聊天室是一種典型的網絡應用，這個程序演示了ICE框架的基本結構。
1）定義SLICE接口。
module Chat {
interface MessageReceiver {
void onMessage(string sender, string msg);
};
dictionary<string, MessageReceiver*> UserList;
interface Room {
bool login(string user, MessageReceiver* receiver);
void logout(string user);
void sendMessage(string user, string message);
};
};
定義兩個接口，Room用于服務器端實現，MessageReceiver用于客戶端實現。
使用slice2cpp生成C++文件: chat.h, chat.cpp.
2）服務器端實現。
#include <iostream>
#include <Ice/Ice.h>
#include "chat.h"
using std::string;
class ChatRoomI : public Chat::Room {
public:
virtual bool login(const string&, const Chat::MessageReceiverPrx&, const Ice::Current&);
virtual void logout(const string&, const Ice::Current&);
virtual void sendMessage(const string&, const string&, const Ice::Current&);
private:
void broadcast(const string& user, const string& message);
bool notify(const Chat::MessageReceiverPrx& receiver, const string& sender, const string& message);
Chat::UserList users_;
};
bool ChatRoomI::login(const string& user, const Chat::MessageReceiverPrx& receiver, const Ice::Current&) {
if (users_.find(user) != users_.end()) {
return false;
}
users_.insert(Chat::UserList::value_type(user, receiver));
broadcast(user, "---login---");
return true;
}
void ChatRoomI::logout(const string& user, const Ice::Current&) {
users_.erase(user);
broadcast(user, "===logout===");
}
void ChatRoomI::sendMessage(const string& user, const string& message, const Ice::Current&) {
broadcast(user, message);
}
void ChatRoomI::broadcast(const string& user, const string& message) {
Chat::UserList::iterator it = users_.begin(), end = users_.end();
while (it != end) {
if (user != it->first && !notify(it->second, it->first, message))
users_.erase(it++);
else
++it;
}
}
bool ChatRoomI::notify(const Chat::MessageReceiverPrx& receiver, const string& sender, const string& message) {
bool ret = true;
try {
receiver->onMessage(sender, message);
} catch(const std::exception& ex) {
ret = false;
}
return ret;
}
class Server : public Ice::Application {
public:
virtual int run(int argc, char* argv[]) {
Ice::ObjectAdapterPtr adapter = communicator()->createObjectAdapterWithEndpoints(
"Chat.RoomAdapter", "default -p 10000");
Chat::RoomPtr room = new ChatRoomI;
adapter->add(room, communicator()->stringToIdentity("Chat.Room"));
adapter->activate();
communicator()->waitForShutdown();
return 0;
}
};
int main(int argc, char* argv[]) {
Server app;
return app.main(argc, argv);
}
3）客戶端實現。
#include <iostream>
#include <Ice/Ice.h>
#include "chat.h"
using std::string;
class ChatUserI : public Chat::MessageReceiver {
public:
virtual void onMessage(const string& user, const string& message, const Ice::Current&) {
std::cout << user << " : " << message << std::endl;
}
};
class Client : public Ice::Application {
public:
virtual int run(int argc, char* argv[]) {
Chat::RoomPrx chatRoom = Chat::RoomPrx::checkedCast(
communicator()->stringToProxy("Chat.Room:default -p 10000"));
if (!chatRoom) {
std::cout << "Proxy not existed!\n";
return -1;
}
Ice::ObjectAdapterPtr adapter = communicator()->createObjectAdapterWithEndpoints(
"Chat.UserAdapter", "default");
Chat::MessageReceiverPtr user = new ChatUserI;
adapter->add(user, communicator()->stringToIdentity("Chat.User"));
adapter->activate();
Chat::MessageReceiverPrx userPrx = Chat::MessageReceiverPrx::uncheckedCast(
adapter->createProxy(communicator()->stringToIdentity("Chat.User")));
string name;
std::cout << "Please input user name: ";
std::cin >> name;
if (!chatRoom->login(name, userPrx)) {
std::cout << "login error: User Name already exist!\n";
return 0;
}
std::cout << "login OK!" << std::endl;
string message;
while (std::getline(std::cin, message) && message != "quit") {
chatRoom->sendMessage(name, message);
}
chatRoom->logout(name);
return 0;
}
};
int main(int argc, char* argv[]) {
Client app;
return app.main(argc, argv);
}