[classlib][LUNI | NIO] How to write stable tests for blocking write/read operations of Socket and SocketChannel

[Andrew Zhang]

Hi everybody,

I'm struggling to write a stable test for blocking write/read operation of
Socket and SocketChannel.

Could you anybody help me out?


On 6/23/06, Andrew Zhang <[EMAIL PROTECTED]> wrote:

 Hi Alexander,

Thanks for your kind reminder.

Certainly I'll use sth. like Support_PortManager.getNextPort() to avoid
such port conflict issue.

Here I just want to describe the problem.

The test still fails on my machine sometimes.  Could anyone tell me how to
write a stable test on this issue?

Or is it a bug of RI? Or is it possible to write a theoretically stable
test?

Thanks a lot in advance!

     public void test_SocketChannel_BlockWriteRead() throws IOException {
        final int CAPACITY_NORMAL = 200;
        InetSocketAddress localAddr1 = new InetSocketAddress("127.0.0.1
",1234);

        ServerSocket server = new ServerSocket(1234);

        SocketChannel channel = SocketChannel.open();
        channel.connect(localAddr1);
        Socket client = server.accept ();
        client.setTcpNoDelay(true);
        client.setSendBufferSize(1);

        OutputStream out = client.getOutputStream();

        byte[] sendBuf = new byte[CAPACITY_NORMAL * 2];
        for (int i = 0; i < CAPACITY_NORMAL * 2; i++) {
            sendBuf[i] = (byte) i;
        }
        // send CAPACITY_NORMAL * 2 bytes data
        out.write(sendBuf);
        out.flush();

        // no matter out.close() or client.shutdownOutput () is used
        // the test still fails sometimes.
        // out.close();
        client.shutdownOutput();


        ByteBuffer buf1 = ByteBuffer.allocate(CAPACITY_NORMAL);
        ByteBuffer buf2 = ByteBuffer.allocate(CAPACITY_NORMAL);
        ByteBuffer[] buf ={buf1, buf2};

        // should receive CAPACITY_NORMAL * 2 bytes data
        long count = 0;
        do{
            long ret = channel.read(buf);
            if(ret == -1){
                break;
            }
            count += ret;
        }while(count < CAPACITY_NORMAL*2);
        assertEquals(CAPACITY_NORMAL * 2, count);
    }


 On 6/23/06, Alexander Kleymenov <[EMAIL PROTECTED]> wrote:
>
> Hello Andrew,
>
> I ran the test on RI (1.4.2_04-b05 and 1.5.0-b64)  and could not
> reproduce the failure. Is it still an issue?
>
> Can I suggest a little improvement for your test? Try do not use
> hardcoded port numbers in the test.
> Let the ServerSocket choose the available port by specifying 0 as
> parameter.
> I.e. write the test as:
>
>       ServerSocket server = new ServerSocket(0);
>       InetSocketAddress localAddr1 = new InetSocketAddress("127.0.0.1",
>               server.getLocalPort());
>
> Such a way prevents the test from "Address in use" exception.
>
> Thank You,
> Alexander
>
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--
Andrew Zhang
China Software Development Lab, IBM

--
Andrew Zhang
China Software Development Lab, IBM