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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "frtconnectionpool.h"
#include <vespa/vespalib/util/host_name.h>
#include <vespa/fnet/frt/supervisor.h>
#include <vespa/fnet/transport.h>
namespace config {
FRTConnectionPool::FRTConnectionKey::FRTConnectionKey(int idx, const vespalib::string& hostname)
: _idx(idx),
_hostname(hostname)
{
}
int
FRTConnectionPool::FRTConnectionKey::operator<(const FRTConnectionPool::FRTConnectionKey& right) const
{
return _idx < right._idx;
}
int
FRTConnectionPool::FRTConnectionKey::operator==(const FRTConnectionKey& right) const
{
return _hostname == right._hostname;
}
FRTConnectionPool::FRTConnectionPool(const ServerSpec & spec, const TimingValues & timingValues)
: _supervisor(std::make_unique<FRT_Supervisor>()),
_selectIdx(0),
_hostname("")
{
for (size_t i(0); i < spec.numHosts(); i++) {
FRTConnectionKey key(i, spec.getHost(i));
_connections[key].reset(new FRTConnection(spec.getHost(i), *_supervisor, timingValues));
}
setHostname();
_supervisor->Start();
}
FRTConnectionPool::~FRTConnectionPool()
{
_supervisor->ShutDown(true);
}
void
FRTConnectionPool::syncTransport()
{
_supervisor->GetTransport()->sync();
}
Connection *
FRTConnectionPool::getCurrent()
{
if (_hostname.compare("") == 0) {
return getNextRoundRobin();
} else {
return getNextHashBased();
}
}
FRTConnection *
FRTConnectionPool::getNextRoundRobin()
{
std::vector<FRTConnection *> readySources;
getReadySources(readySources);
std::vector<FRTConnection *> suspendedSources;
getSuspendedSources(suspendedSources);
FRTConnection* nextFRTConnection = NULL;
if (!readySources.empty()) {
int sel = _selectIdx % (int)readySources.size();
_selectIdx = sel + 1;
nextFRTConnection = readySources[sel];
} else if (!suspendedSources.empty()) {
int sel = _selectIdx % (int)suspendedSources.size();
_selectIdx = sel + 1;
nextFRTConnection = suspendedSources[sel];
}
return nextFRTConnection;
}
FRTConnection *
FRTConnectionPool::getNextHashBased()
{
std::vector<FRTConnection*> readySources;
getReadySources(readySources);
std::vector<FRTConnection*> suspendedSources;
getSuspendedSources(suspendedSources);
FRTConnection* nextFRTConnection = NULL;
if (!readySources.empty()) {
int sel = std::abs(hashCode(_hostname) % (int)readySources.size());
nextFRTConnection = readySources[sel];
} else {
int sel = std::abs(hashCode(_hostname) % (int)suspendedSources.size());
nextFRTConnection = suspendedSources[sel];
}
return nextFRTConnection;
}
const std::vector<FRTConnection *> &
FRTConnectionPool::getReadySources(std::vector<FRTConnection*> & readySources) const
{
readySources.clear();
for (ConnectionMap::const_iterator iter = _connections.begin(); iter != _connections.end(); iter++) {
FRTConnection* source = iter->second.get();
int64_t tnow = time(0);
tnow *= 1000;
int64_t timestamp = tnow;
if (source->getSuspendedUntil() < timestamp) {
readySources.push_back(source);
}
}
return readySources;
}
const std::vector<FRTConnection *> &
FRTConnectionPool::getSuspendedSources(std::vector<FRTConnection*> & suspendedSources) const
{
suspendedSources.clear();
for (ConnectionMap::const_iterator iter = _connections.begin(); iter != _connections.end(); iter++) {
FRTConnection* source = iter->second.get();
int64_t tnow = time(0);
tnow *= 1000;
int64_t timestamp = tnow;
if (source->getSuspendedUntil() >= timestamp) {
suspendedSources.push_back(source);
}
}
return suspendedSources;
}
int FRTConnectionPool::hashCode(const vespalib::string & s)
{
int hashval = 0;
for (int i = 0; i < (int)s.length(); i++) {
hashval = 31 * hashval + s[i];
}
return hashval;
}
void
FRTConnectionPool::setHostname()
{
_hostname = vespalib::HostName::get();
}
FNET_Scheduler *
FRTConnectionPool::getScheduler() {
return _supervisor->GetScheduler();
}
}
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