Adds a null implementation for Counter metric for mobile platforms.

- Using counters in mobiles will do nothing now.
Change: 130066962

tensorflow/core/BUILD

@@ -159,6 +159,7 @@ cc_library(
         "lib/monitoring/collected_metrics.h",
         "lib/monitoring/collection_registry.h",
         "lib/monitoring/counter.h",
+        "lib/monitoring/mobile_counter.h",
         "lib/monitoring/metric_def.h",
         "lib/random/distribution_sampler.h",
         "lib/random/philox_random.h",

tensorflow/core/lib/monitoring/counter.h

@@ -13,8 +13,15 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ==============================================================================*/
 
-#ifndef THIRD_PARTY_TENSORFLOW_CORE_LIB_MONITORING_ACCUMULATOR_H_
-#define THIRD_PARTY_TENSORFLOW_CORE_LIB_MONITORING_ACCUMULATOR_H_
+#ifndef THIRD_PARTY_TENSORFLOW_CORE_LIB_MONITORING_COUNTER_H_
+#define THIRD_PARTY_TENSORFLOW_CORE_LIB_MONITORING_COUNTER_H_
+
+// We replace this implementation with a null implementation for mobile
+// platforms.
+#include "tensorflow/core/platform/platform.h"
+#ifdef IS_MOBILE_PLATFORM
+#include "tensorflow/core/lib/monitoring/mobile/counter.h"
+#else
 
 #include <array>
 #include <atomic>
@@ -59,7 +66,7 @@ class CounterCell {
   TF_DISALLOW_COPY_AND_ASSIGN(CounterCell);
 };
 
-// A stateful class for updating a cumulative metric.
+// A stateful class for updating a cumulative integer metric.
 //
 // This class encapsulates a set of values (or a single value for a label-less
 // metric). Each value is identified by a tuple of labels. The class allows the
@@ -159,4 +166,5 @@ CounterCell* Counter<NumLabels>::GetCell(const Labels&... labels)
 }  // namespace monitoring
 }  // namespace tensorflow
 
-#endif  // THIRD_PARTY_TENSORFLOW_CORE_LIB_MONITORING_ACCUMULATOR_H_
+#endif  // IS_MOBILE_PLATFORM
+#endif  // THIRD_PARTY_TENSORFLOW_CORE_LIB_MONITORING_COUNTER_H_

tensorflow/core/lib/monitoring/mobile_counter.h

@@ -0,0 +1,67 @@
+/* Copyright 2016 The TensorFlow Authors. All Rights Reserved.
+
+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.
+==============================================================================*/
+
+// Null implementation of the Counter metric for mobile platforms.
+
+#ifndef THIRD_PARTY_TENSORFLOW_CORE_LIB_MONITORING_MOBILE_COUNTER_H_
+#define THIRD_PARTY_TENSORFLOW_CORE_LIB_MONITORING_MOBILE_COUNTER_H_
+
+#include "tensorflow/core/lib/monitoring/metric_def.h"
+#include "tensorflow/core/platform/macros.h"
+
+namespace tensorflow {
+namespace monitoring {
+
+// CounterCell which has a null implementation.
+class CounterCell {
+ public:
+  CounterCell() {}
+  ~CounterCell() {}
+
+  void IncrementBy(int64 step) {}
+  int64 value() const { return 0; }
+
+ private:
+  TF_DISALLOW_COPY_AND_ASSIGN(CounterCell);
+};
+
+// Counter which has a null implementation.
+template <int NumLabels>
+class Counter {
+ public:
+  ~Counter() {}
+
+  static Counter* New(
+      const MetricDef<MetricKind::kCumulative, int64, NumLabels>& metric_def) {
+    return new Counter<NumLabels>();
+  }
+
+  template <typename... Labels>
+  CounterCell* GetCell(const Labels&... labels) {
+    return &default_counter_cell_;
+  }
+
+ private:
+  Counter() {}
+
+  CounterCell default_counter_cell_;
+
+  TF_DISALLOW_COPY_AND_ASSIGN(Counter);
+};
+
+}  // namespace monitoring
+}  // namespace tensorflow
+
+#endif  // THIRD_PARTY_TENSORFLOW_CORE_LIB_MONITORING_MOBILE_COUNTER_H_