/**
* Examines the channel buffer and attempts to match the protocol of the request and invoke the
* matching {@link ProtocolInitiator}.
*
* @param ctx The channel handler context
* @param channel The channel
* @param bufferx The message buffer
* @param e The channel event
* @return The channel buffer to send upstream, or null if we need more bytes
*/
protected ChannelBuffer protocolSwitch(
ChannelHandlerContext ctx, Channel channel, ChannelBuffer bufferx, ChannelEvent e) {
ChannelBuffer cb = preSwitchedBuffer.get(channel);
if (cb != null) {
cb.writeBytes(bufferx);
cb.resetReaderIndex();
} else {
cb = bufferx;
}
// this guy will be set with a matching initiator
ProtocolInitiator selectedInitiator = null;
// this guy will be set to false if at least 1 initiator had insufficient bytes to match
boolean sufficientBytes = true;
// ths guy has the total bytes available in the buffer
final int bytesAvailable = cb.readableBytes();
for (ProtocolInitiator pi : initiators.values()) {
if (pi.requiredBytes() > bytesAvailable) {
sufficientBytes = false;
} else {
if (pi.match(cb)) {
selectedInitiator = pi;
break;
}
}
}
if (selectedInitiator == null) {
// we did not get a match
if (!sufficientBytes) {
// ok, we did not have enough bytes
DynamicChannelBuffer dcb = preSwitchedBuffer.get(channel);
if (dcb == null) {
dcb = new DynamicChannelBuffer(cb.order(), 1024, chanelBufferFactory);
preSwitchedBuffer.set(channel, dcb);
}
dcb.writeBytes(cb);
dcb.resetReaderIndex();
return null;
}
// darn, we have enough bytes for any of the inits,
// but none matched
throw new RuntimeException("Failed to match any protocol initiator");
}
preSwitchedBuffer.remove(channel);
// we matched on an initiator, so have it modify the pipeline
selectedInitiator.modifyPipeline(ctx, channel, cb);
return cb;
// if we get here, it means we did not find a protocol match
// so pass to the default protocol initiator.
}
// TODO this is all a bit of a pain - if we can just throw exceptions if people set stuff outside
// of the buffer
// like Netty that would be preferable
private void ensureWritable(int pos, int len) {
int ni = pos + len;
int cap = buffer.capacity();
int over = ni - cap;
if (over > 0) {
buffer.writerIndex(cap);
buffer.ensureWritableBytes(over);
}
// We have to make sure that the writerindex is always positioned on the last bit of data set in
// the buffer
if (ni > buffer.writerIndex()) {
buffer.writerIndex(ni);
}
}
/**
* Appends the specified {@code Buffer} to the end of the Buffer. The buffer will expand as
* necessary to accomodate any bytes written.
*
* <p>Returns a reference to {@code this} so multiple operations can be appended together.
*/
public Buffer appendBuffer(Buffer buff) {
ChannelBuffer cb = buff.getChannelBuffer();
buffer.writeBytes(buff.getChannelBuffer());
cb.readerIndex(
0); // Need to reset readerindex since Netty write modifies readerIndex of source!
return this;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Buffer buffer1 = (Buffer) o;
return buffer.equals(buffer1.buffer);
}
/**
* Sets the {@code double} at position {@code pos} in the Buffer to the value {@code i}.
*
* <p>The buffer will expand as necessary to accomodate any value written.
*/
public Buffer setDouble(int pos, double d) {
ensureWritable(pos, 8);
buffer.setDouble(pos, d);
return this;
}
/**
* Sets the {@code long} at position {@code pos} in the Buffer to the value {@code i}.
*
* <p>The buffer will expand as necessary to accomodate any value written.
*/
public Buffer setLong(int pos, long l) {
ensureWritable(pos, 8);
buffer.setLong(pos, l);
return this;
}
/**
* Returns the {@code short} at position {@code pos} in the Buffer.
*
* @throws IndexOutOfBoundsException if the specified {@code pos} is less than {@code 0} or {@code
* pos + 2} is greater than the length {@code } of the Buffer.
*/
public short getShort(int pos) {
return buffer.getShort(pos);
}
private Buffer setBytes(int pos, String str, Charset charset) {
byte[] bytes = str.getBytes(charset);
ensureWritable(pos, bytes.length);
buffer.setBytes(pos, bytes);
return this;
}
/** Returns a copy of the entire Buffer. */
public Buffer copy() {
return new Buffer(buffer.copy());
}
/**
* Sets the bytes at position {@code pos} in the Buffer to the value {@code b}.
*
* <p>The buffer will expand as necessary to accomodate any value written.
*/
public Buffer setBytes(int pos, byte[] b) {
ensureWritable(pos, b.length);
buffer.setBytes(pos, b);
return this;
}
/**
* Sets the bytes at position {@code pos} in the Buffer to the value {@code b}.
*
* <p>The buffer will expand as necessary to accomodate any value written.
*/
public Buffer setBuffer(int pos, Buffer b) {
ensureWritable(pos, b.length());
buffer.setBytes(pos, b.getChannelBuffer());
return this;
}
/**
* Appends the specified {@code long} to the end of the Buffer. The buffer will expand as
* necessary to accomodate any bytes written.
*
* <p>Returns a reference to {@code this} so multiple operations can be appended together.
*/
public Buffer appendLong(long l) {
buffer.writeLong(l);
return this;
}
/**
* Appends the specified {@code int} to the end of the Buffer. The buffer will expand as necessary
* to accomodate any bytes written.
*
* <p>Returns a reference to {@code this} so multiple operations can be appended together.
*/
public Buffer appendInt(int i) {
buffer.writeInt(i);
return this;
}
/**
* Appends the specified {@code byte} to the end of the Buffer. The buffer will expand as
* necessary to accomodate any bytes written.
*
* <p>Returns a reference to {@code this} so multiple operations can be appended together.
*/
public Buffer appendByte(byte b) {
buffer.writeByte(b);
return this;
}
/**
* Appends the specified {@code byte[]} to the end of the Buffer. The buffer will expand as
* necessary to accomodate any bytes written.
*
* <p>Returns a reference to {@code this} so multiple operations can be appended together.
*/
public Buffer appendBytes(byte[] bytes) {
buffer.writeBytes(bytes);
return this;
}
/**
* Returns a copy of a sub-sequence the Buffer as a {@code byte[]} starting at position {@code
* start} and ending at position {@code end - 1}
*/
public byte[] getBytes(int start, int end) {
byte[] arr = new byte[end - start];
buffer.getBytes(start, arr, 0, end - start);
return arr;
}
/** Returns a copy of the entire Buffer as a {@code byte[]} */
public byte[] getBytes() {
byte[] arr = new byte[buffer.writerIndex()];
buffer.getBytes(0, arr);
return arr;
}
/**
* Sets the {@code float} at position {@code pos} in the Buffer to the value {@code i}.
*
* <p>The buffer will expand as necessary to accomodate any value written.
*/
public Buffer setFloat(int pos, float f) {
ensureWritable(pos, 4);
buffer.setFloat(pos, f);
return this;
}
/**
* Sets the {@code short} at position {@code pos} in the Buffer to the value {@code i}.
*
* <p>The buffer will expand as necessary to accomodate any value written.
*/
public Buffer setShort(int pos, short s) {
ensureWritable(pos, 2);
buffer.setShort(pos, s);
return this;
}
/**
* Appends the specified {@code short} to the end of the Buffer.The buffer will expand as
* necessary to accomodate any bytes written.
*
* <p>Returns a reference to {@code this} so multiple operations can be appended together.
*/
public Buffer appendShort(short s) {
buffer.writeShort(s);
return this;
}
/**
* Sets the bytes at position {@code pos} in the Buffer to the value {@code b}.
*
* <p>The buffer will expand as necessary to accomodate any value written.
*/
public Buffer setBytes(int pos, ByteBuffer b) {
ensureWritable(pos, b.limit());
buffer.setBytes(pos, b);
return this;
}
/**
* Appends the specified {@code float} to the end of the Buffer. The buffer will expand as
* necessary to accomodate any bytes written.
*
* <p>Returns a reference to {@code this} so multiple operations can be appended together.
*/
public Buffer appendFloat(float f) {
buffer.writeFloat(f);
return this;
}
/**
* Returns the length of the buffer, measured in bytes. The length is defined as the largest
* position of any byte in the buffer + 1. All positions are indexed from zero.
*/
public int length() {
return buffer.writerIndex();
}
/**
* Appends the specified {@code double} to the end of the Buffer. The buffer will expand as
* necessary to accomodate any bytes written.
*
* <p>Returns a reference to {@code this} so multiple operations can be appended together.
*/
public Buffer appendDouble(double d) {
buffer.writeDouble(d);
return this;
}
private Buffer append(String str, Charset charset) {
byte[] bytes = str.getBytes(charset);
buffer.writeBytes(bytes);
return this;
}
/**
* Returns the {@code double} at position {@code pos} in the Buffer.
*
* @throws IndexOutOfBoundsException if the specified {@code pos} is less than {@code 0} or {@code
* pos + 8} is greater than the length {@code } of the Buffer.
*/
public double getDouble(int pos) {
return buffer.getDouble(pos);
}
/**
* Sets the {@code byte} at position {@code pos} in the Buffer to the value {@code b}.
*
* <p>The buffer will expand as necessary to accomodate any value written.
*/
public Buffer setByte(int pos, byte b) {
ensureWritable(pos, 1);
buffer.setByte(pos, b);
return this;
}
/**
* Returns the {@code float} at position {@code pos} in the Buffer.
*
* @throws IndexOutOfBoundsException if the specified {@code pos} is less than {@code 0} or {@code
* pos + 4} is greater than the length {@code } of the Buffer.
*/
public float getFloat(int pos) {
return buffer.getFloat(pos);
}
/**
* Sets the {@code int} at position {@code pos} in the Buffer to the value {@code i}.
*
* <p>The buffer will expand as necessary to accomodate any value written.
*/
public Buffer setInt(int pos, int i) {
ensureWritable(pos, 4);
buffer.setInt(pos, i);
return this;
}
/**
* Returns the {@code long} at position {@code pos} in the Buffer.
*
* @throws IndexOutOfBoundsException if the specified {@code pos} is less than {@code 0} or {@code
* pos + 8} is greater than the length {@code } of the Buffer.
*/
public long getLong(int pos) {
return buffer.getLong(pos);
}