private boolean shutdown(long timeout, TimeUnit unit) throws InterruptedException {
if (!isShutdown.compareAndSet(false, true)) return true;
long start = System.nanoTime();
boolean success = true;
for (HostConnectionPool pool : pools.values())
success &= pool.shutdown(timeout - Cluster.timeSince(start, unit), unit);
return success;
}
private boolean discardAvailableConnections(long timeout, TimeUnit unit)
throws InterruptedException {
long start = System.nanoTime();
boolean success = true;
for (Connection connection : connections) {
success &= connection.close(timeout - Cluster.timeSince(start, unit), unit);
open.decrementAndGet();
}
return success;
}
/*
* When the set of live nodes change, the loadbalancer will change his
* mind on host distances. It might change it on the node that came/left
* but also on other nodes (for instance, if a node dies, another
* previously ignored node may be now considered).
*
* This method ensures that all hosts for which a pool should exist
* have one, and hosts that shouldn't don't.
*/
private void updateCreatedPools() {
for (Host h : cluster.getMetadata().allHosts()) {
HostDistance dist = loadBalancingPolicy().distance(h);
HostConnectionPool pool = pools.get(h);
if (pool == null) {
if (dist != HostDistance.IGNORED && h.getMonitor().isUp()) addOrRenewPool(h);
} else if (dist != pool.hostDistance) {
if (dist == HostDistance.IGNORED) {
removePool(h);
} else {
pool.hostDistance = dist;
}
}
}
}
public void onDown(Host host) {
loadBalancer.onDown(host);
HostConnectionPool pool = pools.remove(host);
// This should not be necessary but it's harmless
if (pool != null) pool.shutdown();
// If we've remove a host, the loadBalancer is allowed to change his mind on host distances.
for (Host h : cluster.getMetadata().allHosts()) {
if (!h.getMonitor().isUp()) continue;
HostDistance dist = loadBalancer.distance(h);
if (dist != HostDistance.IGNORED) {
HostConnectionPool p = pools.get(h);
if (p == null) addHost(host);
else p.hostDistance = dist;
}
}
}
private Connection waitForConnection(long timeout, TimeUnit unit)
throws ConnectionException, TimeoutException {
long start = System.nanoTime();
long remaining = timeout;
do {
try {
awaitAvailableConnection(remaining, unit);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
// If we're interrupted fine, check if there is a connection available but stop waiting
// otherwise
timeout = 0; // this will make us stop the loop if we don't get a connection right away
}
if (isShutdown()) throw new ConnectionException(host.getAddress(), "Pool is shutdown");
int minInFlight = Integer.MAX_VALUE;
Connection leastBusy = null;
for (Connection connection : connections) {
int inFlight = connection.inFlight.get();
if (inFlight < minInFlight) {
minInFlight = inFlight;
leastBusy = connection;
}
}
while (true) {
int inFlight = leastBusy.inFlight.get();
if (inFlight >= Connection.MAX_STREAM_PER_CONNECTION) break;
if (leastBusy.inFlight.compareAndSet(inFlight, inFlight + 1)) return leastBusy;
}
remaining = timeout - Cluster.timeSince(start, unit);
} while (remaining > 0);
throw new TimeoutException();
}