportedSchemes = new SchemeRegistry();
        SocketFactory sf = PlainSocketFactory.getSocketFactory();
        supportedSchemes.register(new Scheme("http", sf, 80));
        
        ThreadSafeClientConnManager mgr = new ThreadSafeClientConnManager(
                params, supportedSchemes);

        DefaultHttpClient client = new DefaultHttpClient(mgr, params); 

        HttpHost target = new HttpHost(saddress.getHostName(), saddress.getPort(), "http");
        
        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 (int i = 0; i < workers.length; i++) {
            WorkerThread worker = workers[i]; 
            worker.start();
        }
        for (int i = 0; i < workers.length; i++) {
            WorkerThread worker = workers[i]; 
            workers[i].join(10000);
            Exception ex = worker.getException();
            if (ex != null) {
                throw ex;
            }
        }
        
        // Expect zero connections in the pool
        assertEquals(0, mgr.getConnectionsInPool());

        mgr.shutdown();
    }

    public void testReuseOfAbortedConnections() throws Exception {
        BasicHttpProcessor httpproc = new BasicHttpProcessor();
        httpproc.addInterceptor(new ResponseDate());
        httpproc.addInterceptor(new ResponseServer());
        httpproc.addInterceptor(new ResponseContent());
        httpproc.addInterceptor(new ResponseConnControl());
        
        this.localServer = new LocalTestServer(httpproc, null);
        this.localServer.register("/random/*", new RandomHandler());
        this.localServer.start();

        InetSocketAddress saddress = (InetSocketAddress) this.localServer.getServiceAddress();
        
        HttpParams params = new BasicHttpParams();
        HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
        HttpProtocolParams.setContentCharset(params, "UTF-8");
        HttpProtocolParams.setUserAgent(params, "TestAgent/1.1");
        HttpProtocolParams.setUseExpectContinue(params, false);
        HttpConnectionParams.setStaleCheckingEnabled(params, false);
        ConnManagerParams.setMaxTotalConnections(params, 5);
        ConnManagerParams.setMaxConnectionsPerRoute(params, 
                new ConnPerRouteBean(5));
        
        SchemeRegistry supportedSchemes = new SchemeRegistry();
        SocketFactory sf = PlainSocketFactory.getSocketFactory();
        supportedSchemes.register(new Scheme("http", sf, 80));
        
        ThreadSafeClientConnManager mgr = new ThreadSafeClientConnManager(
                params, supportedSchemes);

        DefaultHttpClient client = new DefaultHttpClient(mgr, params); 

        HttpHost target = new HttpHost(saddress.getHostName(), saddress.getPort(), "http");
        
        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 (int i = 0; i < workers.length; i++) {
            WorkerThread worker = workers[i];
            worker.start();
        }
        for (int i = 0; i < workers.length; i++) {
            WorkerThread worker = workers[i]; 
            workers[i].join(10000);
            Exception ex = worker.getException();
            if (ex != null) {
                throw ex;
            }
        }
        
        // Expect zero connections in the pool
        assertEquals(0, mgr.getConnectionsInPool());

        mgr.shutdown();
    }
    
    public void testKeepAliveHeaderRespected() throws Exception {
        BasicHttpProcessor httpproc = new BasicHttpProcessor();
        httpproc.addInterceptor(new ResponseDate());
        httpproc.addInterceptor(new ResponseServer());
        httpproc.addInterceptor(new ResponseContent());
        httpproc.addInterceptor(new ResponseConnControl());
        httpproc.addInterceptor(new ResponseKeepAlive());
        
        this.localServer = new LocalTestServer(httpproc, null);
        this.localServer.register("/random/*", new RandomHandler());
        this.localServer.start();

        InetSocketAddress saddress = (InetSocketAddress) this.localServer.getServiceAddress();
        
        HttpParams params = new BasicHttpParams();
        HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
        HttpProtocolParams.setContentCharset(params, "UTF-8");
        HttpProtocolParams.setUserAgent(params, "TestAgent/1.1");
        HttpProtocolParams.setUseExpectContinue(params, false);
        HttpConnectionParams.setStaleCheckingEnabled(params, false);
        ConnManagerParams.setMaxTotalConnections(params, 1);
        ConnManagerParams.setMaxConnectionsPerRoute(params, 
                new ConnPerRouteBean(1));
        
        SchemeRegistry supportedSchemes = new SchemeRegistry();
        SocketFactory sf = PlainSocketFactory.getSocketFactory();
        supportedSchemes.register(new Scheme("http", sf, 80));
        
        ThreadSafeClientConnManager mgr = new ThreadSafeClientConnManager(
                params, supportedSchemes);

        DefaultHttpClient client = new DefaultHttpClient(mgr, params);
        HttpHost target = new HttpHost(saddress.getHostName(), saddress.getPort(), "http");
        
        HttpResponse response = client.execute(target, new HttpGet("/random/2000"));
        if(response.getEntity() != null)
            response.getEntity().consumeContent();
        
        assertEquals(1, mgr.getConnectionsInPool());
        assertEquals(1, localServer.getAcceptedConnectionCount());
        
        response = client.execute(target, new HttpGet("/random/2000"));
        if(response.getEntity() != null)
            response.getEntity().consumeContent();
        
        assertEquals(1, mgr.getConnectionsInPool());
        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"));
        if(response.getEntity() != null)
            response.getEntity().consumeContent();
        
        assertEquals(1, mgr.getConnectionsInPool());
        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"));
        if(response.getEntity() != null)
            response.getEntity().consumeContent();
        
        assertEquals(1, mgr.getConnectionsInPool());
        assertEquals(2, localServer.getAcceptedConnectionCount());
        

        mgr.shutdown();
    }    

    private static class WorkerThread extends Thread {

        private final URI requestURI;
        private final HttpHost target;
        private final HttpClient httpclient;
        private final int repetitions;
        private final boolean forceClose;

        private volatile Exception exception;
        
        public WorkerThread(
                final HttpClient httpclient, 
                final HttpHost target, 
                final URI requestURI,
                int repetitions,
                boolean forceClose) {
            super();
            this.httpclient = httpclient;
            this.requestURI = requestURI;
            this.target = target;
            this.repetitions = repetitions;
            this.forceClose = forceClose;
        }
        
        @Override
        public void run() {
            try {
                for (int i = 0; i < this.repetitions; i++) {
                    HttpGet httpget = new HttpGet(this.requestURI);
                    HttpResponse response = this.httpclient.execute(
                            this.target, 
                            httpget);
                    if (this.forceClose) {
                        httpget.abort();
                    } else {
                        HttpEntity entity = response.getEntity();
                        if (entity != null) {
                            entity.consumeContent();
                        }
                    }
                }
            } catch (Exception ex) {
                this.exception = ex;
            }
        }

        public Exception getException() {
            return exception;
        }
        
    }
    
    // A very basic keep-alive header interceptor, to add Keep-Alive: timeout=1
    // if there is no Connection: close header.
    private static class ResponseKeepAlive implements HttpResponseInterceptor {
        public void process(HttpResponse response, HttpContext context)
                throws HttpException, IOException {
            Header connection = response.getFirstHeader(HTTP.CONN_DIRECTIVE);
            if(connection != null) {
                if(!connection.getValue().equalsIgnoreCase("Close")) {
                    response.addHeader(HTTP.CONN_KEEP_ALIVE, "timeout=1");
                }
            }            
        }
    }
    
}

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