#ifndef QFACTORY_H
#define QFACTORY_H  
#include "usg_common.h"
#include "mm.h"
#include "hashtable.h"
#include "lock_free_queue.h"

class QueueFactory{
private:

	static hashtable_t * getHashTable() {
		static hashtable_t *hashtable = NULL;
		int first;
		  
		if(hashtable == NULL) {
			first = mm_init(sizeof(hashtable_t), (void **)&hashtable);
			if (first)
			   hashtable_init(hashtable);
		}
		return hashtable;
		
	}

	 

	template <typename T> static
	LockFreeQueue<T>* createArrayLockFreeQueue(int key, size_t size=16) {
		 
		LockFreeQueue<T> *queue;
		hashtable_t *hashtable = getHashTable();
		//LockFreeQueue<int, 10000> q;
		if ((queue = (LockFreeQueue<T> *)hashtable_get(hashtable, key)) == NULL ) {
			queue = new LockFreeQueue<T>(size);
			hashtable_put(hashtable,  key, (void *)queue);
		}

		return queue;
	}

public:

	template <typename T> static
	LockFreeQueue<T>* createQueue(int key, size_t size = 16) {
		return QueueFactory::createArrayLockFreeQueue<T>(key, size);
	}

	/**
	 * destroy queue
	*/
	template <typename T> static
	void dropQueue(int key) {
		LockFreeQueue<T> *queue = QueueFactory::createQueue<T> (key);
		delete queue;
		hashtable_t *hashtable = getHashTable();
		hashtable_remove(hashtable, key);
	}

};
#endif