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* 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
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/* @test
* @bug 4639943
* @summary Checks that Windows behavior matches Solaris for
* various read/select combinations.
* @author kladko
*/
import java.net.*;
import java.nio.*;
import java.nio.channels.*;
public class SelectAfterRead {
final static int TIMEOUT = 1000;
public static void main(String[] argv) throws Exception {
InetAddress lh = InetAddress.getByName(ByteServer.LOCALHOST);
// server: accept connection and write one byte
ByteServer server = new ByteServer(1);
server.start();
Selector sel = Selector.open();
SocketChannel sc = SocketChannel.open();
sc.connect(new InetSocketAddress(lh, server.port()));
sc.read(ByteBuffer.allocate(1));
sc.configureBlocking(false);
sc.register(sel, SelectionKey.OP_READ);
// previously on Windows select would select channel here, although there was
// nothing to read
if (sel.selectNow() != 0)
throw new Exception("Select returned nonzero value");
sc.close();
sel.close();
server.exit();
// Now we will test a two reads combination
// server: accept connection and write two bytes
server = new ByteServer(2);
server.start();
sc = SocketChannel.open();
sc.connect(new InetSocketAddress(lh, server.port()));
sc.configureBlocking(false);
sel = Selector.open();
sc.register(sel, SelectionKey.OP_READ);
if (sel.select(TIMEOUT) != 1)
throw new Exception("One selected key expected");
sel.selectedKeys().clear();
// previously on Windows a channel would get selected only once
if (sel.selectNow() != 1)
throw new Exception("One selected key expected");
// Previously on Windows two consequent reads would cause select()
// to select a channel, although there was nothing remaining to
// read in the channel
if (sc.read(ByteBuffer.allocate(1)) != 1)
throw new Exception("One byte expected");
if (sc.read(ByteBuffer.allocate(1)) != 1)
throw new Exception("One byte expected");
if (sel.selectNow() != 0)
throw new Exception("Select returned nonzero value");
sc.close();
sel.close();
server.exit();
}
}