/**
* 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.
*/
package org.apache.zookeeper.test;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.jute.BinaryOutputArchive;
import org.apache.zookeeper.proto.ConnectRequest;
import org.junit.Assert;
import org.junit.Test;
public class MaxCnxnsTest extends ClientBase {
final private static int numCnxns = 30;
AtomicInteger numConnected = new AtomicInteger(0);
String host;
int port;
@Override
public void setUp() throws Exception {
maxCnxns = numCnxns;
super.setUp();
}
class CnxnThread extends Thread {
public CnxnThread(int i) {
super("CnxnThread-"+i);
}
public void run() {
SocketChannel sChannel = null;
try {
/*
* For future unwary socket programmers: although connect 'blocks' it
* does not require an accept on the server side to return. Therefore
* you can not assume that all the sockets are connected at the end of
* this for loop.
*/
sChannel = SocketChannel.open();
sChannel.connect(new InetSocketAddress(host,port));
// Construct a connection request
ConnectRequest conReq = new ConnectRequest(0, 0,
10000, 0, "password".getBytes());
ByteArrayOutputStream baos = new ByteArrayOutputStream();
BinaryOutputArchive boa = BinaryOutputArchive.getArchive(baos);
boa.writeInt(-1, "len");
conReq.serialize(boa, "connect");
baos.close();
ByteBuffer bb = ByteBuffer.wrap(baos.toByteArray());
bb.putInt(bb.capacity() - 4);
bb.rewind();
/* Send a connect request. Any socket that has been closed (or at least
* not added to the cnxn list on the server) will not have any bytes to
* read and get an eof.
*
* The trick here was finding a call that caused the server to put
* bytes in the input stream without closing the cnxn. None of
* the four letter commands do that, so we actually try to create
* a session which should send us something back, while maintaining
* the connection.
*/
int eof = sChannel.write(bb);
// If the socket times out, we count that as Assert.failed -
// the server should respond within 10s
sChannel.socket().setSoTimeout(10000);
if (!sChannel.socket().isClosed()){
eof = sChannel.socket().getInputStream().read();
if (eof != -1) {
numConnected.incrementAndGet();
}
}
}
catch (IOException io) {
// "Connection reset by peer"
} finally {
if (sChannel != null) {
try {
sChannel.close();
} catch (Exception e) {
// Do nothing
}
}
}
}
}
/**
* Verify the ability to limit the number of concurrent connections.
* @throws IOException
* @throws InterruptedException
*/
@Test
public void testMaxCnxns() throws IOException, InterruptedException{
String split[] = hostPort.split(":");
host = split[0];
port = Integer.parseInt(split[1]);
int numThreads = numCnxns + 5;
CnxnThread[] threads = new CnxnThread[numThreads];
for (int i=0;i<numCnxns;++i) {
threads[i] = new CnxnThread(i);
}
for (int i=0;i<numCnxns;++i) {
threads[i].start();
}
for (int i=0;i<numCnxns;++i) {
threads[i].join();
}
Assert.assertSame(numCnxns,numConnected.get());
}
}