Examples of org.eclipse.jetty.spdy.api.DataInfo

org.eclipse.jetty.spdy.api.DataInfo

A container for DATA frames metadata and content bytes.

Specialized subclasses (like {@link StringDataInfo}) may be used by applications to send specific types of content.

Applications may send multiple instances of {@link DataInfo}, usually of the same type, via {@link Stream#data(DataInfo)}. The last instance must have the {@link #isClose() close flag} set, so that the client knows that no more content isexpected.

Receivers of {@link DataInfo} via {@link StreamFrameListener#onData(Stream,DataInfo)}have two different APIs to read the data content bytes: a {@link #readInto(ByteBuffer) read}API that does not interact with flow control, and a {@link #consumeInto(ByteBuffer) drain}API that interacts with flow control.

Flow control is defined so that when the sender wants to sends a number of bytes larger than the {@link Settings.ID#INITIAL_WINDOW_SIZE} value, it will stop sending as soon as ithas sent a number of bytes equal to the window size. The receiver has to consume the data bytes that it received in order to tell the sender to send more bytes.

Consuming the data bytes can be done only via {@link #consumeInto(ByteBuffer)} or by a combinationof {@link #readInto(ByteBuffer)} and {@link #consume(int)} (possibly at different times).

    }


    private void testGenerateParse(String content) throws Exception
    {
        int length = content.length();
        DataInfo data = new StringDataInfo(content, true);
        int streamId = 13;
        Generator generator = new Generator(new MappedByteBufferPool(), new StandardCompressionFactory().newCompressor());
        ByteBuffer buffer = generator.data(streamId, 2 * length, data);


        Assert.assertNotNull(buffer);

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    @Test
    public void testGenerateParseOneByteAtATime() throws Exception
    {
        String content = "test2";
        int length = content.length();
        DataInfo data = new StringDataInfo(content, true);
        int streamId = 13;
        Generator generator = new Generator(new MappedByteBufferPool(), new StandardCompressionFactory().newCompressor());
        ByteBuffer buffer = generator.data(streamId, 2 * length, data);


        Assert.assertNotNull(buffer);

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    @Test
    public void testGenerateParseWithSyntheticFrames() throws Exception
    {
        String content = "0123456789ABCDEF";
        int length = content.length();
        DataInfo data = new StringDataInfo(content, true);
        int streamId = 13;
        Generator generator = new Generator(new MappedByteBufferPool(), new StandardCompressionFactory().newCompressor());
        ByteBuffer buffer = generator.data(streamId, 2 * length, data);


        Assert.assertNotNull(buffer);

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        // Send the second chunk of data, must not arrive since we're flow control stalled now
        stream.data(new BytesDataInfo(new byte[size * 2], true), new Callback.Adapter());
        Assert.assertFalse(dataLatch.await(1, TimeUnit.SECONDS));


        // Consume the data arrived to server, this will resume flow control
        DataInfo dataInfo = dataInfoRef.get();
        dataInfo.consume(dataInfo.length());


        Assert.assertTrue(dataLatch.await(5, TimeUnit.SECONDS));
    }

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                    throw new SPDYException(x);
                }
            }
        });


        DataInfo dataInfo = exchanger.exchange(null, 5, TimeUnit.SECONDS);
        checkThatWeAreFlowControlStalled(exchanger);


        Assert.assertEquals(windowSize, dataInfo.available());
        Assert.assertEquals(0, dataInfo.consumed());
        dataInfo.asByteBuffer(true);


        dataInfo = exchanger.exchange(null, 5, TimeUnit.SECONDS);
        checkThatWeAreFlowControlStalled(exchanger);


        Assert.assertEquals(0, dataInfo.available());
        Assert.assertEquals(0, dataInfo.consumed());
        dataInfo.consume(dataInfo.length());


        dataInfo = exchanger.exchange(null, 5, TimeUnit.SECONDS);
        checkThatWeAreFlowControlStalled(exchanger);


        Assert.assertEquals(dataInfo.length() / 2, dataInfo.consumed());
        dataInfo.asByteBuffer(true);


        dataInfo = exchanger.exchange(null, 5, TimeUnit.SECONDS);
        Assert.assertEquals(dataInfo.length(), dataInfo.consumed());
        // Check that we are not flow control stalled
        dataInfo = exchanger.exchange(null, 5, TimeUnit.SECONDS);
        Assert.assertEquals(dataInfo.length(), dataInfo.consumed());
    }

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        Stream stream = session.syn(new SynInfo(5, TimeUnit.SECONDS, new Fields(), false, (byte)0), null);
        final int length = 5 * windowSize;
        stream.data(new BytesDataInfo(new byte[length], true), new Callback.Adapter());


        DataInfo dataInfo = exchanger.exchange(null, 5, TimeUnit.SECONDS);
        checkThatWeAreFlowControlStalled(exchanger);


        Assert.assertEquals(windowSize, dataInfo.available());
        Assert.assertEquals(0, dataInfo.consumed());
        dataInfo.asByteBuffer(true);


        dataInfo = exchanger.exchange(null, 5, TimeUnit.SECONDS);
        checkThatWeAreFlowControlStalled(exchanger);


        Assert.assertEquals(0, dataInfo.available());
        Assert.assertEquals(0, dataInfo.consumed());
        dataInfo.consume(dataInfo.length());


        dataInfo = exchanger.exchange(null, 5, TimeUnit.SECONDS);
        checkThatWeAreFlowControlStalled(exchanger);


        Assert.assertEquals(dataInfo.length() / 2, dataInfo.consumed());
        dataInfo.asByteBuffer(true);


        dataInfo = exchanger.exchange(null, 5, TimeUnit.SECONDS);
        Assert.assertEquals(dataInfo.length(), dataInfo.consumed());
        // Check that we are not flow control stalled
        dataInfo = exchanger.exchange(null, 5, TimeUnit.SECONDS);
        Assert.assertEquals(dataInfo.length(), dataInfo.consumed());
    }

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        session.syn(new SynInfo(5, TimeUnit.SECONDS, new Fields(), true, (byte)0), new StreamFrameListener.Adapter()
        {
            @Override
            public void onData(Stream stream, DataInfo dataInfo)
            {
                DataInfo dataInfo1 = dataInfoRef1.getAndSet(null);
                if (dataInfo1 != null)
                    dataInfo1.consume(dataInfo1.length());
                DataInfo dataInfo2 = dataInfoRef2.getAndSet(null);
                if (dataInfo2 != null)
                    dataInfo2.consume(dataInfo2.length());
                dataInfo.consume(dataInfo.length());
                if (dataInfo.isClose())
                    latch.countDown();
            }
        });

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Related Classes of org.eclipse.jetty.spdy.api.DataInfo

org.eclipse.jetty.spdy.frames.DataGenerateParseTest

org.eclipse.jetty.spdy.server.FlowControlTest

java.nio.ByteBuffer

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