public static void writeHeader(
ChannelBuffer buffer, long requestId, byte status, Version version) {
int index = buffer.readerIndex();
buffer.setByte(index, 'E');
index += 1;
buffer.setByte(index, 'S');
index += 1;
// write the size, the size indicates the remaining message size, not including the size int
buffer.setInt(index, buffer.readableBytes() - 6);
index += 4;
buffer.setLong(index, requestId);
index += 8;
buffer.setByte(index, status);
index += 1;
buffer.setInt(index, version.id);
}
@Override
protected Object encode(ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception {
// 重置channelbuffer, 重设参数length
ChannelBuffer b = (ChannelBuffer) msg;
b.setInt(0, b.readableBytes() - 4);
return b;
}
@Override
public void encode(MessageTree tree, ChannelBuffer buf) {
Message message = tree.getMessage();
if (message instanceof Transaction) {
int count = 0;
int index = buf.writerIndex();
BufferHelper helper = m_bufferHelper;
Transaction t = (Transaction) message;
Locator locator = new Locator();
Ruler ruler = new Ruler((int) t.getDurationInMicros());
ruler.setWidth(1400);
ruler.setHeight(18 * calculateLines(t) + 10);
ruler.setOffsetX(200);
ruler.setOffsetY(10);
buf.writeInt(0); // place-holder
count += helper.table1(buf);
count += helper.crlf(buf);
count += encodeHeader(tree, buf, ruler);
count += encodeRuler(buf, locator, ruler);
count += encodeTransaction(tree, t, buf, locator, ruler);
count += encodeFooter(tree, buf);
count += helper.table2(buf);
buf.setInt(index, count);
}
}
@Override
public void sendResponse(Throwable error) throws IOException {
BytesStreamOutput stream;
try {
stream = BytesStreamOutput.Cached.cached();
writeResponseExceptionHeader(stream);
RemoteTransportException tx =
new RemoteTransportException(
transport.nodeName(),
transport.wrapAddress(channel.getLocalAddress()),
action,
error);
ThrowableObjectOutputStream too = new ThrowableObjectOutputStream(stream);
too.writeObject(tx);
too.close();
} catch (NotSerializableException e) {
stream = BytesStreamOutput.Cached.cached();
writeResponseExceptionHeader(stream);
RemoteTransportException tx =
new RemoteTransportException(
transport.nodeName(),
transport.wrapAddress(channel.getLocalAddress()),
action,
new NotSerializableTransportException(error));
ThrowableObjectOutputStream too = new ThrowableObjectOutputStream(stream);
too.writeObject(tx);
too.close();
}
ChannelBuffer buffer = ChannelBuffers.wrappedBuffer(stream.copiedByteArray());
buffer.setInt(0, buffer.writerIndex() - 4); // update real size.
channel.write(buffer);
}
@Override
public void sendResponse(Streamable message) throws IOException {
HandlesStreamOutput stream = BytesStreamOutput.Cached.cachedHandles();
stream.writeBytes(LENGTH_PLACEHOLDER); // fake size
stream.writeLong(requestId);
byte status = 0;
status = setResponse(status);
stream.writeByte(status); // 0 for request, 1 for response.
message.writeTo(stream);
byte[] data = ((BytesStreamOutput) stream.wrappedOut()).copiedByteArray();
ChannelBuffer buffer = ChannelBuffers.wrappedBuffer(data);
buffer.setInt(0, buffer.writerIndex() - 4); // update real size.
channel.write(buffer);
}
@Override
public void encode(MessageTree tree, ChannelBuffer buf) {
int count = 0;
int index = buf.writerIndex();
BufferHelper helper = m_bufferHelper;
buf.writeInt(0); // place-holder
count += helper.table1(buf);
count += helper.crlf(buf);
count += encodeHeader(tree, buf);
if (tree.getMessage() != null) {
count += encodeMessage(tree, tree.getMessage(), buf, 0, new LineCounter());
}
count += helper.table2(buf);
buf.setInt(index, count);
}