From 4ba96ab66cca743519b0f327ed82cc595ddc25df Mon Sep 17 00:00:00 2001 From: Hardik Pawar Date: Wed, 9 Oct 2024 11:02:03 +0530 Subject: [PATCH 1/7] Add `LotteryScheduling` new algorithm with Junit tests --- pom.xml | 7 + .../scheduling/LotteryScheduling.java | 134 ++++++++++++++++++ .../scheduling/LotterySchedulingTest.java | 65 +++++++++ 3 files changed, 206 insertions(+) create mode 100644 src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java create mode 100644 src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java diff --git a/pom.xml b/pom.xml index 673be6cd4e36..812f46c700ea 100644 --- a/pom.xml +++ b/pom.xml @@ -40,6 +40,13 @@ ${assertj.version} test + + org.mockito + mockito-core + 5.14.1 + test + + org.junit.jupiter diff --git a/src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java b/src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java new file mode 100644 index 000000000000..9ba4ef21de83 --- /dev/null +++ b/src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java @@ -0,0 +1,134 @@ +package com.thealgorithms.scheduling; + +import java.util.ArrayList; +import java.util.List; +import java.util.Random; + +/** + * The LotteryScheduling class implements the Lottery Scheduling algorithm, which is + * a probabilistic CPU scheduling algorithm. Processes are assigned tickets, and + * the CPU is allocated to a randomly selected process based on ticket count. + * Processes with more tickets have a higher chance of being selected. + */ +public final class LotteryScheduling { + private LotteryScheduling() { + } + + private List processes; + private Random random; + + /** + * Constructs a LotteryScheduling object with the provided list of processes. + * + * @param processes List of processes to be scheduled using Lottery Scheduling. + */ + public LotteryScheduling(final List processes) { + this.processes = processes; + this.random = new Random(); + } + + /** + * Constructs a LotteryScheduling object with the provided list of processes and a Random object. + * + * @param processes List of processes to be scheduled using Lottery Scheduling. + * @param random Random object used for generating random numbers. + */ + public LotteryScheduling(final List processes, Random random) { + this.processes = processes; + this.random = random; + } + + /** + * Schedules the processes using the Lottery Scheduling algorithm. + * Each process is assigned a certain number of tickets, and the algorithm randomly + * selects a process to execute based on ticket count. The method calculates the + * waiting time and turnaround time for each process and simulates their execution. + */ + public List scheduleProcesses() { + int totalTickets = processes.stream().mapToInt(Process::getTickets).sum(); + int currentTime = 0; + List executedProcesses = new ArrayList<>(); + + while (!processes.isEmpty()) { + int winningTicket = random.nextInt(totalTickets) + 1; + Process selectedProcess = selectProcessByTicket(winningTicket); + + selectedProcess.setWaitingTime(currentTime); + currentTime += selectedProcess.getBurstTime(); + selectedProcess.setTurnAroundTime(selectedProcess.getWaitingTime() + selectedProcess.getBurstTime()); + + executedProcesses.add(selectedProcess); + processes.remove(selectedProcess); + + totalTickets = processes.stream().mapToInt(Process::getTickets).sum(); + } + + return executedProcesses; + } + + /** + * Selects a process based on a winning ticket. The method iterates over the + * list of processes, and as the ticket sum accumulates, it checks if the + * current process holds the winning ticket. + * + * @param winningTicket The randomly generated ticket number that determines the selected process. + * @return The process associated with the winning ticket. + */ + private Process selectProcessByTicket(int winningTicket) { + int ticketSum = 0; + for (Process process : processes) { + ticketSum += process.getTickets(); + if (ticketSum >= winningTicket) { + return process; + } + } + return null; + } + + /** + * The Process class represents a process in the scheduling system. Each process has + * an ID, burst time (CPU time required for execution), number of tickets (used in + * lottery selection), waiting time, and turnaround time. + */ + public static class Process { + private String processId; + private int burstTime; + private int tickets; + private int waitingTime; + private int turnAroundTime; + + public Process(String processId, int burstTime, int tickets) { + this.processId = processId; + this.burstTime = burstTime; + this.tickets = tickets; + } + + public String getProcessId() { + return processId; + } + + public int getBurstTime() { + return burstTime; + } + + public int getTickets() { + return tickets; + } + + public int getWaitingTime() { + return waitingTime; + } + + public void setWaitingTime(int waitingTime) { + this.waitingTime = waitingTime; + } + + public int getTurnAroundTime() { + return turnAroundTime; + } + + public void setTurnAroundTime(int turnAroundTime) { + this.turnAroundTime = turnAroundTime; + } + } +} diff --git a/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java b/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java new file mode 100644 index 000000000000..4ea840b759af --- /dev/null +++ b/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java @@ -0,0 +1,65 @@ +package com.thealgorithms.scheduling; + +import static org.junit.jupiter.api.Assertions.assertEquals; +import static org.mockito.Mockito.mock; +import static org.mockito.Mockito.when; + +import java.util.ArrayList; +import java.util.List; +import java.util.Random; +import org.junit.jupiter.api.BeforeEach; +import org.junit.jupiter.api.Test; + +public class LotterySchedulingTest { + + private Random mockRandom; + + @BeforeEach + public void setup() { + mockRandom = mock(Random.class); + } + + @Test + public void testLotterySchedulingWithMockedRandom() { + List processes = createProcesses(); + LotteryScheduling lotteryScheduling = new LotteryScheduling(processes, mockRandom); + + // Mock the sequence of random numbers (winning tickets) + // This sequence ensures that P1 (10 tickets), P3 (8 tickets), and P2 (5 tickets) are selected. + when(mockRandom.nextInt(23)).thenReturn(5, 18, 11); // winning tickets for P1, P3, and P2 + + List executedProcesses = lotteryScheduling.scheduleProcesses(); + + // Assert correct number of processes + assertEquals(3, executedProcesses.size()); + + // Assert the process execution order and properties + LotteryScheduling.Process process1 = executedProcesses.get(0); + assertEquals("P1", process1.getProcessId()); + assertEquals(0, process1.getWaitingTime()); + assertEquals(10, process1.getTurnAroundTime()); + + LotteryScheduling.Process process2 = executedProcesses.get(1); + assertEquals("P2", process2.getProcessId()); + assertEquals(10, process2.getWaitingTime()); + assertEquals(15, process2.getTurnAroundTime()); + + LotteryScheduling.Process process3 = executedProcesses.get(2); + assertEquals("P3", process3.getProcessId()); + assertEquals(15, process3.getWaitingTime()); + assertEquals(23, process3.getTurnAroundTime()); + } + + private List createProcesses() { + LotteryScheduling.Process process1 = new LotteryScheduling.Process("P1", 10, 10); // 10 tickets + LotteryScheduling.Process process2 = new LotteryScheduling.Process("P2", 5, 5); // 5 tickets + LotteryScheduling.Process process3 = new LotteryScheduling.Process("P3", 8, 8); // 8 tickets + + List processes = new ArrayList<>(); + processes.add(process1); + processes.add(process2); + processes.add(process3); + + return processes; + } +} From 6ea57952a2dd204e8166988a3163478fc333b31f Mon Sep 17 00:00:00 2001 From: Hardvan Date: Wed, 9 Oct 2024 05:32:26 +0000 Subject: [PATCH 2/7] Update directory --- DIRECTORY.md | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/DIRECTORY.md b/DIRECTORY.md index 6042dd1b5e0d..97674ca49dac 100644 --- a/DIRECTORY.md +++ b/DIRECTORY.md @@ -31,6 +31,7 @@ * [IsPowerTwo](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/IsPowerTwo.java) * [LowestSetBit](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/LowestSetBit.java) * [NonRepeatingNumberFinder](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/NonRepeatingNumberFinder.java) + * [NumberAppearingOddTimes](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/NumberAppearingOddTimes.java) * [NumbersDifferentSigns](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/NumbersDifferentSigns.java) * [ReverseBits](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/ReverseBits.java) * [SingleBitOperations](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/SingleBitOperations.java) @@ -473,6 +474,7 @@ * scheduling * [FCFSScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/FCFSScheduling.java) * [HighestResponseRatioNextScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/HighestResponseRatioNextScheduling.java) + * [LotteryScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java) * [MLFQScheduler](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/MLFQScheduler.java) * [PreemptivePriorityScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/PreemptivePriorityScheduling.java) * [RRScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/RRScheduling.java) @@ -638,6 +640,7 @@ * [IsPowerTwoTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/IsPowerTwoTest.java) * [LowestSetBitTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/LowestSetBitTest.java) * [NonRepeatingNumberFinderTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/NonRepeatingNumberFinderTest.java) + * [NumberAppearingOddTimesTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/NumberAppearingOddTimesTest.java) * [NumbersDifferentSignsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/NumbersDifferentSignsTest.java) * [ReverseBitsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/ReverseBitsTest.java) * [SingleBitOperationsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/SingleBitOperationsTest.java) @@ -958,6 +961,7 @@ * scheduling * [FCFSSchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/FCFSSchedulingTest.java) * [HighestResponseRatioNextSchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/HighestResponseRatioNextSchedulingTest.java) + * [LotterySchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java) * [MLFQSchedulerTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/MLFQSchedulerTest.java) * [PreemptivePrioritySchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/PreemptivePrioritySchedulingTest.java) * [RRSchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/RRSchedulingTest.java) From 832e6c9d3c1c323c3a82de3c5b5f77a3d30a487b Mon Sep 17 00:00:00 2001 From: Hardik Pawar Date: Wed, 9 Oct 2024 11:14:01 +0530 Subject: [PATCH 3/7] Fix --- .../com/thealgorithms/scheduling/LotterySchedulingTest.java | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java b/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java index 4ea840b759af..aecb251cac9a 100644 --- a/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java +++ b/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java @@ -52,8 +52,8 @@ public void testLotterySchedulingWithMockedRandom() { private List createProcesses() { LotteryScheduling.Process process1 = new LotteryScheduling.Process("P1", 10, 10); // 10 tickets - LotteryScheduling.Process process2 = new LotteryScheduling.Process("P2", 5, 5); // 5 tickets - LotteryScheduling.Process process3 = new LotteryScheduling.Process("P3", 8, 8); // 8 tickets + LotteryScheduling.Process process2 = new LotteryScheduling.Process("P2", 5, 5); // 5 tickets + LotteryScheduling.Process process3 = new LotteryScheduling.Process("P3", 8, 8); // 8 tickets List processes = new ArrayList<>(); processes.add(process1); From 0ee93cc1101f391ac81ed99adf6fc50feb1d0516 Mon Sep 17 00:00:00 2001 From: Hardik Pawar Date: Wed, 9 Oct 2024 11:18:58 +0530 Subject: [PATCH 4/7] Fix --- .../java/com/thealgorithms/scheduling/LotterySchedulingTest.java | 1 - 1 file changed, 1 deletion(-) diff --git a/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java b/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java index aecb251cac9a..00fd8adcde27 100644 --- a/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java +++ b/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java @@ -30,7 +30,6 @@ public void testLotterySchedulingWithMockedRandom() { List executedProcesses = lotteryScheduling.scheduleProcesses(); - // Assert correct number of processes assertEquals(3, executedProcesses.size()); // Assert the process execution order and properties From fd4f31b3a716d6e3b8cd46a48fedc6268b4295cc Mon Sep 17 00:00:00 2001 From: siriak Date: Thu, 10 Oct 2024 17:17:12 +0000 Subject: [PATCH 5/7] Update directory --- DIRECTORY.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/DIRECTORY.md b/DIRECTORY.md index 35f44f4e8aee..1d37f58f5de4 100644 --- a/DIRECTORY.md +++ b/DIRECTORY.md @@ -481,8 +481,8 @@ * [EDFScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/EDFScheduling.java) * [FCFSScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/FCFSScheduling.java) * [HighestResponseRatioNextScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/HighestResponseRatioNextScheduling.java) - * [LotteryScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java) * [JobSchedulingWithDeadline](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/JobSchedulingWithDeadline.java) + * [LotteryScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java) * [MLFQScheduler](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/MLFQScheduler.java) * [PreemptivePriorityScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/PreemptivePriorityScheduling.java) * [RRScheduling](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/scheduling/RRScheduling.java) @@ -985,8 +985,8 @@ * [EDFSchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/EDFSchedulingTest.java) * [FCFSSchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/FCFSSchedulingTest.java) * [HighestResponseRatioNextSchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/HighestResponseRatioNextSchedulingTest.java) - * [LotterySchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java) * [JobSchedulingWithDeadlineTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/JobSchedulingWithDeadlineTest.java) + * [LotterySchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/LotterySchedulingTest.java) * [MLFQSchedulerTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/MLFQSchedulerTest.java) * [PreemptivePrioritySchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/PreemptivePrioritySchedulingTest.java) * [RRSchedulingTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/scheduling/RRSchedulingTest.java) From 2845722898fdb75e281ccb13018d118375488003 Mon Sep 17 00:00:00 2001 From: siriak Date: Sat, 12 Oct 2024 07:37:24 +0000 Subject: [PATCH 6/7] Update directory --- DIRECTORY.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/DIRECTORY.md b/DIRECTORY.md index 2e6ab98c2164..e679339a94f4 100644 --- a/DIRECTORY.md +++ b/DIRECTORY.md @@ -54,6 +54,7 @@ * [CompositeLFSR](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/ciphers/a5/CompositeLFSR.java) * [LFSR](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/ciphers/a5/LFSR.java) * [Utils](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/ciphers/a5/Utils.java) + * [ADFGVXCipher](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/ciphers/ADFGVXCipher.java) * [AES](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/ciphers/AES.java) * [AESEncryption](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/ciphers/AESEncryption.java) * [AffineCipher](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/ciphers/AffineCipher.java) @@ -683,6 +684,7 @@ * [A5CipherTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/a5/A5CipherTest.java) * [A5KeyStreamGeneratorTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/a5/A5KeyStreamGeneratorTest.java) * [LFSRTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/a5/LFSRTest.java) + * [ADFGVXCipherTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/ADFGVXCipherTest.java) * [AESEncryptionTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/AESEncryptionTest.java) * [AffineCipherTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/AffineCipherTest.java) * [AtbashTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/AtbashTest.java) From 920ce38670d94b4eae60c5b709647457fd36b32f Mon Sep 17 00:00:00 2001 From: Hardik Pawar Date: Sun, 13 Oct 2024 08:17:02 +0530 Subject: [PATCH 7/7] Fix --- .../com/thealgorithms/scheduling/LotteryScheduling.java | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java b/src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java index 9ba4ef21de83..cea0c793d340 100644 --- a/src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java +++ b/src/main/java/com/thealgorithms/scheduling/LotteryScheduling.java @@ -53,6 +53,13 @@ public List scheduleProcesses() { int winningTicket = random.nextInt(totalTickets) + 1; Process selectedProcess = selectProcessByTicket(winningTicket); + if (selectedProcess == null) { + // This should not happen in normal circumstances, but we'll handle it just in case + System.err.println("Error: No process selected. Recalculating total tickets."); + totalTickets = processes.stream().mapToInt(Process::getTickets).sum(); + continue; + } + selectedProcess.setWaitingTime(currentTime); currentTime += selectedProcess.getBurstTime(); selectedProcess.setTurnAroundTime(selectedProcess.getWaitingTime() + selectedProcess.getBurstTime());