/*
- * Copyright 2004-present Facebook, Inc.
+ * Copyright 2016-present Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
-#include <folly/io/async/Request.h>
-#include <algorithm>
-#include <stdexcept>
-#include <utility>
+#include <folly/io/async/Request.h>
+#include <folly/tracing/StaticTracepoint.h>
#include <glog/logging.h>
#include <folly/MapUtil.h>
#include <folly/SingletonThreadLocal.h>
-#include <folly/tracing/StaticTracepoint.h>
namespace folly {
+bool RequestContext::doSetContextData(
+ const std::string& val,
+ std::unique_ptr<RequestData>& data,
+ bool strict) {
+ auto ulock = state_.ulock();
+
+ bool conflict = false;
+ auto it = ulock->requestData_.find(val);
+ if (it != ulock->requestData_.end()) {
+ if (strict) {
+ return false;
+ } else {
+ LOG_FIRST_N(WARNING, 1) << "Calling RequestContext::setContextData for "
+ << val << " but it is already set";
+ conflict = true;
+ }
+ }
+
+ auto wlock = ulock.moveFromUpgradeToWrite();
+ if (conflict) {
+ if (it->second) {
+ if (it->second->hasCallback()) {
+ wlock->callbackData_.erase(it->second.get());
+ }
+ it->second.reset(nullptr);
+ }
+ return true;
+ }
+
+ if (data && data->hasCallback()) {
+ wlock->callbackData_.insert(data.get());
+ }
+ wlock->requestData_[val] = std::move(data);
+
+ return true;
+}
+
void RequestContext::setContextData(
const std::string& val,
std::unique_ptr<RequestData> data) {
- auto wlock = data_.wlock();
- if (wlock->count(val)) {
- LOG_FIRST_N(WARNING, 1)
- << "Called RequestContext::setContextData with data already set";
-
- (*wlock)[val] = nullptr;
- } else {
- (*wlock)[val] = std::move(data);
- }
+ doSetContextData(val, data, false /* strict */);
}
bool RequestContext::setContextDataIfAbsent(
const std::string& val,
std::unique_ptr<RequestData> data) {
- auto ulock = data_.ulock();
- if (ulock->count(val)) {
- return false;
- }
-
- auto wlock = ulock.moveFromUpgradeToWrite();
- (*wlock)[val] = std::move(data);
- return true;
+ return doSetContextData(val, data, true /* strict */);
}
bool RequestContext::hasContextData(const std::string& val) const {
- return data_.rlock()->count(val);
+ return state_.rlock()->requestData_.count(val);
}
RequestData* RequestContext::getContextData(const std::string& val) {
const std::unique_ptr<RequestData> dflt{nullptr};
- return get_ref_default(*data_.rlock(), val, dflt).get();
+ return get_ref_default(state_.rlock()->requestData_, val, dflt).get();
}
const RequestData* RequestContext::getContextData(
const std::string& val) const {
const std::unique_ptr<RequestData> dflt{nullptr};
- return get_ref_default(*data_.rlock(), val, dflt).get();
+ return get_ref_default(state_.rlock()->requestData_, val, dflt).get();
}
void RequestContext::onSet() {
- auto rlock = data_.rlock();
- for (auto const& ent : *rlock) {
- if (auto& data = ent.second) {
- data->onSet();
- }
+ auto rlock = state_.rlock();
+ for (const auto& data : rlock->callbackData_) {
+ data->onSet();
}
}
void RequestContext::onUnset() {
- auto rlock = data_.rlock();
- for (auto const& ent : *rlock) {
- if (auto& data = ent.second) {
- data->onUnset();
- }
+ auto rlock = state_.rlock();
+ for (const auto& data : rlock->callbackData_) {
+ data->onUnset();
}
}
// Delete the RequestData after giving up the wlock just in case one of the
// RequestData destructors will try to grab the lock again.
{
- auto wlock = data_.wlock();
- auto it = wlock->find(val);
- if (it != wlock->end()) {
- requestData = std::move(it->second);
- wlock->erase(it);
+ auto ulock = state_.ulock();
+ auto it = ulock->requestData_.find(val);
+ if (it == ulock->requestData_.end()) {
+ return;
}
+
+ auto wlock = ulock.moveFromUpgradeToWrite();
+ if (it->second && it->second->hasCallback()) {
+ wlock->callbackData_.erase(it->second.get());
+ }
+
+ requestData = std::move(it->second);
+ wlock->requestData_.erase(it);
}
}
return ctx;
}
-RequestContext::Provider& RequestContext::requestContextProvider() {
- class DefaultProvider {
- public:
- constexpr DefaultProvider() = default;
- DefaultProvider(const DefaultProvider&) = delete;
- DefaultProvider& operator=(const DefaultProvider&) = delete;
- DefaultProvider(DefaultProvider&&) = default;
- DefaultProvider& operator=(DefaultProvider&&) = default;
-
- std::shared_ptr<RequestContext>& operator()() {
- return context;
- }
-
- private:
- std::shared_ptr<RequestContext> context;
- };
-
- static SingletonThreadLocal<Provider> providerSingleton(
- []() { return new Provider(DefaultProvider()); });
- return providerSingleton.get();
-}
-
std::shared_ptr<RequestContext>& RequestContext::getStaticContext() {
- auto& provider = requestContextProvider();
- return provider();
+ using SingletonT = SingletonThreadLocal<std::shared_ptr<RequestContext>>;
+ static SingletonT singleton;
+
+ return singleton.get();
}
RequestContext* RequestContext::get() {
}
return context.get();
}
-
-RequestContext::Provider RequestContext::setRequestContextProvider(
- RequestContext::Provider newProvider) {
- if (!newProvider) {
- throw std::runtime_error("RequestContext provider must be non-empty");
- }
-
- auto& provider = requestContextProvider();
- std::swap(provider, newProvider);
- return newProvider;
-}
-}
+} // namespace folly