Turn ActionCacheStatistics into a proto.

This is to avoid having to maintain an almost-equal Java data type once
we start externalizing statistics.

RELNOTES: None.
PiperOrigin-RevId: 167037360

2 files changed, 36 insertions, 0 deletions

diff --git a/src/main/protobuf/BUILD b/src/main/protobuf/BUILD
index 14ce83b71d..afbfc5bf0a 100644
--- a/src/main/protobuf/BUILD
+++ b/src/main/protobuf/BUILD
@@ -6,6 +6,7 @@ load("//third_party/protobuf/3.2.0:protobuf.bzl", "cc_proto_library", "py_proto_
 load("//third_party/grpc:build_defs.bzl", "java_grpc_library")
 
 FILES = [
+    "action_cache",
     "android_deploy_info",
     "apk_manifest",
     "build",
diff --git a/src/main/protobuf/action_cache.proto b/src/main/protobuf/action_cache.proto
new file mode 100644
index 0000000000..429990dda0
--- /dev/null
+++ b/src/main/protobuf/action_cache.proto
@@ -0,0 +1,35 @@
+// Copyright 2017 The Bazel 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.
+
+syntax = "proto3";
+
+package blaze;
+
+option java_package = "com.google.devtools.build.lib.actions.cache";
+option java_outer_classname = "Protos";
+
+// Information about the action cache behavior during a single build.
+message ActionCacheStatistics {
+  // Size of the action cache in bytes.
+  //
+  // This is computed by the code that persists the action cache to disk and
+  // represents the size of the written files, which has no direct relation to
+  // the number of entries in the cache.
+  uint64 size_in_bytes = 1;
+
+  // Time it took to save the action cache to disk.
+  uint64 save_time_in_ms = 2;
+
+  // NEXT TAG: 3
+}