用ACE实现简易Echo Server

本文主要是介绍用ACE实现简易Echo Server，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

一、编写代码
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1.	/*  
2.	 * ace_echo_server.cpp  
3.	 *  
4.	 */  
5.	  
6.	#include <iostream>   
7.	#include <string>   
8.	#include <cctype>   
9.	  
10.	#include <ace/INET_Addr.h>   
11.	#include <ace/SOCK_Stream.h>   
12.	#include <ace/SOCK_Acceptor.h>   
13.	#include <ace/Log_Msg.h>   
14.	#include <ace/Reactor.h>   
15.	#include <ace/Auto_Ptr.h>   
16.	  
17.	using namespace std;   
18.	  
19.	class EchoService: public ACE_Event_Handler {   
20.	public:   
21.	    ACE_SOCK_Stream& peer() {   
22.	        return sock_;   
23.	    }   
24.	  
25.	    int open() {   
26.	        char peerName[MAXHOSTNAMELEN];   
27.	        ACE_INET_Addr peerAddr;   
28.	        if (sock_.get_remote_addr(peerAddr) == 0 && peerAddr.addr_to_string(   
29.	                peerName, MAXHOSTNAMELEN) == 0)   
30.	            cout << "connection from " << peerName << endl;   
31.	  
32.	        return this->reactor()->register_handler(this,   
33.	                ACE_Event_Handler::READ_MASK);   
34.	    }   
35.	  
36.	    virtual ACE_HANDLE get_handle() const {   
37.	        return sock_.get_handle();   
38.	    }   
39.	  
40.	    virtual int handle_input(ACE_HANDLE fd) {   
41.	        const int INPUT_SIZE = 4096;   
42.	        char buffer[INPUT_SIZE];   
43.	  
44.	        ssize_t recv_cnt, send_cnt;   
45.	        if ((recv_cnt = sock_.recv(buffer, sizeof(buffer))) <= 0) {   
46.	            cout << "connection closed\n";   
47.	            return -1;   
48.	        }   
49.	  
50.	        send_cnt = sock_.send(buffer, recv_cnt);   
51.	        if (send_cnt == recv_cnt)   
52.	            return 0;   
53.	  
54.	        if (send_cnt == -1 && ACE_OS::last_error() != EWOULDBLOCK) {   
55.	            cout << "send error\n";   
56.	            return -1;   
57.	        }   
58.	  
59.	        return 0;   
60.	    }   
61.	  
62.	    virtual int handle_close(ACE_HANDLE handle, ACE_Reactor_Mask mask) {   
63.	        if (mask == ACE_Event_Handler::WRITE_MASK)   
64.	            return 0;   
65.	        mask = ACE_Event_Handler::ALL_EVENTS_MASK   
66.	                | ACE_Event_Handler::DONT_CALL;   
67.	        reactor()->remove_handler(this, mask);   
68.	        sock_.close();   
69.	        delete this;   
70.	        return 0;   
71.	    }   
72.	  
73.	private:   
74.	    ACE_SOCK_Stream sock_;   
75.	  
76.	};   
77.	  
78.	class EchoAcceptor: public ACE_Event_Handler {   
79.	public:   
80.	    int open(const ACE_INET_Addr& listenAddr) {   
81.	        if (acceptor_.open(listenAddr, 1) == -1) {   
82.	            cerr << "acceptor.open error\n";   
83.	            return -1;   
84.	        }   
85.	  
86.	        return reactor()->register_handler(this, ACE_Event_Handler::ACCEPT_MASK);   
87.	    }   
88.	  
89.	    virtual ACE_HANDLE get_handle() const {   
90.	        return acceptor_.get_handle();   
91.	    }   
92.	  
93.	    virtual int handle_input(ACE_HANDLE fd = ACE_INVALID_HANDLE) {   
94.	        EchoService* client = new EchoService;   
95.	        auto_ptr<EchoService> p(client);   
96.	  
97.	        if (acceptor_.accept(client->peer()) == -1) {   
98.	            cerr << "Failed to accept client connection\n";   
99.	            return -1;   
100.	        }   
101.	        p.release();   
102.	  
103.	        client->reactor(this->reactor());   
104.	        if (client->open() == -1)   
105.	            client->handle_close(ACE_INVALID_HANDLE, 0);   
106.	        return 0;   
107.	    }   
108.	  
109.	    virtual int handle_close(ACE_HANDLE handle, ACE_Reactor_Mask closeMask) {   
110.	        if (acceptor_.get_handle() != ACE_INVALID_HANDLE) {   
111.	            ACE_Reactor_Mask m = ACE_Event_Handler::ACCEPT_MASK   
112.	                    | ACE_Event_Handler::DONT_CALL;   
113.	            reactor()->remove_handler(this, m);   
114.	            acceptor_.close();   
115.	        }   
116.	  
117.	        return 0;   
118.	    }   
119.	  
120.	    virtual ~EchoAcceptor() {   
121.	        handle_close(ACE_INVALID_HANDLE, 0);   
122.	    }   
123.	  
124.	private:   
125.	    ACE_SOCK_Acceptor acceptor_;   
126.	};   
127.	  
128.	int main() {   
129.	    ACE_INET_Addr port_to_listen("8868");   
130.	    EchoAcceptor acceptor;   
131.	    acceptor.reactor(ACE_Reactor::instance());   
132.	  
133.	    if (acceptor.open(port_to_listen) == -1)   
134.	        return 1;   
135.	  
136.	    ACE_Reactor::instance()->run_alertable_event_loop();   
137.	  
138.	    return 0;   
139.	}

二、编译代码

$ g++-o"ace_echo_server" -g3 -Wall ace_echo_server.cpp -lACE

三、运行程序 ace_echo_server

$ ./ace_echo_server

四、用 telnet 命令作为客户端测试

新开启一个终端，注意：同样要登录到Linux实验室，执行： telnet localhost 8868

$ telnet localhost 8868

Trying ::1...

Trying 127.0.0.1...

Connected to localhost.

Escape character is '^]'.

the firstline # 这是我们的输入