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Java example source code file (TestConnectionAutoRelease.java)

This example source code file (TestConnectionAutoRelease.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

clientconnectionrequest, connectionpooltimeoutexception, connperroutebean, defaulthttpclient, httpentity, httpexception, httpget, httphost, httpparams, httpresponse, httproute, io, ioexception, managedclientconnection, threading, threads, threadsafeclientconnmanager

The TestConnectionAutoRelease.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.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.concurrent.TimeUnit;

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

import org.apache.http.HttpEntity;
import org.apache.http.HttpException;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.MalformedChunkCodingException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.params.ConnPerRouteBean;
import org.apache.http.conn.params.ConnManagerParams;
import org.apache.http.conn.routing.HttpRoute;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.entity.BasicHttpEntity;
import org.apache.http.impl.DefaultHttpServerConnection;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;
import org.apache.http.localserver.ServerTestBase;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.ExecutionContext;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.HttpRequestHandler;
import org.apache.http.util.EntityUtils;

public class TestConnectionAutoRelease extends ServerTestBase {

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

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

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

    public ThreadSafeClientConnManager createTSCCM(HttpParams params,
                                                   SchemeRegistry schreg) {
        if (params == null)
            params = defaultParams;
        if (schreg == null)
            schreg = supportedSchemes;
        return new ThreadSafeClientConnManager(params, schreg);
    }

    public void testReleaseOnEntityConsumeContent() throws Exception {
        HttpParams params = defaultParams.copy();
        ConnManagerParams.setMaxTotalConnections
            (params, 1);
        ConnManagerParams.setMaxConnectionsPerRoute
            (params, new ConnPerRouteBean(1));
        ThreadSafeClientConnManager mgr = createTSCCM(params, null);

        // Zero connections in the pool
        assertEquals(0, mgr.getConnectionsInPool());
        
        DefaultHttpClient client = new DefaultHttpClient(mgr, params); 

        // Get some random data
        HttpGet httpget = new HttpGet("/random/20000"); 
        HttpHost target = getServerHttp();
        
        HttpResponse response = client.execute(target, httpget);

        ClientConnectionRequest connreq = mgr.requestConnection(new HttpRoute(target), null);
        try {
            connreq.getConnection(250, TimeUnit.MILLISECONDS);
            fail("ConnectionPoolTimeoutException should have been thrown");
        } catch (ConnectionPoolTimeoutException expected) {
        }
        
        HttpEntity e = response.getEntity();
        assertNotNull(e);
        e.consumeContent();
        
        // Expect one connection in the pool
        assertEquals(1, mgr.getConnectionsInPool());

        // Make sure one connection is available
        connreq = mgr.requestConnection(new HttpRoute(target), null);
        ManagedClientConnection conn = connreq.getConnection(250, TimeUnit.MILLISECONDS);
        
        mgr.releaseConnection(conn, -1, null);
        
        mgr.shutdown();
    }
    
    public void testReleaseOnEntityWriteTo() throws Exception {
        HttpParams params = defaultParams.copy();
        ConnManagerParams.setMaxTotalConnections
            (params, 1);
        ConnManagerParams.setMaxConnectionsPerRoute
            (params, new ConnPerRouteBean(1));
        ThreadSafeClientConnManager mgr = createTSCCM(params, null);

        // Zero connections in the pool
        assertEquals(0, mgr.getConnectionsInPool());
        
        DefaultHttpClient client = new DefaultHttpClient(mgr, params); 

        // Get some random data
        HttpGet httpget = new HttpGet("/random/20000"); 
        HttpHost target = getServerHttp();
        
        HttpResponse response = client.execute(target, httpget);

        ClientConnectionRequest connreq = mgr.requestConnection(new HttpRoute(target), null);
        try {
            connreq.getConnection(250, TimeUnit.MILLISECONDS);
            fail("ConnectionPoolTimeoutException should have been thrown");
        } catch (ConnectionPoolTimeoutException expected) {
        }
        
        HttpEntity e = response.getEntity();
        assertNotNull(e);
        ByteArrayOutputStream outsteam = new ByteArrayOutputStream(); 
        e.writeTo(outsteam);
        
        // Expect one connection in the pool
        assertEquals(1, mgr.getConnectionsInPool());

        // Make sure one connection is available
        connreq = mgr.requestConnection(new HttpRoute(target), null);
        ManagedClientConnection conn = connreq.getConnection(250, TimeUnit.MILLISECONDS);
        
        mgr.releaseConnection(conn, -1, null);
        
        mgr.shutdown();
    }
    
    public void testReleaseOnAbort() throws Exception {
        HttpParams params = defaultParams.copy();
        ConnManagerParams.setMaxTotalConnections
            (params, 1);
        ConnManagerParams.setMaxConnectionsPerRoute
            (params, new ConnPerRouteBean(1));
        ThreadSafeClientConnManager mgr = createTSCCM(params, null);

        // Zero connections in the pool
        assertEquals(0, mgr.getConnectionsInPool());
        
        DefaultHttpClient client = new DefaultHttpClient(mgr, params); 

        // Get some random data
        HttpGet httpget = new HttpGet("/random/20000"); 
        HttpHost target = getServerHttp();
        
        HttpResponse response = client.execute(target, httpget);

        ClientConnectionRequest connreq = mgr.requestConnection(new HttpRoute(target), null);
        try {
            connreq.getConnection(250, TimeUnit.MILLISECONDS);
            fail("ConnectionPoolTimeoutException should have been thrown");
        } catch (ConnectionPoolTimeoutException expected) {
        }
        
        HttpEntity e = response.getEntity();
        assertNotNull(e);
        httpget.abort();
        
        // Expect zero connections in the pool
        assertEquals(0, mgr.getConnectionsInPool());

        // Make sure one connection is available
        connreq = mgr.requestConnection(new HttpRoute(target), null);
        ManagedClientConnection conn = connreq.getConnection(250, TimeUnit.MILLISECONDS);
        
        mgr.releaseConnection(conn, -1, null);
        
        mgr.shutdown();
    }

    public void testReleaseOnIOException() throws Exception {
        
        localServer.register("/dropdead", new HttpRequestHandler() {

            public void handle(
                    final HttpRequest request, 
                    final HttpResponse response, 
                    final HttpContext context) throws HttpException, IOException {
                BasicHttpEntity entity = new BasicHttpEntity() {

                    @Override
                    public void writeTo(
                            final OutputStream outstream) throws IOException {
                        byte[] tmp = new byte[5];
                        outstream.write(tmp);
                        outstream.flush();
                        
                        // do something comletely ugly in order to trigger 
                        // MalformedChunkCodingException
                        DefaultHttpServerConnection conn = (DefaultHttpServerConnection) 
                            context.getAttribute(ExecutionContext.HTTP_CONNECTION);
                        try {
                            conn.sendResponseHeader(response);
                        } catch (HttpException ignore) {
                        }
                    }
                    
                } ;
                entity.setChunked(true);
                response.setEntity(entity);
            }
            
        });
        
        HttpParams params = defaultParams.copy();
        ConnManagerParams.setMaxTotalConnections
            (params, 1);
        ConnManagerParams.setMaxConnectionsPerRoute
            (params, new ConnPerRouteBean(1));
        ThreadSafeClientConnManager mgr = createTSCCM(params, null);

        // Zero connections in the pool
        assertEquals(0, mgr.getConnectionsInPool());
        
        DefaultHttpClient client = new DefaultHttpClient(mgr, params); 

        // Get some random data
        HttpGet httpget = new HttpGet("/dropdead"); 
        HttpHost target = getServerHttp();
        
        HttpResponse response = client.execute(target, httpget);

        ClientConnectionRequest connreq = mgr.requestConnection(new HttpRoute(target), null);
        try {
            connreq.getConnection(250, TimeUnit.MILLISECONDS);
            fail("ConnectionPoolTimeoutException should have been thrown");
        } catch (ConnectionPoolTimeoutException expected) {
        }
        
        HttpEntity e = response.getEntity();
        assertNotNull(e);
        // Read the content
        try {
            EntityUtils.toByteArray(e);
            fail("MalformedChunkCodingException should have been thrown");
        } catch (MalformedChunkCodingException expected) {
            
        }
        
        // Expect zero connections in the pool
        assertEquals(0, mgr.getConnectionsInPool());

        // Make sure one connection is available
        connreq = mgr.requestConnection(new HttpRoute(target), null);
        ManagedClientConnection conn = connreq.getConnection(250, TimeUnit.MILLISECONDS);
        
        mgr.releaseConnection(conn, -1, null);
        
        mgr.shutdown();
    }
    
}

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