Examples of org.apache.mina.common.IoBuffer

org.apache.mina.common.IoBuffer
cate heap buffer by default. IoBuffer.setUseDirectBuffer(false); // A new heap buffer is returned. IoBuffer buf = IoBuffer.allocate(1024);

Wrapping existing NIO buffers and arrays

This class provides a few wrap(...) methods that wraps any NIO buffers and byte arrays.
AutoExpand

Writing variable-length data using NIO ByteBuffers is not really easy, and it is because its size is fixed. {@link IoBuffer} introduces autoExpand property. If autoExpand property is true, you never get {@link BufferOverflowException} or{@link IndexOutOfBoundsException} (except when index is negative).It automatically expands its capacity and limit value. For example:
```
 String greeting = messageBundle.getMessage( "hello" ); IoBuffer buf = IoBuffer.allocate( 16 ); // Turn on autoExpand (it is off by default) buf.setAutoExpand( true ); buf.putString( greeting, utf8encoder ); 
```
The underlying {@link ByteBuffer} is reallocated by {@link IoBuffer} behindthe scene if the encoded data is larger than 16 bytes in the example above. Its capacity will double, and its limit will increase to the last position the string is written.

AutoShrink

You might also want to decrease the capacity of the buffer when most of the allocated memory area is not being used. {@link IoBuffer} providesautoShrink property to take care of this issue. If autoShrink is turned on, {@link IoBuffer} halves the capacityof the buffer when {@link #compact()} is invoked and only 1/4 or less ofthe current capacity is being used.
You can also {@link #shrink()} method manually to shrink the capacity ofthe buffer.
The underlying {@link ByteBuffer} is reallocated by {@link IoBuffer} behindthe scene, and therefore {@link #buf()} will return a different{@link ByteBuffer} instance once capacity changes. Please also note{@link #compact()} or {@link #shrink()} will not decrease the capacity ifthe new capacity is less than the {@link #minimumCapacity()} of the buffer.
Derived Buffers

Derived buffers are the buffers which were created by {@link #duplicate()}, {@link #slice()}, or {@link #asReadOnlyBuffer()}. They are useful especially when you broadcast the same messages to multiple {@link IoSession}s. Please note that the buffer derived from and its derived buffers are not both auto-expandable neither auto-shrinkable. Trying to call {@link #setAutoExpand(boolean)} or {@link #setAutoShrink(boolean)}with true parameter will raise an {@link IllegalStateException}.

Changing Buffer Allocation Policy

{@link IoBufferAllocator} interface lets you override the default buffermanagement behavior. There are two allocators provided out-of-the-box:
- {@link SimpleBufferAllocator} (default)
- {@link CachedBufferAllocator}
You can implement your own allocator and use it by calling {@link #setAllocator(IoBufferAllocator)}.
@author The Apache MINA Project (dev@mina.apache.org) @version $Rev: 637706 $, $Date: 2008-03-17 12:18:43 +0900 (월, 17 3월 2008) $

        }
    }


    public DecodingState finishDecode(ProtocolDecoderOutput out)
            throws Exception {
        IoBuffer product;
        // When input contained only terminator rather than actual data...
        if (buffer == null) {
            product = IoBuffer.allocate(0);
        } else {
            product = buffer.flip();

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        // increase the count to as many as required to generate a long
        // string for input
        for (int i = 0; i < 10; i++) {
            strInput += "The quick brown fox jumps over the lazy dog.  ";
        }
        IoBuffer byteInput = IoBuffer.wrap(strInput.getBytes("UTF8"));


        // increase the count to have the compression and decompression
        // done using the same instance of Zlib
        for (int i = 0; i < 5; i++) {
            IoBuffer byteCompressed = deflater.deflate(byteInput);
            IoBuffer byteUncompressed = inflater.inflate(byteCompressed);
            String strOutput = byteUncompressed.getString(Charset.forName(
                    "UTF8").newDecoder());
            assertTrue(strOutput.equals(strInput));
        }
    }

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        }
    }


    public void testCorruptedData() throws Exception {
        String strInput = "Hello World";
        IoBuffer byteInput = IoBuffer.wrap(strInput.getBytes("UTF8"));


        IoBuffer byteCompressed = deflater.deflate(byteInput);
        // change the contents to something else. Since this doesn't check
        // for integrity, it wont throw an exception
        byteCompressed.put(5, (byte) 0xa);
        IoBuffer byteUncompressed = inflater.inflate(byteCompressed);
        String strOutput = byteUncompressed.getString(Charset.forName("UTF8")
                .newDecoder());
        assertFalse(strOutput.equals(strInput));
    }

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        assertFalse(strOutput.equals(strInput));
    }


    public void testCorruptedHeader() throws Exception {
        String strInput = "Hello World";
        IoBuffer byteInput = IoBuffer.wrap(strInput.getBytes("UTF8"));


        IoBuffer byteCompressed = deflater.deflate(byteInput);
        // write a bad value into the zlib header. Make sure that
        // the decompression fails
        byteCompressed.put(0, (byte) 0xca);
        try {
            inflater.inflate(byteCompressed);
        } catch (IOException e) {
            assertTrue(true);
            return;

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    public void testFragments() throws Exception {
        String strInput = "";
        for (int i = 0; i < 10; i++) {
            strInput += "The quick brown fox jumps over the lazy dog.  ";
        }
        IoBuffer byteInput = IoBuffer.wrap(strInput.getBytes("UTF8"));
        IoBuffer byteCompressed = null;


        for (int i = 0; i < 5; i++) {
            byteCompressed = deflater.deflate(byteInput);
            if (i == 0) {
                // decompress the first compressed output since it contains
                // the zlib header, which will not be generated for further
                // compressions done with the same instance
                IoBuffer byteUncompressed = inflater.inflate(byteCompressed);
                String strOutput = byteUncompressed.getString(Charset.forName(
                        "UTF8").newDecoder());
                assertTrue(strOutput.equals(strInput));
            }
        }
        // check if the last compressed data block can be decompressed
        // successfully.
        IoBuffer byteUncompressed = inflater.inflate(byteCompressed);
        String strOutput = byteUncompressed.getString(Charset.forName("UTF8")
                .newDecoder());
        assertTrue(strOutput.equals(strInput));
    }

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        actualInflater = new Zlib(Zlib.COMPRESSION_MAX, Zlib.MODE_INFLATER);
    }


    public void testCompression() throws Exception {
        // prepare the input data
        IoBuffer buf = IoBuffer.wrap(strCompress.getBytes("UTF8"));
        IoBuffer actualOutput = actualDeflater.deflate(buf);
        WriteRequest writeRequest = new DefaultWriteRequest(buf);


        // record all the mock calls
        ioFilterChain.contains(CompressionFilter.class);
        mockIoFilterChain.setReturnValue(false);

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        assertTrue(true);
    }


    public void testDecompression() throws Exception {
        // prepare the input data
        IoBuffer buf = IoBuffer.wrap(strCompress.getBytes("UTF8"));
        IoBuffer byteInput = actualDeflater.deflate(buf);
        IoBuffer actualOutput = actualInflater.inflate(byteInput);


        // record all the mock calls
        ioFilterChain.contains(CompressionFilter.class);
        mockIoFilterChain.setReturnValue(false);

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        protected boolean argumentMatches(Object arg0, Object arg1) {
            // we need to only verify the ByteBuffer output
            if (arg0 instanceof WriteRequest) {
                WriteRequest expected = (WriteRequest) arg0;
                WriteRequest actual = (WriteRequest) arg1;
                IoBuffer bExpected = (IoBuffer) expected.getMessage();
                IoBuffer bActual = (IoBuffer) actual.getMessage();
                return bExpected.equals(bActual);
            }
            return true;
        }

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        }
    }


    @Override
    public void messageReceived(IoSession session, Object message) {
        IoBuffer buf = (IoBuffer) message;
        // Print out read buffer content.
        while (buf.hasRemaining()) {
            System.out.print((char) buf.get());
        }
        System.out.flush();
    }

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    @Override
    public void messageReceived(IoSession session, Object message)
            throws Exception {


        if (message instanceof IoBuffer) {
            IoBuffer buffer = (IoBuffer) message;
            SocketAddress remoteAddress = session.getRemoteAddress();
            server.recvUpdate(remoteAddress, buffer.getLong());
        }
    }

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Examples of org.apache.mina.common.IoBuffer

Wrapping existing NIO buffers and arrays

AutoExpand

AutoShrink

Derived Buffers

Changing Buffer Allocation Policy

Related Classes of org.apache.mina.common.IoBuffer