Hi,
I am replacing the multithreaded code in my app with the AsyncTask from 1.5.
I found that two AsyncTasks do not work concurrently. I investigated a bit
and found a workaround; I would like second opinion if my solution is right.
OR if there is a better solution.
AsyncTask allows the app to do a task on a thread other than the UI thread.
But IIUC, it only provides a single thread on which a queue of tasks is
performed. Therefore, if one of the task is to wait on some event (n/w or
sleep) then all other tasks will wait for it to finish.
To elaborate with the coding example:
<code>
public class MyTask extends AsyncTask<...>
{ ... }
// On the UI thread execute two tasks
MyTask mt1 = new MyTask().execute(args);
MyTask mt2 = new MyTask().execute(args);
</code>
In the above code both the execute calls will return immediately and free up
the UI thread; however mt1 will be executed first and mt2 will have to wait
until mt1 finishes.
Thanks to the android's open source, we can see implementation of AsyncTask.
http://google.com/codesearch/p?hl=en&sa=N&cd=2&ct=rc#uX1GffpyOZk/core/java/android/os/AsyncTask.java&q=lang:java%20AsyncTask
I copied AsyncTask.java as UserTask.java in my project and changed the value
of CORE_POOL_SIZE to 5. This makes the thread pool to use 5 threads to
multiplex the queued AsyncTasks. This indeed solved my problem. Now if mt1
blocks on a sleep; mt2 goes ahead and finishes its job.
Here are some questions for those who know more about AsyncTask
implementation:
Is this work-around right?
If yes, can the CORE_POOL_SIZE be made configurable in future, via an API
call?
Is there a solution by which multiple thread pools can be used?
Let me add that, I am aware that this is a phone and not a web server - I am
not using 10s of threads to do network I/O. However a single thread is not
sufficient for my app either.
Please let me know. Thanks in advance.
Jayesh
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