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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 continuous_streaming
#include "caf/attach_continuous_stream_stage.hpp"
#include "core-test.hpp"
#include <memory>
#include <numeric>
#include "caf/actor_system.hpp"
#include "caf/actor_system_config.hpp"
#include "caf/attach_stream_sink.hpp"
#include "caf/event_based_actor.hpp"
#include "caf/stateful_actor.hpp"
using std::string;
using namespace caf;
namespace {
/// Returns the sum of natural numbers up until `n`, i.e., 1 + 2 + ... + n.
int32_t sum(int32_t n) {
return (n * (n + 1)) / 2;
}
TESTEE_SETUP();
TESTEE_STATE(file_reader) {
std::vector<int32_t> buf;
};
VARARGS_TESTEE(file_reader, size_t buf_size) {
return {
[=](string& fname) -> result<stream<int32_t>, string> {
CHECK_EQ(fname, "numbers.txt");
CHECK_EQ(self->mailbox().empty(), true);
return attach_stream_source(
self,
// forward file name in handshake to next stage
std::forward_as_tuple(std::move(fname)),
// initialize state
[=](unit_t&) {
auto& xs = self->state.buf;
xs.resize(buf_size);
std::iota(xs.begin(), xs.end(), 1);
},
// get next element
[=](unit_t&, downstream<int32_t>& out, size_t num) {
auto& xs = self->state.buf;
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 unit_t&) {
if (self->state.buf.empty()) {
MESSAGE(self->name() << " is done");
return true;
}
return false;
});
},
};
}
TESTEE_STATE(sum_up) {
int32_t x = 0;
};
TESTEE(sum_up) {
return {
[=](stream<int32_t>& in, const string& fname) {
CHECK_EQ(fname, "numbers.txt");
using int_ptr = int32_t*;
return attach_stream_sink(
self,
// input stream
in,
// initialize state
[=](int_ptr& x) { x = &self->state.x; },
// processing step
[](int_ptr& x, int32_t y) { *x += y; },
// cleanup
[=](int_ptr&, const error&) { MESSAGE(self->name() << " is done"); });
},
[=](join_atom atm, actor src) {
MESSAGE(self->name() << " joins a stream");
self->send(self * src, atm);
},
};
}
TESTEE_STATE(stream_multiplexer) {
stream_stage_ptr<int32_t, broadcast_downstream_manager<int32_t>> stage;
};
TESTEE(stream_multiplexer) {
self->state.stage = attach_continuous_stream_stage(
self,
// initialize state
[](unit_t&) {
// nop
},
// processing step
[](unit_t&, downstream<int32_t>& out, int32_t x) { out.push(x); },
// cleanup
[=](unit_t&, const error&) { MESSAGE(self->name() << " is done"); });
return {
[=](join_atom) {
MESSAGE("received 'join' request");
return self->state.stage->add_outbound_path(
std::make_tuple("numbers.txt"));
},
[=](const stream<int32_t>& in, std::string& fname) {
CHECK_EQ(fname, "numbers.txt");
return self->state.stage->add_inbound_path(in);
},
[=](close_atom, int32_t sink_index) {
auto& out = self->state.stage->out();
out.close(out.path_slots().at(static_cast<size_t>(sink_index)));
},
};
}
using fixture = test_coordinator_fixture<>;
} // namespace
// -- unit tests ---------------------------------------------------------------
BEGIN_FIXTURE_SCOPE(fixture)
CAF_TEST(depth_3_pipeline_with_fork) {
auto src = sys.spawn(file_reader, 60u);
auto stg = sys.spawn(stream_multiplexer);
auto snk1 = sys.spawn(sum_up);
auto snk2 = sys.spawn(sum_up);
auto& st = deref<stream_multiplexer_actor>(stg).state;
MESSAGE("connect sinks to the stage (fork)");
self->send(snk1, join_atom_v, stg);
self->send(snk2, join_atom_v, stg);
consume_messages();
CHECK_EQ(st.stage->out().num_paths(), 2u);
MESSAGE("connect source to the stage (fork)");
self->send(stg * src, "numbers.txt");
consume_messages();
CHECK_EQ(st.stage->out().num_paths(), 2u);
CHECK_EQ(st.stage->inbound_paths().size(), 1u);
run();
CHECK_EQ(st.stage->out().num_paths(), 2u);
CHECK_EQ(st.stage->inbound_paths().size(), 0u);
CHECK_EQ(deref<sum_up_actor>(snk1).state.x, sum(60));
CHECK_EQ(deref<sum_up_actor>(snk2).state.x, sum(60));
self->send_exit(stg, exit_reason::kill);
}
CAF_TEST(depth_3_pipeline_with_join) {
auto src1 = sys.spawn(file_reader, 60u);
auto src2 = sys.spawn(file_reader, 60u);
auto stg = sys.spawn(stream_multiplexer);
auto snk = sys.spawn(sum_up);
auto& st = deref<stream_multiplexer_actor>(stg).state;
MESSAGE("connect sink to the stage");
self->send(snk, join_atom_v, stg);
consume_messages();
CHECK_EQ(st.stage->out().num_paths(), 1u);
MESSAGE("connect sources to the stage (join)");
self->send(stg * src1, "numbers.txt");
self->send(stg * src2, "numbers.txt");
consume_messages();
CHECK_EQ(st.stage->out().num_paths(), 1u);
CHECK_EQ(st.stage->inbound_paths().size(), 2u);
run();
CHECK_EQ(st.stage->out().num_paths(), 1u);
CHECK_EQ(st.stage->inbound_paths().size(), 0u);
CHECK_EQ(deref<sum_up_actor>(snk).state.x, sum(60) * 2);
self->send_exit(stg, exit_reason::kill);
}
END_FIXTURE_SCOPE()
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