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NCache Professional client for java.

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package com.alachisoft.ncache.client.internal.command;

import com.alachisoft.ncache.client.internal.communication.Connection;
import com.alachisoft.ncache.runtime.exceptions.CommandException;
import com.alachisoft.ncache.runtime.util.HelperFxn;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

public abstract class  InitialCommandBase extends Command{

    @Override
    protected void serializeCommand() {
        ByteArrayOutputStream stream = new ByteArrayOutputStream();

        ///Write discarding buffer that socketserver reads
        byte[] discardingBuffer = new byte[20];
        stream.write(discardingBuffer, 0, discardingBuffer.length);

        //Writes a section for acknowledgment buffer.
        byte[] acknowledgementBuffer = (getSupportsAacknowledgement() && inquiryEnabled) ? new byte[20] : new byte[0];
        stream.write(acknowledgementBuffer, 0, acknowledgementBuffer.length);

        // Writes a section for the command size.
        byte[] size = new byte[Connection.CmdSizeHolderBytesCount];
        stream.write(size, 0, size.length);

        //Writes the command.
        try {
            serializeCommandInternal(stream);
        } catch (IOException ignored) {
        }

        //All buffers acknowledgement/discarded/size will be using byte[] commandBytes
        // As stream in java has no way to set its Position
        commandBytes = stream.toByteArray();

        //lenght calculation of command
        int messageLen;
        messageLen = stream.size() - (size.length + acknowledgementBuffer.length + discardingBuffer.length);
        size = String.valueOf(messageLen).getBytes(StandardCharsets.UTF_8);

        //copy length at position filled dummy previously
        int offset=acknowledgementBuffer.length + discardingBuffer.length;
        System.arraycopy(size, 0, commandBytes, offset, size.length );
    }
    @Override
    public int getAcknowledgementOffset()
    {
        return 20;
    }
}