hardcoresushi/libcryfs
1
0
Fork 0
Code Issues Pull Requests Releases Activity

Replace unique_ptr with unique_ref

Browse Source
This commit is contained in:
Sebastian Messmer 2015-06-26 13:44:12 +02:00
parent 39e17b8015
commit 0faa63b7b4
2 changed files with 30 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
ParallelAccessBaseStore.h
View File

@ -1,7 +1,8 @@
#ifndef MESSMER_PARALLELACCESSSTORE_PARALLELACCESSBASESTORE_H_
#define MESSMER_PARALLELACCESSSTORE_PARALLELACCESSBASESTORE_H_
#include <memory>
#include <messmer/cpp-utils/pointer/unique_ref.h>
#include <boost/optional.hpp>
namespace parallelaccessstore {
@ -9,8 +10,8 @@ template<class Resource, class Key>
class ParallelAccessBaseStore {
public:
virtual ~ParallelAccessBaseStore() {}
virtual std::unique_ptr<Resource> loadFromBaseStore(const Key &key) = 0;
virtual void removeFromBaseStore(std::unique_ptr<Resource> block) = 0;
virtual boost::optional<cpputils::unique_ref<Resource>> loadFromBaseStore(const Key &key) = 0;
virtual void removeFromBaseStore(cpputils::unique_ref<Resource> block) = 0;
};
}

52
ParallelAccessStore.h
View File

@ -20,7 +20,7 @@ namespace parallelaccessstore {
template<class Resource, class ResourceRef, class Key>
class ParallelAccessStore {
public:
explicit ParallelAccessStore(std::unique_ptr<ParallelAccessBaseStore<Resource, Key>> baseStore);
explicit ParallelAccessStore(cpputils::unique_ref<ParallelAccessBaseStore<Resource, Key>> baseStore);
class ResourceRefBase {
public:
@ -39,14 +39,14 @@ public:
Key _key;
};
std::unique_ptr<ResourceRef> add(const Key &key, std::unique_ptr<Resource> resource);
std::unique_ptr<ResourceRef> load(const Key &key);
void remove(const Key &key, std::unique_ptr<ResourceRef> block);
cpputils::unique_ref<ResourceRef> add(const Key &key, cpputils::unique_ref<Resource> resource);
boost::optional<cpputils::unique_ref<ResourceRef>> load(const Key &key);
void remove(const Key &key, cpputils::unique_ref<ResourceRef> block);
private:
class OpenResource {
public:
OpenResource(std::unique_ptr<Resource> resource): _resource(std::move(resource)), _refCount(0) {}
OpenResource(cpputils::unique_ref<Resource> resource): _resource(std::move(resource)), _refCount(0) {}
Resource *getReference() {
++_refCount;
@ -61,22 +61,22 @@ private:
return 0 == _refCount;
}
std::unique_ptr<Resource> moveResourceOut() {
cpputils::unique_ref<Resource> moveResourceOut() {
return std::move(_resource);
}
private:
std::unique_ptr<Resource> _resource;
cpputils::unique_ref<Resource> _resource;
uint32_t _refCount;
};
std::mutex _mutex;
std::unique_ptr<ParallelAccessBaseStore<Resource, Key>> _baseStore;
cpputils::unique_ref<ParallelAccessBaseStore<Resource, Key>> _baseStore;
std::unordered_map<Key, OpenResource> _openResources;
std::map<Key, std::promise<std::unique_ptr<Resource>>> _resourcesToRemove;
std::map<Key, std::promise<cpputils::unique_ref<Resource>>> _resourcesToRemove;
std::unique_ptr<ResourceRef> _add(const Key &key, std::unique_ptr<Resource> resource);
std::unique_ptr<ResourceRef> _createResourceRef(Resource *resource, const Key &key);
cpputils::unique_ref<ResourceRef> _add(const Key &key, cpputils::unique_ref<Resource> resource);
cpputils::unique_ref<ResourceRef> _createResourceRef(Resource *resource, const Key &key);
void release(const Key &key);
friend class CachedResource;
@ -85,7 +85,7 @@ private:
};
template<class Resource, class ResourceRef, class Key>
ParallelAccessStore<Resource, ResourceRef, Key>::ParallelAccessStore(std::unique_ptr<ParallelAccessBaseStore<Resource, Key>> baseStore)
ParallelAccessStore<Resource, ResourceRef, Key>::ParallelAccessStore(cpputils::unique_ref<ParallelAccessBaseStore<Resource, Key>> baseStore)
: _mutex(),
_baseStore(std::move(baseStore)),
_openResources(),
@ -94,46 +94,46 @@ ParallelAccessStore<Resource, ResourceRef, Key>::ParallelAccessStore(std::unique
}
template<class Resource, class ResourceRef, class Key>
std::unique_ptr<ResourceRef> ParallelAccessStore<Resource, ResourceRef, Key>::add(const Key &key, std::unique_ptr<Resource> resource) {
cpputils::unique_ref<ResourceRef> ParallelAccessStore<Resource, ResourceRef, Key>::add(const Key &key, cpputils::unique_ref<Resource> resource) {
std::lock_guard<std::mutex> lock(_mutex);
return _add(key, std::move(resource));
}
template<class Resource, class ResourceRef, class Key>
std::unique_ptr<ResourceRef> ParallelAccessStore<Resource, ResourceRef, Key>::_add(const Key &key, std::unique_ptr<Resource> resource) {
cpputils::unique_ref<ResourceRef> ParallelAccessStore<Resource, ResourceRef, Key>::_add(const Key &key, cpputils::unique_ref<Resource> resource) {
auto insertResult = _openResources.emplace(key, std::move(resource));
assert(true == insertResult.second);
return _createResourceRef(insertResult.first->second.getReference(), key);
}
template<class Resource, class ResourceRef, class Key>
std::unique_ptr<ResourceRef> ParallelAccessStore<Resource, ResourceRef, Key>::_createResourceRef(Resource *resource, const Key &key) {
auto resourceRef = std::make_unique<ResourceRef>(resource);
cpputils::unique_ref<ResourceRef> ParallelAccessStore<Resource, ResourceRef, Key>::_createResourceRef(Resource *resource, const Key &key) {
auto resourceRef = cpputils::make_unique_ref<ResourceRef>(resource);
resourceRef->init(this, key);
return std::move(resourceRef);
}
template<class Resource, class ResourceRef, class Key>
std::unique_ptr<ResourceRef> ParallelAccessStore<Resource, ResourceRef, Key>::load(const Key &key) {
boost::optional<cpputils::unique_ref<ResourceRef>> ParallelAccessStore<Resource, ResourceRef, Key>::load(const Key &key) {
//TODO This lock doesn't allow loading different blocks in parallel. Can we do something with futures maybe?
std::lock_guard<std::mutex> lock(_mutex);
auto found = _openResources.find(key);
if (found == _openResources.end()) {
auto resource = _baseStore->loadFromBaseStore(key);
if (resource.get() == nullptr) {
return nullptr;
}
return _add(key, std::move(resource));
auto resource = _baseStore->loadFromBaseStore(key);
if (resource == boost::none) {
return boost::none;
}
return _add(key, std::move(*resource));
} else {
return _createResourceRef(found->second.getReference(), key);
return _createResourceRef(found->second.getReference(), key);
}
}
template<class Resource, class ResourceRef, class Key>
void ParallelAccessStore<Resource, ResourceRef, Key>::remove(const Key &key, std::unique_ptr<ResourceRef> resource) {
auto insertResult = _resourcesToRemove.emplace(key, std::promise<std::unique_ptr<Resource>>());
void ParallelAccessStore<Resource, ResourceRef, Key>::remove(const Key &key, cpputils::unique_ref<ResourceRef> resource) {
auto insertResult = _resourcesToRemove.emplace(key, std::promise<cpputils::unique_ref<Resource>>());
assert(true == insertResult.second);
resource.reset();
cpputils::to_unique_ptr(std::move(resource)).reset(); // Call destructor
//Wait for last resource user to release it
auto resourceToRemove = insertResult.first->second.get_future().get();