问题：
收到来自 function CheckBuyingCondition(prefix){
var Res= "";
var Current_Price_Open_ref = firebase.database().ref("dailyT/Current_Price_Open/"+nextDayTrading).orderByChild("Prefix").equalTo(prefix)
return Current_Price_Open_ref.once("value").then(function(snapshot) {
if(snapshot.exists()){
snapshot.forEach(function(childSnapshot) {
var val = childSnapshot.val();
res =""+ val.Current_Price_Open;
});
return res;
}else{
res = "NA";
}
});
}
类的消息后，会向MessageListener添加一条消息，该消息会在更改时更新GUI。问题是这种情况不一致，并且由于某些未知原因，似乎有2个列表在将消息添加到其列表时进行交换。
这是此行为的日志：
private final ObservableList<String>如果我模拟INFO: Message received:
Text: SSN= 1223 Requested amount= 11€ time= 110
ID: ID:78-192.168.0.23(84:be:e3:92:5b:b3)-1-1519325025180
Reply to: null
Feb 22, 2018 7:43:45 PM Bank.ABNAmbro addMessages
INFO: Adding message to List:SSN= 1223 Requested amount= 11€ time= 110
Feb 22, 2018 7:43:45 PM Bank.ABNAmbro addMessages
INFO: New size: 2
Feb 22, 2018 7:43:54 PM Bank.BankMessageListener onMessage
INFO: Message received:
Text: SSN= 1223 Requested amount= 11€ time= 110
ID: ID:82-192.168.0.23(84:be:e3:92:5b:b3)-1-1519325034484
Reply to: null
Feb 22, 2018 7:43:54 PM Bank.ABNAmbro addMessages
INFO: Adding message to List:SSN= 1223 Requested amount= 11€ time= 110
Feb 22, 2018 7:43:54 PM Bank.ABNAmbro addMessages
INFO: New size: 9
Feb 22, 2018 7:43:55 PM Bank.BankMessageListener onMessage
INFO: Message received:
Text: SSN= 1223 Requested amount= 11€ time= 110
ID: ID:86-192.168.0.23(84:be:e3:92:5b:b3)-1-1519325035575
Reply to: null
Feb 22, 2018 7:43:55 PM Bank.ABNAmbro addMessages
INFO: Adding message to List:SSN= 1223 Requested amount= 11€ time= 110
Feb 22, 2018 7:43:55 PM Bank.ABNAmbro addMessages
INFO: New size: 10
Feb 22, 2018 7:43:57 PM Bank.BankMessageListener onMessage
INFO: Message received:
Text: SSN= 1223 Requested amount= 11€ time= 110
ID: ID:90-192.168.0.23(84:be:e3:92:5b:b3)-1-1519325037074
Reply to: null
Feb 22, 2018 7:43:57 PM Bank.ABNAmbro addMessages
INFO: Adding message to List:SSN= 1223 Requested amount= 11€ time= 110
Feb 22, 2018 7:43:57 PM Bank.ABNAmbro addMessages
INFO: New size: 11
Feb 22, 2018 7:43:58 PM Bank.BankMessageListener onMessage
INFO: Message received:
Text: SSN= 1223 Requested amount= 11€ time= 110
ID: ID:94-192.168.0.23(84:be:e3:92:5b:b3)-1-1519325038499
Reply to: null
Feb 22, 2018 7:43:58 PM Bank.ABNAmbro addMessages
INFO: Adding message to List:SSN= 1223 Requested amount= 11€ time= 110
Feb 22, 2018 7:43:58 PM Bank.ABNAmbro addMessages
INFO: New size: 3
类只需每隔几秒添加MessageListener，则日志会显示两个大小相同的列表。
StringController类：
Feb 22, 2018 9:12:16 PM Bank.ABNAmbro addMessages
INFO: Adding message to List:Test 0
Feb 22, 2018 9:12:16 PM Bank.ABNAmbro addMessages
INFO: New sieze: 0
Feb 22, 2018 9:12:16 PM Bank.ABNAmbro addMessages
INFO: Adding message to List:Test 0
Feb 22, 2018 9:12:16 PM Bank.ABNAmbro addMessages
INFO: New sieze: 0
Feb 22, 2018 9:12:17 PM Bank.ABNAmbro addMessages
INFO: Adding message to List:Test 1
Feb 22, 2018 9:12:17 PM Bank.ABNAmbro addMessages
INFO: New sieze: 1
Feb 22, 2018 9:12:17 PM Bank.ABNAmbro addMessages
INFO: Adding message to List:Test 1
Feb 22, 2018 9:12:17 PM Bank.ABNAmbro addMessages
INFO: New sieze: 1
Feb 22, 2018 9:12:18 PM Bank.ABNAmbro addMessages
INFO: Adding message to List:Test 2
Feb 22, 2018 9:12:18 PM Bank.ABNAmbro addMessages
INFO: New sieze: 2
Feb 22, 2018 9:12:18 PM Bank.ABNAmbro addMessages
INFO: Adding message to List:Test 2
Feb 22, 2018 9:12:18 PM Bank.ABNAmbro addMessages
INFO: New sieze: 2
消息监听：
package Bank;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.ListView;
import javafx.stage.Stage;
import javax.jms.*;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
public class ABNAmbro extends Application implements Bank {
private String tile = "bank";
private List<String> messages = new ArrayList<String>();
private final ObservableList<String> olMessages = FXCollections.observableArrayList(messages);
Logger logger = Logger.getLogger("ABNAmbro");
@FXML
ListView lsRequestView;
@Override
public void start(Stage primaryStage) throws IOException {
Parent root = FXMLLoader.load(getClass().getResource("/Bank/Bank.fxml"));
Scene scene = new Scene(root);
primaryStage.setTitle(tile);
primaryStage.setScene(scene);
primaryStage.show();
}
@FXML
public void initialize() {
lsRequestView.setItems(olMessages);
}
public ABNAmbro() throws NamingException {
tile = "ABNAmbro Loan Department.";
String queuename = "ABNBankqueue";
MessageListener messageListener = new BankMessageListener(this);
InitialContext initialContext = new InitialContext();
//JMS 2.0 lookup
ConnectionFactory connectionFactory = (ConnectionFactory) initialContext.lookup("java:comp/DefaultJMSConnectionFactory");
//Creating context to reseive messages
JMSContext context = connectionFactory.createContext();
Queue queue = (Queue) initialContext.lookup(queuename);
//create consumer and add a message listener to it so it can get its message async
JMSConsumer consumer = context.createConsumer(queue);
consumer.setMessageListener(messageListener);
}
@FXML
public void SendResponse(ActionEvent event) {
}
public void addMessages(final String messages) {
logger.log(Level.INFO,"Adding message to List:" + messages);
Platform.runLater(new Runnable() {
@Override
public void run() {
//adding message to list
olMessages.add(messages);
}
});
logger.log(Level.INFO, "New sieze: " + olMessages.size());
}
}