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/*
* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.io.*;
import java.net.BindException;
import java.net.InetSocketAddress;
import java.net.ProtocolFamily;
import java.nio.channels.Channel;
import java.nio.channels.DatagramChannel;
import java.nio.channels.Pipe;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.nio.channels.spi.AbstractSelector;
import java.nio.channels.spi.SelectorProvider;
import java.time.LocalTime;
import static java.net.StandardSocketOptions.SO_REUSEADDR;
import static java.net.StandardSocketOptions.SO_REUSEPORT;
/**
* A SelectorProvider, that can be loaded by the child rmid process, whose
* inheritedChannel method will create a new server socket channel and report
* it back to the parent process, over stdout.
*/
public class RMIDSelectorProvider extends SelectorProvider {
private final SelectorProvider provider;
private ServerSocketChannel channel;
public RMIDSelectorProvider() {
provider = sun.nio.ch.DefaultSelectorProvider.create();
}
public DatagramChannel openDatagramChannel()
throws IOException
{
return provider.openDatagramChannel();
}
public DatagramChannel openDatagramChannel(ProtocolFamily family)
throws IOException
{
return provider.openDatagramChannel(family);
}
public Pipe openPipe()
throws IOException
{
return provider.openPipe();
}
public AbstractSelector openSelector()
throws IOException
{
return provider.openSelector();
}
public ServerSocketChannel openServerSocketChannel()
throws IOException
{
return provider.openServerSocketChannel();
}
public SocketChannel openSocketChannel()
throws IOException
{
return provider.openSocketChannel();
}
public synchronized Channel inheritedChannel() throws IOException {
System.out.println("RMIDSelectorProvider.inheritedChannel");
if (channel == null) {
// Create and bind a new server socket channel
channel = ServerSocketChannel.open();
// Enable SO_REUSEADDR before binding
channel.setOption(SO_REUSEADDR, true);
// Enable SO_REUSEPORT, if supported, before binding
if (channel.supportedOptions().contains(SO_REUSEPORT)) {
channel.setOption(SO_REUSEPORT, true);
}
// when it comes here, these properties should have been set with
// a valid value, but assign a default value anyway.
long timeout = Long.getLong(
"test.java.rmi.testlibrary.RMIDSelectorProvider.timeout",
200_000);
long deadline = System.currentTimeMillis() + timeout;
int port = Integer.getInteger(
"test.java.rmi.testlibrary.RMIDSelectorProvider.port", 0);
while (true) {
try {
channel.bind(new InetSocketAddress(port));
break;
} catch (BindException ex) {
System.out.format("RMIDSelectorProvider: "
+ "failed to bind to port %d due to \"%s\", at %s%n",
port, ex.getMessage(), LocalTime.now());
}
if (System.currentTimeMillis() > deadline) {
System.out.format("RMIDSelectorProvider: "
+ "fail to bind to port %d after trying for "
+ "%d seconds, exiting rmid process, at %s%n",
port, timeout/1000, LocalTime.now());
channel.close();
// can not start rmid on specific port,
// there is no need to continue run rmid.
System.exit(1);
}
try {
Thread.sleep(1000);
} catch(InterruptedException ignore) { }
}
System.out.println(RMID.EPHEMERAL_MSG + channel.socket().getLocalPort());
}
return channel;
}
}
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