Implement Bluetooth Multiplex.

PiperOrigin-RevId: 651921709

internal/platform/blocking_queue_stream.h

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+// Copyright 2024 Google LLC
+//
+// 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.
+
+#ifndef PLATFORM_PUBLIC_BLOCKING_QUEUE_STREAM_H_
+#define PLATFORM_PUBLIC_BLOCKING_QUEUE_STREAM_H_
+
+#include <cstdint>
+
+#include "internal/platform/array_blocking_queue.h"
+#include "internal/platform/byte_array.h"
+#include "internal/platform/exception.h"
+#include "internal/platform/feature_flags.h"
+#include "internal/platform/input_stream.h"
+#include "internal/platform/mutex.h"
+
+namespace nearby {
+class BlockingQueueStream : public InputStream {
+ public:
+  BlockingQueueStream();
+  ~BlockingQueueStream() override = default;
+
+  ExceptionOr<ByteArray> Read(std::int64_t size) override;
+  void Write(const ByteArray& bytes);
+  Exception Close() override;
+  bool IsWriting() const {
+    return is_writing_;
+  }
+
+ private:
+  mutable Mutex mutex_;
+  ArrayBlockingQueue<ByteArray> blocking_queue_{FeatureFlags::GetInstance()
+                 .GetFlags()
+                 .blocking_queue_stream_queue_capacity};
+  ByteArray queue_end_{0};
+  bool is_writing_ = false;
+  bool is_closed_ = false;
+};
+}  // namespace nearby
+
+#endif  // #ifndef PLATFORM_PUBLIC_BLOCKING_QUEUE_STREAM_H_
+