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95 lines
3.6 KiB
C++
95 lines
3.6 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_FASTPAIR_HANDSHAKE_FAST_PAIR_HANDSHAKE_LOOKUP_H_
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#define THIRD_PARTY_NEARBY_FASTPAIR_HANDSHAKE_FAST_PAIR_HANDSHAKE_LOOKUP_H_
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#include <functional>
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#include <memory>
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#include <optional>
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#include "absl/container/flat_hash_map.h"
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#include "absl/functional/any_invocable.h"
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#include "absl/synchronization/mutex.h"
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#include "fastpair/common/fast_pair_device.h"
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#include "fastpair/common/pair_failure.h"
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#include "fastpair/handshake/fast_pair_handshake.h"
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#include "fastpair/internal/mediums/mediums.h"
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namespace nearby {
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namespace fastpair {
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// This Singletonclass creates, deletes and exposes FastPairHandshake instances.
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class FastPairHandshakeLookup {
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public:
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using OnCompleteCallback = absl::AnyInvocable<void(
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FastPairDevice& device, std::optional<PairFailure> failure)>;
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using CreateFunction = absl::AnyInvocable<std::unique_ptr<FastPairHandshake>(
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FastPairDevice& device, Mediums& mediums, OnCompleteCallback callback)>;
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// This is the static method that controls the access to the singleton
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// instance. On the first run, it creates a singleton object and places it
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// into the static field. On subsequent runs, it returns the existing object
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// stored in the static field.
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static FastPairHandshakeLookup* GetInstance();
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static void SetCreateFunctionForTesting(CreateFunction create_function);
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// Singletons should not be cloneable.
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FastPairHandshakeLookup(const FastPairHandshakeLookup&) = delete;
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// Singletons should not be assignable.
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FastPairHandshakeLookup& operator=(const FastPairHandshakeLookup&) = delete;
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// Get an existing instance for |FastPairdevice|.
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FastPairHandshake* Get(FastPairDevice* device);
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// Get an existing instance for |address|.
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FastPairHandshake* Get(absl::string_view address);
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// Erases the FastPairHandshake instance for |FastPairdevice| if it exists.
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bool Erase(FastPairDevice* device);
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// Erases the FastPairHandshake instance for |FastPairdevice| if it exists.
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bool Erase(absl::string_view address);
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// Deletes all existing FastPairHandshake instances.
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void Clear();
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// Creates and returns a new instance for |FastPairdevice| if no instance
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// already exists.
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// Returns the existing instance if there is one.
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FastPairHandshake* Create(FastPairDevice& device, Mediums& mediums,
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OnCompleteCallback on_complete,
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SingleThreadExecutor* executor);
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protected:
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// Constructor/destructor of singleton object should not be public
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// for which the destructor will never be called.
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// and constructor will be invoked once from GetInstance() static method.
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FastPairHandshakeLookup() = default;
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~FastPairHandshakeLookup() = default;
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private:
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static absl::Mutex mutex_;
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static FastPairHandshakeLookup* instance_ ABSL_GUARDED_BY(mutex_);
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absl::flat_hash_map<FastPairDevice*, std::unique_ptr<FastPairHandshake>>
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fast_pair_handshakes_ ABSL_GUARDED_BY(mutex_);
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};
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} // namespace fastpair
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} // namespace nearby
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#endif // THIRD_PARTY_NEARBY_FASTPAIR_HANDSHAKE_FAST_PAIR_HANDSHAKE_LOOKUP_H_
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