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/*
* Copyright (C) 2017 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.
*/
#ifndef INCLUDE_PERFETTO_EXT_IPC_ASYNC_RESULT_H_
#define INCLUDE_PERFETTO_EXT_IPC_ASYNC_RESULT_H_
#include <memory>
#include <type_traits>
#include <utility>
#include "perfetto/ext/ipc/basic_types.h"
namespace perfetto {
namespace ipc {
// Wraps the result of an asynchronous invocation. This is the equivalent of a
// std::pair<unique_ptr<T>, bool> with syntactic sugar. It is used as callback
// argument by Deferred<T>. T is a ProtoMessage subclass (i.e. generated .pb.h).
template <typename T>
class AsyncResult {
public:
static AsyncResult Create() {
return AsyncResult(std::unique_ptr<T>(new T()));
}
AsyncResult(std::unique_ptr<T> msg = nullptr,
bool has_more = false,
int fd = -1)
: msg_(std::move(msg)), has_more_(has_more), fd_(fd) {
static_assert(std::is_base_of<ProtoMessage, T>::value, "T->ProtoMessage");
}
AsyncResult(AsyncResult&&) noexcept = default;
AsyncResult& operator=(AsyncResult&&) = default;
bool success() const { return !!msg_; }
explicit operator bool() const { return success(); }
bool has_more() const { return has_more_; }
void set_has_more(bool has_more) { has_more_ = has_more; }
void set_msg(std::unique_ptr<T> msg) { msg_ = std::move(msg); }
T* release_msg() { return msg_.release(); }
T* operator->() { return msg_.get(); }
T& operator*() { return *msg_; }
void set_fd(int fd) { fd_ = fd; }
int fd() const { return fd_; }
private:
std::unique_ptr<T> msg_;
bool has_more_ = false;
// Optional. Only for messages that convey a file descriptor, for sharing
// memory across processes.
int fd_ = -1;
};
} // namespace ipc
} // namespace perfetto
#endif // INCLUDE_PERFETTO_EXT_IPC_ASYNC_RESULT_H_
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