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org.zeromq.proto.ZPicture Maven / Gradle / Ivy

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package org.zeromq.proto;

import java.util.Locale;
import java.util.regex.Pattern;

import org.zeromq.ZFrame;
import org.zeromq.ZMQ;
import org.zeromq.ZMQ.Socket;
import org.zeromq.ZMQException;
import org.zeromq.ZMsg;
import zmq.ZError;
import zmq.util.Draft;

/**
 * De/serialization of data within a message.
 * 

* This is a DRAFT class, and may change without notice. */ @Draft public class ZPicture { private static final Pattern FORMAT = Pattern.compile("[i1248sbcfz]*m?"); private static final Pattern BINARY_FORMAT = Pattern.compile("[1248sSbcf]*m?"); /** * Creates a binary encoded 'picture' message to the socket (or actor), so it can be sent. * The arguments are encoded in a binary format that is compatible with zproto, and * is designed to reduce memory allocations. * * @param picture The picture argument is a string that defines the * type of each argument. Supports these argument types: *

*

* * * * * * * * * * * * *
Types of arguments
patternjava typezproto type
1inttype = "number" size = "1"
2inttype = "number" size = "2"
4longtype = "number" size = "3"
8longtype = "number" size = "4"
sString, 0-255 charstype = "string"
SString, 0-2^32-1 charstype = "longstr"
bbyte[], 0-2^32-1 bytestype = "chunk"
cbyte[], 0-2^32-1 bytestype = "chunk"
fZFrametype = "frame"
mZMsgtype = "msg" Has to be the last element of the picture
* @param args Arguments according to the picture * @return a new {@link ZMsg} that encode the arguments * @api.note Does not change or take ownership of any arguments. */ @Draft public ZMsg msgBinaryPicture(String picture, Object... args) { if (!BINARY_FORMAT.matcher(picture).matches()) { throw new ZMQException(picture + " is not in expected binary format " + BINARY_FORMAT.pattern(), ZError.EPROTO); } ZMsg msg = new ZMsg(); // Pass 1: calculate total size of data frame int frameSize = 0; for (int index = 0; index < picture.length(); index++) { char pattern = picture.charAt(index); switch (pattern) { case '1': { frameSize += 1; break; } case '2': { frameSize += 2; break; } case '4': { frameSize += 4; break; } case '8': { frameSize += 8; break; } case 's': { String string = (String) args[index]; frameSize += 1 + (string != null ? string.getBytes(ZMQ.CHARSET).length : 0); break; } case 'S': { String string = (String) args[index]; frameSize += 4 + (string != null ? string.getBytes(ZMQ.CHARSET).length : 0); break; } case 'b': case 'c': { byte[] block = (byte[]) args[index]; frameSize += 4 + block.length; break; } case 'f': { ZFrame frame = (ZFrame) args[index]; msg.add(frame); break; } case 'm': { ZMsg other = (ZMsg) args[index]; if (other == null) { msg.add(new ZFrame((byte[]) null)); } else { msg.addAll(other); } break; } default: assert (false) : "invalid picture element '" + pattern + "'"; } } // Pass 2: encode data into data frame ZFrame frame = new ZFrame(new byte[frameSize]); ZNeedle needle = new ZNeedle(frame); for (int index = 0; index < picture.length(); index++) { char pattern = picture.charAt(index); switch (pattern) { case '1': { needle.putNumber1((int) args[index]); break; } case '2': { needle.putNumber2((int) args[index]); break; } case '4': { needle.putNumber4((int) args[index]); break; } case '8': { needle.putNumber8((long) args[index]); break; } case 's': { needle.putString((String) args[index]); break; } case 'S': { needle.putLongString((String) args[index]); break; } case 'b': case 'c': { byte[] block = (byte[]) args[index]; needle.putNumber4(block.length); needle.putBlock(block, block.length); break; } case 'f': case 'm': break; default: assert (false) : "invalid picture element '" + pattern + "'"; } } msg.addFirst(frame); return msg; } @Draft public boolean sendBinaryPicture(Socket socket, String picture, Object... args) { return msgBinaryPicture(picture, args).send(socket); } /** * Receive a binary encoded 'picture' message from the socket (or actor). * This method is similar to {@link org.zeromq.ZMQ.Socket#recv()}, except the arguments are encoded * in a binary format that is compatible with zproto, and is designed to * reduce memory allocations. * * @param picture The picture argument is a string that defines * the type of each argument. See {@link #sendBinaryPicture(Socket, String, Object...)} * for the supported argument types. * @return the picture elements as object array **/ @Draft public Object[] recvBinaryPicture(Socket socket, final String picture) { if (!BINARY_FORMAT.matcher(picture).matches()) { throw new ZMQException(picture + " is not in expected binary format " + BINARY_FORMAT.pattern(), ZError.EPROTO); } ZFrame frame = ZFrame.recvFrame(socket); if (frame == null) { return null; } // Get the data frame ZNeedle needle = new ZNeedle(frame); Object[] results = new Object[picture.length()]; for (int index = 0; index < picture.length(); index++) { char pattern = picture.charAt(index); switch (pattern) { case '1': { results[index] = needle.getNumber1(); break; } case '2': { results[index] = needle.getNumber2(); break; } case '4': { results[index] = needle.getNumber4(); break; } case '8': { results[index] = needle.getNumber8(); break; } case 's': { results[index] = needle.getString(); break; } case 'S': { results[index] = needle.getLongString(); break; } case 'b': case 'c': { int size = needle.getNumber4(); results[index] = needle.getBlock(size); break; } case 'f': { // Get next frame off socket results[index] = ZFrame.recvFrame(socket); break; } case 'm': { // Get zero or more remaining frames results[index] = ZMsg.recvMsg(socket); break; } default: assert (false) : "invalid picture element '" + pattern + "'"; } } return results; } /** * Queues a 'picture' message to the socket (or actor), so it can be sent. * * @param picture The picture is a string that defines the type of each frame. * This makes it easy to send a complex multiframe message in * one call. The picture can contain any of these characters, * each corresponding to zero or one arguments: * *

*

* * * * * * * * * * * * *
Types of arguments
i = int (stores signed integer)
1 = byte (stores 8-bit unsigned integer)
2 = int (stores 16-bit unsigned integer)
4 = long (stores 32-bit unsigned integer)
8 = long (stores 64-bit unsigned integer)
s = String
b = byte[]
c = byte[]
f = ZFrame
m = ZMsg (sends all frames in the ZMsg)Has to be the last element of the picture
z = sends zero-sized frame (0 arguments)
* Note that s, b, f and m are encoded the same way and the choice is * offered as a convenience to the sender, which may or may not already * have data in a ZFrame or ZMsg. Does not change or take ownership of * any arguments. *

* Also see {@link #recvPicture(Socket, String)}} how to recv a * multiframe picture. * @param args Arguments according to the picture * @return true if successful, false if sending failed for any reason */ @Draft public boolean sendPicture(Socket socket, String picture, Object... args) { if (!FORMAT.matcher(picture).matches()) { throw new ZMQException(picture + " is not in expected format " + FORMAT.pattern(), ZError.EPROTO); } ZMsg msg = new ZMsg(); for (int pictureIndex = 0, argIndex = 0; pictureIndex < picture.length(); pictureIndex++, argIndex++) { char pattern = picture.charAt(pictureIndex); switch (pattern) { case 'i': { msg.add(String.format(Locale.ENGLISH, "%d", (int) args[argIndex])); break; } case '1': { msg.add(String.format(Locale.ENGLISH, "%d", (0xff) & (int) args[argIndex])); break; } case '2': { msg.add(String.format(Locale.ENGLISH, "%d", (0xffff) & (int) args[argIndex])); break; } case '4': { msg.add(String.format(Locale.ENGLISH, "%d", (0xffffffff) & (int) args[argIndex])); break; } case '8': { msg.add(String.format(Locale.ENGLISH, "%d", (long) args[argIndex])); break; } case 's': { msg.add((String) args[argIndex]); break; } case 'b': case 'c': { msg.add((byte[]) args[argIndex]); break; } case 'f': { msg.add((ZFrame) args[argIndex]); break; } case 'm': { ZMsg msgParm = (ZMsg) args[argIndex]; while (!msgParm.isEmpty()) { msg.add(msgParm.pop()); } break; } case 'z': { msg.add((byte[]) null); argIndex--; break; } default: assert (false) : "invalid picture element '" + pattern + "'"; } } return msg.send(socket, false); } /** * Receive a 'picture' message to the socket (or actor). * * * @param picture The picture is a string that defines the type of each frame. * This makes it easy to recv a complex multiframe message in * one call. The picture can contain any of these characters, * each corresponding to zero or one elements in the result: * *

*

* * * * * * * * * * * *
Types of arguments
i = int (stores signed integer)
1 = int (stores 8-bit unsigned integer)
2 = int (stores 16-bit unsigned integer)
4 = long (stores 32-bit unsigned integer)
8 = long (stores 64-bit unsigned integer)
s = String
b = byte[]
f = ZFrame (creates zframe)
m = ZMsg (creates a zmsg with the remaing frames)
z = null, asserts empty frame (0 arguments)
* * Also see {@link #sendPicture(Socket, String, Object...)} how to send a * multiframe picture. * * @return the picture elements as object array */ @Draft public Object[] recvPicture(Socket socket, String picture) { if (!FORMAT.matcher(picture).matches()) { throw new ZMQException(picture + " is not in expected format " + FORMAT.pattern(), ZError.EPROTO); } Object[] elements = new Object[picture.length()]; for (int index = 0; index < picture.length(); index++) { char pattern = picture.charAt(index); switch (pattern) { case 'i': { elements[index] = Integer.valueOf(socket.recvStr()); break; } case '1': { elements[index] = (0xff) & Integer.parseInt(socket.recvStr()); break; } case '2': { elements[index] = (0xffff) & Integer.parseInt(socket.recvStr()); break; } case '4': { elements[index] = (0xffffffff) & Integer.parseInt(socket.recvStr()); break; } case '8': { elements[index] = Long.valueOf(socket.recvStr()); break; } case 's': { elements[index] = socket.recvStr(); break; } case 'b': case 'c': { elements[index] = socket.recv(); break; } case 'f': { elements[index] = ZFrame.recvFrame(socket); break; } case 'm': { elements[index] = ZMsg.recvMsg(socket); break; } case 'z': { ZFrame zeroFrame = ZFrame.recvFrame(socket); if (zeroFrame == null || zeroFrame.size() > 0) { throw new ZMQException("zero frame is not empty", ZError.EPROTO); } elements[index] = new ZFrame((byte[]) null); break; } default: assert (false) : "invalid picture element '" + pattern + "'"; } } return elements; } }




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