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The messaging and data conversion protocol between Java and DolphinDB server
package com.xxdb.streaming.client;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;
import com.xxdb.data.*;
import com.xxdb.io.BigEndianDataInputStream;
import com.xxdb.io.ExtendedDataInput;
import com.xxdb.io.LittleEndianDataInputStream;
import com.xxdb.streaming.client.BasicMessage;
import com.xxdb.streaming.client.IMessage;
class MessageParser implements Runnable{
private final int MAX_FORM_VALUE = Entity.DATA_FORM.values().length -1;
private final int MAX_TYPE_VALUE = Entity.DATA_TYPE.values().length -1;
BufferedInputStream bis = null;
Socket socket = null;
MessageDispatcher dispatcher;
String topic;
public MessageParser(Socket socket, MessageDispatcher dispatcher){
this.socket = socket;
this.dispatcher = dispatcher;
}
private final static char[] hexArray = "0123456789ABCDEF".toCharArray();
public static String bytesToHex(byte[] bytes) {
char[] hexChars = new char[bytes.length * 2];
for ( int j = 0; j < bytes.length; j++ ) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
public void run(){
Socket socket = this.socket;
try {
if(bis == null) bis= new BufferedInputStream(socket.getInputStream());
long offset = -1;
ExtendedDataInput in = null;
while(true){
if (in == null) {
Boolean isLittle = bis.read() != 0;
if (isLittle == true)
in = new LittleEndianDataInputStream(bis);
else
in = new BigEndianDataInputStream(bis);
}
else {
in.readBoolean();
}
in.readLong();
long msgid = in.readLong();
if (offset == -1) {
offset = msgid;
} else {
assert(offset == msgid);
}
topic = in.readString();
short flag = in.readShort();
EntityFactory factory = new BasicEntityFactory();
int form = flag>>8;
int type = flag & 0xff;
if(form < 0 || form > MAX_FORM_VALUE)
throw new IOException("Invalid form value: " + form);
if(type <0 || type > MAX_TYPE_VALUE){
throw new IOException("Invalid type value: " + type);
}
Entity.DATA_FORM df = Entity.DATA_FORM.values()[form];
Entity.DATA_TYPE dt = Entity.DATA_TYPE.values()[type];
Entity body;
try
{
body = factory.createEntity(df, dt, in);
}
catch(Exception exception) {
throw exception;
}
if (body.isTable()) {
assert(body.rows() == 0);
}
else if (body.isVector()){
dispatcher.setMsgId(topic, msgid);
BasicAnyVector dTable = (BasicAnyVector)body;
int colSize = dTable.rows();
int rowSize = dTable.getEntity(0).rows();
if(rowSize>=1){
if(rowSize==1){
BasicMessage rec = new BasicMessage(msgid,topic,dTable);
dispatcher.dispatch(rec);
} else {
List messages = new ArrayList<>(rowSize);
for(int i=0;i