scheduledexecutorservice

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 My android application retrieves some json data from remote API for each Marker (a Marker shows the position of a real device, there are less than 10 devices to watch) present on the map, and sets status of a device by changing a color of the marker according to some rule working on a given json data. I use AsyncTask to fetch json data and change a status of a device. I keep fetched data in ConcurrentHashMap<Device, Data> . So, I run a number of asynctasks, one for each device. I also use a

问题 I have a ScheduledExecutorService that I am using to run a method updateIndex() every one minute. However, if changes to resources are made during the one minute between the last refresh and the next refresh, I would like to have updateIndex() called immediately, and then have the executor service resume it's normal schedule; i.e. next update will take place in one minute. However, I haven't seen anything in the documentation to suggest there is the capability to do this. Any ideas? 回答1:

问题 Hi I was reading on internet that we can schedule any thing which we want to run at a gap of certain interval using alarm manager and ScheduledExecutorService . I want to know what is the difference between them and what to use when Thanks in advance. 回答1: ScheduledExecutorService is something inside your process. If your process is already around for other reasons, such as it is supplying the foreground UI, and you want to use ScheduledExecutorService for periodic work, that's fine. However,

问题 Here is the situation, the code is below User fills 3 fields and press the "Add" button => a ToDoBean is created and added to a ToDoModel (extends AbstractTableModel) and a Runnable is created with the index of the ToDoBean in the model. The Runnable is started immediatly through a ScheduledExecutorService. The goal of the Runnable is to decrement an int until it reaches zero. Everything works fine. Now the user can also select a row in the JTable and press the "Remove" button to remove the

问题 So this is my first time using ScheduledFuture and I admit I'm probably way over my head here. I cannot seem to get the below sample to work. Goal is simply to take two sets of actions each with it's own timeout before moving on to the next set and repeating indefinitely. static ScheduledExecutorService executor = Executors.newScheduledThreadPool(2); ScheduledFuture<?> warm = executor.scheduleWithFixedDelay(() -> { System.out.println("warmbeans"); //do more stuff here }, 0, 1000, TimeUnit

问题 I am using SchedulerExecuterService to execute a task after specified delay and at given intervals. ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1); scheduler.scheduleAtFixedRate(taskThread,60 ,120 ,TimeUnit.SECONDS); What happening is first time taskThread is not starting after delay of 60 sec, it is started after delay of more than 60 secs. Whereas the next executions started at correct intervals of 120 secs(not exactly 120 secs but there is a very minute delay

问题 private ScheduledExecutorService pool = new ScheduledThreadPoolExecutor(20); I'm running a task public void run() { if (queue.isEmpty()) return; ArrayDeque<Profile> current = new ArrayDeque<Profile>(); this.queue.drainTo(current, 20); MySQLStatement statement = this.wrapper.prepare(); while (!current.isEmpty()) { if (statement.isClosed()) return; Profile profile = current.poll(); statement.addBatch(profile.getId().toString(), ProfileBuilder.toJson(profile)); } statement.executeBatchAsync(); }

问题 I want to start ScheduledExecutorService exactly 12 AM daily ,Schedule has to Start at today at 22/02/2017 00:00:00 (UTC TIME),Can any one tell me Whether my code is Correct or not? DateTime today = new DateTime().withTimeAtStartOfDay(); DateTime startOfTommorrow = today.plusDays(1).withTimeAtStartOfDay(); Long midnight = startOfTommorrow.getMillis(); long midnights = (midnight / 1000) / 60; final DateFormat nextDateTymFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); System.out.println("

问题 Hi there i've written a simple program to test the precision of the ScduledExecutorService.schedule() function. The test sets a delay and check the effective distance between the required delay and the effective result. The test have been performed on a i7 machine running Linux 3.8 x86_64, with both OpenJDK 1.7 and Oracle JDK 1.7 The result of the test is really bad, here there is a list to show you the average delta between presumed and effective delay: Legend: Sleep(ms) : the delay required