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Add JobSchedulingWithDeadline algorithm (#5608)
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@ -475,6 +475,7 @@
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* scheduling
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* [FCFSScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/FCFSScheduling.java)
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* [HighestResponseRatioNextScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/HighestResponseRatioNextScheduling.java)
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* [JobSchedulingWithDeadline](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/JobSchedulingWithDeadline.java)
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* [MLFQScheduler](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/MLFQScheduler.java)
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* [PreemptivePriorityScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/PreemptivePriorityScheduling.java)
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* [RRScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/RRScheduling.java)
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@ -963,6 +964,7 @@
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* scheduling
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* [FCFSSchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/FCFSSchedulingTest.java)
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* [HighestResponseRatioNextSchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/HighestResponseRatioNextSchedulingTest.java)
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* [JobSchedulingWithDeadlineTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/JobSchedulingWithDeadlineTest.java)
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* [MLFQSchedulerTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/MLFQSchedulerTest.java)
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* [PreemptivePrioritySchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/PreemptivePrioritySchedulingTest.java)
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* [RRSchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/RRSchedulingTest.java)
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@ -0,0 +1,88 @@
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package com.thealgorithms.scheduling;
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import java.util.Arrays;
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import java.util.Comparator;
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/**
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* A class that implements a job scheduling algorithm to maximize profit
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* while adhering to job deadlines and arrival times.
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*
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* This class provides functionality to schedule jobs based on their profit,
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* arrival time, and deadlines to ensure that the maximum number of jobs is completed
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* within the given timeframe. It sorts the jobs in decreasing order of profit
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* and attempts to assign them to the latest possible time slots.
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*/
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public final class JobSchedulingWithDeadline {
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private JobSchedulingWithDeadline() {
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}
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/**
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* Represents a job with an ID, arrival time, deadline, and profit.
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*
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* Each job has a unique identifier, an arrival time (when it becomes available for scheduling),
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* a deadline by which it must be completed, and a profit associated with completing the job.
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*/
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static class Job {
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int jobId;
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int arrivalTime;
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int deadline;
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int profit;
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/**
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* Constructs a Job instance with the specified job ID, arrival time, deadline, and profit.
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*
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* @param jobId Unique identifier for the job
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* @param arrivalTime Time when the job becomes available for scheduling
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* @param deadline Deadline for completing the job
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* @param profit Profit earned upon completing the job
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*/
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Job(int jobId, int arrivalTime, int deadline, int profit) {
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this.jobId = jobId;
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this.arrivalTime = arrivalTime;
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this.deadline = deadline;
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this.profit = profit;
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}
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}
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/**
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* Schedules jobs to maximize profit while respecting their deadlines and arrival times.
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*
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* This method sorts the jobs in descending order of profit and attempts
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* to allocate them to time slots that are before or on their deadlines,
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* provided they have arrived. The function returns an array where the first element
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* is the total number of jobs scheduled and the second element is the total profit earned.
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*
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* @param jobs An array of Job objects, each representing a job with an ID, arrival time,
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* deadline, and profit.
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* @return An array of two integers: the first element is the count of jobs
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* that were successfully scheduled, and the second element is the
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* total profit earned from those jobs.
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*/
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public static int[] jobSequencingWithDeadlines(Job[] jobs) {
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Arrays.sort(jobs, Comparator.comparingInt(job -> - job.profit));
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int maxDeadline = Arrays.stream(jobs).mapToInt(job -> job.deadline).max().orElse(0);
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int[] timeSlots = new int[maxDeadline];
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Arrays.fill(timeSlots, -1);
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int count = 0;
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int maxProfit = 0;
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// Schedule the jobs
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for (Job job : jobs) {
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if (job.arrivalTime <= job.deadline) {
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for (int i = Math.min(job.deadline - 1, maxDeadline - 1); i >= job.arrivalTime - 1; i--) {
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if (timeSlots[i] == -1) {
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timeSlots[i] = job.jobId;
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count++;
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maxProfit += job.profit;
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break;
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}
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}
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}
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}
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return new int[] {count, maxProfit};
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}
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}
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@ -0,0 +1,43 @@
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package com.thealgorithms.scheduling;
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import static org.junit.jupiter.api.Assertions.assertArrayEquals;
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import org.junit.jupiter.api.Test;
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class JobSchedulingWithDeadlineTest {
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@Test
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void testJobSequencingWithDeadlines1() {
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JobSchedulingWithDeadline.Job[] jobs = {new JobSchedulingWithDeadline.Job(1, 1, 4, 20), new JobSchedulingWithDeadline.Job(2, 1, 1, 10), new JobSchedulingWithDeadline.Job(3, 1, 1, 40), new JobSchedulingWithDeadline.Job(4, 1, 1, 30)};
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int[] result = JobSchedulingWithDeadline.jobSequencingWithDeadlines(jobs);
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assertArrayEquals(new int[] {2, 60}, result); // Expected output: 2 jobs, 60 profit
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}
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@Test
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void testJobSequencingWithDeadlines2() {
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JobSchedulingWithDeadline.Job[] jobs = {new JobSchedulingWithDeadline.Job(1, 1, 2, 100), new JobSchedulingWithDeadline.Job(2, 1, 1, 19), new JobSchedulingWithDeadline.Job(3, 1, 2, 27), new JobSchedulingWithDeadline.Job(4, 1, 1, 25), new JobSchedulingWithDeadline.Job(5, 1, 1, 15)};
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int[] result = JobSchedulingWithDeadline.jobSequencingWithDeadlines(jobs);
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assertArrayEquals(new int[] {2, 127}, result); // Expected output: 2 jobs, 127 profit
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}
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@Test
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void testJobSequencingWithDeadlinesWithArrivalTimes() {
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JobSchedulingWithDeadline.Job[] jobs = {new JobSchedulingWithDeadline.Job(1, 2, 5, 50), new JobSchedulingWithDeadline.Job(2, 3, 4, 60), new JobSchedulingWithDeadline.Job(3, 1, 3, 20)};
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int[] result = JobSchedulingWithDeadline.jobSequencingWithDeadlines(jobs);
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assertArrayEquals(new int[] {3, 130}, result); // All 3 jobs fit within their deadlines
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}
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@Test
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void testJobSequencingWithDeadlinesNoJobs() {
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JobSchedulingWithDeadline.Job[] jobs = {};
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int[] result = JobSchedulingWithDeadline.jobSequencingWithDeadlines(jobs);
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assertArrayEquals(new int[] {0, 0}, result); // No jobs, 0 profit
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}
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@Test
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void testJobSequencingWithDeadlinesSingleJob() {
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JobSchedulingWithDeadline.Job[] jobs = {new JobSchedulingWithDeadline.Job(1, 1, 1, 50)};
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int[] result = JobSchedulingWithDeadline.jobSequencingWithDeadlines(jobs);
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assertArrayEquals(new int[] {1, 50}, result); // 1 job scheduled, 50 profit
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}
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}
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