intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 20 insertions, 0 deletions

diff --git a/library/cpp/retry/utils.cpp b/library/cpp/retry/utils.cpp
new file mode 100644
index 0000000000..24d943f518
--- /dev/null
+++ b/library/cpp/retry/utils.cpp
@@ -0,0 +1,20 @@
+#include "utils.h"
+
+#include <util/random/random.h>
+
+TDuration NRetryPrivate::AddRandomDelta(TDuration maxDelta) {
+    if (maxDelta == TDuration::Zero()) {
+        return TDuration::Zero();
+    }
+
+    const TDuration delta = TDuration::MicroSeconds(RandomNumber(2 * maxDelta.MicroSeconds()));
+    return delta - maxDelta;
+}
+
+TDuration NRetryPrivate::AddIncrement(ui32 attempt, TDuration increment) {
+    return TDuration::MicroSeconds(attempt * increment.MicroSeconds());
+}
+
+TDuration NRetryPrivate::AddExponentialMultiplier(ui32 attempt, TDuration exponentialMultiplier) {
+    return TDuration::MicroSeconds((1ull << Min(63u, attempt)) * exponentialMultiplier.MicroSeconds());
+}