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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
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/* @test
* @bug 4607272 6999915 7185340
* @summary Unit test for AsynchronousSocketChannel
* @run main/othervm -XX:+DisableExplicitGC -XX:MaxDirectMemorySize=75m Leaky
*/
import java.nio.ByteBuffer;
import java.nio.channels.*;
import java.net.*;
import java.util.List;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
import java.lang.management.BufferPoolMXBean;
import java.lang.management.ManagementFactory;
/**
* Heap buffers must be substituted with direct buffers when doing I/O. This
* test creates a scenario on Windows that challenges the per-thread buffer
* cache and quickly leads to an OutOfMemoryError if temporary buffers are
* not returned to the native heap.
*/
public class Leaky {
static final int K = 1024;
static class Connection {
private final AsynchronousSocketChannel client;
private final SocketChannel peer;
private final ByteBuffer dst;
private Future<Integer> readResult;
Connection(AsynchronousChannelGroup group) throws Exception {
ServerSocketChannel ssc =
ServerSocketChannel.open().bind(new InetSocketAddress(0));
InetAddress lh = InetAddress.getLocalHost();
int port = ((InetSocketAddress)(ssc.getLocalAddress())).getPort();
SocketAddress remote = new InetSocketAddress(lh, port);
client = AsynchronousSocketChannel.open(group);
client.connect(remote).get();
peer = ssc.accept();
ssc.close();
dst = ByteBuffer.allocate(K*K);
}
void startRead() {
dst.clear();
readResult = client.read(dst);
}
void write() throws Exception {
peer.write(ByteBuffer.wrap("X".getBytes()));
}
void finishRead() throws Exception {
readResult.get();
}
}
public static void main(String[] args) throws Exception {
ThreadFactory threadFactory = new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
Thread t = new Thread(r);
t.setDaemon(true);
return t;
}
};
AsynchronousChannelGroup group =
AsynchronousChannelGroup.withFixedThreadPool(4, threadFactory);
final int CONNECTION_COUNT = 10;
Connection[] connections = new Connection[CONNECTION_COUNT];
for (int i=0; i<CONNECTION_COUNT; i++) {
connections[i] = new Connection(group);
}
for (int i=0; i<1024; i++) {
// initiate reads
for (Connection conn: connections) {
conn.startRead();
}
// write data so that the read can complete
for (Connection conn: connections) {
conn.write();
}
// complete read
for (Connection conn: connections) {
conn.finishRead();
}
}
// print summary of buffer pool usage
List<BufferPoolMXBean> pools =
ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class);
for (BufferPoolMXBean pool: pools)
System.out.format(" %8s ", pool.getName());
System.out.println();
for (int i=0; i<pools.size(); i++)
System.out.format("%6s %10s %10s ", "Count", "Capacity", "Memory");
System.out.println();
for (BufferPoolMXBean pool: pools) {
System.out.format("%6d %10d %10d ",
pool.getCount(), pool.getTotalCapacity(), pool.getMemoryUsed());
}
System.out.println();
}
}