Question

我正在尝试编写一个简单的消息管理器，但我的队列中没有显示任何消息。

调用它的代码是：

//initialize message manager
    CJournal.Journal(Main.class, "Initializing message manager");
    MessageManager messageManager = new MessageManager();
    messageManager.run();

    //send bootstrap message
    CJournal.Journal(Main.class, "Testing messanger: ending bootstrapping message to messagemanager");
    Message boot_strap_message = new Message();
    boot_strap_message.mflag = EEventMachine.EM_BOOTSTRAP;
    messageManager.EnqueueMessage(boot_strap_message);

消息管理器代码是：

public  class MessageManager implements Runnable {

    PriorityQueue<Message> messagesQueue = new PriorityQueue<Message>();


    public void EnqueueMessage(Message message)
    {
        messagesQueue.add(message);
    }

    @Override
    public  void run() {
        // TODO Auto-generated method stub
        while (true)
        {
            //pull message from queue


            if (!messagesQueue.isEmpty())
            {
                CJournal.Journal(MessageManager.class, "Found a message");
                Message message = messagesQueue.remove();

                //dispatch messages according to their type
                switch(message.mflag)
                {
                case EM_BOOTSTRAP:
                    CJournal.Journal(MessageManager.class, "Messaging system working properly.");
                default:
                    CJournal.Journal(MessageManager.class, "Dispatch Message Trashed");
                }
            }
        }
    }

调试输出为：

13 In Class::class Sampler.Main Journal Entry:Testing Event Manager
14 In Class::class Sampler.Main Journal Entry:Created dummy CEvent. Pushing to event manager.
15 In Class::class Sampler.Main Journal Entry:Initializing message manager

我应该得到，＆＃34;消息系统正常工作＆＃34;

有什么想法吗？

--------------------------------------------------------------
O`11 In Class::class SchedulingManager.Timer.CTimerManager Journal Entry:Creating a CTimer Object
12 In Class::class SchedulingManager.Timer.CTimerManager Journal Entry:Timer creation success. Adding CTimer object to internal list Of Timers
13 In Class::class Sampler.Main Journal Entry:Testing Event Manager
14 In Class::class Sampler.Main Journal Entry:Created dummy CEvent. Pushing to event manager.
15 In Class::class Sampler.Main Journal Entry:Initializing message manager
16 In Class::class Sampler.Main Journal Entry:Testing messanger: ending bootstrapping message to messagemanager
Exception in thread "main" Exception in thread "Thread-4" java.lang.ClassCastException: MessageManagement.Message cannot be cast to java.lang.Comparable
    at java.util.concurrent.PriorityBlockingQueue.siftUpComparable(Unknown Source)
    at java.util.concurrent.PriorityBlockingQueue.offer(Unknown Source)
    at java.util.concurrent.PriorityBlockingQueue.add(Unknown Source)
    at MessageManagement.MessageManager.EnqueueMessage(MessageManager.java:69)
    at Sampler.Main.main(Main.java:128)
java.util.NoSuchElementException
    at java.util.AbstractQueue.remove(Unknown Source)
    at MessageManagement.MessageManager.run(MessageManager.java:47)

这段代码：

`public class MessageManager extends Thread {

    @Override
    public  void run() {
        // TODO Auto-generated method stub
        while (true)
        {

            if (!messagesQueue.isEmpty())
            {
                //pull message from queue
                Message message = messagesQueue.remove();

                //dispatch messages according to their type
                switch(message.mflag)
                {
                case EM_BOOTSTRAP:
                    CJournal.Journal(MessageManager.class, "Messaging system working properly.");
                default:
                    CJournal.Journal(MessageManager.class, "Dispatch Message Trashed");
                }
            }
        }
    }



    public static PriorityBlockingQueue<Message> messagesQueue = new PriorityBlockingQueue<Message>();

    public static void EnqueueMessage(Message message)
    {
        messagesQueue.add(message);
    }

这就是我宣布我的主题的方式：

    MessageManager messageManager = new MessageManager();
    messageManager.start();


    //send bootstrap message
    CJournal.Journal(Main.class, "Testing messanger: ending bootstrapping message to messagemanager");
    Message boot_strap_message = new Message();
    boot_strap_message.mflag = EEventMachine.EM_BOOTSTRAP;
    messageManager.EnqueueMessage(boot_strap_message);

    Loop loop = new Loop();  //hand over to game loop

我不确定问题是什么。

Answer 1

您正在同一run()内MessageManager呼叫Thread，然后进入无限循环。

您需要将MessageManager包装在新的Thread中并启动该帖子。

new Thread(messageManager).start();

但是，如果您要从多个线程访问它，则可能需要更改PriorityQueue

来自JavaDoc：

请注意，此实现未同步。如果任何线程修改队列，则多个线程不应同时访问PriorityQueue实例。而是使用线程安全的PriorityBlockingQueue类。

消息管理器已损坏

1 个答案: