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) $

        for (Object b : messageQueue) {
            sum += ((IoBuffer) b).remaining();
        }


        // Allocate a new BB that will contain all fragments
        IoBuffer newBuf = IoBuffer.allocate(sum);


        // and merge all.
        for (; ;) {
            IoBuffer buf = (IoBuffer) messageQueue.poll();
            if (buf == null) {
                break;
            }


            newBuf.put(buf);

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        if (!(message instanceof IoBuffer)) {
            nextFilter.messageReceived(session, message);
            return;
        }


        IoBuffer in = (IoBuffer) message;
        ProtocolDecoder decoder = getDecoder0(session);
        ProtocolDecoderOutput decoderOut = getDecoderOut(session, nextFilter);


        while (in.hasRemaining()) {
            int oldPos = in.position();
            try {
                synchronized (decoderOut) {
                    decoder.decode(session, in, decoderOut);
                }
                // Finish decoding if no exception was thrown.
                decoderOut.flush();
                break;
            } catch (Throwable t) {
                ProtocolDecoderException pde;
                if (t instanceof ProtocolDecoderException) {
                    pde = (ProtocolDecoderException) t;
                } else {
                    pde = new ProtocolDecoderException(t);
                }
                pde.setHexdump(in.getHexDump());


                // Fire the exceptionCaught event.
                decoderOut.flush();
                nextFilter.exceptionCaught(session, pde);


                // Retry only if the type of the caught exception is
                // recoverable and the buffer position has changed.
                // We check buffer position additionally to prevent an
                // infinite loop.
                if (!(t instanceof RecoverableProtocolDecoderException) ||
                        in.position() == oldPos) {
                    break;
                }
            }
        }
    }

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            throws Exception {
        if (buffer == null) {
            if (in.remaining() >= length) {
                int limit = in.limit();
                in.limit(in.position() + length);
                IoBuffer product = in.slice();
                in.position(in.position() + length);
                in.limit(limit);
                return finishDecode(product, out);
            } else {
                buffer = IoBuffer.allocate(length);
                buffer.put(in);
                return this;
            }
        } else {
            if (in.remaining() >= length - buffer.position()) {
                int limit = in.limit();
                in.limit(in.position() + length - buffer.position());
                buffer.put(in);
                in.limit(limit);
                IoBuffer product = this.buffer;
                this.buffer = null;
                return finishDecode(product.flip(), out);
            } else {
                buffer.put(in);
                return this;
            }
        }

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        }
    }


    public DecodingState finishDecode(ProtocolDecoderOutput out)
            throws Exception {
        IoBuffer readData;
        if (buffer == null) {
            readData = IoBuffer.allocate(0);
        } else {
            readData = buffer.flip();
            buffer = null;

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        if (!(message instanceof IoBuffer)) {
            nextFilter.messageReceived(session, message);
            return;
        }


        IoBuffer in = (IoBuffer) message;
        ProtocolDecoder decoder = getDecoder0(session);
        ProtocolDecoderOutput decoderOut = getDecoderOut(session, nextFilter);


        while (in.hasRemaining()) {
            int oldPos = in.position();
            try {
                synchronized (decoderOut) {
                    decoder.decode(session, in, decoderOut);
                }
                // Finish decoding if no exception was thrown.
                decoderOut.flush();
                break;
            } catch (Throwable t) {
                ProtocolDecoderException pde;
                if (t instanceof ProtocolDecoderException) {
                    pde = (ProtocolDecoderException) t;
                } else {
                    pde = new ProtocolDecoderException(t);
                }
                pde.setHexdump(in.getHexDump());


                // Fire the exceptionCaught event.
                decoderOut.flush();
                nextFilter.exceptionCaught(session, pde);


                // Retry only if the type of the caught exception is
                // recoverable and the buffer position has changed.
                // We check buffer position additionally to prevent an
                // infinite loop.
                if (!(t instanceof RecoverableProtocolDecoderException) ||
                        in.position() == oldPos) {
                    break;
                }
            }
        }
    }

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            throws Exception {
        int terminatorPos = in.indexOf(terminator);


        if (terminatorPos >= 0) {
            int limit = in.limit();
            IoBuffer product;


            if (in.position() < terminatorPos) {
                in.limit(terminatorPos);


                if (buffer == null) {

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        }
    }


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


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

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        int matchCount = ctx.getMatchCount();


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


        // Try to find a match
        int oldPos = in.position();
        int oldLimit = in.limit();
        while (in.hasRemaining()) {
            byte b = in.get();
            if (delimBuf.get(matchCount) == b) {
                matchCount++;
                if (matchCount == delimBuf.limit()) {
                    // Found a match.
                    int pos = in.position();
                    in.limit(pos);
                    in.position(oldPos);


                    ctx.append(in);


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

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        public WriteFuture flush() {
            Queue<IoBuffer> bufferQueue = getBufferQueue();
            WriteFuture future = null;
            for (;;) {
                IoBuffer buf = bufferQueue.poll();
                if (buf == null) {
                    break;
                }


                // Flush only when the buffer has remaining.
                if (buf.hasRemaining()) {
                    future = new DefaultWriteFuture(session);
                    nextFilter.filterWrite(session, new EncodedWriteRequest(buf,
                            future, writeRequest.getDestination()));
                }
            }

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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