传入的数据必须反馈到轮询方法中，并且还应该进一步处理另一个类。
public List<KAAMessage> fullPoll() throws Exception {
Statement st = dbConnection.createStatement();
ResultSet rs = st.executeQuery("select * from msg_new_to_bde where ACTION = 804 order by SEQ DESC");
List<KpiMessage> pojoCol = new ArrayList<KpiMessage>();
while (rs.next()) {
KpiMessage filedClass = convertRecordsetToPojo(rs);
pojoCol.add(filedClass);
}
return pojoCol;
}
/**
* Converts a provided record-set to a {@link KpiMessage}.
*
* The following attributes are copied from record-set to pojo:
*
* <ul>
* <li>SEQ</li>
* <li>TABLENAME</li>
* <li>ENTRYTIME</li>
* <li>STATUS</li>
* </ul>
*
* @param rs
* the record-set to convert
* @return the converted pojo class object
* @throws SQLException
* if an sql error occurs during processing of recordset
*/
private KpiMessage convertRecordsetToPojo(ResultSet rs) throws SQLException {
KpiMessage msg = new KpiMessage();
int sequence = rs.getInt("SEQ");
msg.setSequence(sequence);
int action = rs.getInt("ACTION");
msg.setAction(action);
String tablename = rs.getString("TABLENAME");
msg.setTableName(tablename);
Timestamp entrytime = rs.getTimestamp("ENTRYTIME");
Date entryTime = new Date(entrytime.getTime());
msg.setEntryTime(entryTime);
Timestamp processingtime = rs.getTimestamp("PROCESSINGTIME");
if (processingtime != null) {
Date processingTime = new Date(processingtime.getTime());
msg.setProcessingTime(processingTime);
}
String keyInfo1 = rs.getString("KEYINFO1");
msg.setKeyInfo1(keyInfo1);
String keyInfo2 = rs.getString("KEYINFO2");
msg.setKeyInfo2(keyInfo2);
return msg;
}
此类具有Poll（）方法，该方法从数据库中读取消息。在数据库中，我将SequeceID作为唯一编号，并且不断增加新数据，但是如何获取这些新消息并将其反馈给轮询？
P.S：如果你投票或关闭我的帖子，请评论，因为我是新来的，我想知道细节。这是Controller类，它运行Poll（）方法的线程。
public class RunnableController {
/** Here This Queue initializes the DB and have the collection of incoming message
*
*/
private static Collection<KaMessage> incomingQueue = new ArrayList<KAMessage>();
private Connection dbConncetion;
private ExecutorService threadExecutor;
private void initializeDb()
{
//catching exception must be adapted - generic type Exception prohibited
DBhandler con = new DBhandler();
try {
dbConncetion = con.initializeDB();
} catch (Exception e) {
e.printStackTrace();
}
}
private void initialiseThreads()
{
try {
threadExecutor = Executors.newFixedThreadPool(10);
PollingSynchronizer read = new PollingSynchronizer(incomingQueue,
dbConncetion);
threadExecutor.submit(read);
}catch (Exception e){
e.printStackTrace();
}
}
private void shutDownThreads()
{
try {
threadExecutor.shutdown();
dbConncetion.close();
}catch (Exception e){
e.printStackTrace();
}
}
/** Here This Queue passes the messages and have the collection of outgoing message
*
*/
// private Collection<KpiMessage> outgingQueue = new ArrayList<KpiMessage>();
/**
* Main
*
* @param args
* @throws InterruptedException
*/
public static void main(String[] args) throws InterruptedException {
RunnableController controller = new RunnableController();
System.out.println(incomingQueue.size());
controller.initializeDb();
controller.initialiseThreads();
System.out.println("Repetetive polling for each 6 seconds");
KpiProcessor kp = new KpiProcessor();
try {
} catch (Exception e) {
e.printStackTrace();
}
}
}