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) $

     * Get encrypted data to be sent.
     *
     * @return buffer with data
     */
    public IoBuffer fetchOutNetBuffer() {
        IoBuffer answer = outNetBuffer;
        if (answer == null) {
            return emptyBuffer;
        }


        outNetBuffer = null;
        return answer.shrink();
    }

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        // write net data
        WriteFuture writeFuture = null;


        try {
            IoBuffer writeBuffer = fetchOutNetBuffer();
            writeFuture = new DefaultWriteFuture(session);
            parent.filterWrite(nextFilter, session, new DefaultWriteRequest(
                    writeBuffer, writeFuture));


            // loop while more writes required to complete handshake
            while (needToCompleteHandshake()) {
                try {
                    handshake(nextFilter);
                } catch (SSLException ssle) {
                    SSLException newSsle = new SSLHandshakeException(
                            "SSL handshake failed.");
                    newSsle.initCause(ssle);
                    throw newSsle;
                }


                IoBuffer outNetBuffer = fetchOutNetBuffer();
                if (outNetBuffer != null && outNetBuffer.hasRemaining()) {
                    writeFuture = new DefaultWriteFuture(session);
                    parent.filterWrite(nextFilter, session,
                            new DefaultWriteRequest(outNetBuffer, writeFuture));
                }
            }

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     *
     * @param src the buffer to copy
     * @return the new buffer, ready to read from
     */
    public static IoBuffer copy(ByteBuffer src) {
        IoBuffer copy = IoBuffer.allocate(src.remaining());
        copy.put(src);
        copy.flip();
        return copy;
    }

View Full Code Here

        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);
                }
                
                if (pde.getHexdump() == null) {
                    int curPos = in.position();
                    in.position(oldPos);
                    pde.setHexdump(in.getHexDump());
                    in.position(curPos);
                }


                // 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) {

View Full Code Here

        }
    }


    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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            "You have to create one per session.");
        }


        undecodedBuffers.offer(in);
        for (;;) {
            IoBuffer b = undecodedBuffers.peek();
            if (b == null) {
                break;
            }


            int oldRemaining = b.remaining();
            state.decode(b, out);
            int newRemaining = b.remaining();
            if (newRemaining != 0) {
                if (oldRemaining == newRemaining) {
                    throw new IllegalStateException(
                            DecodingState.class.getSimpleName() + " must " +
                            "consume at least one byte per decode().");

View Full Code Here

                lastIsCR = false;
            }
        }


        if (terminatorPos >= 0) {
            IoBuffer product;


            int endPos = terminatorPos - 1;


            if (beginPos < endPos) {
                in.limit(endPos);

View Full Code Here

            return this;
        }
    }


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

View Full Code Here

            doDecode(session, in, out);
            return;
        }


        boolean usingSessionBuffer = true;
        IoBuffer buf = (IoBuffer) session.getAttribute(BUFFER);
        // If we have a session buffer, append data to that; otherwise
        // use the buffer read from the network directly.
        if (buf != null) {
            boolean appended = false;
            // Make sure that the buffer is auto-expanded.
            if (buf.isAutoExpand()) {
                try {
                    buf.put(in);
                    appended = true;
                } catch (IllegalStateException e) {
                    // A user called derivation method (e.g. slice()),
                    // which disables auto-expansion of the parent buffer.
                } catch (IndexOutOfBoundsException e) {
                    // A user disabled auto-expansion.
                }
            }


            if (appended) {
                buf.flip();
            } else {
                // Reallocate the buffer if append operation failed due to
                // derivation or disabled auto-expansion.
                buf.flip();
                IoBuffer newBuf = IoBuffer.allocate(
                        buf.remaining() + in.remaining()).setAutoExpand(true);
                newBuf.order(buf.order());
                newBuf.put(buf);
                newBuf.put(in);
                newBuf.flip();
                buf = newBuf;
                
                // Update the session attribute.
                session.setAttribute(BUFFER, buf);
            }

View Full Code Here

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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