1 files changed, 54 insertions, 0 deletions
diff --git a/toolkit/components/telemetry/geckoview/streaming/GeckoViewStreamingTelemetry.h b/toolkit/components/telemetry/geckoview/streaming/GeckoViewStreamingTelemetry.h
new file mode 100644
index 0000000000..720a6ff042
--- /dev/null
+++ b/toolkit/components/telemetry/geckoview/streaming/GeckoViewStreamingTelemetry.h
@@ -0,0 +1,54 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GeckoViewStreamingTelemetry_h__
+#define GeckoViewStreamingTelemetry_h__
+
+#include "mozilla/RefCounted.h"
+#include "mozilla/RefPtr.h"
+#include "nsISupportsImpl.h"
+#include "nsString.h"
+
+#include <cstdint>
+
+namespace GeckoViewStreamingTelemetry {
+
+void HistogramAccumulate(const nsCString& aName, bool aIsCategorical,
+                         uint32_t aValue);
+
+void BoolScalarSet(const nsCString& aName, bool aValue);
+void StringScalarSet(const nsCString& aName, const nsCString& aValue);
+void UintScalarSet(const nsCString& aName, uint32_t aValue);
+
+// Classes wishing to receive Streaming Telemetry must implement this interface
+// and register themselves via RegisterDelegate.
+class StreamingTelemetryDelegate {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(StreamingTelemetryDelegate)
+
+  // Receive* methods will be called from time to time on the main thread.
+  virtual void ReceiveHistogramSamples(const nsCString& aName,
+                                       const nsTArray<uint32_t>& aSamples) = 0;
+  virtual void ReceiveCategoricalHistogramSamples(
+      const nsCString& aName, const nsTArray<uint32_t>& aSamples) = 0;
+  virtual void ReceiveBoolScalarValue(const nsCString& aName, bool aValue) = 0;
+  virtual void ReceiveStringScalarValue(const nsCString& aName,
+                                        const nsCString& aValue) = 0;
+  virtual void ReceiveUintScalarValue(const nsCString& aName,
+                                      uint32_t aValue) = 0;
+
+ protected:
+  virtual ~StreamingTelemetryDelegate() = default;
+};
+
+// Registers the provided StreamingTelemetryDelegate to receive Streaming
+// Telemetry, overwriting any previous delegate registration.
+// Call on any thread.
+void RegisterDelegate(const RefPtr<StreamingTelemetryDelegate>& aDelegate);
+
+}  // namespace GeckoViewStreamingTelemetry
+
+#endif  // GeckoViewStreamingTelemetry_h__