Primiano Tucci | 4f9b6d7 | 2017-12-05 20:59:16 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "perfetto/ipc/deferred.h" |
| 18 | |
| 19 | #include "google/protobuf/message_lite.h" |
| 20 | #include "perfetto/base/logging.h" |
| 21 | |
| 22 | namespace perfetto { |
| 23 | namespace ipc { |
| 24 | |
| 25 | DeferredBase::DeferredBase( |
| 26 | std::function<void(AsyncResult<ProtoMessage>)> callback) |
| 27 | : callback_(std::move(callback)) {} |
| 28 | |
| 29 | DeferredBase::~DeferredBase() { |
| 30 | if (callback_) |
| 31 | Reject(); |
| 32 | } |
| 33 | |
| 34 | // Can't just use "= default" here because the default move operator for |
| 35 | // std::function doesn't necessarily swap and hence can leave a copy of the |
| 36 | // bind state around, which is undesirable. |
| 37 | DeferredBase::DeferredBase(DeferredBase&& other) noexcept { |
| 38 | Move(other); |
| 39 | } |
| 40 | |
| 41 | DeferredBase& DeferredBase::operator=(DeferredBase&& other) { |
| 42 | if (callback_) |
| 43 | Reject(); |
| 44 | Move(other); |
| 45 | return *this; |
| 46 | } |
| 47 | |
| 48 | void DeferredBase::Move(DeferredBase& other) { |
| 49 | callback_ = std::move(other.callback_); |
| 50 | other.callback_ = nullptr; |
| 51 | } |
| 52 | |
| 53 | void DeferredBase::Bind( |
| 54 | std::function<void(AsyncResult<ProtoMessage>)> callback) { |
| 55 | callback_ = std::move(callback); |
| 56 | } |
| 57 | |
| 58 | bool DeferredBase::IsBound() const { |
| 59 | return !!callback_; |
| 60 | } |
| 61 | |
| 62 | void DeferredBase::Resolve(AsyncResult<ProtoMessage> async_result) { |
| 63 | if (!callback_) { |
Florian Mayer | 6db99a9 | 2018-10-18 11:34:55 +0100 | [diff] [blame^] | 64 | PERFETTO_DFATAL("No callback set."); |
Primiano Tucci | 4f9b6d7 | 2017-12-05 20:59:16 +0000 | [diff] [blame] | 65 | return; |
| 66 | } |
| 67 | bool has_more = async_result.has_more(); |
| 68 | callback_(std::move(async_result)); |
| 69 | if (!has_more) |
| 70 | callback_ = nullptr; |
| 71 | } |
| 72 | |
| 73 | // Resolves with a nullptr |msg_|, signalling failure to |callback_|. |
| 74 | void DeferredBase::Reject() { |
| 75 | Resolve(AsyncResult<ProtoMessage>()); |
| 76 | } |
| 77 | |
| 78 | } // namespace ipc |
| 79 | } // namespace perfetto |