executorservice

问题 I have an event queue to process. A thread adds events to the queue. I have created a runnable Task that in the run method does all which is necessary to process the event. I have declared an Executors.newCachedThreadPool(); and I execute each Task. public class EventHandler { private static final ExecutorService handlers = Executors.newCachedThreadPool(); public void handleNextEvent(AnEvent event){ handlers.execute(new Task(evt)); } public class Task implements Runnable{ @Override public

问题 I'm writing a simple utility which accepts a collection of Callable tasks, and runs them in parallel. The hope is that the total time taken is little over the time taken by the longest task. The utility also adds some error handling logic - if any task fails, and the failure is something that can be treated as "retry-able" (e.g. a timeout, or a user-specified exception), then we run the task directly. I've implemented this utility around an ExecutorService. There are two parts: submit() all

问题 In the following code, userList gets high volume of data due to which sending email takes too long time. How can I speed up the application such that 50000 emails are sent faster? Maybe with the use of an ExecutorService ? List<String[]> userList = new ArrayList<String[]>(); void getRecords() { String [] props=null; while (rs.next()) { props = new String[2]; props[0] = rs.getString("useremail"); props[1] = rs.getString("active"); userList.add(props); if (userList.size()>0) sendEmail(); } void

问题 As per the Java Specifications: public static ScheduledExecutorService newScheduledThreadPool(int corePoolSize) "Creates a thread pool that can schedule commands to run after a given delay, or to execute periodically." But from my experience even if I create two seperate ScheduledExecutorService calling the newScheduledThreadPool(int corePoolSize) factory method twice and schedule two completely different Callable tasks, both the threads run synchonously i.e. one waits on the other.

问题 Actually here I am trying to download the multiple images from server, when I try to download images from localhost it wotks fine (within 3 sec images getting downloaded). But when I try to download it from actual server it is taking so long (atleast 15 sec) even though my internet connection is very fast. Total size of the images are not more than 600 kb. pool = Executors.newFixedThreadPool(SplitImages.length); int length = 0; for (String name : SplitImages) { pool.submit(new

问题 I have a several JScrollPane s that contains a single JTextArea each. The JTextArea s are populated with a list of variables that are constantly updated. I have a ScheduledExecutorService that constantly clears the JTextArea s and replaces the variables. For most the the JScrollPan es, the change are very seamless, and it looks like the numbers contained in the lists are changing in a smooth manner. There is one JScrollPane that is giving an issue. It will constantly give off a flash (the

问题 I am using java mail API.I am able to send emails to individual receipents as, transport.connect(); for loop { member = list.get(i) message.setRecipients(MimeMessage.RecipientType.TO, memebr+ "@abc.com"); transport.sendMessage(message, message.getRecipients(Message.RecipientType.TO)); } transport.close(); The receipents list may be 200,300,500 so on.....Now I want to implement executorservice in above case. Can anybody let me know what will be approach for implementing executor service here.

问题 I implemented the Spring-TaskExecutor (which is the equivalent of the JDK 1.5's Executor.) to process notifications notifications receiving from external systems. Interface with only one method: public interface AsynchronousService { void executeAsynchronously(Runnable task); } and the corresponding implementation: public class AsynchronousServiceImpl implements AsynchronousService { private TaskExecutor taskExecutor; @Override public void executeAsynchronously(Runnable task) { taskExecutor

问题 NOTE : I have this goal and I have many doubts, but I take the opportunity to do them all because I do not know if it would be advisable to open different posts with the same code / problem. I have a producer ( RunnableProducer ) that has multiple consumers that are called RunnableWorker . The RunnableWorker may have several consumers of its same class.. Finally, its information is consumed by simple consumers RunnableConsumer . The information can change in size, increasing or decreasing

问题 I have set of suites which run in sequential order one after an another handled by a for loop. I would want to do run the available TestSuites in parallel concurrently by just using coreJava. Could any one help me out on how to do it ? Xls_Reader suiteLauncherXls=new Xls_Reader("src/XlsFiles/SuiteLauncher.xlsx"); int RowCount=suiteLauncherXls.getRowCount(Constants.TEST_SUITE_SHEET); for(int suiteCount = 2; suiteCount <= RowCount; suiteCount++) { SUITE_ID = suiteLauncherXls.getCellData