Progress reporting: Add statistics class for just-mr

2 files changed, 65 insertions, 0 deletions

diff --git a/src/other_tools/just_mr/progress_reporting/TARGETS b/src/other_tools/just_mr/progress_reporting/TARGETS
new file mode 100644
index 00000000..b253d68d
--- /dev/null
+++ b/src/other_tools/just_mr/progress_reporting/TARGETS
@@ -0,0 +1,7 @@
+{ "statistics":
+  { "type": ["@", "rules", "CC", "library"]
+  , "name": ["statistics"]
+  , "hdrs": ["statistics.hpp"]
+  , "stage": ["src", "other_tools", "just_mr", "progress_reporting"]
+  }
+}
diff --git a/src/other_tools/just_mr/progress_reporting/statistics.hpp b/src/other_tools/just_mr/progress_reporting/statistics.hpp
new file mode 100644
index 00000000..efdce7f5
--- /dev/null
+++ b/src/other_tools/just_mr/progress_reporting/statistics.hpp
@@ -0,0 +1,58 @@
+// Copyright 2022 Huawei Cloud Computing Technology Co., Ltd.
+//
+// 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
+//
+//     http://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.
+
+#ifndef INCLUDED_SRC_OTHER_TOOLS_JUST_MR_PROGRESS_REPORTING_STATISTICS_HPP
+#define INCLUDED_SRC_OTHER_TOOLS_JUST_MR_PROGRESS_REPORTING_STATISTICS_HPP
+
+#include <atomic>
+
+class JustMRStatistics {
+  public:
+    [[nodiscard]] static auto Instance() noexcept -> JustMRStatistics& {
+        static JustMRStatistics instance{};
+        return instance;
+    }
+
+    void Reset() noexcept {
+        num_local_paths_ = 0;
+        num_cache_hits_ = 0;
+        num_queued_ = 0;
+        num_executed_ = 0;
+    }
+    void IncrementLocalPathsCounter() noexcept { ++num_local_paths_; }
+    void IncrementCacheHitsCounter() noexcept { ++num_cache_hits_; }
+    void IncrementQueuedCounter() noexcept { ++num_queued_; }
+    void IncrementExecutedCounter() noexcept { ++num_executed_; }
+
+    [[nodiscard]] auto LocalPathsCounter() const noexcept -> int {
+        return num_local_paths_;
+    }
+    [[nodiscard]] auto CacheHitsCounter() const noexcept -> int {
+        return num_cache_hits_;
+    }
+    [[nodiscard]] auto QueuedCounter() const noexcept -> int {
+        return num_queued_;
+    }
+    [[nodiscard]] auto ExecutedCounter() const noexcept -> int {
+        return num_executed_;
+    }
+
+  private:
+    std::atomic<int> num_local_paths_{};  // roots that are actual paths
+    std::atomic<int> num_cache_hits_{};   // no-ops
+    std::atomic<int> num_queued_{};       // actual work queued
+    std::atomic<int> num_executed_{};     // actual work done
+};
+
+#endif  // INCLUDED_SRC_OTHER_TOOLS_JUST_MR_PROGRESS_REPORTING_STATISTICS_HPP