public void markServerDown(String id) {
boolean triggered = false;
id = Server.normalizeId(id);
if (id == null) {
return;
}
Lock writeLock = upServerLock.writeLock();
try {
writeLock.lock();
final List<Server> changedServers = new ArrayList<Server>();
for (Server svr : upServerList) {
if (svr.isAlive() && (svr.getId().equals(id))) {
triggered = true;
svr.setAlive(false);
changedServers.add(svr);
}
}
if (triggered) {
logger.error("LoadBalancer: markServerDown called on [" + id + "]");
notifyServerStatusChangeListener(changedServers);
}
} finally {
try {
writeLock.unlock();
} catch (Exception e) { // NOPMD
}
}
}
@Override
public void markServerDown(Server server) {
if (server == null) {
return;
}
if (!server.isAlive()) {
return;
}
logger.error("LoadBalancer: markServerDown called on [" + server.getId() + "]");
server.setAlive(false);
// forceQuickPing();
notifyServerStatusChangeListener(singleton(server));
}
public Server choose(ILoadBalancer lb, Object key) {
if (lb == null) {
log.warn("no load balancer");
return null;
}
Server server = null;
int index = 0;
int count = 0;
while (server == null && count++ < 10) {
List<Server> upList = lb.getServerList(true);
List<Server> allList = lb.getServerList(false);
int upCount = upList.size();
int serverCount = allList.size();
if ((upCount == 0) || (serverCount == 0)) {
log.warn("No up servers available from load balancer: " + lb);
return null;
}
index = nextIndexAI.incrementAndGet() % serverCount;
server = allList.get(index);
if (server == null) {
/* Transient. */
Thread.yield();
continue;
}
if (server.isAlive() && (server.isReadyToServe())) {
return (server);
}
// Next.
server = null;
}
if (count >= 10) {
log.warn("No available alive servers after 10 tries from load balancer: " + lb);
}
return server;
}
public void runPinger() {
if (pingInProgress.get()) {
return;
} else {
pingInProgress.set(true);
}
Object[] allServers = null;
boolean[] results = null;
Lock allLock = null;
Lock upLock = null;
try {
allLock = allServerLock.readLock();
allLock.lock();
allServers = allServerList.toArray();
allLock.unlock();
int numCandidates = allServers.length;
results = new boolean[numCandidates];
if (logger.isDebugEnabled()) {
logger.debug(
"LoadBalancer: PingTask executing [" + numCandidates + "] servers configured");
}
for (int i = 0; i < numCandidates; i++) {
results[i] = false;
try {
if (ping != null) {
results[i] = ping.isAlive((Server) allServers[i]);
}
} catch (Throwable t) {
logger.error("Exception while pinging Server:" + allServers[i], t);
}
}
final List<Server> newUpList = new ArrayList<Server>();
final List<Server> changedServers = new ArrayList<Server>();
for (int i = 0; i < numCandidates; i++) {
boolean isAlive = results[i];
Server svr = (Server) allServers[i];
boolean oldIsAlive = svr.isAlive();
svr.setAlive(isAlive);
if (oldIsAlive != isAlive) {
changedServers.add(svr);
if (logger.isDebugEnabled()) {
logger.debug(
"LoadBalancer: Server ["
+ svr.getId()
+ "] status changed to "
+ (isAlive ? "ALIVE" : "DEAD"));
}
}
if (isAlive) {
newUpList.add(svr);
}
}
upLock = upServerLock.writeLock();
upLock.lock();
upServerList = newUpList;
upLock.unlock();
notifyServerStatusChangeListener(changedServers);
} catch (Throwable t) {
logger.error("Throwable caught while running the Pinger-" + name, t);
} finally {
pingInProgress.set(false);
}
}
