#ifndef PIP_TESTS_EXECUTOR_H
#define PIP_TESTS_EXECUTOR_H

#include "piblockingdequeue.h"

/**
 * @brief Thread pools address two different problems: they usually provide improved performance when executing large
 * numbers of asynchronous tasks, due to reduced per-task invocation overhead, and they provide a means of bounding and
 * managing the resources, including threads, consumed when executing a collection of tasks.
 */
class PIThreadPoolExecutor {
public:
	explicit PIThreadPoolExecutor(size_t corePoolSize = 1, PIBlockingDequeue<std::function<void()> >* taskQueue_ = new PIBlockingDequeue<std::function<void()> >());

	virtual ~PIThreadPoolExecutor();

	/**
	 * @brief Executes the given task sometime in the future. The task execute in an existing pooled thread. If the task
	 * cannot be submitted for execution, either because this executor has been shutdown or because its capacity has been
	 * reached.
	 *
	 * @param runnable not empty function for thread pool execution
	 */
	void execute(const std::function<void()>& runnable);

	void shutdownNow();

	/**
	 * @brief Initiates an orderly shutdown in which previously submitted tasks are executed, but no new tasks will be
	 * accepted. Invocation has no additional effect if already shut down. This method does not wait for previously
	 * submitted tasks to complete execution. Use awaitTermination to do that.
	 */
	void shutdown();

	volatile bool isShutdown() const;

	bool awaitTermination(int timeoutMs);
private:
	volatile bool isShutdown_;
	PIBlockingDequeue<std::function<void()> >* taskQueue;
	PIVector<PIThread*> threadPool;
};

#endif //PIP_TESTS_EXECUTOR_H