//
// Created by fomenko on 23.09.2019.
//

#include "executor.h"

PIThreadPoolExecutor::PIThreadPoolExecutor(size_t corePoolSize, PIBlockingDequeue<std::function<void()>> *taskQueue_,
                                           PIThreadFactory *threadFactory) : isShutdown_(false), taskQueue(taskQueue_), threadFactory(threadFactory) {
    for (size_t i = 0; i < corePoolSize; ++i) {
        AbstractThread* thread = threadFactory->newThread([&, i](){
            auto runnable = taskQueue->poll(100, std::function<void()>());
            if (runnable) {
                runnable();
            } else if (isShutdown_) threadPool[i]->stop();
        });
        threadPool.push_back(thread);
        thread->start();
    }
}

bool PIThreadPoolExecutor::awaitTermination(int timeoutMs) {
    PITimeMeasurer measurer;
    for (size_t i = 0; i < threadPool.size(); ++i) {
        int dif = timeoutMs - (int)measurer.elapsed_m();
        if (dif < 0) return false;
        if (!threadPool[i]->waitForFinish(dif)) return false;
    }
    return true;
}

void PIThreadPoolExecutor::shutdownNow() {
    isShutdown_ = true;
    for (size_t i = 0; i < threadPool.size(); ++i) threadPool[i]->stop();
}

PIThreadPoolExecutor::~PIThreadPoolExecutor() {
    shutdownNow();
    taskQueue->getConditionVar()->notifyAll();
    while (threadPool.size() > 0) delete threadPool.take_back();
    delete threadFactory;
    delete taskQueue;
}

void PIThreadPoolExecutor::execute(const std::function<void()> &runnable) {
    if (!isShutdown_) taskQueue->offer(runnable);
}

volatile bool PIThreadPoolExecutor::isShutdown() const {
    return isShutdown_;
}