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#include "common.hh"
#include <unordered_map>
#include "fake_monitor.hh"
#include "looper.hh"
#include "observers.hh"
namespace {
class FakeMonitorImpl : public Monitor {
public:
explicit FakeMonitorImpl(std::shared_ptr<Looper> const& looper)
: looper_(looper), timer_(0), host_id_(0), job_id_(0), max_jobs_(0) {
}
~FakeMonitorImpl() override {
disconnect();
}
void connect(std::string const&, std::string const&,
uint16_t) override {
disconnect();
timer_ = looper_->schedule(
(rand() % 500) / 1000.0,
std::bind(&FakeMonitorImpl::fake_connect, this,
std::placeholders::_1,
std::placeholders::_2));
}
void disconnect() override {
if (timer_) {
looper_->cancel(timer_);
timer_ = 0;
}
machines_.clear();
auto observer = observers_.first();
while (observer) {
observer->state(this, SEARCHING);
observer = observers_.next();
}
}
size_t machines() const override {
return machines_.size();
}
uint32_t id(size_t index) const override {
auto it = machines_.begin();
while (index--) ++it;
if (it == machines_.end()) {
assert(false);
return static_cast<uint32_t>(-1);
}
return it->first;
}
Machine machine_at(size_t index) const override {
auto it = machines_.begin();
while (index--) ++it;
if (it == machines_.end()) {
assert(false);
return Machine();
}
return it->second.data;
}
Machine machine(uint32_t id) const override {
auto it = machines_.find(id);
if (it == machines_.end()) {
assert(false);
return Machine();
}
return it->second.data;
}
void add_observer(Observer* observer) override {
observers_.add(observer);
}
void remove_observer(Observer* observer) override {
observers_.remove(observer);
}
#if FAKE_MONITOR
void toggle_fakes() override {
if (timer_) {
looper_->cancel(timer_);
timer_ = 0;
#if 0
remove_jobs((jobs_.size() * 3) / 4);
#else
auto index = rand() % machines_.size();
auto it = machines_.begin();
while (index--) ++it;
auto id = it->first;
machines_.erase(it);
auto jit = jobs_.begin();
while (jit != jobs_.end()) {
if (jit->second.worker == id) {
jit = jobs_.erase(jit);
} else {
++jit;
}
}
auto observer = observers_.first();
while (observer) {
observer->removed_machine(this, id);
observer = observers_.next();
}
#endif
} else {
schedule_jobs();
}
}
#endif
private:
struct Job {
uint32_t const host;
uint32_t const worker;
Job(uint32_t host, uint32_t worker)
: host(host), worker(worker) {
}
};
struct Entry {
Machine data;
unsigned active;
};
void fake_connect(Looper*, uint32_t) {
timer_ = 0;
auto observer = observers_.first();
while (observer) {
observer->state(this, CONNECTED);
observer = observers_.next();
}
add_machine("alice", 4);
add_machine("bob", 10);
add_machine("DeuX", 22);
add_machine("machine1", 4);
add_machine("machine2", 4);
add_machine("machine3", 4);
add_machine("machine4", 4);
add_machine("machine5", 4);
add_machine("machine6", 4);
add_machine("machine7", 4);
add_machine("machine8", 4);
schedule_jobs();
}
void add_machine(std::string const& name, unsigned max_jobs) {
auto id = ++host_id_;
auto& entry = machines_[id];
entry.data.name = name;
entry.data.max_jobs = max_jobs;
entry.active = 0;
max_jobs_ += max_jobs;
auto observer = observers_.first();
while (observer) {
observer->added_machine(this, id);
observer = observers_.next();
}
}
void schedule_jobs() {
assert(timer_ == 0);
timer_ = looper_->schedule(
(rand() % 2000) / 1000.0,
std::bind(&FakeMonitorImpl::fiddle_jobs, this,
std::placeholders::_1,
std::placeholders::_2));
}
void remove_jobs(size_t remove) {
while (remove--) {
auto it = jobs_.begin();
auto job = it->second;
jobs_.erase(it);
machines_[job.worker].active--;
auto observer = observers_.first();
while (observer) {
observer->removed_job(this, job.host, job.worker);
observer = observers_.next();
}
}
}
void fiddle_jobs(Looper*, uint32_t) {
timer_ = 0;
remove_jobs(!jobs_.empty() ? rand() % jobs_.size() : 0);
auto avail = (max_jobs_ * 7) / 8 - jobs_.size();
auto add = avail ? rand() % avail : 0;
while (add--) {
auto id = ++job_id_;
while (jobs_.count(id)) {
id = ++job_id_;
}
auto host = rand() % machines_.size();
auto target = rand() % machines_.size();
do {
auto tgtid = this->id(target);
auto& entry = machines_[tgtid];
if (entry.active < entry.data.max_jobs) {
entry.active++;
add_job(id, host != target ? this->id(host) : tgtid, tgtid);
break;
}
target = rand() % machines_.size();
} while (true);
}
schedule_jobs();
}
void add_job(uint32_t job_id, uint32_t host, uint32_t worker) {
jobs_.insert(std::make_pair(job_id, Job(host, worker)));
auto observer = observers_.first();
while (observer) {
observer->added_job(this, host, worker);
observer = observers_.next();
}
}
std::shared_ptr<Looper> looper_;
uint32_t timer_;
uint32_t host_id_;
uint32_t job_id_;
size_t max_jobs_;
std::unordered_map<uint32_t, Entry> machines_;
Observers<Observer> observers_;
std::unordered_map<uint32_t, Job> jobs_;
};
} // namespace
// static
std::unique_ptr<Monitor> FakeMonitor::create(
std::shared_ptr<Looper> const& looper) {
return std::make_unique<FakeMonitorImpl>(looper);
}
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