??? 我所做的工作上的程序主要是處理‘消息’的，簡單點就是將‘消息’從一端搬到另一端，這樣的過程就需要一個對象負責記錄搬運次數，這個對象可以叫做‘統計’對象－－CStatObject。
??? 在開始寫統計對象時，我一直是根據有幾個統計項，就定義幾個統計變量，樣子類似如下：
#ifndef?__STATOBJECT_H__
#define?__STATOBJECT_H__
#include?<iostream>
class?CStatObject
{
public:
????enum?StatType?{?ST_SOAP_NOTIFY?=?0,?ST_SOAP_SEND,?ST_APP_NOTIFY,?ST_APP_SEND?};
public:
????CStatObject();
????virtual?~CStatObject()?{}
????void?Init();
????int?Inc(StatType?type,?bool?req);
????void?Show(std::ostream&?os)?const;
private:
????size_t?m_szSOAPNotifyReq;
????size_t?m_szSOAPSendReq;
????size_t?m_szAppNotifyReq;
????size_t?m_szAppSendReq;
??? size_t?m_szSOAPNotifyResp;
????size_t?m_szSOAPSendResp;
????size_t?m_szAppNotifyResp;
????size_t?m_szAppSendResp;
};
#endif
??? 如上代碼可以看出，如果需要統計的項目過多時，變量的定義就變成一個很繁瑣的事情。因此，根據統計項的特點－－每個統計項目都有請求和應答兩項，于是，再簡化如下：
#ifndef?__STATOBJECT_H__
#define?__STATOBJECT_H__
#include?<iostream>
#include <map>
class?CStatObject
{
public:
????enum?StatType?{?ST_SOAP_NOTIFY?=?0,?ST_SOAP_SEND,?ST_APP_NOTIFY,?ST_APP_SEND?};
????typedef?std::pair<size_t,?size_t>?TCountPair;
public:
????CStatObject();
????virtual?~CStatObject()?{}
????void?Init();
????int?Inc(StatType?type,?bool?req);
????void?Show(std::ostream&?os)?const;
private:
????TCountPair?m_szSOAPNotify;
????TCountPair?m_szSOAPSend;
????TCountPair?m_szAppNotify;
????TCountPair?m_szAppSend;
};
#endif
??? 嗯，省了一半。但要是統計項目本身很多時，還是會需要定義很多的變量，于是，再次精簡如下：
#ifndef?__STATOBJECT_H__
#define?__STATOBJECT_H__
#include?<iostream>
#include?<map>
class?CStatObject
{
public:
????enum?StatType?{?ST_SOAP_NOTIFY?=?0,?ST_SOAP_SEND,?ST_APP_NOTIFY,?ST_APP_SEND?};
????typedef?std::pair<size_t,?size_t>?TCountPair;
????typedef?std::map<StatType,?TCountPair>?TStatMap;
public:
????CStatObject();
????virtual?~CStatObject()?{}
????void?Init();
????int?Inc(StatType?type,?bool?req);
????void?Show(std::ostream&?os)?const;
private:
????TStatMap?_mapStat;
};
#endif
??? 嘿嘿，現在這個樣子，不論統計項目如何變化，變量永遠就這一個了～總結來說：偷懶使人進步～
??? 這里是實現部分，一樣的繁瑣，但比前兩種，還是省了很多行代碼的～
#include?"StatObject.h"
CStatObject?g_stStatObject;
CStatObject::CStatObject()
{
????Init();
}
void?CStatObject::Init()
{
????_mapStat.clear();
????_mapStat.insert(std::make_pair(ST_SOAP_NOTIFY,?std::make_pair(0,0)));
????_mapStat.insert(std::make_pair(ST_SOAP_SEND,?std::make_pair(0,0)));
????_mapStat.insert(std::make_pair(ST_APP_NOTIFY,?std::make_pair(0,0)));
????_mapStat.insert(std::make_pair(ST_APP_SEND,?std::make_pair(0,0)));
}
int?CStatObject::Inc(CStatObject::StatType?type,?bool?req)
{
????TStatMap::iterator?it?=?_mapStat.find(type);
????if(it?==?_mapStat.end())
????????return?-1;
????if(req)
????????++?it->second.first;
????else
????????++?it->second.second;
????return?0;????
}
void?CStatObject::Show(std::ostream&?os)?const
{
????os?<<?"\n---?Stat?Info?---";
????for(TStatMap::const_iterator?it?=?_mapStat.begin();?it?!=?_mapStat.end();?++?it)
????{
????????switch(it->first)
????????{
????????case?ST_SOAP_NOTIFY:
????????????os?<<?"\nSOAP?Notify?=?";
????????????break;
????????case?ST_SOAP_SEND:
????????????os?<<?"\nSOAP?Send?=?";
????????????break;
????????case?ST_APP_NOTIFY:
????????????os?<<?"\nApp?Notify?=?";
????????????break;
????????case?ST_APP_SEND:
????????????os?<<?"\nApp?Send?=?";
????????????break;
????????default:
????????????os?<<?"\nIMPOSSIBLE?=?";
????????}
????????os?<<?it->second.first?<<?"/"?<<?it->second.second?<<?"(req/resp)";
????}
}