| // Copyright 2021 The Pigweed 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 |
| // |
| // https://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. |
| #pragma once |
| |
| #include "pw_assert/assert.h" |
| #include "pw_containers/intrusive_list.h" |
| #include "pw_result/result.h" |
| #include "pw_transfer/handler.h" |
| |
| namespace pw::transfer::internal { |
| |
| // Information about a single transfer. |
| class Context { |
| public: |
| enum Type { kRead, kWrite }; |
| |
| constexpr Context() |
| : type_(kRead), |
| handler_(nullptr), |
| offset_(0), |
| pending_bytes_(0), |
| max_chunk_size_bytes_(std::numeric_limits<uint32_t>::max()) {} |
| |
| Context(const Context&) = delete; |
| Context(Context&&) = delete; |
| Context& operator=(const Context&) = delete; |
| Context& operator=(Context&&) = delete; |
| |
| Status Start(Type type, Handler& handler); |
| void Finish(Status status); |
| |
| constexpr bool active() const { return handler_ != nullptr; } |
| |
| constexpr uint32_t transfer_id() const { return handler().id(); } |
| |
| stream::Reader& reader() const { |
| PW_DASSERT(type_ == kRead); |
| return handler().reader(); |
| } |
| |
| stream::Writer& writer() const { |
| PW_DASSERT(type_ == kWrite); |
| return handler().writer(); |
| } |
| |
| constexpr uint32_t offset() const { return offset_; } |
| constexpr void set_offset(size_t offset) { offset_ = offset; } |
| |
| constexpr uint32_t pending_bytes() const { return pending_bytes_; } |
| constexpr void set_pending_bytes(size_t pending_bytes) { |
| pending_bytes_ = pending_bytes; |
| } |
| |
| constexpr uint32_t max_chunk_size_bytes() const { |
| return max_chunk_size_bytes_; |
| } |
| constexpr void set_max_chunk_size_bytes(size_t max_chunk_size_bytes) { |
| max_chunk_size_bytes_ = max_chunk_size_bytes; |
| } |
| |
| private: |
| constexpr Handler& handler() { |
| PW_DASSERT(active()); |
| return *handler_; |
| } |
| |
| constexpr const Handler& handler() const { |
| PW_DASSERT(active()); |
| return *handler_; |
| } |
| |
| Type type_; |
| Handler* handler_; |
| size_t offset_; |
| size_t pending_bytes_; |
| size_t max_chunk_size_bytes_; |
| }; |
| |
| class ContextPool { |
| public: |
| constexpr ContextPool(Context::Type type, |
| IntrusiveList<internal::Handler>& handlers) |
| : type_(type), handlers_(handlers) {} |
| |
| Result<Context*> GetOrStartTransfer(uint32_t id); |
| |
| private: |
| // TODO(frolv): Initially, only one transfer at a time is supported. Once that |
| // is updated, this should be made configurable. |
| static constexpr int kMaxConcurrentTransfers = 1; |
| |
| Context::Type type_; |
| std::array<Context, kMaxConcurrentTransfers> transfers_; |
| IntrusiveList<internal::Handler>& handlers_; |
| }; |
| |
| } // namespace pw::transfer::internal |