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i have implemented a Runnable interface to load the image tiles and i want to call the Main thread from this secondary thread for displaying the tiles. can anybody tell me how to call a Main thread from a Runnable Interface thread in Java.
thanks.
424
This Runnable runs on the current thread, i.e. the thread that invokes this code. It doesn't magically create, or constitute, another thread. Runnable. run() is only a method call.
The main thread is created automatically when our program is started. To control it we must obtain a reference to it. This can be done by calling the method currentThread( ) which is present in Thread class.
Wait() method releases lock during Synchronization. Sleep() method does not release the lock on object during Synchronization. Wait() should be called only from Synchronized context. There is no need to call sleep() from Synchronized context.
In Summary only difference between the start() and run() method in Thread is that start creates a new thread while the run doesn't create any thread and simply executes in the current thread like a normal method call. Why wait and notify methods are declared in Object Class?
Instead of Runnable you can use Callable<Set<Image>> which returns a set of loaded images. Submit this callable task to an executor, get the Future<Set<Image>> and wait for the loading thread to finish its job.
For example:
Future<Set<Image>> future =
Executors.newSingleThreadExecutor().submit(new Callable<Set<Image>>()
{
@Override
public Set<Image> call() throws Exception
{
return someServiceThatLoadsImages.load();
}
});
try
{
Set<Image> images = future.get();
display(images);
} catch (Exception e)
{
logger.error("Something bad happened", e);
}
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