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Master-level Java assignments often involve advanced topics such as concurrency, design patterns, and complex data structures. These problems require not only a deep understanding of Java but also the ability to apply theoretical concepts in practical scenarios. Students frequently seek "Java assignment help Australia" to navigate these complexities and enhance their programming skills.
Question:
Design and implement a concurrent task manager in Java that can handle multiple tasks simultaneously. The manager should allow for tasks to be added, removed, and executed in parallel. Implement appropriate synchronization mechanisms to ensure thread safety and avoid race conditions.
Solution:
To tackle this problem, we need to create a TaskManager
class that utilizes Java's concurrency utilities to manage and execute tasks concurrently. Here's a step-by-step breakdown of the solution:
Define the Task Interface:
public interface Task {
void execute();
}
This interface will be implemented by various tasks that we want to manage.
Implement the TaskManager Class:
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;
public class TaskManager {
private final ExecutorService executorService;
private final BlockingQueue<Task> taskQueue;
public TaskManager(int numberOfThreads) {
this.executorService = Executors.newFixedThreadPool(numberOfThreads);
this.taskQueue = new LinkedBlockingQueue<>();
startTaskExecution();
}
private void startTaskExecution() {
Runnable taskRunner = () -> {
while (true) {
try {
Task task = taskQueue.take();
executorService.submit(task::execute);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
break;
}
}
};
new Thread(taskRunner).start();
}
public void addTask(Task task) {
taskQueue.offer(task);
}
public void removeTask(Task task) {
taskQueue.remove(task);
}
public void shutdown() {
executorService.shutdown();
}
}
Explanation:
This implementation ensures that tasks are managed and executed in parallel while maintaining thread safety through the use of blocking queues and a thread pool.
Question:
Create a custom concurrent collection class that behaves similarly to Java's ConcurrentHashMap
. The collection should support concurrent read and write operations and ensure thread safety.
Solution:
To design a custom concurrent collection, we will build a simplified version of ConcurrentHashMap
using Java's concurrency utilities. Here's a solution outline:
Define the ConcurrentCollection Class:
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.HashMap;
import java.util.Map;
public class ConcurrentCollection<K, V> {
private final Map<K, V> map;
private final ReentrantReadWriteLock lock;
public ConcurrentCollection() {
this.map = new HashMap<>();
this.lock = new ReentrantReadWriteLock();
}
public V get(K key) {
lock.readLock().lock();
try {
return map.get(key);
} finally {
lock.readLock().unlock();
}
}
public void put(K key, V value) {
lock.writeLock().lock();
try {
map.put(key, value);
} finally {
lock.writeLock().unlock();
}
}
public void remove(K key) {
lock.writeLock().lock();
try {
map.remove(key);
} finally {
lock.writeLock().unlock();
}
}
}
Explanation:
This custom collection class provides basic concurrent read and write operations with thread safety, similar to the behavior of ConcurrentHashMap
.
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