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57 lines
2.1 KiB
C++
57 lines
2.1 KiB
C++
// Copyright 2023 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef THIRD_PARTY_NEARBY_INTERNAL_WEAVE_PACKETIZER_H_
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#define THIRD_PARTY_NEARBY_INTERNAL_WEAVE_PACKETIZER_H_
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#include <string>
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#include "absl/status/statusor.h"
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#include "internal/platform/byte_array.h"
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#include "internal/platform/mutex.h"
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#include "internal/weave/packet.h"
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namespace nearby {
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namespace weave {
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// Joins Weave packets to create messages.
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class Packetizer {
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public:
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// Adds a Packet to an ongoing message, returning absl::OkStatus() on success.
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//
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// Returns absl::InvalidArgumentError if the packet being added is
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// not marked as the first packet (if no prior packets have been joined) or if
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// the packet being joined is marked as the first packet, but there is already
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// a message being reconstructed.
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absl::Status AddPacket(Packet packet) ABSL_LOCKS_EXCLUDED(mutex_);
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// Should be called after each call to AddPacket() to get the message if
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// available. This function will return absl::UnavailableError should the
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// message not be available at the time of calling. This will clear the
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// packetizer buffer on a successful call.
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absl::StatusOr<ByteArray> TakeMessage() ABSL_LOCKS_EXCLUDED(mutex_);
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// Resets the packetizer, clearing any pending messages.
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void Reset() ABSL_LOCKS_EXCLUDED(mutex_);
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private:
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Mutex mutex_;
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std::string pending_payloads_ ABSL_GUARDED_BY(mutex_);
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bool is_message_complete_ ABSL_GUARDED_BY(mutex_) = false;
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};
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} // namespace weave
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} // namespace nearby
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#endif // THIRD_PARTY_NEARBY_INTERNAL_WEAVE_PACKETIZER_H_
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