Examples of org.jgroups.util.BlockingInputStream

org.jgroups.util.BlockingInputStream
Bounded input stream. A consumer reads bytes until the end of the stream is reached, or the input stream is closed. The producer writes bytes to the tail and blocks if the capacity has been reached (until the consumer reads more bytes).
This class is for only 1 producer and 1 consumer; multiple producers/consumers will most likely yield incorrect results !
Note that the implementation of this class is optimized for reading and adding a few K at a time; performance will be suboptimal if single bytes are added and read. @author Bela Ban @since 2.12.2

        getStateFromApplication(requester, bos, false);
    }


    protected Tuple<InputStream,Object> createStreamToProvider(final Address provider, final StateHeader hdr) {
        Util.close(input_stream);
        input_stream=new BlockingInputStream(buffer_size);
        return new Tuple<InputStream,Object>(input_stream, null);
    }

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    }


    
    protected void createStreamToProvider(final Address provider, final StateHeader hdr) {
        Util.close(input_stream);
        input_stream=new BlockingInputStream(buffer_size);


        // use another thread to read state because the state requester has to receive state chunks from the state provider
        Thread t=getThreadFactory().newThread(new Runnable() {
            public void run() {
                setStateInApplication(provider, input_stream, hdr.getDigest());

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@Test(groups=Global.FUNCTIONAL,sequential=false)
public class BlockingInputStreamTest {


    
    public void testCreation() throws IOException {
        BlockingInputStream in=new BlockingInputStream(2000);
        System.out.println("in = " + in);
        assert in.available() == 0 && in.capacity() == 2000;


        in.write(new byte[]{'b', 'e', 'l', 'a'});
        System.out.println("in = " + in);
        assert in.available() == 4 && in.capacity() == 2000;
    }

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        assert in.available() == 4 && in.capacity() == 2000;
    }




    public void testRead() throws IOException {
        final BlockingInputStream in=new BlockingInputStream(100);
        byte[] input={'B', 'e', 'l', 'a'};
        in.write(input);
        in.close();


        assert in.available() == 4;
        for(int i=0; i < input.length; i++) {
            int b=in.read();
            assert b == input[i];
        }
        int b=in.read();
        assert b == -1;
    }

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        assert b == -1;
    }




    public void testBlockingReadAndClose() throws IOException {
        final BlockingInputStream in=new BlockingInputStream(100);
        final CountDownLatch latch=new CountDownLatch(1);
        byte[] buf=new byte[100];
        
        new Closer(latch, in, 1000L).start(); // closes input stream after 1 sec
        latch.countDown();
        int num=in.read(buf, 0, buf.length);
        assert num == -1 : " expected -1 (EOF) but got " + num;
    }

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        assert num == -1 : " expected -1 (EOF) but got " + num;
    }


    
    public void testBlockingWriteAndClose() throws IOException {
        final BlockingInputStream in=new BlockingInputStream(3);
        final CountDownLatch latch=new CountDownLatch(1);
        byte[] buf={'B', 'e', 'l', 'a'};


        new Closer(latch, in, 1000L).start(); // closes input stream after 1 sec
        latch.countDown();
        in.write(buf, 0, buf.length);
    }

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        in.write(buf, 0, buf.length);
    }




    public void testReadOnClosedInputStream() throws IOException {
        final BlockingInputStream in=new BlockingInputStream(100);
        in.close();
        byte[] buf=new byte[100];
        int num=in.read(buf, 0, buf.length);
        assert num == -1 : " expected -1 (EOF) but got " + num;
    }

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        assert num == -1 : " expected -1 (EOF) but got " + num;
    }


    
    public void testWriteCloseRead() throws IOException {
        final BlockingInputStream in=new BlockingInputStream(100);
        for(int i=1; i <= 5; i++) {
            byte[] buf=("Hello world " + i).getBytes();
            in.write(buf);
        }
        in.close();


        int size=in.available();
        byte[] buf=new byte[100];
        int num=in.read(buf);
        assert num == size;
    }

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        assert num == size;
    }




    public void testWriteCloseRead2() throws IOException {
        final BlockingInputStream in=new BlockingInputStream(100);
        StringBuilder sb=new StringBuilder();
        for(int i=1; i <=10; i++)
            sb.append("Hello world " + i);
        byte[] buffer=sb.toString().getBytes();
        new Writer(in, buffer).start();
        Util.sleep(500);


        byte[] buf=new byte[200];
        int num=in.read(buf);
        assert num == buffer.length;
    }

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        int num=in.read(buf);
        assert num == buffer.length;
    }


    public void testWriteCloseRead3() throws IOException {
        final BlockingInputStream in=new BlockingInputStream(300);
        StringBuilder sb=new StringBuilder();
        for(int i=1; i <=10; i++)
            sb.append("Hello world " + i);
        byte[] buffer=sb.toString().getBytes();
        new Writer(in, buffer).execute(); // don't use a separate thread


        byte[] buf=new byte[200];
        int num=in.read(buf);
        assert num == buffer.length;
    }

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