org.jgroups.demos.CounterServiceDemo 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.JChannel;
import org.jgroups.ReceiverAdapter;
import org.jgroups.View;
import org.jgroups.blocks.atomic.Counter;
import org.jgroups.blocks.atomic.CounterService;
import org.jgroups.util.Util;
public class CounterServiceDemo {
static final String props="SHARED_LOOPBACK:PING(timeout=1000):" +
"pbcast.NAKACK(use_mcast_xmit=false;log_discard_msgs=false;log_not_found_msgs=false)" +
":UNICAST:pbcast.STABLE(stability_delay=200):pbcast.GMS:FC:FRAG2:COUNTER";
protected JChannel ch;
void start(String props, String channel_name) throws Exception {
ch=new JChannel(props);
ch.setName(channel_name);
ch.setReceiver(new ReceiverAdapter() {
public void viewAccepted(View view) {
System.out.println("-- view: " + view);
}
});
loop();
}
public void start(JChannel ch) throws Exception {
this.ch=ch;
ch.setReceiver(new ReceiverAdapter() {
public void viewAccepted(View view) {
System.out.println("-- view: " + view);
}
});
loop();
}
void loop() throws Exception {
CounterService counter_service=new CounterService(ch);
ch.connect("counter-cluster");
Counter counter=counter_service.getOrCreateCounter("mycounter", 1);
boolean looping=true;
while(looping) {
try {
int key=Util.keyPress("[1] Increment [2] Decrement [3] Compare and set\n" +
"[4] Create counter [5] Delete counter\n" +
"[6] Print counters [7] Get counter\n" +
"[8] Increment 1M times [9] Dump pending requests [x] Exit\n");
switch(key) {
case '1':
long val=counter.incrementAndGet();
System.out.println("counter: " + val);
break;
case '2':
val=counter.decrementAndGet();
System.out.println("counter: " + val);
break;
case '3':
long expect=Util.readLongFromStdin("expected value: ");
long update=Util.readLongFromStdin("update: ");
if(counter.compareAndSet(expect, update)) {
System.out.println("-- set counter \"" + counter.getName() + "\" to " + update + "\n");
}
else {
System.err.println("failed setting counter \"" + counter.getName() + "\" from " + expect +
" to " + update + ", current value is " + counter.get() + "\n");
}
break;
case '4':
String counter_name=Util.readStringFromStdin("counter name: ");
counter=counter_service.getOrCreateCounter(counter_name, 1);
break;
case '5':
counter_name=Util.readStringFromStdin("counter name: ");
counter_service.deleteCounter(counter_name);
break;
case '6':
System.out.println("Counters (current=" + counter.getName() + "):\n\n" + counter_service.printCounters());
break;
case '7':
counter.get();
break;
case '8':
int NUM=Util.readIntFromStdin("num: ");
System.out.println("");
int print=NUM / 10;
long retval=0;
long start=System.currentTimeMillis();
for(int i=0; i < NUM; i++) {
retval=counter.incrementAndGet();
if(i > 0 && i % print == 0)
System.out.println("-- count=" + retval);
}
long diff=System.currentTimeMillis() - start;
System.out.println("\n" + NUM + " incrs took " + diff + " ms; " + (NUM / (diff / 1000.0)) + " ops /sec\n");
break;
case '9':
System.out.println("Pending requests:\n" + counter_service.dumpPendingRequests());
break;
case 'x':
looping=false;
break;
}
}
catch(Throwable t) {
System.err.println(t);
}
}
Util.close(ch);
}
public static void main(final String[] args) throws Exception {
String properties=props;
String name=null;
for(int i=0; i < args.length; i++) {
if(args[i].equals("-props")) {
properties=args[++i];
continue;
}
if(args[i].equals("-name")) {
name=args[++i];
continue;
}
help();
return;
}
new CounterServiceDemo().start(properties, name);
}
private static void help() {
System.out.println("CounterServiceDemo [-props props] [-name name]");
}
}