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// Copyright (C) 2020 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include "base/Lookup.h"
#include "base/EntityManager.h"
#include "base/Lock.h"
#include <unordered_map>
namespace android {
namespace base {
template <size_t maxIndex,
class IndexType, // must be castable to uint64_t
class Data>
class HybridEntityManager {
public:
using EM = EntityManager<32, 16, 16, Data>;
using IterFunc = typename EM::IteratorFunc;
using ConstIterFunc = typename EM::ConstIteratorFunc;
using Handle = typename EM::EntityHandle;
HybridEntityManager() : mEntityManager(maxIndex + 1) { }
~HybridEntityManager() { clear(); }
uint64_t add(const Data& data, size_t type) {
uint64_t nextIndex = 0;
{
SeqLock::ScopedWrite sw(&mEntityManagerLock);
nextIndex = (uint64_t)mEntityManager.nextFreeIndex();
if (nextIndex < maxIndex) {
uint64_t resultHandle = mEntityManager.add(data, type);
if (EM::getHandleIndex(resultHandle) != nextIndex) {
fprintf(stderr, "%s: fatal: handle indices mismatch. wanted 0x%llx got 0x%llx\n", __func__,
(unsigned long long)nextIndex,
(unsigned long long)EM::getHandleIndex(resultHandle));
abort();
}
return resultHandle;
}
}
AutoLock lock(mMapLock);
if (mIndexForMap == 0) {
mIndexForMap = maxIndex;
}
nextIndex = mIndexForMap;
mMap[nextIndex] = data;
++mIndexForMap;
return EM::makeHandle(nextIndex, 1, type);
}
uint64_t addFixed(IndexType index, const Data& data, size_t type) {
uint64_t index_u64 = (uint64_t)EM::getHandleIndex(index);
if (index_u64 < maxIndex) {
SeqLock::ScopedWrite sw(&mEntityManagerLock);
return mEntityManager.addFixed(index, data, type);
} else {
AutoLock lock(mMapLock);
// Fixed allocations require us to update mIndexForMap to catch up with it.
// We assume that addFixed/add for the map case do not interleave badly
// (addFixed at i, add at i+1, addFixed at i+1)
mIndexForMap = index_u64;
mMap[index_u64] = data;
++mIndexForMap;
return index;
}
}
void clear() {
{
SeqLock::ScopedWrite sw(&mEntityManagerLock);
mEntityManager.clear();
}
{
AutoLock lock(mMapLock);
mMap.clear();
mIndexForMap = 0;
}
}
void remove(IndexType index) {
uint64_t index_u64 = (uint64_t)EM::getHandleIndex(index);
if (index_u64 < maxIndex) {
SeqLock::ScopedWrite sw(&mEntityManagerLock);
mEntityManager.remove(index);
} else {
AutoLock lock(mMapLock);
mMap.erase(index_u64);
}
}
Data* get(IndexType index) {
uint64_t index_u64 = (uint64_t)EM::getHandleIndex(index);
if (index_u64 < maxIndex) {
SeqLock::ScopedWrite sw(&mEntityManagerLock);
return mEntityManager.get(index);
} else {
AutoLock lock(mMapLock);
auto res = android::base::find(mMap, index_u64);
return res;
}
}
const Data* get_const(IndexType index) const {
uint64_t index_u64 = (uint64_t)EM::getHandleIndex(index);
if (index_u64 < maxIndex) {
const Data* res;
AEMU_SEQLOCK_READ_WITH_RETRY(&mEntityManagerLock,
res = mEntityManager.get_const(index));
return res;
} else {
AutoLock lock(mMapLock);
auto res = android::base::find(mMap, index_u64);
return res;
}
}
Data* getExceptZero(IndexType index) {
Data* res = get(index);
if (!res) return nullptr;
if (!(*res)) return nullptr;
return res;
}
const Data* getExceptZero_const(IndexType index) const {
const Data* res = get_const(index);
if (!res) return nullptr;
if (!(*res)) return nullptr;
return res;
}
void forEach(IterFunc func) {
{
SeqLock::ScopedWrite sw(&mEntityManagerLock);
mEntityManager.forEach(func);
}
AutoLock lock(mMapLock);
for (auto it : mMap) {
auto handle = index2Handle(it.first);
func(true /* live */, handle, handle, it.second);
}
}
void forEachLive(IterFunc func) {
{
SeqLock::ScopedWrite sw(&mEntityManagerLock);
mEntityManager.forEachLiveComponent(func);
}
AutoLock lock(mMapLock);
for (auto it : mMap) {
auto handle = index2Handle(it.first);
func(true /* live */, handle, handle, it.second);
}
}
void forEachLive_const(ConstIterFunc func) const {
mEntityManager.forEachLiveEntry_const([this, func](bool live, Handle h, Data& d) {
AEMU_SEQLOCK_READ_WITH_RETRY(
&mEntityManagerLock,
func(live, h, d));
});
AutoLock lock(mMapLock);
for (const auto it : mMap) {
auto handle = index2Handle(it.first);
func(true /* live */, handle, handle, it.second);
}
}
private:
static Handle index2Handle(uint64_t index) {
return EM::makeHandle((uint32_t)index, 1, 1);
}
EM mEntityManager;
std::unordered_map<IndexType, Data> mMap;
uint64_t mIndexForMap = 0;
mutable SeqLock mEntityManagerLock;
mutable Lock mMapLock;
};
} // namespace android
} // namespace base
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