org.jgroups.demos.PubClient Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
package org.jgroups.demos;
import org.jgroups.Address;
import org.jgroups.Global;
import org.jgroups.blocks.cs.*;
import org.jgroups.util.Bits;
import org.jgroups.util.Util;
import java.io.BufferedInputStream;
import java.io.DataInput;
import java.io.InputStream;
import java.net.InetAddress;
import java.nio.ByteBuffer;
/**
* Demo of a client which connects to a server ({@link PubServer}) and sends it messages which are forwarded to all
* connected clients
* @author Bela Ban
* @since 3.6.5
*/
public class PubClient implements Receiver, ConnectionListener {
protected BaseServer client;
protected final String name;
protected volatile boolean running=true;
protected InputStream in;
public PubClient(String name) {
this.name=name;
}
@Override
public void receive(Address sender, ByteBuffer buf) {
byte[] buffer=buf.array();
int len=Bits.readInt(buffer, buf.arrayOffset());
String msg=new String(buffer, buf.arrayOffset()+Global.INT_SIZE, len);
System.out.printf("-- %s\n", msg);
}
@Override
public void receive(Address sender, byte[] buf, int offset, int length) {
int len=Bits.readInt(buf, offset);
String msg=new String(buf, offset+Global.INT_SIZE, len);
System.out.printf("-- %s\n", msg);
}
@Override public void receive(Address sender, DataInput in) throws Exception {
int len=in.readInt();
byte[] buf=new byte[len];
in.readFully(buf);
String msg=new String(buf, 0, buf.length);
System.out.printf("-- %s\n", msg);
}
@Override
public void connectionClosed(Connection conn) {
client.stop();
running=false;
Util.close(in);
System.out.printf("connection to %s closed", conn.peerAddress());
}
@Override
public void connectionEstablished(Connection conn) {
}
protected void start(InetAddress srv_addr, int srv_port, boolean nio) throws Exception {
client=nio? new NioClient(InetAddress.getLocalHost(), 0, srv_addr, srv_port)
: new TcpClient(InetAddress.getLocalHost(), 0, srv_addr, srv_port);
client.receiver(this);
client.addConnectionListener(this);
client.start();
send(String.format("%s joined", name));
eventLoop();
client.stop();
}
protected void eventLoop() {
in=new BufferedInputStream(System.in);
while(running) {
try {
System.out.print("> "); System.out.flush();
String line=Util.readLine(in);
if(line == null)
break;
if(line.startsWith("quit") || line.startsWith("exit")) {
break;
}
send(String.format("%s: %s", name, line));
}
catch(Exception e) {
e.printStackTrace();
break;
}
}
}
protected void send(String str) throws Exception {
byte[] buf=str.getBytes();
byte[] data=new byte[Global.INT_SIZE + buf.length];
Bits.writeInt(buf.length, data, 0);
System.arraycopy(buf, 0, data, Global.INT_SIZE, buf.length);
((Client)client).send(data, 0, data.length);
}
public static void main(String[] args) throws Exception {
InetAddress server_addr=InetAddress.getLocalHost();
int server_port=7500;
String name=null;
boolean nio=true;
for(int i=0; i < args.length; i++) {
if(args[i].equals("-addr")) {
server_addr=InetAddress.getByName(args[++i]);
continue;
}
if(args[i].equals("-port")) {
server_port=Integer.parseInt(args[++i]);
continue;
}
if(args[i].equals("-name")) {
name=args[++i];
continue;
}
if(args[i].equals("-nio")) {
nio=Boolean.parseBoolean(args[++i]);
continue;
}
help();
return;
}
if(name == null)
throw new IllegalStateException("name needs to be defined");
PubClient client=new PubClient(name);
client.start(server_addr, server_port, nio);
}
protected static void help() {
System.out.println("PubClient -name name [-addr ] [-port ] [-nio true|false]");
}
}