Source release 14.0.0

metrics/include/attribute_handler.h

@@ -0,0 +1,53 @@
+// Copyright 2018 Google Inc. All Rights Reserved.
+//
+// This file contains the declarations for the EventMetric class and related
+// types.
+#ifndef WVCDM_METRICS_ATTRIBUTE_HANDLER_H_
+#define WVCDM_METRICS_ATTRIBUTE_HANDLER_H_
+
+#include "OEMCryptoCENC.h"
+#include "field_tuples.h"
+#include "log.h"
+#include "metrics.pb.h"
+#include "pow2bucket.h"
+#include "value_metric.h"
+#include "wv_cdm_types.h"
+
+namespace wvcdm {
+namespace metrics {
+
+// This method is used to set the value of a single proto field.
+// Specializations handle setting each value.
+template <int I, typename F>
+void SetAttributeField(const F& value, drm_metrics::Attributes* attributes);
+
+// This class handles serializing the attributes for metric types that breakdown
+// into multiple buckets.  The template parameters should be specified in pairs.
+// E.g. I1 and F1 should match.  I1 should specify the field number in the proto
+// and F1 should specify the type of the field to be set.
+template <int I1, typename F1, int I2, typename F2, int I3, typename F3, int I4,
+          typename F4>
+class AttributeHandler {
+ public:
+  // This method returns the serialized attribute proto for the given field
+  // values. The order of the field values must match the order in the
+  // template.
+  std::string GetSerializedAttributes(F1 field1, F2 field2, F3 field3,
+                                      F4 field4) const {
+    drm_metrics::Attributes attributes;
+    SetAttributeField<I1, F1>(field1, &attributes);
+    SetAttributeField<I2, F2>(field2, &attributes);
+    SetAttributeField<I3, F3>(field3, &attributes);
+    SetAttributeField<I4, F4>(field4, &attributes);
+    std::string serialized_attributes;
+    if (!attributes.SerializeToString(&serialized_attributes)) {
+      LOGE("Failed to serialize attribute proto.");
+      return "";
+    }
+    return serialized_attributes;
+  }
+};
+
+}  // namespace metrics
+}  // namespace wvcdm
+#endif  // WVCDM_METRICS_ATTRIBUTE_HANDLER_H_