Zeromq/jzmq req/REP (C/S) mode and Java code example

The C/S mode is in the response state and cannot send multiple data at the same time.

Reference: http://blog.csdn.net/kaka11/article/details/6614479

1. Create CTX context objects. The objects will create io_thread and start them. The reactor model is used as poller for continuous polling. Inter-thread communication uses mailbox for communication, while mailbox is essentially a two-way socketpair.

2. Create a zmq_socket object. If it is a client, connect it with connector. If it is a server, use listener to listen.

3. The connetor or listener will create the object except zmq_init_t, Which is exchanged as identity.

4. After the above Initialization is completed, the corresponding session_t object will be created and associated with the corresponding read/write pipeline, plugin zmq_engine for real message data reading and writing.

5. Message data is read and written asynchronously, that is, calling zmq: zmq_send () and zmq: zmq_recv () only writes the message data to the corresponding pipeline. Session_t reads and writes the message data from the pipeline when poller polls the corresponding read/write events.

Let's not talk about the Code:

Server:

Package COM. zeromq. test. CS; import Org. zeromq. zmq;/*** @ author Lu Gui strong * @ email larry.lv.word@gmail.com * @ version Creation Time: 7:32:34 */public class hwserver {// Hello World server written in Java // Interprocess Communication IPC: // 11111, cross-host communication using TCP: // 10.5.0.170: 26666 // when receiving a message, rep will return a message // use req mode for inter-host communication connection: TCP: // localhost: 5555 // send "hello" to the server, receive "world" public static void main (string [] ARGs) {// create a context and initialize an io_thread // create one (maximum number of sockets + number of Io threads + 3) slots pointer array //. each socket object has its own mailbox. // B. each io_thread object also has its own mailbox. // C. the other three are the zmq_term thread, Reaper thread, and log thread mailbox. // corresponding zermq socket, such as req, rep, pair, push, pull... in this example, create the rep type // bind to the port and connect zmq in io_thread. context context = zmq. context (1); zmq. socket socket = context. socket (zmq. rep); socket. BIND ("TCP: // *: 5555"); While (true) {byte [] request; // wait for the next client request // wait for a string ending with 0 // ignore the last 0 print request = socket. recv (0); system. out. println ("received request: [" + new string (request, 0, request. length-1) + "]"); try {thread. sleep (1000);} catch (interruptedexception e) {e. printstacktrace ();} // returns a string whose last digit is 0 to the client string replystring = "world" + ""; byte [] Reply = replystring. getbytes (); reply [reply. length-1] = 0; socket. send (reply, zmq. noblock );}}}

Client:

Package COM. zeromq. test. CS; import Org. zeromq. zmq;/*** @ author Lu Gui strong * @ email larry.lv.word@gmail.com * @ version Creation Time: 7:07:19 */public class hwclient {// Hello World client written in Java // after sending the message, you must receive a response message before sending a new message. // Use req mode for inter-host communication and connection: TCP: // localhost: 5555 // send "hello" to the server, receive "world" public static void main (string [] ARGs) {zmq. context context = zmq. context (1); zmq. socket socket = context. socket (zmq. REQ); socket. connect ("TCP: // localhost: 5555"); For (INT request_nbr = 0; request_nbr <= 10; request_nbr ++) {// create a string whose end is 0 string requeststring = "hello" + ""; byte [] request = requeststring. getbytes (); request [request. length-1] = 0; // send socket. send (request, zmq. noblock); // obtain the returned value byte [] Reply = socket. recv (0); // The output removes the string system at the end of 0. out. println ("replicated ed reply" + request_nbr + ": [" + new string (reply, 0, reply. length-1) + "]") ;}}