zmq.io.coder.v2.V2Encoder Maven / Gradle / Ivy
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Pure Java implementation of libzmq
package zmq.io.coder.v2;
import java.nio.ByteBuffer;
import zmq.io.coder.Encoder;
import zmq.util.Errno;
import zmq.util.Wire;
// Encoder for 0MQ framing protocol. Converts messages into data stream.
public class V2Encoder extends Encoder
{
private final ByteBuffer tmpbufWrap;
public V2Encoder(Errno errno, int bufsize)
{
super(errno, bufsize);
tmpbufWrap = ByteBuffer.allocate(9);
// Write 0 bytes to the batch and go to messageReady state.
initStep(messageReady, true);
}
@Override
protected void messageReady()
{
// Encode flags.
byte protocolFlags = 0;
if (inProgress.hasMore()) {
protocolFlags |= V2Protocol.MORE_FLAG;
}
if (inProgress.size() > 255) {
protocolFlags |= V2Protocol.LARGE_FLAG;
}
if (inProgress.isCommand()) {
protocolFlags |= V2Protocol.COMMAND_FLAG;
}
// Encode the message length. For messages less then 256 bytes,
// the length is encoded as 8-bit unsigned integer. For larger
// messages, 64-bit unsigned integer in network byte order is used.
final int size = inProgress.size();
tmpbufWrap.position(0);
tmpbufWrap.put(protocolFlags);
if (size > 255) {
tmpbufWrap.limit(9);
Wire.putUInt64(tmpbufWrap, size);
}
else {
tmpbufWrap.limit(2);
tmpbufWrap.put((byte) size);
}
nextStep(tmpbufWrap, tmpbufWrap.limit(), sizeReady, false);
}
@Override
protected void sizeReady()
{
// Write message body into the buffer.
nextStep(inProgress.buf(), inProgress.size(), messageReady, true);
}
}
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