20- Solution- Random Delays

Jul 04, 2026 01:29 · 4:27 · English · Whisper Turbo · 2 স্পিকার

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পাঠের সূচী

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S… Speaker 2 (20- Solution- Random Delays)

Now let's make this more interesting.

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I'm going to add a random delay to each website.

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I want each website to respond at a different time.

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With this,

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you can see that we're displaying these codes as we get them.

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S… Speaker 1 (20- Solution- Random Delays)

So,

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let's go to our long task class.

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I want to overwrite the simulate method,

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and in the second version,

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I want to introduce a parameter called delay.

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So instead of three seconds,

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we're going to use this argument.

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Now we go to our flight service class.

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We're going to reuse our random object to

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pass a random delay to the simulate method.

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So let's say we want each website to respond between 1 to 3

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seconds.

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We have a baseline of 1 second plus random

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that next int 2 seconds.

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Now let's run a program and see what happens.

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So we're querying this concurrently and

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We're getting responses in different times.

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Beautiful.

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Now the last part.

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We want to print a final message to say how long it took to query all these

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websites.

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That is pretty easy.

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So we go to our demo class.

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After we get the quotes,

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we collect them in a list.

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Let's store the result over here.

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This is going to give us a list of future objects.

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Let me show you.

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S… Speaker 1 (20- Solution- Random Delays)

So,

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list of completable future of void.

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Now we can use the all of method to wait for the completion of all these

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future objects.

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So,

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completable future dot all of,

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here we have a var arcs parameter,

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technically this is a syntactic sugar over arrays,

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so we can pass an array of completable future objects.

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That is pretty easy,

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we call futures dot to array,

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now this method is overloaded

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The version without parameters returns an object array.

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Let me show you.

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I'm going to put this on a new line.

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Take a look.

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So the version without a parameter returns an object

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array. We don't want this because the all of method expects an array

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of completable future objects.

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So we should use the second version and here we should pass an

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array of completable futures.

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With this,

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we'll get a completable future array.

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So over here we pass new completable future

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of 0.

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So we pass an empty array and with this we're telling

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this method that we want the result to be a completable future array.

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Okay?

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Now we wait for all the result.

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Let me put this on a new line.

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Pay attention to how I'm formatting this code.

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So we have completable future,

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we wait for all these futures to complete,

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then we're going to run

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this piece of code.

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This is where we're going to print our final message.

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First we need to calculate how long it took to execute this operation.

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So,

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just before we start,

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we're going to get the current time.

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We can use the local time class.

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This class has a static method called now.

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So this returns the current time.

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Now,

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over here,

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we're going to repeat this.

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So,

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we calculate the end time,

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local time dot now.

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Then we create a duration object.

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So this duration class has a static method called between.

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We can pass the start and end time and get

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a duration object.

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And finally we print a message like retrieve all

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quotes in here we call duration dot

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two millis.

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This will return the duration in milliseconds.

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And finally we add msec.

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Okay?

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Let's run the program and see the result.

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There

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you go.

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Beautiful.

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S… Speaker 2 (20- Solution- Random Delays)

So that brings us to the end of this course.

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S… Speaker 2 (20- Solution- Random Delays)

I want to say thank you for allowing me to be your instructor.

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If you enjoyed this course,

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please support me by telling others about my coding school.

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I really appreciate your support.

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S… Speaker 2 (20- Solution- Random Delays)

Once again,

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thank you and I hope to see you again in my other courses.

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S… Speaker 2 (20- Solution- Random Delays)

Thank you and have a fantastic day.

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