使用Java轮询Web服务
我已经实现了一个使用Java的聊天服务和桌面客户端，该程序运行良好，但客户端消耗大量的CPU，这个想法是：
唯一的问题是，轮询线程消耗大量的CPU，我不知道使用异步Web服务是否会有所帮助。
例如 ：
这是将事件添加到队列中的类
public class Session {
private String owner;
private int sessionID;
private BlockingQueue<Events> eventsQueue = new LinkedBlockingQueue<Events>();
public Session() {
}
public Session(String owner, int sessionID) {
this.owner = owner;
this.sessionID = sessionID;
}
public Events getEvent() {
try {
return eventsQueue.take();
} catch (InterruptedException ex) {
System.err.println("Error retreiving Events");
}
return null;
}
public void addEvent(Events ev) {
try {
eventsQueue.put(ev);
eventsQueue.put(ev);
System.out.println("New Event Created with ID : " + ev.getId());
System.out.println("Number Of Evenets in Queue " + getOwner() + " : " + eventsQueue.size());
} catch (InterruptedException ex) {
System.err.println("Error Creating New Event");
}
}
public int queueSize() {
return eventsQueue.size();
}
public String getOwner() {
return owner;
}
public void setOwner(String owner) {
this.owner = owner;
}
public int getSessionID() {
return sessionID;
}
public void setSessionID(int sessionID) {
this.sessionID = sessionID;
}
}
这是轮询线程
public class pollingThread implements Runnable {
public void run() {
while (true) {
if (checkQueue(Login.getUserName()) != null) {
final Events ev = (Events) ObjectSerialization.Deserialize(checkQueue(Login.getUserName()));
if (ev != null) {
switch (ev.getId()) {
case 1:
System.out.println("Event Retreived : " + ev.getEventType());
RefreshOnlineList RfEv = (RefreshOnlineList) ev;
if (RfEv.getLogEvent().equals("1") && !RfEv.getUname().equals(Login.getUserName())) {
Chatter.showTrayMessage(RfEv.getUname() + " Has Just logged In", MessageType.INFO);
} else if (!RfEv.getUname().equals(Login.getUserName())) {
Chatter.showTrayMessage(RfEv.getUname() + " Has Just logged Out", MessageType.INFO);
}
Chatter.updateUsersCounter();
Chatter.updateList();
break;
case 2:
System.out.println("Event Retreived : " + ev.getEventType());
final RegistrationEvent RegEv = (RegistrationEvent) ev;
Chatter.showTrayMessage(RegEv.getUser().getUser_name() + " Has Just Registered", MessageType.INFO);
SwingUtilities.invokeLater(new Runnable() {
public void run() {
Chatter.addNewUserPanel(RegEv.getUser());
}
});
break;
case 3:
System.out.println("Event Retreived : " + ev.getEventType());
final ChatRequestEvent ChEv = (ChatRequestEvent) ev;
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
int res = JOptionPane.showConfirmDialog(
null,
ChEv.getRequestingUser() + " Wishes to connect with you !! ",
"Incoming Request",
JOptionPane.YES_NO_OPTION);
if (res == 1) {
replyRequest(ChEv.getRequestingUser(), ChEv.getReceivingUser(), false, ChEv.getRequestID());
} else {
chatWindow s = new chatWindow(ChEv.getRequestID(), ChEv.getRequestingUser() + " - " + ChEv.getReceivingUser());
Chatter.addChatwindow(ChEv.getRequestID(), s);
Chatter.setUserIsChatting(ChEv.getRequestingUser(), true);
chatWindow.main(ChEv.getRequestID(), ChEv.getRequestingUser() + " - " + ChEv.getReceivingUser() + " Are Talking ...", s);
replyRequest(ChEv.getRequestingUser(), ChEv.getReceivingUser(), true, ChEv.getRequestID());
startChatSession(Login.getUserName(), ChEv.getRequestingUser(), ChEv.getRequestID(), Chatter.getDate());
}
}
});
break;
case 4:
System.out.println("Event Retreived : " + ev.getEventType());
final RequestResponseEvent ResponseEv = (RequestResponseEvent) ev;
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
if (ResponseEv.isResponse()) {
chatWindow s = new chatWindow(ResponseEv.getChatRequestID(), ResponseEv.getRequestinguser() + " - " + ResponseEv.getReceivingUser());
Chatter.addChatwindow(ResponseEv.getChatRequestID(), s);
Chatter.setUserIsChatting(ResponseEv.getReceivingUser(), true);
chatWindow.main(ResponseEv.getChatRequestID(), ResponseEv.getRequestinguser() + " - " + ResponseEv.getReceivingUser() + " Are Talking ...", s);
} else {
JOptionPane.showMessageDialog(null, ResponseEv.getReceivingUser() + " Ignored Your Request");
}
}
});
break;
case 5:
System.out.println("Event Retreived : " + ev.getEventType());
//Add Code to beautify the message not only the body
final SendMessageEvent MessageEv = (SendMessageEvent) ev;
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
Chatter.addMessage(MessageEv.getMessage(), MessageEv.getChatID());
}
});
break;
case 6:
System.out.println("Event Retreived : " + ev.getEventType());
final LeaveChatEvent LeaveEv = (LeaveChatEvent) ev;
SwingUtilities.invokeLater(new Runnable() {
public void run() {
System.out.println(LeaveEv.getUserName() + " has left the Chat with ID: " + LeaveEv.getChatID());
Chatter.addMessage(new shared.Message(LeaveEv.getUserName(), 1), LeaveEv.getChatID());
Chatter.setUserIsChatting(LeaveEv.getUserName(), false);
}
});
break;
case 7:
System.out.println("Event Retreived : " + ev.getEventType());
final GroupChatRequestEvent GroupChatEvent = (GroupChatRequestEvent) ev;
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
int res = JOptionPane.showConfirmDialog(
null,
GroupChatEvent.getRequestingUser() + " Wants to Join his Group Conference !! ",
"Incoming Request",
JOptionPane.YES_NO_OPTION);
if (res != 1) {
chatWindow s = new chatWindow(GroupChatEvent.getChatID(), "Conference - " + GroupChatEvent.getRequestingUser() + " - " + Login.getUserName());
Chatter.addChatwindow(GroupChatEvent.getChatID(), s);
Chatter.setUserIsChatting(GroupChatEvent.getRequestingUser(), true);
chatWindow.main(GroupChatEvent.getChatID(), "Conference - " + GroupChatEvent.getRequestingUser() + " - " + Login.getUserName() + " Are Talking ...", s);
joinChat(Login.getUserName(), GroupChatEvent.getChatID());
}
}
});
break;
case 8:
System.out.println("Event Retreived : " + ev.getEventType());
final LeaveChatEvent joinEv = (LeaveChatEvent) ev;
SwingUtilities.invokeLater(new Runnable() {
public void run() {
System.out.println(joinEv.getUserName() + " has Joined the Chat with ID: " + joinEv.getChatID());
Chatter.addMessage(new shared.Message(joinEv.getUserName(), 2), joinEv.getChatID());
Chatter.setUserIsChatting(joinEv.getUserName(), true);
}
});
break;
case 9:
System.out.println("Event Retreived : " + ev.getEventType());
final UpdateStatusEvent updateEv = (UpdateStatusEvent) ev;
SwingUtilities.invokeLater(new Runnable() {
public void run() {
System.out.println(updateEv.getUser() + " has updated his status to " + updateEv.getStatus());
Chatter.updateStatusList(updateEv.getUser(), updateEv.getStatus());
}
});
break;
case 10:
System.out.println("Event Retreived : " + ev.getEventType());
final RefreshDetailsEvent refEvenet = (RefreshDetailsEvent) ev;
SwingUtilities.invokeLater(new Runnable() {
public void run() {
System.out.println(refEvenet.getUser() + " has updated his Details ");
Chatter.updateDetails(refEvenet.getUser());
}
});
break;
case 11:
System.out.println("Event Retreived : " + ev.getEventType());
final BlockedEvent BlockedEv = (BlockedEvent) ev;
SwingUtilities.invokeLater(new Runnable() {
public void run() {
System.out.println(BlockedEv.getUserName() + " has Been Blocked ");
JOptionPane.showMessageDialog(null, "You have Been BlockednReason: " + BlockedEv.getReason());
Chatter.signOut();
}
});
break;
}
}
}
}
}
private static byte[] checkQueue(java.lang.String uname) {
db.Database service = new db.Database();
db.DatabasePortType port = service.getDatabaseHttpSoap12Endpoint();
return port.checkQueue(uname);
}
private static void replyRequest(java.lang.String requestingUser, java.lang.String receivingUser, java.lang.Boolean result, java.lang.Integer id) {
db.Database service = new db.Database();
db.DatabasePortType port = service.getDatabaseHttpSoap12Endpoint();
port.replyRequest(requestingUser, receivingUser, result, id);
}
private static void startChatSession(java.lang.String initiatingUser, java.lang.String receivingUser, java.lang.Integer id, java.lang.String sessionTime) {
db.Database service = new db.Database();
db.DatabasePortType port = service.getDatabaseHttpSoap12Endpoint();
port.startChatSession(initiatingUser, receivingUser, id, sessionTime);
}
private static void joinChat(java.lang.String uname, java.lang.Integer chatID) {
db.Database service = new db.Database();
db.DatabasePortType port = service.getDatabaseHttpSoap12Endpoint();
port.joinChat(uname, chatID);
}
}
队列检查
感谢帮助
而不是让客户端轮询主服务器，我会说使用推技术，以便服务器将更改推送到适当的客户端（如果有的话）。 但是，这可能需要根据您当前的体系结构进行很多更改。
更新：
其基本思想是：如果有客户端轮询服务器以获取更新（而不是客户端），则更改客户端代码，以便他们等待从服务器接收更新（客户端中等待接收服务器更新的另一个线程）。 服务器将拥有包含客户端信息的事件列表，以便将正确的数据发送给正确的客户端。
所以在客户端，您至少需要2个线程才能将更新发送到服务器，另一个线程会等待从服务器接收更新（由服务器推送）。
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