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139 lines
3.2 KiB
139 lines
3.2 KiB
#include <thread>
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#include "catch2/catch_all.hpp"
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#include "../LibSnugLog/include/disruptor.h"
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struct strategy {
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static constexpr overflow_response_t on_overflow = overflow_response_t::must_wait;
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void wait() {}
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};
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TEST_CASE("Disruptor works sequentially") {
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std::array<char, 8192> buffer{};
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disruptor<strategy> v{buffer.data(), buffer.size()};
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SECTION("117") {
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auto W = v.reserve_write(100);
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v[W.start] = 117;
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v.conclude_write(W);
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auto R = v.reserve_read();
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REQUIRE(v[R.start]== 117);
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v.conclude_read(R);
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}
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SECTION("12") {
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{
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auto W = v.reserve_write(6);
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v[W.start] = 12;
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v.conclude_write(W);
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auto R = v.reserve_read();
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REQUIRE(v[R.start]== 12);
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v.conclude_read(R);
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}
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{
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auto W = v.reserve_write(6);
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v[W.start] = 8;
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v.conclude_write(W);
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auto R = v.reserve_read();
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REQUIRE(v[R.start]== 8);
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v.conclude_read(R);
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}
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}
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SECTION("Disruptor loop around") {
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std::multiset<char> mset;
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for(int i = 0; i != 255; i++) {
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auto W = v.reserve_write(100);
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v[W.start] = (char)i;
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for(size_t idx = W.start; idx != W.end; idx = (idx+1)%v.size()) {
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v[idx] = (char)i;
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}
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v.conclude_write(W);
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auto R = v.reserve_read();
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for(size_t idx = R.start; idx != R.end; idx = (idx+1)%v.size()) {
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mset.insert(v[idx]);
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}
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v.conclude_read(R);
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}
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for(int i = 0; i != 255; i++) {
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REQUIRE(mset.count((char)i) == 100);
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}
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}
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SECTION("Disruptor concurrent odd vs even") {
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std::atomic<bool> trigger = false;
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std::multiset<char> mset;
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std::stringstream continuity;
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int acc = 0;
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for(int i = 0; i<= 255; i++) {
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acc+=i;
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}
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std::thread reader([&](){
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int cnt = 0;
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while (cnt != acc) {
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auto R = v.reserve_read();
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for (size_t idx = R.start; idx != R.end; idx = (idx + 1) % v.size()) {
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mset.insert(v[idx]);
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continuity << (char)v[idx];
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}
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v.conclude_read(R);
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cnt += (R.end > R.start) * (R.end - R.start)
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+ (R.end < R.start) * (v.size() - R.start + R.end);
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}
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});
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std::thread even([&]() {
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while(!trigger.load());
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for (int i = 2; i <= 255; i += 2) {
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auto W = v.reserve_write(i);
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v[W.start] = (char) i;
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for (size_t idx = W.start; idx != W.end; idx = (idx + 1) % v.size()) {
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v[idx] = (char) i;
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}
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v.conclude_write(W);
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}
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});
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std::thread odd([&]() {
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while(!trigger.load());
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for (int i = 1; i <= 255; i += 2) {
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auto W = v.reserve_write(i);
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v[W.start] = (char) i;
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for (size_t idx = W.start; idx != W.end; idx = (idx + 1) % v.size()) {
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v[idx] = (char) i;
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}
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v.conclude_write(W);
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}
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});
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// byte received count test
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trigger.store(true);
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reader.join(); even.join(); odd.join();
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for(int i = 1; i <= 255; i++) {
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REQUIRE(mset.count((char)i) == i);
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}
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// Continuity tests
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int changes = 0;
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auto str = continuity.str();
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char current = *str.begin();
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auto it = str.begin();
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for(;it != str.end();) {
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while(it != str.end() && *it == current) {++it;}
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changes += 1;
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current = *it;
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}
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REQUIRE(changes == 255);
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}
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}
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TEST_CASE("Fails if buffer too small") {
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REQUIRE_THROWS_AS(disruptor<OverflowWait>(nullptr, page_size), disruptor_exception);
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}
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TEST_CASE("Fails if buffer size is 0") {
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REQUIRE_THROWS_AS(disruptor<OverflowWait>(nullptr, 0), disruptor_exception);
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}
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