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) $

   */
  @Test
  public void testFragmented() throws CharacterCodingException {
    final int maxLen = 100;


    IoBuffer savedBuf = IoBuffer.allocate(maxLen);


    String origMsg = "<1>- - blah blam foo\n";
    IoBuffer buf1 = IoBuffer.wrap(
        origMsg.substring(0, 11).getBytes(Charsets.UTF_8));
    IoBuffer buf2 = IoBuffer.wrap(
        origMsg.substring(11, 16).getBytes(Charsets.UTF_8));
    IoBuffer buf3 = IoBuffer.wrap(
        origMsg.substring(16, 21).getBytes(Charsets.UTF_8));


    LineSplitter lineSplitter = new LineSplitter(maxLen);
    ParsedBuffer parsedLine = new ParsedBuffer();

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    String dangerousChars = "þÿÀÁ";


    ///////////////////////////////////////////////////////
    // encode and send them through the message handler
    String msg;
    IoBuffer buf;
    Event evt;


    // valid ISO-8859-1 on the right (ISO-8859-1) port
    msg = header + dangerousChars + "\n";
    buf = IoBuffer.wrap(msg.getBytes(Charsets.ISO_8859_1));

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        this.charset = charset;
        this.delimiter = delimiter;
        
        // Convert delimiter to ByteBuffer if not done yet.
        if (delimBuf == null) {
            IoBuffer tmp = IoBuffer.allocate(2).setAutoExpand(true);
            
            try{
                tmp.putString(delimiter.getValue(), charset.newEncoder());
            } catch (CharacterCodingException cce) {
                
            }
            
            tmp.flip();
            delimBuf = tmp;
        }
    }

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                in.limit(oldLimit);
                in.position(pos);


                if (ctx.getOverflowPosition() == 0) {
                    IoBuffer buf = ctx.getBuffer();
                    buf.flip();
                    buf.limit(buf.limit() - matchCount);
                    
                    try {
                        writeText(session, buf.getString(ctx.getDecoder()), out);
                    } finally {
                        buf.clear();
                    }
                } else {
                    int overflowPosition = ctx.getOverflowPosition();
                    ctx.reset();
                    throw new RecoverableProtocolDecoderException(

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                    in.limit(oldLimit);
                    in.position(pos);
                    
                    if (ctx.getOverflowPosition() == 0) {
                        IoBuffer buf = ctx.getBuffer();
                        buf.flip();
                        buf.limit(buf.limit() - matchCount);
                        
                        try {
                            writeText(session, buf.getString(ctx.getDecoder()), out);
                        } finally {
                            buf.clear();
                        }
                    } else {
                        int overflowPosition = ctx.getOverflowPosition();
                        ctx.reset();
                        throw new RecoverableProtocolDecoderException(

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     * the request context into a BOSH requests.
     * @throws IOException
     * @throws SAXException
     */
    public void decode() throws IOException, SAXException {
        IoBuffer ioBuf = IoBuffer.allocate(1024);
        ioBuf.setAutoExpand(true);
        byte[] buf = new byte[1024];
        InputStream in = request.getInputStream();


        for (;;) {
            int i = in.read(buf);
            if (i == -1) {
                break;
            }
            ioBuf.put(buf, 0, i);
        }
        ioBuf.flip();
        reader.parse(ioBuf, CharsetUtil.UTF8_DECODER);
    }

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  private XMLParticle decode(IoBuffer bb) throws Exception {
    return ParticleDecoder.decodeParticle(bb, CharsetUtil.UTF8_DECODER);
  }


  private List<XMLParticle> decodeAll(String xml) throws Exception {
    IoBuffer bb = wrap(xml);
    List<XMLParticle> particles = new ArrayList<XMLParticle>();
    
    XMLParticle particle = decode(bb);
    while(particle != null) {
      particles.add(particle);

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    private static final CharsetEncoder CHARSET_ENCODER_UTF8 = CharsetUtil.UTF8_ENCODER;


    public void testDecoderSimple() throws Exception {
        XMLStreamTokenizer decoder = new XMLStreamTokenizer();
        MockIoSession session = new MockIoSession();
        IoBuffer firstByteBuffer = createByteBuffer();
        IoBuffer secondByteBuffer = createByteBuffer();
        
        String stanza = StanzaWriter.XML_PROLOG + "\n\r" + 
                "<stream:stream to='example.com' xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' version='1.0'>" +
                "<trailing-stanza/>";


        firstByteBuffer.putString(stanza, CHARSET_ENCODER_UTF8).flip();
        
        MockProtocolDecoderOutput protocolDecoderOutput = new MockProtocolDecoderOutput();
        decoder.decode(session, firstByteBuffer, protocolDecoderOutput);
        assertEquals(4, protocolDecoderOutput.size());
        
        secondByteBuffer.putString("<next></next>", CHARSET_ENCODER_UTF8).flip();
        
        decoder.decode(session, secondByteBuffer, protocolDecoderOutput);
        assertEquals(5, protocolDecoderOutput.size());


        IoBuffer emptyBuffer = createByteBuffer().putString("eee", CHARSET_ENCODER_UTF8).flip();
        decoder.decode(session, emptyBuffer, protocolDecoderOutput);
        assertEquals("plain must be terminated by <", 5, protocolDecoderOutput.size());
        
        IoBuffer termBuffer = createByteBuffer().putString("<r>", CHARSET_ENCODER_UTF8).flip();
        decoder.decode(session, termBuffer, protocolDecoderOutput);
        // eee is now terminated, but r is not balanced yet
        assertEquals("plain termination", 6, protocolDecoderOutput.size());
        
    }

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    }


    public void testDecoderPartial() throws Exception {
        XMLStreamTokenizer decoder = new XMLStreamTokenizer();
        MockIoSession session = new MockIoSession();
        IoBuffer firstByteBuffer = createByteBuffer();
        IoBuffer secondByteBuffer = createByteBuffer();
        
        String stanzaPart1 = "<stream:stream to='example.com' xmlns='jabber:client' xmlns:stream='ht";
        String stanzaPart2 = "tp://etherx.jabber.org/streams' version='1.0'>";


        MockProtocolDecoderOutput protocolDecoderOutput = new MockProtocolDecoderOutput();


        IoBuffer prolog = createByteBuffer();
        prolog.putString(StanzaWriter.XML_PROLOG + "\n\r", CHARSET_ENCODER_UTF8).flip();
        decoder.decode(session, prolog, protocolDecoderOutput);
        assertEquals(1, protocolDecoderOutput.size());
        
        firstByteBuffer.putString(stanzaPart1, CHARSET_ENCODER_UTF8).flip();
        decoder.decode(session, firstByteBuffer, protocolDecoderOutput);

View Full Code Here

    }


    public void testCRLFInElement() throws Exception {
        XMLStreamTokenizer decoder = new XMLStreamTokenizer();
        MockIoSession session = new MockIoSession();
        IoBuffer byteBuffer = createByteBuffer();
        
        String stanza = 
        "<stream:stream\n" +
                "     from='juliet@example.com'\n" +
                "     to='example.com'\n" +
                "     version='1.0'\n" +
                "     xml:lang='en'\n" +
                "     xmlns='jabber:client'\n" +
                "     xmlns:stream='http://etherx.jabber.org/streams'>";
        
        MockProtocolDecoderOutput protocolDecoderOutput = new MockProtocolDecoderOutput();


        byteBuffer.putString(stanza, CHARSET_ENCODER_UTF8).flip();
        try {
            decoder.decode(session, byteBuffer, protocolDecoderOutput);
        } catch(Throwable th) {
            int lkjl = 0;
        }

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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