Hi,
I am planning to create a context pool that maintains a list of
context. and I have some problem about the Context.exit();
My require is base on the following scenario:
1. I need to run about 300 thread executing script files downloaded
from the internet.
2. every thread will finish its job in less than a second, and sleep
25 seconds.
3. every thread will last 5 mins, and the main thread will start a new
thread if it found a thread is finished.
according to that design, I should have to create a Context object
each thread, but I have a new idea:
How about creating a context pool?
I create a contest array an give it to a PoolManager, and it should:
1. provide a clean(which means that it contains nothing) environment
Context object when needed, load persistent data(keeping reading and
you will find it) if the caller gives it any.
2. after a context is out of use, it should collect all properties and
function defined in it and write it to a file or some persistent
store, and give the persistent reference to the caller thread. finally
it will do a clean up.
3. use some synchronized mechanism to make sure every caller thread
will use only one context at a time, and a context should "bind" to
only one caller thread.
It the pool could work, the memory cost will reduce to less than one
tenth.
BUT, the problem is that, Context will bind to current thread,
when you create, it will bind a helper instance to it.
Object helper = VMBridge.instance.getThreadContextHelper();
VMBridge.instance.setContext(helper, cx);
and when you release it, the helper will be removed. but my pool works
in one thread, there is no other thread to bind!, how to avoiding
that?
In fact, I have though out one: put each Context in the pool to a
wrapper thread, and keep it running.
but I am no planning to use it.
can you give me some idea about that? thanks you very much :D
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