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// This file is part of CAF, the C++ Actor Framework. See the file LICENSE in
// the main distribution directory for license terms and copyright or visit
// https://github.com/actor-framework/actor-framework/blob/master/LICENSE.
#define CAF_SUITE policy.select_any
#include "caf/policy/select_any.hpp"
#include "core-test.hpp"
#include "caf/actor_system.hpp"
#include "caf/event_based_actor.hpp"
#include "caf/sec.hpp"
using caf::policy::select_any;
using namespace caf;
namespace {
struct fixture : test_coordinator_fixture<> {
template <class F>
actor make_server(F f) {
auto init = [f]() -> behavior {
return {
[f](int x, int y) { return f(x, y); },
};
};
return sys.spawn(init);
}
auto make_error_handler() {
return [](const error& err) { CAF_FAIL("unexpected error: " << err); };
}
auto make_counting_error_handler(size_t* count) {
return [count](const error&) { *count += 1; };
}
template <class... ResponseHandles>
auto fuse(ResponseHandles&... handles) {
return select_any<detail::type_list<int>>{
{handles.id()...},
disposable::make_composite({handles.policy().pending_timeouts()...})};
}
};
} // namespace
#define SUBTEST(message) \
run(); \
MESSAGE("subtest: " message); \
for (int subtest_dummy = 0; subtest_dummy < 1; ++subtest_dummy)
BEGIN_FIXTURE_SCOPE(fixture)
CAF_TEST(select_any picks the first arriving integer) {
auto f = [](int x, int y) { return x + y; };
auto server1 = make_server(f);
auto server2 = make_server(f);
SUBTEST("request.receive") {
SUBTEST("single integer") {
auto r1 = self->request(server1, infinite, 1, 2);
auto r2 = self->request(server2, infinite, 2, 3);
auto choose = fuse(r1, r2);
run();
choose.receive(
self.ptr(), [](int result) { CHECK_EQ(result, 3); },
make_error_handler());
}
}
SUBTEST("request.then") {
int result = 0;
auto client = sys.spawn([=, &result](event_based_actor* client_ptr) {
auto r1 = client_ptr->request(server1, infinite, 1, 2);
auto r2 = client_ptr->request(server2, infinite, 2, 3);
auto choose = fuse(r1, r2);
choose.then(
client_ptr, [&result](int x) { result = x; }, make_error_handler());
});
run_once();
expect((int, int), from(client).to(server1).with(1, 2));
expect((int, int), from(client).to(server2).with(2, 3));
expect((int), from(server1).to(client).with(3));
expect((int), from(server2).to(client).with(5));
MESSAGE("request.then picks the first arriving result");
CHECK_EQ(result, 3);
}
SUBTEST("request.await") {
int result = 0;
auto client = sys.spawn([=, &result](event_based_actor* client_ptr) {
auto r1 = client_ptr->request(server1, infinite, 1, 2);
auto r2 = client_ptr->request(server2, infinite, 2, 3);
auto choose = fuse(r1, r2);
choose.await(
client_ptr, [&result](int x) { result = x; }, make_error_handler());
});
run_once();
expect((int, int), from(client).to(server1).with(1, 2));
expect((int, int), from(client).to(server2).with(2, 3));
// TODO: DSL (mailbox.peek) cannot deal with receivers that skip messages.
// expect((int), from(server1).to(client).with(3));
// expect((int), from(server2).to(client).with(5));
run();
MESSAGE("request.await froces responses into reverse request order");
CHECK_EQ(result, 5);
}
}
CAF_TEST(select_any calls the error handler at most once) {
auto f = [](int, int) -> result<int> { return sec::invalid_argument; };
auto server1 = make_server(f);
auto server2 = make_server(f);
SUBTEST("request.receive") {
auto r1 = self->request(server1, infinite, 1, 2);
auto r2 = self->request(server2, infinite, 2, 3);
auto choose = fuse(r1, r2);
run();
size_t errors = 0;
choose.receive(
self.ptr(),
[](int) { CAF_FAIL("fan-in policy called the result handler"); },
make_counting_error_handler(&errors));
CHECK_EQ(errors, 1u);
}
SUBTEST("request.then") {
size_t errors = 0;
auto client = sys.spawn([=, &errors](event_based_actor* client_ptr) {
auto r1 = client_ptr->request(server1, infinite, 1, 2);
auto r2 = client_ptr->request(server2, infinite, 2, 3);
auto choose = fuse(r1, r2);
choose.then(
client_ptr,
[](int) { CAF_FAIL("fan-in policy called the result handler"); },
make_counting_error_handler(&errors));
});
run_once();
expect((int, int), from(client).to(server1).with(1, 2));
expect((int, int), from(client).to(server2).with(2, 3));
expect((error), from(server1).to(client).with(sec::invalid_argument));
expect((error), from(server2).to(client).with(sec::invalid_argument));
CHECK_EQ(errors, 1u);
}
SUBTEST("request.await") {
size_t errors = 0;
auto client = sys.spawn([=, &errors](event_based_actor* client_ptr) {
auto r1 = client_ptr->request(server1, infinite, 1, 2);
auto r2 = client_ptr->request(server2, infinite, 2, 3);
auto choose = fuse(r1, r2);
choose.await(
client_ptr,
[](int) { CAF_FAIL("fan-in policy called the result handler"); },
make_counting_error_handler(&errors));
});
run_once();
expect((int, int), from(client).to(server1).with(1, 2));
expect((int, int), from(client).to(server2).with(2, 3));
// TODO: DSL (mailbox.peek) cannot deal with receivers that skip messages.
// expect((int), from(server1).to(client).with(3));
// expect((int), from(server2).to(client).with(5));
run();
CHECK_EQ(errors, 1u);
}
}
END_FIXTURE_SCOPE()
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