Initial checkin of gRPC to third_party/

third_party/grpc/test/cpp/qps/histogram.h

Index: third_party/grpc/test/cpp/qps/histogram.h
diff --git a/third_party/grpc/test/cpp/qps/histogram.h b/third_party/grpc/test/cpp/qps/histogram.h
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+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef TEST_QPS_HISTOGRAM_H
+#define TEST_QPS_HISTOGRAM_H
+
+#include <grpc/support/histogram.h>
+#include "src/proto/grpc/testing/stats.grpc.pb.h"
+
+namespace grpc {
+namespace testing {
+
+class Histogram {
+ public:
+  // TODO: look into making histogram params not hardcoded for C++
+  Histogram()
+      : impl_(gpr_histogram_create(default_resolution(),
+                                   default_max_possible())) {}
+  ~Histogram() {
+    if (impl_) gpr_histogram_destroy(impl_);
+  }
+  Histogram(Histogram&& other) : impl_(other.impl_) { other.impl_ = nullptr; }
+
+  void Merge(const Histogram& h) { gpr_histogram_merge(impl_, h.impl_); }
+  void Add(double value) { gpr_histogram_add(impl_, value); }
+  double Percentile(double pctile) const {
+    return gpr_histogram_percentile(impl_, pctile);
+  }
+  double Count() const { return gpr_histogram_count(impl_); }
+  void Swap(Histogram* other) { std::swap(impl_, other->impl_); }
+  void FillProto(HistogramData* p) {
+    size_t n;
+    const auto* data = gpr_histogram_get_contents(impl_, &n);
+    for (size_t i = 0; i < n; i++) {
+      p->add_bucket(data[i]);
+    }
+    p->set_min_seen(gpr_histogram_minimum(impl_));
+    p->set_max_seen(gpr_histogram_maximum(impl_));
+    p->set_sum(gpr_histogram_sum(impl_));
+    p->set_sum_of_squares(gpr_histogram_sum_of_squares(impl_));
+    p->set_count(gpr_histogram_count(impl_));
+  }
+  void MergeProto(const HistogramData& p) {
+    gpr_histogram_merge_contents(impl_, &*p.bucket().begin(), p.bucket_size(),
+                                 p.min_seen(), p.max_seen(), p.sum(),
+                                 p.sum_of_squares(), p.count());
+  }
+
+  static double default_resolution() { return 0.01; }
+  static double default_max_possible() { return 60e9; }
+
+ private:
+  Histogram(const Histogram&);
+  Histogram& operator=(const Histogram&);
+
+  gpr_histogram* impl_;
+};
+}
+}
+
+#endif /* TEST_QPS_HISTOGRAM_H */