/*
- * Copyright 2017 Facebook, Inc.
+ * Copyright 2016-present Facebook, Inc.
*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. The ASF licenses this file
- * to you 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
+ * 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.
+ * 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.
*/
#include <folly/io/async/Request.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) {
- return get_ref_default(*data_.rlock(), val, nullptr).get();
+ const std::unique_ptr<RequestData> dflt{nullptr};
+ return get_ref_default(state_.rlock()->requestData_, val, dflt).get();
}
const RequestData* RequestContext::getContextData(
const std::string& val) const {
- return get_ref_default(*data_.rlock(), val, nullptr).get();
+ const std::unique_ptr<RequestData> dflt{nullptr};
+ 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();
}
}
void RequestContext::clearContextData(const std::string& val) {
- data_.wlock()->erase(val);
+ std::unique_ptr<RequestData> requestData;
+ // Delete the RequestData after giving up the wlock just in case one of the
+ // RequestData destructors will try to grab the lock again.
+ {
+ 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);
+ }
}
std::shared_ptr<RequestContext> RequestContext::setContext(
}
RequestContext* RequestContext::get() {
- auto context = getStaticContext();
+ auto& context = getStaticContext();
if (!context) {
static RequestContext defaultContext;
return std::addressof(defaultContext);
}
return context.get();
}
-}
+} // namespace folly