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Java example source code file (TestIdleConnectionEviction.java)

This example source code file (TestIdleConnectionEviction.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

clientconnectionmanager, defaulthttpclient, exception, httpclient, httpentity, httpget, httphost, httpurirequest, idleconnectionmonitor, override, schemeregistry, testidleconnectioneviction, threading, threads, threadsafeclientconnmanager, workerthread

The TestIdleConnectionEviction.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
 * 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.impl.conn;

import java.util.concurrent.TimeUnit;

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

import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.conn.ClientConnectionManager;
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.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.localserver.LocalTestServer;
import org.apache.http.localserver.ServerTestBase;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;

public class TestIdleConnectionEviction extends ServerTestBase {

    public TestIdleConnectionEviction(String testName) {

    public static void main(String args[]) {
        String[] testCaseName = { TestIdleConnectionEviction.class.getName() };

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

    protected void setUp() throws Exception {
        this.localServer = new LocalTestServer(null, null);
    public void testIdleConnectionEviction() throws Exception {
        HttpParams params = new BasicHttpParams();
        HttpConnectionParams.setStaleCheckingEnabled(params, false);
        ConnManagerParams.setMaxTotalConnections(params, 50);
        ConnManagerParams.setMaxConnectionsPerRoute(params, new ConnPerRouteBean(10));
        SchemeRegistry schemeRegistry = new SchemeRegistry();
        schemeRegistry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
        ThreadSafeClientConnManager cm = new ThreadSafeClientConnManager(params, schemeRegistry);
        DefaultHttpClient httpclient = new DefaultHttpClient(cm, params);
        IdleConnectionMonitor idleConnectionMonitor = new IdleConnectionMonitor(cm);          
        HttpHost target = new HttpHost(this.localServer.getServiceHostName(), 
        HttpGet httpget = new HttpGet("/random/1024"); 
        WorkerThread[] workers = new WorkerThread[5];
        for (int i = 0; i < workers.length; i++) {
            workers[i] = new WorkerThread(httpclient, target, httpget, 2000);
        for (int i = 0; i < workers.length; i++) {
        for (int i = 0; i < workers.length; i++) {
            Exception ex = workers[i].getException();
            if (ex != null) {
                throw ex;
    static class WorkerThread extends Thread {

        private final HttpClient httpclient;
        private final HttpHost target;
        private final HttpUriRequest request;
        private final int count;
        private volatile Exception ex;
        public WorkerThread(
                final HttpClient httpclient, 
                final HttpHost target, 
                final HttpUriRequest request, 
                int count) {
            this.httpclient = httpclient;
            this.target = target;
            this.request = request;
            this.count = count;
        public void run() {
            try {
                for (int i = 0; i < this.count; i++) {
                    HttpResponse response = this.httpclient.execute(this.target, this.request);
                    int status = response.getStatusLine().getStatusCode();
                    if (status != 200) {
                        throw new ClientProtocolException("Unexpected status code: " + status);
                    HttpEntity entity = response.getEntity();
                    if (entity != null) {
            } catch (Exception ex) {
                this.ex = ex;

        public Exception getException() {
            return ex;

    public static class IdleConnectionMonitor extends Thread {
        private final ClientConnectionManager cm;
        private volatile boolean shutdown;
        public IdleConnectionMonitor(final ClientConnectionManager cm) {
            this.cm = cm;

        public void run() {
            try {
                while (!this.shutdown) {
                    synchronized (this) {
                        this.cm.closeIdleConnections(1, TimeUnit.MILLISECONDS);
            } catch (InterruptedException ex) {
                // terminate
        public void shutdown() {
            this.shutdown = true;
            synchronized (this) {

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