package org.jgroups.tests;
import org.jgroups.*;
import org.jgroups.debug.Simulator;
import org.jgroups.protocols.BARRIER;
import org.jgroups.protocols.PING;
import org.jgroups.protocols.VIEW_SYNC;
import org.jgroups.stack.Protocol;
import org.jgroups.util.UUID;
import org.jgroups.util.Util;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;
import java.util.Vector;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Tests the BARRIER protocol
* @author Bela Ban
*/
@Test(groups=Global.FUNCTIONAL, sequential=true)
public class BARRIERTest {
Address a1;
Vector<Address> members;
View v;
Simulator s;
BARRIER barrier_prot=new BARRIER();
PING bottom_prot;
@BeforeMethod
public void setUp() throws Exception {
a1=UUID.randomUUID();
members=new Vector<Address>();
members.add(a1);
v=new View(a1, 1, members);
s=new Simulator();
s.setLocalAddress(a1);
s.setView(v);
s.addMember(a1);
bottom_prot=new PING();
VIEW_SYNC view_sync=new VIEW_SYNC();
Protocol[] stack=new Protocol[]{view_sync, barrier_prot, bottom_prot};
s.setProtocolStack(stack);
s.start();
}
@AfterMethod
public void tearDown() throws Exception {
s.stop();
}
public void testBlocking() {
assert !barrier_prot.isClosed();
s.send(new Event(Event.CLOSE_BARRIER));
assert barrier_prot.isClosed();
s.send(new Event(Event.OPEN_BARRIER));
assert !barrier_prot.isClosed();
}
public void testThreadsBlockedOnBarrier() {
MyReceiver receiver=new MyReceiver();
s.setReceiver(receiver);
s.send(new Event(Event.CLOSE_BARRIER));
for(int i=0; i < 5; i++) {
new Thread() {
public void run() {
bottom_prot.up(new Event(Event.MSG, new Message(null, null, null)));
}
}.start();
}
Util.sleep(2000);
int num_in_flight_threads=barrier_prot.getNumberOfInFlightThreads();
assert num_in_flight_threads == 0;
s.send(new Event(Event.OPEN_BARRIER));
Util.sleep(2000);
num_in_flight_threads=barrier_prot.getNumberOfInFlightThreads();
assert num_in_flight_threads == 0;
int received_msgs=receiver.getNumberOfReceivedMessages();
assert received_msgs == 5 : "expected " + 5 + " messages but got " + received_msgs;
}
public void testThreadsBlockedOnMutex() throws InterruptedException {
BlockingReceiver receiver=new BlockingReceiver();
s.setReceiver(receiver);
Thread thread=new Thread() {
public void run() {bottom_prot.up(new Event(Event.MSG, new Message()));}
};
Thread thread2=new Thread() {
public void run() {bottom_prot.up(new Event(Event.MSG, new Message()));}
};
thread.start();
thread2.start();
thread.join();
thread2.join();
}
static class MyReceiver implements Simulator.Receiver {
AtomicInteger num_mgs_received=new AtomicInteger(0);
public void receive(Event evt) {
if(evt.getType() == Event.MSG) {
if(num_mgs_received.incrementAndGet() % 1000 == 0)
System.out.println("<== " + num_mgs_received.get());
}
}
public int getNumberOfReceivedMessages() {
return num_mgs_received.get();
}
}
class BlockingReceiver implements Simulator.Receiver {
public void receive(Event evt) {
System.out.println("Thread " + Thread.currentThread().getId() + " receive() called - about to enter mutex");
synchronized(this) {
System.out.println("Thread " + Thread.currentThread().getId() + " entered mutex");
Util.sleep(2000);
System.out.println("Thread " + Thread.currentThread().getId() + " closing barrier");
s.send(new Event(Event.CLOSE_BARRIER));
System.out.println("Thread " + Thread.currentThread().getId() + " closed barrier");
}
}
}
}