1 files changed, 72 insertions, 0 deletions
diff --git a/src/core/ext/filters/client_channel/lb_policy/xds/xds_client_stats.h b/src/core/ext/filters/client_channel/lb_policy/xds/xds_client_stats.h
new file mode 100644
index 0000000000..fa0b9f4b63
--- /dev/null
+++ b/src/core/ext/filters/client_channel/lb_policy/xds/xds_client_stats.h
@@ -0,0 +1,72 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * 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 GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_XDS_XDS_CLIENT_STATS_H
+#define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_XDS_XDS_CLIENT_STATS_H
+
+#include <grpc/support/port_platform.h>
+
+#include <grpc/support/atm.h>
+
+#include "src/core/lib/gprpp/inlined_vector.h"
+#include "src/core/lib/gprpp/memory.h"
+#include "src/core/lib/gprpp/ref_counted.h"
+
+namespace grpc_core {
+
+class XdsLbClientStats : public RefCounted<XdsLbClientStats> {
+ public:
+  struct DropTokenCount {
+    UniquePtr<char> token;
+    int64_t count;
+
+    DropTokenCount(UniquePtr<char> token, int64_t count)
+        : token(std::move(token)), count(count) {}
+  };
+
+  typedef InlinedVector<DropTokenCount, 10> DroppedCallCounts;
+
+  XdsLbClientStats() {}
+
+  void AddCallStarted();
+  void AddCallFinished(bool finished_with_client_failed_to_send,
+                       bool finished_known_received);
+
+  // This method is not thread-safe; caller must synchronize.
+  void AddCallDroppedLocked(char* token);
+
+  // This method is not thread-safe; caller must synchronize.
+  void GetLocked(int64_t* num_calls_started, int64_t* num_calls_finished,
+                 int64_t* num_calls_finished_with_client_failed_to_send,
+                 int64_t* num_calls_finished_known_received,
+                 UniquePtr<DroppedCallCounts>* drop_token_counts);
+
+ private:
+  // This field must only be accessed via *_locked() methods.
+  UniquePtr<DroppedCallCounts> drop_token_counts_;
+  // These fields may be accessed from multiple threads at a time.
+  gpr_atm num_calls_started_ = 0;
+  gpr_atm num_calls_finished_ = 0;
+  gpr_atm num_calls_finished_with_client_failed_to_send_ = 0;
+  gpr_atm num_calls_finished_known_received_ = 0;
+};
+
+}  // namespace grpc_core
+
+#endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_XDS_XDS_CLIENT_STATS_H \
+        */