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/*
* Copyright (c) 2018, 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.
*/
/**
* @test
* @bug 8198372
* @modules jdk.net java.base/sun.nio.ch:+open
* @run testng Basic
* @summary Basic tests for jdk.nio.Channels
*/
import java.io.Closeable;
import java.io.FileDescriptor;
import java.io.IOException;
import java.lang.reflect.Field;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import jdk.nio.Channels;
import jdk.nio.Channels.SelectableChannelCloser;
import sun.nio.ch.IOUtil;
import org.testng.annotations.Test;
import static org.testng.Assert.*;
@Test
public class Basic {
/**
* A loopback connection
*/
static class Connection implements Closeable {
private final SocketChannel sc1;
private final SocketChannel sc2;
private Connection(SocketChannel sc1, SocketChannel sc2) {
this.sc1 = sc1;
this.sc2 = sc2;
}
static Connection open() throws IOException {
try (ServerSocketChannel ssc = ServerSocketChannel.open()) {
InetAddress lb = InetAddress.getLoopbackAddress();
ssc.bind(new InetSocketAddress(lb, 0));
SocketChannel sc1 = SocketChannel.open(ssc.getLocalAddress());
SocketChannel sc2 = ssc.accept();
return new Connection(sc1, sc2);
}
}
SocketChannel channel1() {
return sc1;
}
SocketChannel channel2() {
return sc2;
}
public void close() throws IOException {
try {
sc1.close();
} finally {
sc2.close();
}
}
}
/**
* A SelectableChannelCloser that tracks if the implCloseChannel and
* implReleaseChannel methods are invoked
*/
static class Closer implements SelectableChannelCloser {
int closeCount;
SelectableChannel invokedToClose;
int releaseCount;
SelectableChannel invokedToRelease;
@Override
public void implCloseChannel(SelectableChannel sc) {
closeCount++;
invokedToClose = sc;
}
@Override
public void implReleaseChannel(SelectableChannel sc) {
releaseCount++;
invokedToRelease = sc;
}
}
/**
* Basic test of channel registered with Selector
*/
public void testSelect() throws IOException {
Selector sel = Selector.open();
try (Connection connection = Connection.open()) {
// create channel with the file descriptor from one end of the connection
FileDescriptor fd = getFD(connection.channel1());
SelectableChannel ch = Channels.readWriteSelectableChannel(fd, new Closer());
// register for read events, channel should not be selected
ch.configureBlocking(false);
SelectionKey key = ch.register(sel, SelectionKey.OP_READ);
int n = sel.selectNow();
assertTrue(n == 0);
// write bytes to other end of connection
SocketChannel peer = connection.channel2();
ByteBuffer msg = ByteBuffer.wrap("hello".getBytes("UTF-8"));
int nwrote = peer.write(msg);
assertTrue(nwrote >= 0);
// channel should be selected
n = sel.select();
assertTrue(n == 1);
assertTrue(sel.selectedKeys().contains(key));
assertTrue(key.isReadable());
assertFalse(key.isWritable());
sel.selectedKeys().clear();
// change interest set for writing, channel should be selected
key.interestOps(SelectionKey.OP_WRITE);
n = sel.select();
assertTrue(n == 1);
assertTrue(sel.selectedKeys().contains(key));
assertTrue(key.isWritable());
assertFalse(key.isReadable());
sel.selectedKeys().clear();
// change interest set for reading + writing, channel should be selected
key.interestOps(SelectionKey.OP_READ | SelectionKey.OP_WRITE);
n = sel.select();
assertTrue(n == 1);
assertTrue(sel.selectedKeys().contains(key));
assertTrue(key.isWritable());
assertTrue(key.isReadable());
sel.selectedKeys().clear();
// change interest set to 0 to deregister, channel should not be selected
key.interestOps(0);
n = sel.selectNow();
assertTrue(n == 0);
} finally {
sel.close();
}
}
/**
* Test that the SelectableChannelCloser implCloseChannel method is invoked.
*/
public void testImplCloseChannel() throws IOException {
try (Connection connection = Connection.open()) {
FileDescriptor fd = getFD(connection.channel1());
Closer closer = new Closer();
SelectableChannel ch = Channels.readWriteSelectableChannel(fd, closer);
// close channel twice, checking that the closer is invoked only once
for (int i=0; i<2; i++) {
ch.close();
// implCloseChannel should been invoked once
assertTrue(closer.closeCount == 1);
assertTrue(closer.invokedToClose == ch);
// implReleaseChannel should not have been invoked
assertTrue(closer.releaseCount == 0);
}
}
}
/**
* Test that the SelectableChannelCloser implReleaseChannel method is invoked.
*/
public void testImplReleaseChannel() throws IOException {
Selector sel = Selector.open();
try (Connection connection = Connection.open()) {
FileDescriptor fd = getFD(connection.channel1());
Closer closer = new Closer();
SelectableChannel ch = Channels.readWriteSelectableChannel(fd, closer);
// register with Selector, invoking selectNow to ensure registered
ch.configureBlocking(false);
ch.register(sel, SelectionKey.OP_WRITE);
sel.selectNow();
// close channel
ch.close();
// implCloseChannel should have been invoked
assertTrue(closer.closeCount == 1);
assertTrue(closer.invokedToClose == ch);
// implReleaseChannel should not have been invoked
assertTrue(closer.releaseCount == 0);
// flush the selector
sel.selectNow();
// implReleaseChannel should have been invoked
assertTrue(closer.releaseCount == 1);
assertTrue(closer.invokedToRelease == ch);
} finally {
sel.close();
}
}
@Test(expectedExceptions = IllegalArgumentException.class)
public void testInvalidFileDescriptor() throws IOException {
FileDescriptor fd = IOUtil.newFD(-1);
Channels.readWriteSelectableChannel(fd, new SelectableChannelCloser() {
@Override
public void implCloseChannel(SelectableChannel sc) { }
@Override
public void implReleaseChannel(SelectableChannel sc) { }
});
}
@Test(expectedExceptions = NullPointerException.class)
public void testNullFileDescriptor() throws IOException {
Channels.readWriteSelectableChannel(null, new SelectableChannelCloser() {
@Override
public void implCloseChannel(SelectableChannel sc) { }
@Override
public void implReleaseChannel(SelectableChannel sc) { }
});
}
@Test(expectedExceptions = NullPointerException.class)
public void testNullCloser() throws IOException {
try (Connection connection = Connection.open()) {
FileDescriptor fd = getFD(connection.channel1());
Channels.readWriteSelectableChannel(fd, null);
}
}
private static FileDescriptor getFD(SocketChannel sc) {
try {
Class<?> clazz = sc.getClass();
Field f = clazz.getDeclaredField("fd");
f.setAccessible(true);
return (FileDescriptor) f.get(sc);
} catch (Exception e) {
throw new Error(e);
}
}
}
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