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#include "services.h"
#include <library/cpp/actors/core/actorsystem.h>
#include <library/cpp/actors/core/hfunc.h>
#include <library/cpp/actors/core/interconnect.h>
#include <util/generic/set.h>
#include <util/generic/hash_set.h>
#include <util/generic/vector.h>
class TExampleReplicaActor : public TActor<TExampleReplicaActor> {
using TOwnerIndex = TMap<TActorId, ui32, TActorId::TOrderedCmp>;
using TKeyIndex = THashMap<TString, TSet<ui32>>;
struct TEntry {
TString Payload;
TActorId Owner;
TOwnerIndex::iterator OwnerIt;
TKeyIndex::iterator KeyIt;
};
TVector<TEntry> Entries;
TVector<ui32> AvailableEntries;
TOwnerIndex IndexOwner;
TKeyIndex IndexKey;
ui32 AllocateEntry() {
ui32 ret;
if (AvailableEntries) {
ret = AvailableEntries.back();
AvailableEntries.pop_back();
}
else {
ret = Entries.size();
Entries.emplace_back();
}
return ret;
}
bool IsLastEntryOnNode(TOwnerIndex::iterator ownerIt) {
const ui32 ownerNodeId = ownerIt->first.NodeId();
if (ownerIt != IndexOwner.begin()) {
auto x = ownerIt;
--x;
if (x->first.NodeId() == ownerNodeId)
return false;
}
++ownerIt;
if (ownerIt != IndexOwner.end()) {
if (ownerIt->first.NodeId() == ownerNodeId)
return false;
}
return true;
}
void CleanupEntry(ui32 entryIndex) {
TEntry &entry = Entries[entryIndex];
entry.KeyIt->second.erase(entryIndex);
if (entry.KeyIt->second.empty())
IndexKey.erase(entry.KeyIt);
if (IsLastEntryOnNode(entry.OwnerIt))
Send(TlsActivationContext->ExecutorThread.ActorSystem->InterconnectProxy(entry.OwnerIt->first.NodeId()), new TEvents::TEvUnsubscribe());
IndexOwner.erase(entry.OwnerIt);
TString().swap(entry.Payload);
entry.Owner = TActorId();
entry.KeyIt = IndexKey.end();
entry.OwnerIt = IndexOwner.end();
AvailableEntries.emplace_back(entryIndex);
}
void Handle(TEvExample::TEvReplicaLookup::TPtr &ev) {
auto &record = ev->Get()->Record;
const auto &key = record.GetKey();
auto keyIt = IndexKey.find(key);
if (keyIt == IndexKey.end()) {
Send(ev->Sender, new TEvExample::TEvReplicaInfo(key), 0, ev->Cookie);
return;
}
auto reply = MakeHolder<TEvExample::TEvReplicaInfo>(key);
reply->Record.MutablePayload()->Reserve(keyIt->second.size());
for (ui32 entryIndex : keyIt->second) {
const TEntry &entry = Entries[entryIndex];
reply->Record.AddPayload(entry.Payload);
}
Send(ev->Sender, std::move(reply), 0, ev->Cookie);
}
void Handle(TEvExample::TEvReplicaPublish::TPtr &ev) {
auto &record = ev->Get()->Record;
const TString &key = record.GetKey();
const TString &payload = record.GetPayload();
const TActorId &owner = ev->Sender;
auto ownerIt = IndexOwner.find(owner);
if (ownerIt != IndexOwner.end()) {
const ui32 entryIndex = ownerIt->second;
TEntry &entry = Entries[entryIndex];
if (entry.KeyIt->first != key) {
// reply nothing, request suspicious
return;
}
entry.Payload = payload;
}
else {
const ui32 entryIndex = AllocateEntry();
TEntry &entry = Entries[entryIndex];
entry.Payload = payload;
entry.Owner = owner;
entry.OwnerIt = IndexOwner.emplace(owner, entryIndex).first;
entry.KeyIt = IndexKey.emplace(std::make_pair(key, TSet<ui32>())).first;
entry.KeyIt->second.emplace(entryIndex);
Send(owner, new TEvExample::TEvReplicaPublishAck(), IEventHandle::FlagTrackDelivery | IEventHandle::FlagSubscribeOnSession, ev->Cookie);
}
}
void Handle(TEvents::TEvUndelivered::TPtr &ev) {
auto ownerIt = IndexOwner.find(ev->Sender);
if (ownerIt == IndexOwner.end())
return;
CleanupEntry(ownerIt->second);
}
void Handle(TEvInterconnect::TEvNodeDisconnected::TPtr &ev) {
auto *msg = ev->Get();
const ui32 nodeId = msg->NodeId;
auto ownerIt = IndexOwner.lower_bound(TActorId(nodeId, 0, 0, 0));
while (ownerIt != IndexOwner.end() && ownerIt->first.NodeId() == nodeId) {
const ui32 idx = ownerIt->second;
++ownerIt;
CleanupEntry(idx);
}
}
public:
static constexpr IActor::EActivityType ActorActivityType() {
// define app-specific activity tag to track elapsed cpu | handled events | actor count in Solomon
return EActorActivity::ACTORLIB_COMMON;
}
TExampleReplicaActor()
: TActor(&TThis::StateWork)
{}
STFUNC(StateWork) {
switch (ev->GetTypeRewrite()) {
hFunc(TEvExample::TEvReplicaLookup, Handle);
hFunc(TEvExample::TEvReplicaPublish, Handle);
hFunc(TEvents::TEvUndelivered, Handle);
hFunc(TEvInterconnect::TEvNodeDisconnected, Handle);
IgnoreFunc(TEvInterconnect::TEvNodeConnected);
default:
// here is place to spam some log message on unknown events
break;
}
}
};
IActor* CreateReplica() {
return new TExampleReplicaActor();
}
TActorId MakeReplicaId(ui32 nodeid) {
char x[12] = { 'r', 'p', 'l' };
memcpy(x + 5, &nodeid, sizeof(ui32));
return TActorId(nodeid, TStringBuf(x, 12));
}
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