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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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* 2 along with this work; if not, write to the Free Software Foundation,
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/* @test
* @bug 4607272 6842687
* @summary Unit test for AsynchronousChannelGroup
*/
import java.nio.ByteBuffer;
import java.nio.channels.*;
import java.net.*;
import java.util.concurrent.*;
import java.io.IOException;
public class Unbounded {
// number of concurrent completion handlers
static final int CONCURRENCY_COUNT = 256;
public static void main(String[] args) throws Exception {
// all accepted connections are added to a queue
final ArrayBlockingQueue<AsynchronousSocketChannel> queue =
new ArrayBlockingQueue<AsynchronousSocketChannel>(CONCURRENCY_COUNT);
// create listener to accept connections
final AsynchronousServerSocketChannel listener =
AsynchronousServerSocketChannel.open()
.bind(new InetSocketAddress(0));
listener.accept((Void)null, new CompletionHandler<AsynchronousSocketChannel,Void>() {
public void completed(AsynchronousSocketChannel ch, Void att) {
queue.add(ch);
listener.accept((Void)null, this);
}
public void failed(Throwable exc, Void att) {
}
});
System.out.println("Listener created.");
// establish lots of connections
int port = ((InetSocketAddress)(listener.getLocalAddress())).getPort();
SocketAddress sa = new InetSocketAddress(InetAddress.getLocalHost(), port);
AsynchronousSocketChannel[] channels =
new AsynchronousSocketChannel[CONCURRENCY_COUNT];
for (int i=0; i<CONCURRENCY_COUNT; i++) {
int attempts = 0;
for (;;) {
try {
channels[i] = AsynchronousSocketChannel.open();
channels[i].connect(sa).get();
break;
} catch (IOException x) {
// probably resource issue so back off and retry
if (++attempts >= 3)
throw x;
Thread.sleep(50);
}
}
}
System.out.println("All connection established.");
// the barrier where all threads (plus the main thread) wait
final CyclicBarrier barrier = new CyclicBarrier(CONCURRENCY_COUNT+1);
// initiate a read operation on each channel.
for (int i=0; i<CONCURRENCY_COUNT; i++) {
ByteBuffer buf = ByteBuffer.allocateDirect(100);
channels[i].read( buf, channels[i],
new CompletionHandler<Integer,AsynchronousSocketChannel>() {
public void completed(Integer bytesRead, AsynchronousSocketChannel ch) {
try {
ch.close();
barrier.await();
} catch (Exception x) {
throw new AssertionError(x);
}
}
public void failed(Throwable exc, AsynchronousSocketChannel ch) {
}
});
}
System.out.println("All read operations outstanding.");
// write data to each of the accepted connections
int remaining = CONCURRENCY_COUNT;
while (remaining > 0) {
AsynchronousSocketChannel ch = queue.take();
ch.write(ByteBuffer.wrap("welcome".getBytes())).get();
ch.close();
remaining--;
}
// wait for all threads to reach the barrier
System.out.println("Waiting for all threads to reach barrier");
barrier.await();
listener.close();
}
}