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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.
*/
#include "perfetto/ext/ipc/deferred.h"
#include "perfetto/base/logging.h"
#include "perfetto/ext/base/utils.h"
namespace perfetto {
namespace ipc {
DeferredBase::DeferredBase(
std::function<void(AsyncResult<ProtoMessage>)> callback)
: callback_(std::move(callback)) {}
DeferredBase::~DeferredBase() {
if (callback_)
Reject();
}
// Can't just use "= default" here because the default move operator for
// std::function doesn't necessarily swap and hence can leave a copy of the
// bind state around, which is undesirable.
DeferredBase::DeferredBase(DeferredBase&& other) noexcept {
Move(other);
}
DeferredBase& DeferredBase::operator=(DeferredBase&& other) {
if (callback_)
Reject();
Move(other);
return *this;
}
void DeferredBase::Move(DeferredBase& other) {
callback_ = std::move(other.callback_);
other.callback_ = nullptr;
}
void DeferredBase::Bind(
std::function<void(AsyncResult<ProtoMessage>)> callback) {
callback_ = std::move(callback);
}
bool DeferredBase::IsBound() const {
return !!callback_;
}
void DeferredBase::Resolve(AsyncResult<ProtoMessage> async_result) {
if (!callback_) {
PERFETTO_DFATAL("No callback set.");
return;
}
bool has_more = async_result.has_more();
callback_(std::move(async_result));
if (!has_more)
callback_ = nullptr;
}
// Resolves with a nullptr |msg_|, signalling failure to |callback_|.
void DeferredBase::Reject() {
Resolve(AsyncResult<ProtoMessage>());
}
} // namespace ipc
} // namespace perfetto
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