cartographer/cartographer_grpc/framework/execution_context.h

66 lines
2.3 KiB
C++

/*
* Copyright 2017 The Cartographer Authors
*
* 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.
*/
#ifndef CARTOGRAPHER_GRPC_FRAMEWORK_EXECUTION_CONTEXT_H
#define CARTOGRAPHER_GRPC_FRAMEWORK_EXECUTION_CONTEXT_H
#include "cartographer/common/mutex.h"
#include "glog/logging.h"
namespace cartographer_grpc {
namespace framework {
// Implementations of this class allow RPC handlers to share state among one
// another. Using Server::SetExecutionContext(...) a server-wide
// 'ExecutionContext' can be specified. This 'ExecutionContext' can be retrieved
// by all implementations of 'RpcHandler' by calling
// 'RpcHandler::GetContext<MyContext>()'.
class ExecutionContext {
public:
// Automatically locks an ExecutionContext for shared use by RPC handlers.
// This non-movable, non-copyable class is used to broker access from various
// RPC handlers to the shared 'ExecutionContext'.
template <typename ContextType>
class Synchronized {
public:
ContextType* operator->() {
return static_cast<ContextType*>(execution_context_);
}
Synchronized(cartographer::common::Mutex* lock,
ExecutionContext* execution_context)
: locker_(lock), execution_context_(execution_context) {}
Synchronized(const Synchronized&) = delete;
Synchronized(Synchronized&&) = delete;
private:
cartographer::common::MutexLocker locker_;
ExecutionContext* execution_context_;
};
ExecutionContext() = default;
virtual ~ExecutionContext() = default;
ExecutionContext(const ExecutionContext&) = delete;
ExecutionContext& operator=(const ExecutionContext&) = delete;
cartographer::common::Mutex* lock() { return &lock_; }
private:
cartographer::common::Mutex lock_;
};
} // namespace framework
} // namespace cartographer_grpc
#endif // CARTOGRAPHER_GRPC_FRAMEWORK_EXECUTION_CONTEXT_H