Based on the bazel set up build environment

.clang-format

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+# Use the Google style in this project.
+BasedOnStyle: Google

.gitignore

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+bazel-*

BUILD

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+load("@rules_foreign_cc//tools/build_defs:configure.bzl", "configure_make")
+load(
+    "@com_google_absl//absl:copts/configure_copts.bzl",
+    "GCC_FLAGS",
+    "GCC_TEST_FLAGS",
+    "LLVM_FLAGS",
+    "LLVM_TEST_FLAGS",
+    "MSVC_FLAGS",
+    "MSVC_TEST_FLAGS",
+)
+
+WERROR = ["-Werror=return-type", "-Werror=switch"]
+
+DEFAULT_COPTS = select({
+    "//opencensus:llvm_compiler": LLVM_FLAGS + WERROR,
+    "//opencensus:windows": MSVC_FLAGS,
+    "//conditions:default": GCC_FLAGS + WERROR,
+})
+
+TEST_COPTS = DEFAULT_COPTS + select({
+    "//opencensus:llvm_compiler": LLVM_TEST_FLAGS + WERROR,
+    "//opencensus:windows": MSVC_TEST_FLAGS,
+    "//conditions:default": GCC_TEST_FLAGS + WERROR,
+})
+
+configure_make(
+    name = "libevent",
+    visibility = ["//visibility:public"],
+    configure_options = [
+        "--enable-shared=no",
+        "--disable-libevent-regress",
+        "--disable-openssl",
+    ],
+    lib_source = "@com_github_libevent//:all",
+    out_lib_dir = "lib",
+)

README.md

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+<img src="https://user-images.githubusercontent.com/9434884/43697219-3cb4ef3a-9975-11e8-9a9c-73f4f537442d.png" alt="Sentinel Logo" width="50%">
+
+# Sentinel: Sentinel of Your Application
+
+## Build
+
+1. Install the latest version of [Bazel](https://bazel.build/versions/master/docs/install.html) in your environment.
+2. Build the examples to see how it works.
+```
+bazel build -c opt //examples/...
+```
+

WORKSPACE

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+# Copyright 2019 Alibaba Inc.  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.
+
+workspace(name = "com_alibaba_sentinel")
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+# Rule repository
+http_archive(
+   name = "rules_foreign_cc",
+   strip_prefix = "rules_foreign_cc-master",
+   url = "https://github.com/bazelbuild/rules_foreign_cc/archive/master.zip",
+)
+
+load("@rules_foreign_cc//:workspace_definitions.bzl", "rules_foreign_cc_dependencies")
+
+rules_foreign_cc_dependencies()
+
+# abseil-cpp
+http_archive(
+  name = "com_google_absl",
+  urls = ["https://github.com/abseil/abseil-cpp/archive/7c7754fb3ed9ffb57d35fe8658f3ba4d73a31e72.zip"],  # 2019-03-14
+  strip_prefix = "abseil-cpp-7c7754fb3ed9ffb57d35fe8658f3ba4d73a31e72",
+  sha256 = "71d00d15fe6370220b6685552fb66e5814f4dd2e130f3836fc084c894943753f",
+)
+
+# Google Test
+http_archive(
+  name = "com_google_googletest",
+  urls = ["https://github.com/google/googletest/archive/8b6d3f9c4a774bef3081195d422993323b6bb2e0.zip"],  # 2019-03-05
+  strip_prefix = "googletest-8b6d3f9c4a774bef3081195d422993323b6bb2e0",
+  sha256 = "d21ba93d7f193a9a0ab80b96e8890d520b25704a6fac976fe9da81fffb3392e3",
+)
+
+# Google Benchmark
+http_archive(
+  name = "com_google_benchmark",
+  urls = ["https://github.com/google/benchmark/archive/505be96ab23056580a3a2315abba048f4428b04e.tar.gz"],
+  strip_prefix = "benchmark-505be96ab23056580a3a2315abba048f4428b04e",
+  sha256 = "0de43b6eaddd356f1d6cd164f73f37faf2f6c96fd684e1f7ea543ce49c1d144e",
+)
+
+load("//bazel:third_party_repositories.bzl", "include_third_party_repositories")
+include_third_party_repositories()

bazel/fmtlib.BUILD

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+licenses(["notice"])  # Apache 2
+
+cc_library(
+    name = "fmtlib",
+    srcs = glob([
+        "fmt/*.cc",
+    ]),
+    hdrs = glob([
+        "include/fmt/*.h",
+    ]),
+    defines = ["FMT_HEADER_ONLY"],
+    includes = ["include"],
+    visibility = ["//visibility:public"],
+)
+

bazel/spdlog.BUILD

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+licenses(["notice"])  # Apache 2
+
+cc_library(
+    name = "spdlog",
+    hdrs = glob([
+        "include/**/*.cc",
+        "include/**/*.h",
+    ]),
+    defines = ["SPDLOG_FMT_EXTERNAL"],
+    includes = ["include"],
+    visibility = ["//visibility:public"],
+    deps = ["@com_github_fmtlib_fmt//:fmtlib"],
+)
+

bazel/third_party_repositories.bzl

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+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+all_content = """filegroup(name = "all", srcs = glob(["**"]), visibility = ["//visibility:public"])"""
+
+def include_third_party_repositories():
+    http_archive(
+        name = "com_github_libevent",
+        build_file_content = all_content,
+        strip_prefix = "libevent-2.1.8-stable",
+        urls = ["https://github.com/libevent/libevent/releases/download/release-2.1.8-stable/libevent-2.1.8-stable.tar.gz"],
+    )
+
+    http_archive(
+        name = "com_github_fmtlib_fmt",
+        sha256 = "4c0741e10183f75d7d6f730b8708a99b329b2f942dad5a9da3385ab92bb4a15c",
+        strip_prefix = "fmt-5.3.0",
+        urls = ["https://github.com/fmtlib/fmt/releases/download/5.3.0/fmt-5.3.0.zip"],
+        build_file = "//bazel:fmtlib.BUILD",
+    )
+
+    http_archive(
+        name = "com_github_gabime_spdlog",
+        build_file = "//bazel:spdlog.BUILD",
+        sha256 = "160845266e94db1d4922ef755637f6901266731c4cb3b30b45bf41efa0e6ab70",
+        strip_prefix = "spdlog-1.3.1",
+        urls = ["https://github.com/gabime/spdlog/archive/v1.3.1.tar.gz"],
+    )

examples/abseil/BUILD

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+cc_binary(
+    name = "asbeil_string",
+    srcs = ["abseil_string.cc"],
+    deps = [
+        "@com_google_absl//absl/strings",
+    ],
+)

examples/abseil/abseil_string.cc

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+#include <iostream>
+#include <string>
+
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+
+std::string Greet(absl::string_view person) {
+  return absl::StrCat("Hello ", person);
+}
+
+int main(int argc, char* argv[]) {
+  std::cout << Greet(argc < 2 ? "world" : argv[1]) << std::endl;
+}

examples/benchmark/BUILD

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+cc_binary(
+    name = "benchmark_test",
+    srcs = ["benchamrk_test.cc"],
+    deps = [
+        "@com_google_benchmark//:benchmark",
+    ],
+)

examples/benchmark/benchamrk_test.cc

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+#include <benchmark/benchmark.h>
+
+static void BM_StringCreation(benchmark::State& state) {
+  for (auto _ : state) std::string empty_string;
+}
+// Register the function as a benchmark
+BENCHMARK(BM_StringCreation);
+
+// Define another benchmark
+static void BM_StringCopy(benchmark::State& state) {
+  std::string x = "hello";
+  for (auto _ : state) std::string copy(x);
+}
+
+BENCHMARK(BM_StringCopy);
+BENCHMARK_MAIN();

examples/fmt/BUILD

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+cc_binary(
+    name = "fmt_test",
+    srcs = ["fmt_test.cc"],
+    deps = [
+        "@com_github_fmtlib_fmt//:fmtlib",
+    ],
+)

examples/fmt/fmt_test.cc

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+#include <iostream>
+#include <string>
+
+#include "fmt/format.h"
+
+int main() {
+  std::string s = fmt::format("I'd rather be {1} than {0}.", "right", "happy");
+  std::cout << s << std::endl;
+  return 0;
+}

examples/gtest/BUILD

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+cc_test(
+    name = "hello_test",
+    srcs = ["hello_test.cc"],
+    deps = [
+        "@com_google_googletest//:gtest_main",
+    ],
+)

examples/gtest/hello_test.cc

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+#include <string>
+
+#include "gtest/gtest.h"
+
+TEST(HelloTest, Basic) { EXPECT_EQ("Hello tester", "Hello tester"); }

examples/libevent/BUILD

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+cc_binary(
+    name = "libevent_echosrv1",
+    srcs = ["libevent_echosrv1.c"],
+    deps = [
+        "//:libevent",
+    ],
+)