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// Copyright Vespa.ai. 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/vespalib/util/size_literals.h>
#include <vespa/fnet/frt/supervisor.h>
#include <vespa/fnet/transport.h>
#include <vespa/log/log.h>
LOG_SETUP(".config.frt.frtconnectionpool");
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(FNET_Transport & transport, const ServerSpec & spec, const TimingValues & timingValues)
: _supervisor(std::make_unique<FRT_Supervisor>(& transport)),
_selectIdx(0),
_hostname("")
{
for (size_t i(0); i < spec.numHosts(); i++) {
FRTConnectionKey key(i, spec.getHost(i));
_connections[key] = std::make_shared<FRTConnection>(spec.getHost(i), *_supervisor, timingValues);
}
setHostname();
}
FRTConnectionPool::~FRTConnectionPool() {
LOG(debug, "Shutting down %lu connections", _connections.size());
syncTransport();
_connections.clear();
syncTransport();
}
void
FRTConnectionPool::syncTransport()
{
_supervisor->GetTransport()->sync();
}
Connection *
FRTConnectionPool::getCurrent()
{
if (_hostname.compare("") == 0) {
return getNextRoundRobin();
} else {
return getNextHashBased();
}
}
FRTConnection *
FRTConnectionPool::getNextRoundRobin()
{
auto ready = getReadySources();
auto suspended = getSuspendedSources();
FRTConnection* nextFRTConnection = nullptr;
if ( ! ready.empty()) {
unsigned int sel = _selectIdx % (int)ready.size();
LOG_ASSERT(sel < ready.size());
_selectIdx = sel + 1;
nextFRTConnection = ready[sel];
} else if ( ! suspended.empty()) {
unsigned int sel = _selectIdx % (int)suspended.size();
LOG_ASSERT(sel < suspended.size());
_selectIdx = sel + 1;
nextFRTConnection = suspended[sel];
}
return nextFRTConnection;
}
namespace {
/**
* Implementation of the Java hashCode function for the String class.
*
* Ensures that the same hostname maps to the same configserver/proxy
* for both language implementations.
*
* @param s the string to compute the hash from
* @return the hash value
*/
int hashCode(const vespalib::string & s) {
unsigned int hashval = 0;
for (int i = 0; i < (int) s.length(); i++) {
hashval = 31 * hashval + s[i];
}
return hashval;
}
}
FRTConnection *
FRTConnectionPool::getNextHashBased()
{
auto ready = getReadySources();
auto suspended = getSuspendedSources();
FRTConnection* nextFRTConnection = nullptr;
if ( ! ready.empty()) {
unsigned int sel = std::abs(hashCode(_hostname) % (int)ready.size());
LOG_ASSERT(sel < ready.size());
nextFRTConnection = ready[sel];
} else if ( ! suspended.empty() ){
unsigned int sel = std::abs(hashCode(_hostname) % (int)suspended.size());
LOG_ASSERT(sel < suspended.size());
nextFRTConnection = suspended[sel];
}
return nextFRTConnection;
}
std::vector<FRTConnection *>
FRTConnectionPool::getReadySources() const
{
std::vector<FRTConnection*> readySources;
auto timestamp = vespalib::steady_clock::now();
for (const auto & entry : _connections) {
FRTConnection* source = entry.second.get();
if (source->getSuspendedUntil() < timestamp) {
readySources.push_back(source);
}
}
return readySources;
}
std::vector<FRTConnection *>
FRTConnectionPool::getSuspendedSources() const
{
std::vector<FRTConnection*> suspendedSources;
auto timestamp = vespalib::steady_clock::now();
for (const auto & entry : _connections) {
FRTConnection* source = entry.second.get();
if (source->getSuspendedUntil() >= timestamp) {
suspendedSources.push_back(source);
}
}
return suspendedSources;
}
void
FRTConnectionPool::setHostname()
{
setHostname(vespalib::HostName::get());
}
FNET_Scheduler *
FRTConnectionPool::getScheduler() {
return _supervisor->GetScheduler();
}
FRTConnectionPoolWithTransport::FRTConnectionPoolWithTransport(std::unique_ptr<FNET_Transport> transport,
const ServerSpec & spec, const TimingValues & timingValues)
: _transport(std::move(transport)),
_connectionPool(std::make_unique<FRTConnectionPool>(*_transport, spec, timingValues))
{
_transport->Start();
}
FRTConnectionPoolWithTransport::~FRTConnectionPoolWithTransport()
{
syncTransport();
_transport->ShutDown(true);
}
}
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