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examples/simulations/rollback-policy/main.cpp

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+#include "simulation.hpp"
+
+#include <exception>
+#include <iostream>
+#include <string>
+
+namespace model = ota::rollback;
+
+namespace {
+
+    void usage(std::ostream &output) {
+        output << "Usage: rollback-simulate [all|SCENARIO|--help]\nScenarios:\n";
+        for (const auto &scenario: model::scenarios()) output << "  " << scenario << '\n';
+    }
+
+    void run(const std::string &scenario) {
+        const auto result = model::run_scenario(scenario);
+        std::cout << scenario << ": " << model::name(result.phase)
+                  << "; running=" << (result.running == model::Slot::A ? "A" : "B")
+                  << "; boots=" << result.boots_requested
+                  << "; attempts-left=" << result.attempts_left
+                  << "; records-lost=" << result.records_lost
+                  << "; failed-release-blocked=" << (result.blocked_releases.count(result.failed_release) != 0)
+                  << "; " << result.recovery_reason << '\n';
+    }
+
+}// namespace
+
+int main(int argc, char **argv) {
+    if (argc == 2 && std::string(argv[1]) == "--help") {
+        usage(std::cout);
+        return 0;
+    }
+    if (argc > 2) {
+        usage(std::cerr);
+        return 1;
+    }
+    try {
+        const std::string requested = argc == 2 ? argv[1] : "all";
+        if (requested == "all") {
+            for (const auto &scenario: model::scenarios()) run(scenario);
+        } else
+            run(requested);
+    } catch (const std::exception &error) {
+        std::cerr << error.what() << '\n';
+        usage(std::cerr);
+        return 1;
+    }
+}