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Copy pathWorker.java
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107 lines (90 loc) · 3.57 KB
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package com.example.worker;
import com.example.metrics.MetricsCollector;
import com.example.model.Task;
import com.example.model.TaskStatus;
import com.example.queue.DeadLetterQueue;
import com.example.queue.PersistentTaskQueue;
import com.example.retry.RetryStrategy;
import java.time.Duration;
import java.util.Map;
public class Worker implements Runnable {
private final String workerId;
private final PersistentTaskQueue taskQueue;
private final DeadLetterQueue dlq;
private final Map<String, TaskHandler> handlers;
private final RetryStrategy retryStrategy;
private final MetricsCollector metrics = MetricsCollector.getInstance();
private volatile boolean running = true;
public Worker(String workerId, PersistentTaskQueue taskQueue, DeadLetterQueue dlq,
Map<String, TaskHandler> handlers, RetryStrategy retryStrategy) {
this.workerId = workerId;
this.taskQueue = taskQueue;
this.dlq = dlq;
this.handlers = handlers;
this.retryStrategy = retryStrategy;
}
@Override
public void run() {
System.out.println("[" + workerId + "] Worker started");
while (running) {
try {
Task task = taskQueue.poll();
processTask(task);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
break;
}
}
System.out.println("[" + workerId + "] Worker stopped");
}
private void processTask(Task task) {
long startTime = System.currentTimeMillis();
System.out.println("[" + workerId + "] Processing: " + task);
task.setStatus(TaskStatus.PROCESSING);
taskQueue.updateTask(task);
TaskHandler handler = handlers.get(task.getType());
if (handler == null) {
task.setStatus(TaskStatus.FAILED);
task.setErrorMessage("No handler for type: " + task.getType());
taskQueue.updateTask(task);
dlq.add(task);
metrics.recordFailure();
return;
}
try {
handler.handle(task);
long duration = System.currentTimeMillis() - startTime;
task.setStatus(TaskStatus.COMPLETED);
taskQueue.removeTask(task.getId());
metrics.recordSuccess(duration);
System.out.println("[" + workerId + "] Completed: " + task + " (" + duration + "ms)");
} catch (Exception e) {
handleFailure(task, e);
}
}
private void handleFailure(Task task, Exception e) {
task.incrementRetry();
task.setErrorMessage(e.getMessage());
if (retryStrategy.shouldRetry(task.getRetryCount(), task.getMaxRetries())) {
Duration delay = retryStrategy.getDelay(task.getRetryCount());
System.out.println("[" + workerId + "] Task failed, retry in " +
delay.toMillis() + "ms... " + task);
try {
Thread.sleep(delay.toMillis());
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
}
task.setStatus(TaskStatus.PENDING);
taskQueue.submit(task);
} else {
System.err.println("[" + workerId + "] Task failed permanently: " + task);
task.setStatus(TaskStatus.FAILED);
taskQueue.updateTask(task);
dlq.add(task);
metrics.recordFailure();
}
}
public void stop() {
running = false;
}
}