author | dfuchs |
Tue, 01 Oct 2019 12:10:33 +0100 | |
changeset 58423 | 54de0c861d32 |
parent 55047 | 3131927311ee |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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/** |
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* @test |
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* @library /test/lib |
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* @modules java.management java.base/java.io:+open java.base/java.net:+open |
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* @run main/othervm -Djava.net.preferIPv4Stack=true UnreferencedMulticastSockets |
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* @run main/othervm UnreferencedMulticastSockets |
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* @summary Check that unreferenced multicast sockets are closed |
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*/ |
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import java.io.FileDescriptor; |
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import java.lang.management.ManagementFactory; |
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import java.lang.management.OperatingSystemMXBean; |
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import java.lang.ref.ReferenceQueue; |
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import java.lang.ref.WeakReference; |
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import java.lang.reflect.Field; |
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import java.io.IOException; |
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import java.net.DatagramPacket; |
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import java.net.DatagramSocket; |
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import java.net.DatagramSocketImpl; |
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import java.net.InetAddress; |
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import java.net.InetSocketAddress; |
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import java.net.MulticastSocket; |
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import java.net.UnknownHostException; |
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import java.nio.file.Files; |
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import java.nio.file.Path; |
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import java.nio.file.Paths; |
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import java.util.ArrayDeque; |
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import java.util.List; |
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import java.util.Optional; |
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import java.util.concurrent.Phaser; |
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import java.util.concurrent.TimeUnit; |
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import jdk.test.lib.net.IPSupport; |
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import com.sun.management.UnixOperatingSystemMXBean; |
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public class UnreferencedMulticastSockets { |
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/** |
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* The set of sockets we have to check up on. |
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*/ |
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final static ArrayDeque<NamedWeak> pendingSockets = new ArrayDeque<>(5); |
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/** |
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* Queued objects when they are unreferenced. |
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*/ |
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final static ReferenceQueue<Object> pendingQueue = new ReferenceQueue<>(); |
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// Server to echo a datagram packet |
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static class Server implements Runnable { |
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MulticastSocket ss; |
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final int port; |
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final Phaser phaser = new Phaser(2); |
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Server() throws IOException { |
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InetAddress loopback = InetAddress.getLoopbackAddress(); |
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InetSocketAddress serverAddress = |
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new InetSocketAddress(loopback, 0); |
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ss = new MulticastSocket(serverAddress); |
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port = ss.getLocalPort(); |
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System.out.printf(" DatagramServer addr: %s: %d%n", |
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this.getHost(), this.getPort()); |
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pendingSockets.add(new NamedWeak(ss, pendingQueue, "serverMulticastSocket")); |
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extractRefs(ss, "serverMulticastSocket"); |
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} |
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InetAddress getHost() throws UnknownHostException { |
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InetAddress localhost = InetAddress.getLoopbackAddress(); |
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return localhost; |
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} |
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int getPort() { |
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return port; |
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} |
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// Receive a byte and send back a byte |
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public void run() { |
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try { |
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byte[] buffer = new byte[50]; |
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DatagramPacket p = new DatagramPacket(buffer, buffer.length); |
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ss.receive(p); |
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System.out.printf("Server: ping received from: %s%n", p.getSocketAddress()); |
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phaser.arriveAndAwaitAdvance(); // await the client... |
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buffer[0] += 1; |
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System.out.printf("Server: sending echo to: %s%n", p.getSocketAddress()); |
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ss.send(p); // send back +1 |
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System.out.printf("Server: awaiting client%n"); |
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phaser.arriveAndAwaitAdvance(); // await the client... |
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// do NOT close but 'forget' the socket reference |
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System.out.printf("Server: forgetting socket...%n"); |
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ss = null; |
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} catch (Throwable ioe) { |
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ioe.printStackTrace(); |
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} |
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} |
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} |
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public static void main(String args[]) throws Exception { |
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IPSupport.throwSkippedExceptionIfNonOperational(); |
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InetSocketAddress clientAddress = |
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new InetSocketAddress(InetAddress.getLoopbackAddress(), 0); |
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127 |
|
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// Create and close a MulticastSocket to warm up the FD count for side effects. |
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try (MulticastSocket s = new MulticastSocket(clientAddress)) { |
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// no-op; close immediately |
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s.getLocalPort(); // no-op |
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} |
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133 |
|
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long fdCount0 = getFdCount(); |
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listProcFD(); |
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136 |
|
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137 |
// start a server |
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138 |
Server svr = new Server(); |
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Thread thr = new Thread(svr); |
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thr.start(); |
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141 |
|
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// It is possible under some circumstances that the client |
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143 |
// might get bound to the same port than the server: this |
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// would make the test fail - so if this happen we try to |
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// bind to a specific port by incrementing the server port. |
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146 |
MulticastSocket client = null; |
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int serverPort = svr.getPort(); |
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int maxtries = 20; |
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for (int i = 0; i < maxtries; i++) { |
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try { |
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System.out.printf("Trying to bind client to: %s%n", clientAddress); |
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client = new MulticastSocket(clientAddress); |
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if (client.getLocalPort() != svr.getPort()) break; |
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client.close(); |
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155 |
} catch (IOException x) { |
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156 |
System.out.printf("Couldn't create client after %d attempts: %s%n", i, x); |
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if (i == maxtries) throw x; |
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158 |
} |
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159 |
if (i == maxtries) { |
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160 |
String msg = String.format("Couldn't create client after %d attempts", i); |
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System.out.println(msg); |
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162 |
throw new AssertionError(msg); |
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163 |
} |
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clientAddress = new InetSocketAddress(clientAddress.getAddress(), serverPort + i); |
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165 |
} |
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166 |
|
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167 |
System.out.printf(" client bound port: %s:%d%n", |
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168 |
client.getLocalAddress(), client.getLocalPort()); |
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client.connect(svr.getHost(), svr.getPort()); |
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pendingSockets.add(new NamedWeak(client, pendingQueue, "clientMulticastSocket")); |
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171 |
extractRefs(client, "clientMulticastSocket"); |
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172 |
|
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173 |
byte[] msg = new byte[1]; |
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|
174 |
msg[0] = 1; |
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175 |
DatagramPacket p = new DatagramPacket(msg, msg.length, svr.getHost(), svr.getPort()); |
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client.send(p); |
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177 |
System.out.printf(" ping sent to: %s:%d%n", svr.getHost(), svr.getPort()); |
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svr.phaser.arriveAndAwaitAdvance(); // wait until the server has received its packet |
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179 |
|
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180 |
p = new DatagramPacket(msg, msg.length); |
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|
181 |
client.receive(p); |
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182 |
|
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183 |
System.out.printf(" echo received from: %s%n", p.getSocketAddress()); |
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184 |
if (msg[0] != 2) { |
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185 |
throw new AssertionError("incorrect data received: expected: 2, actual: " + msg[0]); |
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186 |
} |
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187 |
svr.phaser.arriveAndAwaitAdvance(); // let the server null out its socket |
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188 |
|
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189 |
// Do NOT close the MulticastSocket; forget it |
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190 |
|
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|
191 |
Object ref; |
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|
192 |
int loops = 20; |
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|
193 |
while (!pendingSockets.isEmpty() && loops-- > 0) { |
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|
194 |
ref = pendingQueue.remove(1000L); |
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|
195 |
if (ref != null) { |
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|
196 |
pendingSockets.remove(ref); |
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|
197 |
System.out.printf(" ref freed: %s, remaining: %d%n", ref, pendingSockets.size()); |
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|
198 |
} else { |
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|
199 |
client = null; |
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|
200 |
p = null; |
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|
201 |
msg = null; |
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|
202 |
System.gc(); |
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|
203 |
} |
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|
204 |
} |
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|
205 |
|
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|
206 |
thr.join(); |
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|
207 |
|
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|
208 |
// List the open file descriptors |
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|
209 |
long fdCount = getFdCount(); |
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|
210 |
System.out.printf("Initial fdCount: %d, final fdCount: %d%n", fdCount0, fdCount); |
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|
211 |
listProcFD(); |
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changeset
|
212 |
|
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|
213 |
if (loops == 0) { |
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|
214 |
throw new AssertionError("Not all references reclaimed"); |
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|
215 |
} |
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|
216 |
} |
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|
217 |
|
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|
218 |
// Get the count of open file descriptors, or -1 if not available |
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|
219 |
private static long getFdCount() { |
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|
220 |
OperatingSystemMXBean mxBean = ManagementFactory.getOperatingSystemMXBean(); |
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|
221 |
return (mxBean instanceof UnixOperatingSystemMXBean) |
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|
222 |
? ((UnixOperatingSystemMXBean) mxBean).getOpenFileDescriptorCount() |
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|
223 |
: -1L; |
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|
224 |
} |
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|
225 |
|
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|
226 |
// Reflect to find references in the socket implementation that will be gc'd |
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|
227 |
private static void extractRefs(MulticastSocket s, String name) { |
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|
228 |
try { |
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|
229 |
|
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|
230 |
Field socketImplField = DatagramSocket.class.getDeclaredField("impl"); |
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|
231 |
socketImplField.setAccessible(true); |
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|
232 |
Object socketImpl = socketImplField.get(s); |
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|
233 |
|
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|
234 |
Field fileDescriptorField = DatagramSocketImpl.class.getDeclaredField("fd"); |
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|
235 |
fileDescriptorField.setAccessible(true); |
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|
236 |
FileDescriptor fileDescriptor = (FileDescriptor) fileDescriptorField.get(socketImpl); |
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|
237 |
extractRefs(fileDescriptor, name); |
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|
238 |
|
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|
239 |
Class<?> socketImplClass = socketImpl.getClass(); |
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|
240 |
System.out.printf("socketImplClass: %s%n", socketImplClass); |
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rriggs
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|
241 |
if (socketImplClass.getName().equals("java.net.TwoStacksPlainDatagramSocketImpl")) { |
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rriggs
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|
242 |
Field fileDescriptor1Field = socketImplClass.getDeclaredField("fd1"); |
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|
243 |
fileDescriptor1Field.setAccessible(true); |
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|
244 |
FileDescriptor fileDescriptor1 = (FileDescriptor) fileDescriptor1Field.get(socketImpl); |
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|
245 |
extractRefs(fileDescriptor1, name + "::twoStacksFd1"); |
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|
246 |
|
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|
247 |
} else { |
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|
248 |
System.out.printf("socketImpl class name not matched: %s != %s%n", |
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|
249 |
socketImplClass.getName(), "java.net.TwoStacksPlainDatagramSocketImpl"); |
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changeset
|
250 |
} |
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|
251 |
} catch (NoSuchFieldException | IllegalAccessException ex) { |
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ex.printStackTrace(); |
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throw new AssertionError("missing field", ex); |
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} |
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} |
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|
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private static void extractRefs(FileDescriptor fileDescriptor, String name) { |
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Object cleanup = null; |
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int rawfd = -1; |
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try { |
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if (fileDescriptor != null) { |
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Field fd1Field = FileDescriptor.class.getDeclaredField("fd"); |
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fd1Field.setAccessible(true); |
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rawfd = fd1Field.getInt(fileDescriptor); |
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|
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Field cleanupfdField = FileDescriptor.class.getDeclaredField("cleanup"); |
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cleanupfdField.setAccessible(true); |
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cleanup = cleanupfdField.get(fileDescriptor); |
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pendingSockets.add(new NamedWeak(fileDescriptor, pendingQueue, |
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name + "::fileDescriptor: " + rawfd)); |
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pendingSockets.add(new NamedWeak(cleanup, pendingQueue, name + "::fdCleanup: " + rawfd)); |
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|
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} |
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} catch (NoSuchFieldException | IllegalAccessException ex) { |
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ex.printStackTrace(); |
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throw new AssertionError("missing field", ex); |
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} finally { |
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System.out.print(String.format(" %s:: fd: %s, fd: %d, cleanup: %s%n", |
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name, fileDescriptor, rawfd, cleanup)); |
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} |
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} |
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|
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/** |
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* Method to list the open file descriptors (if supported by the 'lsof' command). |
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*/ |
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static void listProcFD() { |
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List<String> lsofDirs = List.of("/usr/bin", "/usr/sbin"); |
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Optional<Path> lsof = lsofDirs.stream() |
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.map(s -> Paths.get(s, "lsof")) |
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.filter(f -> Files.isExecutable(f)) |
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.findFirst(); |
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lsof.ifPresent(exe -> { |
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try { |
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294 |
System.out.printf("Open File Descriptors:%n"); |
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long pid = ProcessHandle.current().pid(); |
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ProcessBuilder pb = new ProcessBuilder(exe.toString(), "-p", Integer.toString((int) pid)); |
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pb.inheritIO(); |
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Process p = pb.start(); |
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p.waitFor(10, TimeUnit.SECONDS); |
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} catch (IOException | InterruptedException ie) { |
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301 |
ie.printStackTrace(); |
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302 |
} |
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|
303 |
}); |
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|
304 |
} |
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305 |
|
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306 |
|
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307 |
// Simple class to identify which refs have been queued |
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308 |
static class NamedWeak extends WeakReference<Object> { |
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309 |
private final String name; |
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310 |
|
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311 |
NamedWeak(Object o, ReferenceQueue<Object> queue, String name) { |
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312 |
super(o, queue); |
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this.name = name; |
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|
314 |
} |
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315 |
|
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|
316 |
public String toString() { |
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317 |
return name + "; " + super.toString(); |
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318 |
} |
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|
319 |
} |
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320 |
} |