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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 selective_streaming
#include "core-test.hpp"
#include <memory>
#include <numeric>
#include "caf/actor_system.hpp"
#include "caf/actor_system_config.hpp"
#include "caf/attach_continuous_stream_stage.hpp"
#include "caf/attach_stream_sink.hpp"
#include "caf/attach_stream_source.hpp"
#include "caf/broadcast_downstream_manager.hpp"
#include "caf/event_based_actor.hpp"
#include "caf/stateful_actor.hpp"
using namespace caf;
namespace {
using value_type = std::pair<level, std::string>;
struct select {
static bool apply(level x, const value_type& y) noexcept {
return x == level::all || x == y.first;
}
bool operator()(level x, const value_type& y) const noexcept {
return apply(x, y);
}
};
using manager_type = broadcast_downstream_manager<value_type, level, select>;
using buf = std::vector<value_type>;
buf make_log(level lvl) {
buf result{{level::trace, "trace1"},
{level::trace, "trace2"},
{level::debug, "debug1"},
{level::error, "error1"},
{level::trace, "trace3"}};
auto predicate = [=](const value_type& x) { return !select::apply(lvl, x); };
auto e = result.end();
auto i = std::remove_if(result.begin(), e, predicate);
if (i != e)
result.erase(i, e);
return result;
}
TESTEE_SETUP();
TESTEE(log_producer) {
return {
[=](level lvl) -> result<stream<value_type>> {
auto res = attach_stream_source(
self,
// initialize state
[=](buf& xs) { xs = make_log(lvl); },
// get next element
[](buf& xs, downstream<value_type>& out, size_t num) {
MESSAGE("push " << num << " messages downstream");
auto n = std::min(num, xs.size());
for (size_t i = 0; i < n; ++i)
out.push(xs[i]);
xs.erase(xs.begin(), xs.begin() + static_cast<ptrdiff_t>(n));
},
// check whether we reached the end
[=](const buf& xs) {
if (xs.empty()) {
MESSAGE(self->name() << " is done");
return true;
}
return false;
},
unit, policy::arg<manager_type>::value);
auto& out = res.ptr()->out();
static_assert(std::is_same<decltype(out), manager_type&>::value,
"source has wrong manager_type type");
out.set_filter(res.outbound_slot(), lvl);
return res;
},
};
}
TESTEE_STATE(log_dispatcher) {
stream_stage_ptr<value_type, manager_type> stage;
};
TESTEE(log_dispatcher) {
self->state.stage = attach_continuous_stream_stage(
self,
// initialize state
[](unit_t&) {
// nop
},
// processing step
[](unit_t&, downstream<value_type>& out, value_type x) {
out.push(std::move(x));
},
// cleanup
[=](unit_t&, const error&) { MESSAGE(self->name() << " is done"); },
policy::arg<manager_type>::value);
return {
[=](join_atom, level lvl) {
auto& stg = self->state.stage;
MESSAGE("received 'join' request");
auto result = stg->add_outbound_path();
stg->out().set_filter(result, lvl);
return result;
},
[=](const stream<value_type>& in) {
self->state.stage->add_inbound_path(in);
},
};
}
TESTEE_STATE(log_consumer) {
std::vector<value_type> log;
};
TESTEE(log_consumer) {
return {
[=](stream<value_type>& in) {
return attach_stream_sink(
self,
// input stream
in,
// initialize state
[=](unit_t&) {
// nop
},
// processing step
[=](unit_t&, value_type x) {
self->state.log.emplace_back(std::move(x));
},
// cleanup and produce result message
[=](unit_t&, const error&) { MESSAGE(self->name() << " is done"); });
},
};
}
} // namespace
// -- unit tests ---------------------------------------------------------------
BEGIN_FIXTURE_SCOPE(test_coordinator_fixture<>)
CAF_TEST(select_all) {
auto src = sys.spawn(log_producer);
auto snk = sys.spawn(log_consumer);
MESSAGE(CAF_ARG(self) << CAF_ARG(src) << CAF_ARG(snk));
MESSAGE("initiate stream handshake");
self->send(snk * src, level::all);
run();
CHECK_EQ(deref<log_consumer_actor>(snk).state.log, make_log(level::all));
}
CAF_TEST(select_trace) {
auto src = sys.spawn(log_producer);
auto snk = sys.spawn(log_consumer);
MESSAGE(CAF_ARG(self) << CAF_ARG(src) << CAF_ARG(snk));
MESSAGE("initiate stream handshake");
self->send(snk * src, level::trace);
run();
CHECK_EQ(deref<log_consumer_actor>(snk).state.log, make_log(level::trace));
}
CAF_TEST(forking) {
auto src = sys.spawn(log_producer);
auto stg = sys.spawn(log_dispatcher);
auto snk1 = sys.spawn(log_consumer);
auto snk2 = sys.spawn(log_consumer);
sched.run();
self->send(stg * src, level::all);
self->send(snk1 * stg, join_atom_v, level::trace);
self->send(snk2 * stg, join_atom_v, level::error);
sched.run();
auto& st = deref<log_dispatcher_actor>(stg).state;
run_until([&] {
return st.stage->inbound_paths().empty() && st.stage->out().clean();
});
CHECK_EQ(deref<log_consumer_actor>(snk1).state.log, make_log(level::trace));
CHECK_EQ(deref<log_consumer_actor>(snk2).state.log, make_log(level::error));
self->send(stg, exit_reason::kill);
}
END_FIXTURE_SCOPE()
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