Implement Bluetooth Multiplex.

PiperOrigin-RevId: 651921709

internal/platform/blocking_queue_stream.cc

@@ -0,0 +1,72 @@
+// 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.
+
+#include "internal/platform/blocking_queue_stream.h"
+
+#include <cstdint>
+
+#include "internal/platform/byte_array.h"
+#include "internal/platform/exception.h"
+#include "internal/platform/feature_flags.h"
+#include "internal/platform/logging.h"
+
+namespace nearby {
+
+BlockingQueueStream::BlockingQueueStream() {
+  NEARBY_LOGS(INFO) << "Create a BlockingQueueStream with size "
+                    << FeatureFlags::GetInstance()
+                           .GetFlags()
+                           .blocking_queue_stream_queue_capacity;
+}
+
+ExceptionOr<ByteArray> BlockingQueueStream::Read(std::int64_t size) {
+  if (is_closed_) {
+    NEARBY_LOGS(INFO)
+        << "Failed to read BlockingQueueStream because it was closed.";
+    return ExceptionOr<ByteArray>(Exception::kInterrupted);
+  }
+  NEARBY_LOGS(INFO) << "BlockingQueueStream read " << size << " bytes";
+  return ExceptionOr<ByteArray>(blocking_queue_.Take());
+}
+
+void BlockingQueueStream::Write(const ByteArray& bytes) {
+  if (is_closed_) {
+    NEARBY_LOGS(INFO)
+        << "Failed to write BlockingQueueStream because it was closed.";
+    return;
+  }
+  is_writing_ = true;
+  blocking_queue_.Put(bytes);
+  is_writing_ = false;
+  NEARBY_LOGS(VERBOSE) << "BlockingQueueStream wrote " << bytes.size()
+                       << " bytes";
+}
+
+Exception BlockingQueueStream::Close() {
+  if (is_closed_) {
+    NEARBY_LOGS(INFO) << "InputBlockingQueueStream has already been closed.";
+    return {Exception::kSuccess};
+  }
+  if (is_writing_) {
+    NEARBY_LOGS(INFO)
+        << "BlockingQueueStream is waiting for writing, read first to unblock";
+    blocking_queue_.TryTake();
+  }
+  blocking_queue_.TryPut(queue_end_);
+  is_closed_ = true;
+  NEARBY_LOGS(INFO) << "InputBlockingQueueStream is closed.";
+  return {Exception::kSuccess};
+}
+
+}  // namespace nearby