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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "gid_to_lid_change_handler.h"
#include "i_gid_to_lid_change_listener.h"
#include "pending_gid_to_lid_changes.h"
#include <vespa/vespalib/util/lambdatask.h>
#include <cassert>
#include <vespa/vespalib/stllike/hash_map.hpp>
using vespalib::makeLambdaTask;
namespace proton {
GidToLidChangeHandler::GidToLidChangeHandler()
: _lock(),
_listeners(),
_closed(false),
_pendingRemove(),
_pending_changes()
{
}
GidToLidChangeHandler::~GidToLidChangeHandler()
{
assert(_closed);
assert(_listeners.empty());
assert(_pendingRemove.empty());
}
void
GidToLidChangeHandler::notifyPutDone(IDestructorCallbackSP context, GlobalId gid, uint32_t lid)
{
for (const auto &listener : _listeners) {
listener->notifyPutDone(context, gid, lid);
}
}
void
GidToLidChangeHandler::notifyRemove(IDestructorCallbackSP context, GlobalId gid)
{
for (const auto &listener : _listeners) {
listener->notifyRemove(context, gid);
}
}
void
GidToLidChangeHandler::notifyPut(IDestructorCallbackSP context, GlobalId gid, uint32_t lid, SerialNum serial_num)
{
lock_guard guard(_lock);
_pending_changes.emplace_back(std::move(context), gid, lid, serial_num, false);
}
void
GidToLidChangeHandler::notifyPutDone(IDestructorCallbackSP context, GlobalId gid, uint32_t lid, SerialNum serialNum)
{
lock_guard guard(_lock);
auto itr = _pendingRemove.find(gid);
if (itr != _pendingRemove.end()) {
auto &entry = itr->second;
assert(entry.removeSerialNum != serialNum);
if (entry.removeSerialNum > serialNum) {
return; // Document has already been removed later on
}
assert(entry.putSerialNum != serialNum);
if (entry.putSerialNum > serialNum) {
return; // Document has already been put later on
}
entry.putSerialNum = serialNum;
}
notifyPutDone(std::move(context), gid, lid);
}
void
GidToLidChangeHandler::notifyRemoves(IDestructorCallbackSP context, const std::vector<GlobalId> & gids, SerialNum serialNum)
{
lock_guard guard(_lock);
_pending_changes.reserve(vespalib::roundUp2inN(_pending_changes.size() + gids.size()));
for (const GlobalId & gid : gids) {
auto insRes = _pendingRemove.insert(std::make_pair(gid, PendingRemoveEntry(serialNum)));
if (!insRes.second) {
auto &entry = insRes.first->second;
assert(entry.removeSerialNum < serialNum);
assert(entry.putSerialNum < serialNum);
if (entry.removeSerialNum < entry.putSerialNum) {
notifyRemove(std::move(context), gid);
}
entry.removeSerialNum = serialNum;
++entry.refCount;
} else {
notifyRemove(std::move(context), gid);
}
_pending_changes.emplace_back(IDestructorCallbackSP(), gid, 0, serialNum, true);
}
}
void
GidToLidChangeHandler::notifyRemoveDone(GlobalId gid, SerialNum serialNum)
{
lock_guard guard(_lock);
auto itr = _pendingRemove.find(gid);
assert(itr != _pendingRemove.end());
auto &entry = itr->second;
assert(entry.removeSerialNum >= serialNum);
if (entry.refCount == 1) {
_pendingRemove.erase(itr);
} else {
--entry.refCount;
}
}
std::unique_ptr<IPendingGidToLidChanges>
GidToLidChangeHandler::grab_pending_changes()
{
lock_guard guard(_lock);
if (_pending_changes.empty()) {
return {};
}
return std::make_unique<PendingGidToLidChanges>(*this, std::move(_pending_changes));
}
void
GidToLidChangeHandler::close()
{
Listeners deferredDelete;
{
lock_guard guard(_lock);
_closed = true;
_listeners.swap(deferredDelete);
}
}
void
GidToLidChangeHandler::addListener(std::unique_ptr<IGidToLidChangeListener> listener)
{
lock_guard guard(_lock);
if (!_closed) {
const vespalib::string &docTypeName = listener->getDocTypeName();
const vespalib::string &name = listener->getName();
for (const auto &oldlistener : _listeners) {
if (oldlistener->getDocTypeName() == docTypeName && oldlistener->getName() == name) {
return;
}
}
_listeners.emplace_back(std::move(listener));
std::vector<GlobalId> removes;
for (auto& change : _pending_changes) {
if (change.is_remove()) {
removes.emplace_back(change.get_gid());
}
}
_listeners.back()->notifyRegistered(removes);
} else {
assert(_listeners.empty());
}
}
namespace {
bool shouldRemoveListener(const IGidToLidChangeListener &listener,
const vespalib::string &docTypeName,
const std::set<vespalib::string> &keepNames)
{
return ((listener.getDocTypeName() == docTypeName) &&
(keepNames.find(listener.getName()) == keepNames.end()));
}
}
void
GidToLidChangeHandler::removeListeners(const vespalib::string &docTypeName,
const std::set<vespalib::string> &keepNames)
{
Listeners deferredDelete;
{
lock_guard guard(_lock);
if (!_closed) {
auto itr = _listeners.begin();
while (itr != _listeners.end()) {
if (shouldRemoveListener(**itr, docTypeName, keepNames)) {
deferredDelete.emplace_back(std::move(*itr));
itr = _listeners.erase(itr);
} else {
++itr;
}
}
} else {
assert(_listeners.empty());
}
}
}
} // namespace proton
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