westonpace commented on a change in pull request #10258:
URL: https://github.com/apache/arrow/pull/10258#discussion_r643636361
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File path: cpp/src/arrow/util/future_test.cc
##########
@@ -952,6 +951,85 @@ TEST(FutureCompletionTest, FutureVoid) {
}
}
+class FutureSchedulingTest : public testing::Test {
+ public:
+ internal::Executor* executor() { return mock_executor.get(); }
+ int spawn_count() { return mock_executor->spawn_count; }
+
+ std::function<void(const Status&)> callback = [](const Status&) {};
+ std::shared_ptr<MockExecutor> mock_executor =
std::make_shared<MockExecutor>();
+};
+
+TEST_F(FutureSchedulingTest, ScheduleAlways) {
+ CallbackOptions options;
+ options.should_schedule = ShouldSchedule::ALWAYS;
+ options.executor = executor();
+ // Successful future
+ {
+ auto fut = Future<>::Make();
+ fut.AddCallback(callback, options);
+ fut.MarkFinished();
+ fut.AddCallback(callback, options);
+ ASSERT_EQ(2, spawn_count());
+ }
+ // Failing future
+ {
+ auto fut = Future<>::Make();
+ fut.AddCallback(callback, options);
+ fut.MarkFinished(Status::Invalid("XYZ"));
+ fut.AddCallback(callback, options);
+ ASSERT_EQ(4, spawn_count());
+ }
+}
+
+TEST_F(FutureSchedulingTest, ScheduleIfUnfinished) {
+ CallbackOptions options;
+ options.should_schedule = ShouldSchedule::IF_UNFINISHED;
+ options.executor = executor();
+ // Successful future
+ {
+ auto fut = Future<>::Make();
+ fut.AddCallback(callback, options);
+ fut.MarkFinished();
+ fut.AddCallback(callback, options);
+ ASSERT_EQ(1, spawn_count());
+ }
+ // Failing future
+ {
+ auto fut = Future<>::Make();
+ fut.AddCallback(callback, options);
+ fut.MarkFinished(Status::Invalid("XYZ"));
+ fut.AddCallback(callback, options);
+ ASSERT_EQ(2, spawn_count());
+ }
+}
+
+class DelayedExecutor : public internal::Executor {
Review comment:
My rationale was only that `DelayedExecutor` is only used in
`future_test.cc` while `MockExecutor` is used in `future_test.cc` and
`thread_pool_test.cc` but I see your point. I'll move this into
`test_common.h`.
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