Examples of org.apache.mina.core.buffer.IoBuffer

org.apache.mina.core.buffer.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: 748525 $, $Date: 2009-02-27 14:45:31 +0100 (Fri, 27 Feb 2009) $

        StanzaWriteInfo stanzaWriteInfo = (StanzaWriteInfo) o;


        Stanza element = stanzaWriteInfo.getStanza();
        Renderer renderer = new Renderer(element);


        IoBuffer byteBuffer = IoBuffer.allocate(16).setAutoExpand(true);
        if (stanzaWriteInfo.isWriteProlog()) byteBuffer.putString(StanzaWriter.XML_PROLOG, getSessionEncoder());
        if (stanzaWriteInfo.isWriteOpeningElement()) byteBuffer.putString(renderer.getOpeningElement(), getSessionEncoder());
        if (stanzaWriteInfo.isWriteContent()) byteBuffer.putString(renderer.getElementContent(), getSessionEncoder());
        if (stanzaWriteInfo.isWriteClosingElement()) byteBuffer.putString(renderer.getClosingElement(), getSessionEncoder());


        byteBuffer.flip();
        protocolEncoderOutput.write(byteBuffer);
    }

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            if (State.atEnd(state)) {
                int endPosition = byteBuffer.position();
                if (state == State.END_TEXT) endPosition--;
                int limit = byteBuffer.limit();
                IoBuffer stanzaBuffer = null;
                try {
                    // prepare correct slicing
                    byteBuffer.position(startPosition);
                    byteBuffer.limit(endPosition);
                    stanzaBuffer = byteBuffer.slice();
                } finally {
                    // cut off sliced parts
                    byteBuffer.position(endPosition);
                    byteBuffer.limit(limit);
                }


                String content = stanzaBuffer.getString(charsetDecoder);
                return new XMLParticle(content);
            }
        }
        // no complete stanza found. prepare next read
        byteBuffer.position(startPosition);

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    public long getId() {
        return session.getId();
    }


    public WriteFuture write(byte[] data, int offset, int len) {
        IoBuffer buffer = IoBuffer.wrap(data, offset, len);
        return session.write(buffer);
    }

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    @Test
    public void testAllocate() throws Exception {
        for (int i = 10; i < 1048576 * 2; i = i * 11 / 10) // increase by 10%
        {
            IoBuffer buf = IoBuffer.allocate(i);
            assertEquals(0, buf.position());
            assertEquals(buf.capacity(), buf.remaining());
            assertTrue(buf.capacity() >= i);
            assertTrue(buf.capacity() < i * 2);
        }
    }

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        }
    }


    @Test
    public void testAutoExpand() throws Exception {
        IoBuffer buf = IoBuffer.allocate(1);


        buf.put((byte) 0);
        try {
            buf.put((byte) 0);
            fail("Buffer can't auto expand, with autoExpand property set at false");
        } catch (BufferOverflowException e) {
            // Expected Exception as auto expand property is false
            assertTrue(true);
        }


        buf.setAutoExpand(true);
        buf.put((byte) 0);
        assertEquals(2, buf.position());
        assertEquals(2, buf.limit());
        assertEquals(2, buf.capacity());


        buf.setAutoExpand(false);
        try {
            buf.put(3, (byte) 0);
            fail("Buffer can't auto expand, with autoExpand property set at false");
        } catch (IndexOutOfBoundsException e) {
            // Expected Exception as auto expand property is false
            assertTrue(true);
        }


        buf.setAutoExpand(true);
        buf.put(3, (byte) 0);
        assertEquals(2, buf.position());
        assertEquals(4, buf.limit());
        assertEquals(4, buf.capacity());


        // Make sure the buffer is doubled up.
        buf = IoBuffer.allocate(1).setAutoExpand(true);
        int lastCapacity = buf.capacity();
        for (int i = 0; i < 1048576; i ++) {
            buf.put((byte) 0);
            if (lastCapacity != buf.capacity()) {
                assertEquals(lastCapacity * 2, buf.capacity());
                lastCapacity = buf.capacity();
            }
        }
    }

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public class BufferedWriteFilterTest extends TestCase {
    private final Logger logger = LoggerFactory
            .getLogger(BufferedWriteFilterTest.class);


    public void testNonExpandableBuffer() throws Exception {
        IoBuffer dest = IoBuffer.allocate(1);
        assertEquals(false, dest.isAutoExpand());
    }

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            public void filterWrite(NextFilter nextFilter, IoSession session,
                    WriteRequest writeRequest) throws Exception {
                logger.debug("New buffered message written !");
                counter++;
                try {
                    IoBuffer buf = (IoBuffer) writeRequest.getMessage();
                    if (counter == 3) {
                        assertEquals(1, buf.limit());
                        assertEquals(0, buf.get());
                    } else {
                        assertEquals(10, buf.limit());
                    }
                } catch (Exception ex) {
                    throw new AssertionError("Wrong message type");
                }
            }


        });
        sess.getFilterChain().addFirst("logger", new LoggingFilter());
        BufferedWriteFilter bFilter = new BufferedWriteFilter(10);
        sess.getFilterChain().addLast("buffer", bFilter);


        IoBuffer data = IoBuffer.allocate(1);
        for (byte i = 0; i < 20; i++) {
            data.put((byte) (0x30 + i));
            data.flip();
            sess.write(data);
            data.clear();
        }


        // Add one more byte to overflow the final buffer
        data.put((byte) 0);
        data.flip();
        sess.write(data);
        
        // Flush the final byte
        bFilter.flush(sess);

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    }


    private SocketAddress connectAndWrite(NioSocketConnector connector, int clientNr) {
        ConnectFuture connectFuture = connector.connect(new InetSocketAddress("localhost", port));
        connectFuture.awaitUninterruptibly(TIMEOUT);
        IoBuffer message = IoBuffer.allocate(4).putInt(clientNr).flip();
        IoSession session = connectFuture.getSession();
        session.write(message).awaitUninterruptibly(TIMEOUT);
        return session.getLocalAddress();
    }

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        }
    }


    @Test
    public void testAutoExpandMark() throws Exception {
        IoBuffer buf = IoBuffer.allocate(4).setAutoExpand(true);


        buf.put((byte) 0);
        buf.put((byte) 0);
        buf.put((byte) 0);


        // Position should be 3 when we reset this buffer.
        buf.mark();


        // Overflow it
        buf.put((byte) 0);
        buf.put((byte) 0);


        assertEquals(5, buf.position());
        buf.reset();
        assertEquals(3, buf.position());
    }

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        assertEquals(3, buf.position());
    }


    @Test
    public void testAutoShrink() throws Exception {
        IoBuffer buf = IoBuffer.allocate(8).setAutoShrink(true);


        // Make sure the buffer doesn't shrink too much (less than the initial
        // capacity.)
        buf.sweep((byte) 1);
        buf.fill(7);
        buf.compact();
        assertEquals(8, buf.capacity());
        assertEquals(1, buf.position());
        assertEquals(8, buf.limit());
        buf.clear();
        assertEquals(1, buf.get());


        // Expand the buffer.
        buf.capacity(32).clear();
        assertEquals(32, buf.capacity());


        // Make sure the buffer shrinks when only 1/4 is being used.
        buf.sweep((byte) 1);
        buf.fill(24);
        buf.compact();
        assertEquals(16, buf.capacity());
        assertEquals(8, buf.position());
        assertEquals(16, buf.limit());
        buf.clear();
        for (int i = 0; i < 8; i ++) {
            assertEquals(1, buf.get());
        }


        // Expand the buffer.
        buf.capacity(32).clear();
        assertEquals(32, buf.capacity());


        // Make sure the buffer shrinks when only 1/8 is being used.
        buf.sweep((byte) 1);
        buf.fill(28);
        buf.compact();
        assertEquals(8, buf.capacity());
        assertEquals(4, buf.position());
        assertEquals(8, buf.limit());
        buf.clear();
        for (int i = 0; i < 4; i ++) {
            assertEquals(1, buf.get());
        }


        // Expand the buffer.
        buf.capacity(32).clear();
        assertEquals(32, buf.capacity());


        // Make sure the buffer shrinks when 0 byte is being used.
        buf.fill(32);
        buf.compact();
        assertEquals(8, buf.capacity());
        assertEquals(0, buf.position());
        assertEquals(8, buf.limit());


        // Expand the buffer.
        buf.capacity(32).clear();
        assertEquals(32, buf.capacity());


        // Make sure the buffer doesn't shrink when more than 1/4 is being used.
        buf.sweep((byte) 1);
        buf.fill(23);
        buf.compact();
        assertEquals(32, buf.capacity());
        assertEquals(9, buf.position());
        assertEquals(32, buf.limit());
        buf.clear();
        for (int i = 0; i < 9; i ++) {
            assertEquals(1, buf.get());
        }
    }

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Examples of org.apache.mina.core.buffer.IoBuffer

Wrapping existing NIO buffers and arrays

AutoExpand

AutoShrink

Derived Buffers

Changing Buffer Allocation Policy

Related Classes of org.apache.mina.core.buffer.IoBuffer