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) $

     * @param step the current step in the handshake process
     */
    private void writeRequest(final NextFilter nextFilter,
            final SocksProxyRequest request, int step) {
        try {
            IoBuffer buf = null;


            if (step == SocksProxyConstants.SOCKS5_GREETING_STEP) {
                buf = encodeInitialGreetingPacket(request);
            } else if (step == SocksProxyConstants.SOCKS5_AUTH_STEP) {
                // This step can happen multiple times like in GSSAPI auth for instance
                buf = encodeAuthenticationPacket(request);
                // If buf is null then go to the next step
                if (buf == null) {
                    step = SocksProxyConstants.SOCKS5_REQUEST_STEP;
                }
            }


            if (step == SocksProxyConstants.SOCKS5_REQUEST_STEP) {
                buf = encodeProxyRequestPacket(request);
            }


            buf.flip();
            writeData(nextFilter, buf);


        } catch (Exception ex) {
            closeSession("Unable to send Socks request: ", ex);
        }

View Full Code Here


            if (isV4ARequest) {
                len += host.length + 1;
            }


            IoBuffer buf = IoBuffer.allocate(len);


            buf.put(request.getProtocolVersion());
            buf.put(request.getCommandCode());
            buf.put(request.getPort());
            buf.put(request.getIpAddress());
            buf.put(userID);
            buf.put(SocksProxyConstants.TERMINATOR);


            if (isV4ARequest) {
                buf.put(host);
                buf.put(SocksProxyConstants.TERMINATOR);
            }


            if (isV4ARequest) {
                logger.debug("  sending SOCKS4a request");
            } else {
                logger.debug("  sending SOCKS4 request");
            }


            buf.flip();
            writeData(nextFilter, buf);
        } catch (Exception ex) {
            closeSession("Unable to send Socks request: ", ex);
        }
    }

View Full Code Here

    public void write(byte[] b, int off, int len) throws IOException {
        out.write(b, off, len);
    }


    public void writeObject(Object obj) throws IOException {
        IoBuffer buf = IoBuffer.allocate(64, false);
        buf.setAutoExpand(true);
        buf.putObject(obj);


        int objectSize = buf.position() - 4;
        if (objectSize > maxObjectSize) {
            throw new IllegalArgumentException(
                    "The encoded object is too big: " + objectSize + " (> "
                            + maxObjectSize + ')');
        }


        out.write(buf.array(), 0, buf.position());
    }

View Full Code Here

     * Get decrypted application data.
     *
     * @return buffer with data
     */
    public IoBuffer fetchAppBuffer() {
        IoBuffer appBuffer = this.appBuffer.flip();
        this.appBuffer = null;
        return appBuffer;
    }

View Full Code Here

     * 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();
    }

View Full Code Here

            ProtocolEncoderOutput out) throws Exception {
        if (!(message instanceof Serializable)) {
            throw new NotSerializableException();
        }


        IoBuffer buf = IoBuffer.allocate(64);
        buf.setAutoExpand(true);
        buf.putObject(message);


        int objectSize = buf.position() - 4;
        if (objectSize > maxObjectSize) {
            throw new IllegalArgumentException(
                    "The encoded object is too big: " + objectSize + " (> "
                            + maxObjectSize + ')');
        }


        buf.flip();
        out.write(buf);
    }

View Full Code Here


        // 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));
                }
            }

View Full Code Here

     *
     * @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


            AbstractIoSession s = (AbstractIoSession) session;


            // Maintain counters.
            if (writeRequest.getMessage() instanceof IoBuffer) {
                IoBuffer buffer = (IoBuffer) writeRequest.getMessage();
                // I/O processor implementation will call buffer.reset()
                // it after the write operation is finished, because
                // the buffer will be specified with messageSent event.
                buffer.mark();
                int remaining = buffer.remaining();
                if (remaining == 0) {
                    // Zero-sized buffer means the internal message
                    // delimiter.
                    s.increaseScheduledWriteMessages();
                } else {

View Full Code Here

        assertEquals(200, cba.last());
    }


    private BufferByteArray wrapString(String string) {
        byte[] bytes = string.getBytes();
        IoBuffer bb = IoBuffer.wrap(bytes);
        BufferByteArray ba = new BufferByteArray(bb) {


            @Override
            public void free() {
                addOperation(this + ".free()");

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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