Add bazel build support for `examples`. (#893)

* Add bazel build support for `examples`.

* Generate workspace depedencies by [migration-tooling](https://github.com/bazelbuild/migration-tooling).

* Change README and add travis job to check bazel build.

* Move sudo command to .travis.yml

* Change library name to opencensus_examples.

4 files changed, 287 insertions, 0 deletions

diff --git a/examples/BUILD.bazel b/examples/BUILD.bazel
new file mode 100644
index 00000000..6c8cf660
--- /dev/null
+++ b/examples/BUILD.bazel
@@ -0,0 +1,61 @@
+load("//:opencensus_workspace.bzl", "opencensus_java_libraries")
+opencensus_java_libraries()
+
+java_library(
+    name = "opencensus_examples",
+    srcs = glob(
+        ["src/main/java/**/*.java"]
+    ),
+    deps = [
+        "@io_opencensus_opencensus_api//jar",
+        "@io_opencensus_opencensus_contrib_zpages//jar",
+        "@io_opencensus_opencensus_exporter_trace_logging//jar",
+    ],
+    runtime_deps = [
+        "@com_google_guava_guava//jar",
+        "@com_lmax_disruptor//jar",
+        "@io_grpc_grpc_context//jar",
+        "@io_opencensus_opencensus_impl//jar",
+        "@io_opencensus_opencensus_impl_core//jar",
+    ],
+)
+
+java_binary(
+    name = "StatsRunner",
+    main_class = "io.opencensus.examples.stats.StatsRunner",
+    runtime_deps = [
+        ":opencensus_examples",
+    ],
+)
+
+java_binary(
+    name = "MultiSpansTracing",
+    main_class = "io.opencensus.examples.trace.MultiSpansTracing",
+    runtime_deps = [
+        ":opencensus_examples",
+    ],
+)
+
+java_binary(
+    name = "MultiSpansScopedTracing",
+    main_class = "io.opencensus.examples.trace.MultiSpansScopedTracing",
+    runtime_deps = [
+        ":opencensus_examples",
+    ],
+)
+
+java_binary(
+    name = "MultiSpansContextTracing",
+    main_class = "io.opencensus.examples.trace.MultiSpansContextTracing",
+    runtime_deps = [
+        ":opencensus_examples",
+    ],
+)
+
+java_binary(
+    name = "ZPagesTester",
+    main_class = "io.opencensus.examples.zpages.ZPagesTester",
+    runtime_deps = [
+        ":opencensus_examples",
+    ],
+)
diff --git a/examples/README.md b/examples/README.md
index cbdce244..55307cef 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -12,6 +12,11 @@ $ ./gradlew installDist
 $ mvn package appassembler:assemble
 ```
 
+### Bazel
+```
+$ bazel build :all
+```
+
 ## To run "StatsRunner" example use
 
 ### Gradle
@@ -24,6 +29,11 @@ $ ./build/install/examples/bin/StatsRunner
 $ ./target/appassembler/bin/StatsRunner
 ```
 
+### Bazel
+```
+$ ./bazel-bin/StatsRunner
+```
+
 ## To run "ZPagesTester"
 
 ### Gradle
@@ -36,6 +46,11 @@ $ ./build/install/examples/bin/ZPagesTester
 $ ./target/appassembler/bin/ZPagesTester
 ```
 
+### Bazel
+```
+$ ./bazel-bin/ZPagesTester
+```
+
 Available pages:
 * For tracing page go to [localhost:8080/tracez][ZPagesTraceZLink]. 
 * For tracing config page go to [localhost:8080/traceconfigz][ZPagesTraceConfigZLink].
diff --git a/examples/WORKSPACE b/examples/WORKSPACE
new file mode 100644
index 00000000..fba9c9c5
--- /dev/null
+++ b/examples/WORKSPACE
@@ -0,0 +1,5 @@
+workspace(name = "opencensus_examples")
+
+load("//:opencensus_workspace.bzl", "opencensus_maven_jars")
+
+opencensus_maven_jars()
diff --git a/examples/opencensus_workspace.bzl b/examples/opencensus_workspace.bzl
new file mode 100644
index 00000000..b2b9251a
--- /dev/null
+++ b/examples/opencensus_workspace.bzl
@@ -0,0 +1,206 @@
+# The following dependencies were calculated from:
+#
+# generate_workspace --artifact=io.opencensus:opencensus-api:0.10.1 --artifact=io.opencensus:opencensus-contrib-zpages:0.10.1 --artifact=io.opencensus:opencensus-exporter-trace-logging:0.10.1 --artifact=io.opencensus:opencensus-impl:0.10.1 --repositories=http://repo.maven.apache.org/maven2
+
+def opencensus_maven_jars():
+  # io.opencensus:opencensus-contrib-zpages:jar:0.10.1 got requested version
+  # io.opencensus:opencensus-impl-core:jar:0.10.1 got requested version
+  # io.opencensus:opencensus-exporter-trace-logging:jar:0.10.1 got requested version
+  # io.opencensus:opencensus-impl:jar:0.10.1 got requested version
+  # io.opencensus:opencensus-api:jar:0.10.1
+  native.maven_jar(
+      name = "com_google_code_findbugs_jsr305",
+      artifact = "com.google.code.findbugs:jsr305:3.0.1",
+      repository = "http://repo.maven.apache.org/maven2/",
+      sha1 = "f7be08ec23c21485b9b5a1cf1654c2ec8c58168d",
+  )
+
+
+  # io.opencensus:opencensus-api:jar:0.10.1
+  native.maven_jar(
+      name = "io_grpc_grpc_context",
+      artifact = "io.grpc:grpc-context:1.8.0",
+      repository = "http://repo.maven.apache.org/maven2/",
+      sha1 = "7fe8214b8d1141afadbe0bcad751df2b8fe2e078",
+  )
+
+
+  native.maven_jar(
+      name = "io_opencensus_opencensus_exporter_trace_logging",
+      artifact = "io.opencensus:opencensus-exporter-trace-logging:0.10.1",
+      repository = "http://repo.maven.apache.org/maven2/",
+      sha1 = "c9d934614bb0237a39eda79d52d245626ef32d71",
+  )
+
+
+  # io.opencensus:opencensus-contrib-zpages:jar:0.10.1 got requested version
+  # io.opencensus:opencensus-impl-core:jar:0.10.1 got requested version
+  # io.opencensus:opencensus-exporter-trace-logging:jar:0.10.1 got requested version
+  # io.opencensus:opencensus-impl:jar:0.10.1 got requested version
+  # io.opencensus:opencensus-api:jar:0.10.1
+  native.maven_jar(
+      name = "com_google_errorprone_error_prone_annotations",
+      artifact = "com.google.errorprone:error_prone_annotations:2.1.2",
+      repository = "http://repo.maven.apache.org/maven2/",
+      sha1 = "6dcc08f90f678ac33e5ef78c3c752b6f59e63e0c",
+  )
+
+
+  native.maven_jar(
+      name = "io_opencensus_opencensus_contrib_zpages",
+      artifact = "io.opencensus:opencensus-contrib-zpages:0.10.1",
+      repository = "http://repo.maven.apache.org/maven2/",
+      sha1 = "4e2cf2a5f05bffb8dedbc8f183f127cd46cd4a3f",
+  )
+
+
+  # io.opencensus:opencensus-impl:jar:0.10.1
+  native.maven_jar(
+      name = "com_lmax_disruptor",
+      artifact = "com.lmax:disruptor:3.3.6",
+      repository = "http://repo.maven.apache.org/maven2/",
+      sha1 = "09bfca4ee4f691f3737b3f4f006d0c4770f178eb",
+  )
+
+
+  # io.opencensus:opencensus-contrib-zpages:jar:0.10.1 got requested version
+  # io.opencensus:opencensus-impl-core:jar:0.10.1 got requested version
+  # io.opencensus:opencensus-exporter-trace-logging:jar:0.10.1 got requested version
+  # io.opencensus:opencensus-api:jar:0.10.1
+  native.maven_jar(
+      name = "com_google_guava_guava",
+      artifact = "com.google.guava:guava:19.0",
+      repository = "http://repo.maven.apache.org/maven2/",
+      sha1 = "6ce200f6b23222af3d8abb6b6459e6c44f4bb0e9",
+  )
+
+
+  # io.opencensus:opencensus-contrib-zpages:jar:0.10.1 got requested version
+  # io.opencensus:opencensus-impl-core:jar:0.10.1 got requested version
+  # io.opencensus:opencensus-exporter-trace-logging:jar:0.10.1 got requested version
+  # io.opencensus:opencensus-impl:jar:0.10.1 got requested version
+  native.maven_jar(
+      name = "io_opencensus_opencensus_api",
+      artifact = "io.opencensus:opencensus-api:0.10.1",
+      repository = "http://repo.maven.apache.org/maven2/",
+      sha1 = "1f5319c45aa3f4c879805f2a323d1ab6ba42e334",
+  )
+
+
+  # io.opencensus:opencensus-impl:jar:0.10.1
+  native.maven_jar(
+      name = "io_opencensus_opencensus_impl_core",
+      artifact = "io.opencensus:opencensus-impl-core:0.10.1",
+      repository = "http://repo.maven.apache.org/maven2/",
+      sha1 = "66b221c4388e3208000422954b4ba0248f7746ca",
+  )
+
+
+  native.maven_jar(
+      name = "io_opencensus_opencensus_impl",
+      artifact = "io.opencensus:opencensus-impl:0.10.1",
+      repository = "http://repo.maven.apache.org/maven2/",
+      sha1 = "6a96e07455946d43608a9bde4ed0663cd7c0fe56",
+  )
+
+def opencensus_java_libraries():
+  native.java_library(
+      name = "com_google_code_findbugs_jsr305",
+      visibility = ["//visibility:public"],
+      exports = ["@com_google_code_findbugs_jsr305//jar"],
+  )
+
+
+  native.java_library(
+      name = "io_grpc_grpc_context",
+      visibility = ["//visibility:public"],
+      exports = ["@io_grpc_grpc_context//jar"],
+  )
+
+
+  native.java_library(
+      name = "io_opencensus_opencensus_exporter_trace_logging",
+      visibility = ["//visibility:public"],
+      exports = ["@io_opencensus_opencensus_exporter_trace_logging//jar"],
+      runtime_deps = [
+          ":com_google_code_findbugs_jsr305",
+          ":com_google_errorprone_error_prone_annotations",
+          ":com_google_guava_guava",
+          ":io_opencensus_opencensus_api",
+      ],
+  )
+
+
+  native.java_library(
+      name = "com_google_errorprone_error_prone_annotations",
+      visibility = ["//visibility:public"],
+      exports = ["@com_google_errorprone_error_prone_annotations//jar"],
+  )
+
+
+  native.java_library(
+      name = "io_opencensus_opencensus_contrib_zpages",
+      visibility = ["//visibility:public"],
+      exports = ["@io_opencensus_opencensus_contrib_zpages//jar"],
+      runtime_deps = [
+          ":com_google_code_findbugs_jsr305",
+          ":com_google_errorprone_error_prone_annotations",
+          ":com_google_guava_guava",
+          ":io_opencensus_opencensus_api",
+      ],
+  )
+
+
+  native.java_library(
+      name = "com_lmax_disruptor",
+      visibility = ["//visibility:public"],
+      exports = ["@com_lmax_disruptor//jar"],
+  )
+
+
+  native.java_library(
+      name = "com_google_guava_guava",
+      visibility = ["//visibility:public"],
+      exports = ["@com_google_guava_guava//jar"],
+  )
+
+
+  native.java_library(
+      name = "io_opencensus_opencensus_api",
+      visibility = ["//visibility:public"],
+      exports = ["@io_opencensus_opencensus_api//jar"],
+      runtime_deps = [
+          ":com_google_code_findbugs_jsr305",
+          ":com_google_errorprone_error_prone_annotations",
+          ":com_google_guava_guava",
+          ":io_grpc_grpc_context",
+      ],
+  )
+
+
+  native.java_library(
+      name = "io_opencensus_opencensus_impl_core",
+      visibility = ["//visibility:public"],
+      exports = ["@io_opencensus_opencensus_impl_core//jar"],
+      runtime_deps = [
+          ":com_google_code_findbugs_jsr305",
+          ":com_google_errorprone_error_prone_annotations",
+          ":com_google_guava_guava",
+          ":io_opencensus_opencensus_api",
+      ],
+  )
+
+
+  native.java_library(
+      name = "io_opencensus_opencensus_impl",
+      visibility = ["//visibility:public"],
+      exports = ["@io_opencensus_opencensus_impl//jar"],
+      runtime_deps = [
+          ":com_google_code_findbugs_jsr305",
+          ":com_google_errorprone_error_prone_annotations",
+          ":com_google_guava_guava",
+          ":com_lmax_disruptor",
+          ":io_opencensus_opencensus_api",
+          ":io_opencensus_opencensus_impl_core",
+      ],
+  )