Examples of com.facebook.presto.jdbc.internal.netty.buffer.ChannelBuffer

Package com.facebook.presto.jdbc.internal.netty.buffer

Examples of com.facebook.presto.jdbc.internal.netty.buffer.ChannelBuffer

com.facebook.presto.jdbc.internal.netty.buffer.ChannelBuffer
kipedia.org/wiki/Zero-based_numbering">zero-based indexing. It means the index of the first byte is always {@code 0} and the index of the last byte isalways {@link #capacity() capacity - 1}. For example, to iterate all bytes of a buffer, you can do the following, regardless of its internal implementation:
```
 {@link ChannelBuffer} buffer = ...;for (int i = 0; i < buffer.capacity(); i ++) { byte b = buffer.getByte(i); System.out.println((char) b); } 
```
Sequential Access Indexing
{@link ChannelBuffer} provides two pointer variables to support sequentialread and write operations - {@link #readerIndex() readerIndex} for a readoperation and {@link #writerIndex() writerIndex} for a write operationrespectively. The following diagram shows how a buffer is segmented into three areas by the two pointers:
```
 +-------------------+------------------+------------------+ | discardable bytes |  readable bytes  |  writable bytes  | |                   |     (CONTENT)    |                  | +-------------------+------------------+------------------+ |                   |                  |                  | 0      <=      readerIndex   <=   writerIndex    <=    capacity 
```
Readable bytes (the actual content)
This segment is where the actual data is stored. Any operation whose name starts with {@code read} or {@code skip} will get or skip the data at thecurrent {@link #readerIndex() readerIndex} and increase it by the number ofread bytes. If the argument of the read operation is also a {@link ChannelBuffer} and no destination index is specified, the specifiedbuffer's {@link #readerIndex() readerIndex} is increased together.
If there's not enough content left, {@link IndexOutOfBoundsException} israised. The default value of newly allocated, wrapped or copied buffer's {@link #readerIndex() readerIndex} is {@code 0}.
```
 // Iterates the readable bytes of a buffer. {@link ChannelBuffer} buffer = ...;while (buffer.readable()) { System.out.println(buffer.readByte()); } 
```
Writable bytes
This segment is a undefined space which needs to be filled. Any operation whose name ends with {@code write} will write the data at the current{@link #writerIndex() writerIndex} and increase it by the number of writtenbytes. If the argument of the write operation is also a {@link ChannelBuffer}, and no source index is specified, the specified buffer's {@link #readerIndex() readerIndex} is increased together.
If there's not enough writable bytes left, {@link IndexOutOfBoundsException}is raised. The default value of newly allocated buffer's {@link #writerIndex() writerIndex} is {@code 0}. The default value of wrapped or copied buffer's {@link #writerIndex() writerIndex} is the{@link #capacity() capacity} of the buffer.
```
 // Fills the writable bytes of a buffer with random integers. {@link ChannelBuffer} buffer = ...;while (buffer.writableBytes() >= 4) { buffer.writeInt(random.nextInt()); } 
```
Discardable bytes
This segment contains the bytes which were read already by a read operation. Initially, the size of this segment is {@code 0}, but its size increases up to the {@link #writerIndex() writerIndex} as read operations are executed.The read bytes can be discarded by calling {@link #discardReadBytes()} toreclaim unused area as depicted by the following diagram:
```
 BEFORE discardReadBytes() +-------------------+------------------+------------------+ | discardable bytes |  readable bytes  |  writable bytes  | +-------------------+------------------+------------------+ |                   |                  |                  | 0      <=      readerIndex   <=   writerIndex    <=    capacity AFTER discardReadBytes() +------------------+--------------------------------------+ |  readable bytes  |    writable bytes (got more space)   | +------------------+--------------------------------------+ |                  |                                      | readerIndex (0) <= writerIndex (decreased)        <=        capacity 
```
Please note that there is no guarantee about the content of writable bytes after calling {@link #discardReadBytes()}. The writable bytes will not be moved in most cases and could even be filled with completely different data depending on the underlying buffer implementation.
Clearing the buffer indexes
You can set both {@link #readerIndex() readerIndex} and{@link #writerIndex() writerIndex} to {@code 0} by calling {@link #clear()}. It does not clear the buffer content (e.g. filling with {@code 0}) but just clears the two pointers. Please also note that the semantic of this operation is different from {@link ByteBuffer#clear()}.
```
 BEFORE clear() +-------------------+------------------+------------------+ | discardable bytes |  readable bytes  |  writable bytes  | +-------------------+------------------+------------------+ |                   |                  |                  | 0      <=      readerIndex   <=   writerIndex    <=    capacity AFTER clear() +---------------------------------------------------------+ |             writable bytes (got more space)             | +---------------------------------------------------------+ |                                                         | 0 = readerIndex = writerIndex            <=            capacity 
```
Search operations
Various {@link #indexOf(int,int,byte)} methods help you locate an index ofa value which meets a certain criteria. Complicated dynamic sequential search can be done with {@link ChannelBufferIndexFinder} as well as simplestatic single byte search.
If you are decoding variable length data such as NUL-terminated string, you will find {@link #bytesBefore(byte)} also useful.
Mark and reset
There are two marker indexes in every buffer. One is for storing {@link #readerIndex() readerIndex} and the other is for storing{@link #writerIndex() writerIndex}. You can always reposition one of the two indexes by calling a reset method. It works in a similar fashion to the mark and reset methods in {@link InputStream} except that there's no{@code readlimit}.
Derived buffers
You can create a view of an existing buffer by calling either {@link #duplicate()}, {@link #slice()} or {@link #slice(int,int)}. A derived buffer will have an independent {@link #readerIndex() readerIndex}, {@link #writerIndex() writerIndex} and marker indexes, while it sharesother internal data representation, just like a NIO buffer does.
In case a completely fresh copy of an existing buffer is required, please call {@link #copy()} method instead.
Conversion to existing JDK types

Byte array
If a {@link ChannelBuffer} is backed by a byte array (i.e. {@code byte[]}), you can access it directly via the {@link #array()} method. To determineif a buffer is backed by a byte array, {@link #hasArray()} should be used.
NIO Buffers
Various {@link #toByteBuffer()} and {@link #toByteBuffers()} methods converta {@link ChannelBuffer} into one or more NIO buffers. These methods avoidbuffer allocation and memory copy whenever possible, but there's no guarantee that memory copy will not be involved.
Strings
Various {@link #toString(String)} methods convert a {@link ChannelBuffer}into a {@link String}. Please note that {@link #toString()} is not aconversion method.
I/O Streams
Please refer to {@link ChannelBufferInputStream} and{@link ChannelBufferOutputStream}. @apiviz.landmark


    /**
     * Stores the internal cumulative buffer's reader position.
     */
    protected void checkpoint() {
        ChannelBuffer cumulation = this.cumulation;
        if (cumulation != null) {
            checkpoint = cumulation.readerIndex();
        } else {
            checkpoint = -1; // buffer not available (already cleaned up)
        }
    }

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            }
        }
    }


    protected ChannelBuffer appendToCumulation(ChannelBuffer input) {
        ChannelBuffer cumulation = this.cumulation;
        assert cumulation.readable();
        if (cumulation instanceof CompositeChannelBuffer) {
            // Make sure the resulting cumulation buffer has no more than the configured components.
            CompositeChannelBuffer composite = (CompositeChannelBuffer) cumulation;
            if (composite.numComponents() >= maxCumulationBufferComponents) {
                cumulation = composite.copy();

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        this.cumulation = input = ChannelBuffers.wrappedBuffer(cumulation, input);
        return input;
    }


    protected ChannelBuffer updateCumulation(ChannelHandlerContext ctx, ChannelBuffer input) {
        ChannelBuffer newCumulation;
        int readableBytes = input.readableBytes();
        if (readableBytes > 0) {
            int inputCapacity = input.capacity();


            // If input.readableBytes() == input.capacity() (i.e. input is full),

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        if (!(m instanceof ChannelBuffer)) {
            ctx.sendUpstream(e);
            return;
        }


        ChannelBuffer input = (ChannelBuffer) m;
        if (!input.readable()) {
            return;
        }


        needsCleanup = true;


        if (cumulation == null) {
            // the cumulation buffer is not created yet so just pass the input
            // to callDecode(...) method
            cumulation = input;


            int oldReaderIndex = input.readerIndex();
            int inputSize = input.readableBytes();


            try {
                callDecode(
                        ctx, e.getChannel(),
                        input, replayable,
                        e.getRemoteAddress());
            } finally {
                int readableBytes = input.readableBytes();
                if (readableBytes > 0) {
                    int inputCapacity = input.capacity();
                    // check if readableBytes == capacity we can safe the copy as we will not be able to
                    // optimize memory usage anyway
                    boolean copy =
                            readableBytes != inputCapacity &&
                            inputCapacity > getMaxCumulationBufferCapacity();


                    // seems like there is something readable left in the input buffer
                    // or decoder wants a replay - create the cumulation buffer and
                    // copy the input into it
                    ChannelBuffer cumulation;
                    if (checkpoint > 0) {
                        int bytesToPreserve = inputSize - (checkpoint - oldReaderIndex);
                        if (copy) {
                            this.cumulation = cumulation = newCumulationBuffer(ctx, bytesToPreserve);
                            cumulation.writeBytes(input, checkpoint, bytesToPreserve);
                        } else {
                            this.cumulation = input.slice(checkpoint, bytesToPreserve);
                        }
                    } else if (checkpoint == 0) {
                        if (copy) {
                            this.cumulation = cumulation = newCumulationBuffer(ctx, inputSize);
                            cumulation.writeBytes(input, oldReaderIndex, inputSize);
                            cumulation.readerIndex(input.readerIndex());
                        } else {
                            this.cumulation = cumulation = input.slice(oldReaderIndex, inputSize);
                            cumulation.readerIndex(input.readerIndex());
                        }
                    } else {
                        if (copy) {
                            this.cumulation = cumulation = newCumulationBuffer(ctx, input.readableBytes());
                            cumulation.writeBytes(input);
                        } else {
                            this.cumulation = input;
                        }
                    }
                } else {

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     * {@link #channelClosed(ChannelHandlerContext, ChannelStateEvent)}
     */
    protected void cleanup(ChannelHandlerContext ctx, ChannelStateEvent e)
            throws Exception {
        try {
            ChannelBuffer cumulation = this.cumulation;
            if (cumulation == null) {
                return;
            }


            this.cumulation = null;


            if (cumulation.readable()) {
                // Make sure all frames are read before notifying a closed channel.
                callDecode(ctx, ctx.getChannel(), cumulation, null);
            }


            // Call decodeLast() finally.  Please note that decodeLast() is

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     * Returns the internal cumulative buffer of this decoder.  You usually
     * do not need to access the internal buffer directly to write a decoder.
     * Use it only when you must use it at your own risk.
     */
    protected ChannelBuffer internalBuffer() {
        ChannelBuffer buf = cumulation;
        if (buf == null) {
            return ChannelBuffers.EMPTY_BUFFER;
        }
        return buf;
    }

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     *
     * <strong>Be sure that this method MUST not modify the readerIndex of the given buffer</strong>
     *
     */
    protected ChannelBuffer extractFrame(ChannelBuffer buffer, int index, int length) {
        ChannelBuffer frame = buffer.factory().getBuffer(length);
        frame.writeBytes(buffer, index, length);
        return frame;
    }

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    @Override
    protected void cleanup(ChannelHandlerContext ctx, ChannelStateEvent e)
            throws Exception {
        try {
            ChannelBuffer cumulation = this.cumulation;
            if (!needsCleanup) {
                return;
            }


            needsCleanup = false;
            replayable.terminate();


            if (cumulation != null && cumulation.readable()) {
                // Make sure all data was read before notifying a closed channel.
                callDecode(ctx, e.getChannel(), cumulation, replayable, null);
            }


            // Call decodeLast() finally.  Please note that decodeLast() is

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    protected Object decode(
            ChannelHandlerContext ctx, Channel channel, ChannelBuffer buffer) throws Exception {
        if (buffer.readableBytes() < frameLength) {
            return null;
        } else {
            ChannelBuffer frame = extractFrame(buffer, buffer.readerIndex(), frameLength);
            buffer.skipBytes(frameLength);
            return frame;
        }
    }

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        }
        if (numHeaders > SPDY_MAX_NV_LENGTH) {
            throw new IllegalArgumentException(
                    "header block contains too many headers");
        }
        ChannelBuffer headerBlock = ChannelBuffers.dynamicBuffer(
                ByteOrder.BIG_ENDIAN, 256);
        writeLengthField(headerBlock, numHeaders);
        for (String name: names) {
            byte[] nameBytes = name.getBytes("UTF-8");
            writeLengthField(headerBlock, nameBytes.length);
            headerBlock.writeBytes(nameBytes);
            int savedIndex = headerBlock.writerIndex();
            int valueLength = 0;
            writeLengthField(headerBlock, valueLength);
            for (String value: headerFrame.getHeaders(name)) {
                byte[] valueBytes = value.getBytes("UTF-8");
                if (valueBytes.length > 0) {
                    headerBlock.writeBytes(valueBytes);
                    headerBlock.writeByte(0);
                    valueLength += valueBytes.length + 1;
                }
            }
            if (valueLength == 0) {
                if (version < 3) {
                    throw new IllegalArgumentException(
                            "header value cannot be empty: " + name);
                }
            } else {
                valueLength --;
            }
            if (valueLength > SPDY_MAX_NV_LENGTH) {
                throw new IllegalArgumentException(
                        "header exceeds allowable length: " + name);
            }
            if (valueLength > 0) {
                setLengthField(headerBlock, savedIndex, valueLength);
                headerBlock.writerIndex(headerBlock.writerIndex() - 1);
            }
        }
        return headerBlock;
    }

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Examples of com.facebook.presto.jdbc.internal.netty.buffer.ChannelBuffer

Sequential Access Indexing

Readable bytes (the actual content)

Writable bytes

Discardable bytes

Clearing the buffer indexes

Search operations

Mark and reset

Derived buffers

Conversion to existing JDK types

Byte array

NIO Buffers

Strings

I/O Streams

Related Classes of com.facebook.presto.jdbc.internal.netty.buffer.ChannelBuffer