2- Thread Pools

Jul 03, 2026 22:55 · 1:46 · English · Whisper Turbo · 2 Sprekers
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S… Speaker 1 (2- Thread Pools)
Threads are the fundamental building blocks of concurrent applications,
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S… Speaker 1 (2- Thread Pools)
but working directly with threads has a couple of problems.
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S… Speaker 1 (2- Thread Pools)
The first problem is that we have a limited number of threads available to us.
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S… Speaker 1 (2- Thread Pools)
So if you're not careful,
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S… Speaker 1 (2- Thread Pools)
you may end up creating too many threads and get out of memory exceptions.
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S… Speaker 1 (2- Thread Pools)
So our application will crash.
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S… Speaker 1 (2- Thread Pools)
The other issue is that creating and destroying threads is costly.
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S… Speaker 1 (2- Thread Pools)
If you have a thousand tasks to execute,
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S… Speaker 1 (2- Thread Pools)
like a thousand images to download and only 10 threads available,
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S… Speaker 1 (2- Thread Pools)
we have to download 10 images using this thread.
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S… Speaker 1 (2- Thread Pools)
Then once these threads are complete,
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S… Speaker 1 (2- Thread Pools)
you have to create another set of 10 threads and we have to repeat this
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S… Speaker 1 (2- Thread Pools)
several times to execute all our tasks.
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S… Speaker 1 (2- Thread Pools)
creating and destroying threads is expensive.
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S… Speaker 1 (2- Thread Pools)
So Java 5 came up with a solution called a thread pool.
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S… Speaker 1 (2- Thread Pools)
A thread pool is essentially a pool of threads called worker threads,
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S… Speaker 1 (2- Thread Pools)
and this thread can be reused to execute several tasks.
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S… Speaker 1 (2- Thread Pools)
When a worker thread finishes,
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S… Speaker 1 (2- Thread Pools)
it's returned back to the pool,
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S… Speaker 1 (2- Thread Pools)
so it can be reused to execute another task.
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S… Speaker 1 (2- Thread Pools)
So these threads are not destroyed and recreated.
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S… Speaker 1 (2- Thread Pools)
They're always available and are reused to execute many tasks.
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S… Speaker 1 (2- Thread Pools)
Also,
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S… Speaker 1 (2- Thread Pools)
Because the thread pool has a fixed number of threads,
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S… Speaker 1 (2- Thread Pools)
we don't have to worry about creating too many threads and running out of memory.
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S… Speaker 2 (2- Thread Pools)
For example,
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S… Speaker 1 (2- Thread Pools)
we can create a thread pool with 10 threads and submit a thousand tasks
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S… Speaker 1 (2- Thread Pools)
to it.
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S… Speaker 1 (2- Thread Pools)
The thread pool would take care of assigning our tasks to the threads.
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S… Speaker 1 (2- Thread Pools)
If all threads are busy,
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S… Speaker 1 (2- Thread Pools)
the new tasks will wait in a queue.
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S… Speaker 1 (2- Thread Pools)
As soon as a thread becomes available,
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S… Speaker 1 (2- Thread Pools)
it will pick up a task from the queue and execute it.
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S… Speaker 1 (2- Thread Pools)
So with this model,
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S… Speaker 1 (2- Thread Pools)
we don't have to think about creating threads directly.
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S… Speaker 2 (2- Thread Pools)
Instead,
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S… Speaker 1 (2- Thread Pools)
we submit our tasks to a thread pool and let the thread pool take care
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S… Speaker 1 (2- Thread Pools)
of thread manipulation.
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S… Speaker 1 (2- Thread Pools)
I'll show you how to do that next.

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