ACE自适配通信环境(ADAPTIVE Communication Environment)是可以自由使用、开放源码的面向对象(OO)框架(Framework),在其中实现了许多用于并发通信软件的核心模式。ACE提供了一组丰富的可复用C++ Wrapper Facade(包装外观)和框架组件,可跨越多种平台完成通用的通信软件任务,其中包括:事件多路分离和事件处理器分派、信号处理、服务初始化、进程间通信、共享内存管理、消息路由、分布式服务动态(重)配置、并发执行和同步,等等。
ACE的目标用户是高性能和实时通信服务和应用的开发者。它简化了使用进程间通信、事件多路分离、显式动态链接和并发的OO网络应用和服务的开发。此外,通过服务在运行时与应用的动态链接,ACE还使系统的配置和重配置得以自动化。
我最近采用ACE实现了一个通用的C/S架构通信程序,具体实现简述如下:
1. 服务器端:一个采用领导者/跟随者模型的线程池不断地接受从多个客户端发来的消息,并放入一个消息队列,然后又有一个采用半同步/半异步模型的线程池不断地从这个消息队列中取出消息进行处理。
服务器端代码如下:(共10个文件)
ACE_Server.cpp
#include "ace/SOCK_Acceptor.h"
#include "ace/Acceptor.h"
#include "ace/Thread_Manager.h"
#include "ace/TP_Reactor.h"
#include "ace/Reactor.h"
#include "ace/INET_Addr.h"
#include "ace/OS.h"
#include "Request_Handler.h"
#include "Server.h"
#include "Constants.h"
using namespace ACE_Server;
int main(int argc, char *argv[])
{
ACE_TP_Reactor tp_reactor;
ACE_Reactor reactor(&tp_reactor, 1);
ACE_Reactor::instance(&reactor, 1);
ACE_Acceptor<Request_Handler, ACE_SOCK_ACCEPTOR> acceptor;
ACE_INET_Addr addr(SERVER_PORT_NUM);
if(acceptor.open(addr) == -1)
return -1;
Server server_tp;
server_tp.activate(THR_NEW_LWP | THR_JOINABLE, SERVER_THREAD_POOL_SIZE);
ACE_Thread_Manager::instance()->wait();
return 0;
}
Constants.h
#ifndef __CONSTANTS_H_
#define __CONSTANTS_H_
namespace ACE_Server
{
static const size_t SERVER_THREAD_POOL_SIZE = 5; //进行数据接收的线程池大小
static const size_t TASK_THREAD_POOL_SIZE = 5; //进行数据处理的线程池大小
static const size_t BUFFER_SIZE = 4096; //数据缓冲区大小
static const size_t SERVER_PORT_NUM = 10101; //服务器的通信端口号
}
#endif
Server.h
#ifndef __SERVER_H_
#define __SERVER_H_
#include "ace/Task.h"
namespace ACE_Server
{
class Server: public ACE_Task_Base
{
public:
virtual int svc(void);
};
}
#endif
Server.cpp
#include "ace/Reactor.h"
#include "Server.h"
namespace ACE_Server
{
int Server::svc(void)
{
int result = ACE_Reactor::instance()->run_reactor_event_loop();
if(result == -1)
return -1;
return 0;
}
}
Request_Handler.h
#ifndef __REQUEST_HANDLER_H_
#define __REQUEST_HANDLER_H_
#include "ace/Svc_Handler.h"
#include "ace/SOCK_Stream.h"
#include "ace/Synch.h"
#include "ace/Thread_Manager.h"
#include "Task_Manager.h"
namespace ACE_Server
{
class Request_Handler: public ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_MT_SYNCH>
{
public:
Request_Handler(ACE_Thread_Manager *thr_mgr = 0);
protected:
virtual int handle_input(ACE_HANDLE fd = ACE_INVALID_HANDLE);
private:
static Task_Manager task_mgr;
};
}
#endif
Request_Handler.cpp
#include "ace/OS.h"
#include "ace/Message_Block.h"
#include "ace/Thread_Manager.h"
#include "ace/Svc_Handler.h"
#include "ace/SOCK_Stream.h"
#include "ace/Synch.h"
#include "ace/Reactor.h"
#include "Request_Handler.h"
#include "Task_Manager.h"
#include "Constants.h"
namespace ACE_Server
{
Task_Manager Request_Handler::task_mgr;
Request_Handler::Request_Handler(ACE_Thread_Manager *thr_mgr): ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_MT_SYNCH> (thr_mgr)
{
this->reactor(ACE_Reactor::instance());
task_mgr.activate();
}
int Request_Handler::handle_input(ACE_HANDLE fd)
{
char length[4] = {0};
if(this->peer().recv_n(length, 4) == 4)
{
size_t msg_len = 0;
for(int i = 0; i < 4; i++)
{
msg_len |= (size_t)length[i] << (8 * i);
}
char msg[BUFFER_SIZE] = {0};
if(this->peer().recv_n(msg, msg_len) == msg_len)
{
ACE_Message_Block *mb;
ACE_NEW_RETURN(mb, ACE_Message_Block(msg_len, ACE_Message_Block::MB_DATA, 0, msg), -1);
mb->wr_ptr(msg_len);
task_mgr.putq(mb);
return 0;
}
}
return -1;
}
}
Task_Manager.h
#ifndef __TASK_MANAGER_H_
#define __TASK_MANAGER_H_
#include "ace/Task.h"
#include "ace/Synch.h"
namespace ACE_Server
{
class Task_Manager: public ACE_Task<ACE_MT_SYNCH>
{
public:
virtual int svc(void);
};
}
#endif
Task_Manager.cpp
#include "ace/Message_Block.h"
#include "Task_Manager.h"
#include "Task_Worker.h"
#include "Constants.h"
namespace ACE_Server
{
int Task_Manager::svc(void)
{
Task_Worker task_tp;
task_tp.activate(THR_NEW_LWP | THR_JOINABLE, TASK_THREAD_POOL_SIZE);
while(1)
{
ACE_Message_Block *mb = NULL;
if(this->getq(mb) < 0)
{
task_tp.msg_queue()->deactivate();
task_tp.wait();
}
task_tp.putq(mb);
}
return 0;
}
}
Task_Worker.h
#ifndef __TASK_WORKER_H_
#define __TASK_WORKER_H_
#include "ace/Task.h"
#include "ace/Synch.h"
#include "ace/Message_Block.h"
namespace ACE_Server
{
class Task_Worker: public ACE_Task<ACE_MT_SYNCH>
{
public:
virtual int svc(void);
private:
void process_task(ACE_Message_Block *mb);
};
}
#endif
Task_Worker.cpp
#include "ace/OS.h"
#include "ace/Message_Block.h"
#include "Task_Worker.h"
namespace ACE_Server
{
int Task_Worker::svc(void)
{
while(1)
{
ACE_Message_Block *mb = NULL;
if(this->getq(mb) == -1)
{
continue;
}
process_task(mb);
}
return 0;
}
void Task_Worker::process_task(ACE_Message_Block *mb)
{
//进行数据处理,数据的起始地址为mb->rd_ptr(),长度为mb->length()
ACE_DEBUG((LM_DEBUG, ACE_TEXT("(%t) Processing task: %s length %d\n"), mb->rd_ptr(), mb->length()));
ACE_OS::sleep(3); //模拟数据处理过程
mb->release();
}
}
2. 客户端:应用程序将需要发送的若干消息放入一个消息队列,然后激活一个线程来发送所有消息到服务器端。
客户端代码如下:(共4个文件)
ACE_Client.cpp
#include "Client.h"
using namespace ACE_Client;
int main(int argc, char *argv[])
{
Client client("localhost"); //服务器的IP地址或者服务器名称
char *task1 = "Is it a good day?"; //第1个task的数据
size_t task1_len = 18; //第1个task的数据长度
char *task1_t; //无需修改
ACE_NEW_RETURN(task1_t, char(task1_len + 4), -1); //无需修改
client.put_task(task1_t, task1, task1_len); //无需修改
char *task2 = "Yeah, it really is."; //第2个task的数据
size_t task2_len = 20; //第2个task的数据长度
char *task2_t; //无需修改
ACE_NEW_RETURN(task2_t, char(task2_len + 4), -1); //无需修改
client.put_task(task2_t, task2, task2_len); //无需修改
client.send_tasks(); //将上面的task全部发到服务器
return 0;
}
Constants.h
#ifndef __CONSTANTS_H_
#define __CONSTANTS_H_
#include "ace/Time_Value.h"
namespace ACE_Client
{
static const size_t BUFFER_SIZE = 4096; //数据缓冲区大小
static const size_t SERVER_PORT_NUM = 10101; //服务器的通信端口号
static const ACE_Time_Value TIME_INTERVAL(0, 1000000); //两次数据发送之间的时间间隔(0 s + 1000000 us = 1 s)
}
#endif
Client.h
#ifndef __CLIENT_H_
#define __CLIENT_H_
#include "ace/Task.h"
#include "ace/INET_Addr.h"
#include "ace/Synch.h"
namespace ACE_Client
{
class Client: public ACE_Task<ACE_NULL_SYNCH>
{
public:
Client(char *server_ip);
virtual int svc(void);
char *put_task(char *msg_t, char *msg_s, size_t msg_len);
void send_tasks(void);
private:
ACE_INET_Addr addr;
};
}
#endif
Client.cpp
#include "ace/OS.h"
#include "ace/SOCK_Stream.h"
#include "ace/SOCK_Connector.h"
#include "ace/Message_Block.h"
#include "ace/Thread_Manager.h"
#include "ace/INET_Addr.h"
#include "Constants.h"
#include "Client.h"
namespace ACE_Client
{
Client::Client(char *server)
{
addr = ACE_INET_Addr(SERVER_PORT_NUM, server);
}
int Client::svc(void)
{
ACE_SOCK_Stream stream;
ACE_SOCK_Connector connector;
if(connector.connect(stream, addr) < 0)
{
return -1;
}
else
{
while(1)
{
ACE_Message_Block *mb = NULL;
if(this->getq(mb) == -1)
{
break;
}
ACE_DEBUG((LM_DEBUG, ACE_TEXT("(%t) Sending %s\n"), &(mb->rd_ptr()[4])));
stream.send_n(mb->rd_ptr(), mb->length());
mb->release();
ACE_OS::sleep(TIME_INTERVAL);
}
}
stream.close();
return 0;
}
char *Client::put_task(char *msg_t, char *msg_s, size_t msg_len)
{
for(int i = 0; i < 4; i++)
{
msg_t[i] = (msg_len >> (8 * i)) & 0xff;
}
ACE_OS::memcpy(&msg_t[4], msg_s, msg_len);
ACE_Message_Block *mb = NULL;
ACE_NEW_RETURN(mb, ACE_Message_Block(msg_len + 4, ACE_Message_Block::MB_DATA, 0, msg_t), 0);
mb->wr_ptr(msg_len + 4);
this->putq(mb);
return msg_t;
}
void Client::send_tasks(void)
{
this->activate();
ACE_Thread_Manager::instance()->wait();
}
}
全部完毕,希望大家能够喜欢:)