utils.h

SMS gateway. SMS protocol for CHINA mobile, unicom, lingtong. Using mysql to exchange message.

#ifndef __UTILS_H__
#define __UTILS_H__

typedef struct _HASH_NODE
{
	int nID;
	void *p;
	_HASH_NODE *pNextNode;
} HASH_NODE;

class HashTable
{
public:
	HashTable(int nInitialCapacity, float fLoadFactor);
	~HashTable();
	
	void *Get(int id);
	void Put(int id, void *p);
	void *Delete(int id);
	HASH_NODE *Enum();
	int GetSize();

private:
	/*
	 * Supplemental hash function
	 * This is needed to make the key more discrete, thus may improve the lookup performance.
	 *
	 * This function is same as the hash function of java.util.HashMap of Sun's Java2 SDK 1.4.
	 */
	int Hash(int key)
	{
		key += ~(key << 9);
		key ^=  (key >> 14);
		key +=  (key << 4);
		key ^=  (key >> 10);
		return key;
	}

	void Rebuild();
	
	float fLoadFactor;
	int nInitialCapacity, nCapacity, nSize;

	HASH_NODE **ppBuffer;
};

typedef struct _LINKED_LIST_NODE
{
	void *p;
	_LINKED_LIST_NODE *pPrevNode;
	_LINKED_LIST_NODE *pNextNode;
} LINKED_LIST_NODE;

class FIFO
{
public:
	FIFO();
	~FIFO();

	void Put(void *pConn);
	void *Get();
	void *Peek();

private:
	int nSize;
	LINKED_LIST_NODE *pIdlePool;
};

#endif	// #ifndef __UTILS_H__