2- Thread Pools

Jul 03, 2026 22:55 · 1:46 · English · Whisper Turbo · 2 スピーカー

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講義索引

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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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