public TaskWorker(
String owner,
String author,
TaskDescriptor descriptor,
ITaskPerformer performer,
ApplicationEventPublisher eventPublisher) {
// initialize variables
this.descriptor = descriptor;
this.performer = performer;
this.eventPublisher = eventPublisher;
// locks
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
this.writeLock = lock.writeLock();
this.readLock = lock.readLock();
this.executionLock = new CountDownLatch(1);
// fill variables
this.result = injectId(new TaskResult(), descriptor.getId());
this.result.setDescriptorId(descriptor.getId());
this.result.setOwner(owner);
this.result.setAuthor(author);
this.result.setParameters(descriptor.getParameters());
this.result.setRegistrationDate(new Date());
this.result.setStatus(TaskResultStatus.UNKNOWN);
// change state
changeState(new TaskProgress(TaskProgress.PENDING_STEP), TaskExecutionStatus.RUNNING);
}
@Override
public TaskResult get(long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException, TimeoutException {
if (!executionLock.await(timeout, unit)) {
throw new TimeoutException(
String.format(
"Task '%s[%s]' hasn't completed", performer.retrieveName(), descriptor.getId()));
}
return result;
}
/**
* Публикует событие изменения прогресса выполнения задачи
*
* @param targetProgress обновленный прогресс выполнения
*/
private void changeState(TaskProgress targetProgress) {
writeLock.lock();
try {
progress = targetProgress;
doPublishEvent(
new TaskProgressEvent(this, descriptor.getId(), performer.retrieveName(), targetProgress),
true);
} finally {
writeLock.unlock();
}
}
/**
* Публикует событие изменения статуса выполнения задачи
*
* @param targetState обновленный статус выполнения
*/
private void changeState(TaskExecutionStatus targetState) {
writeLock.lock();
try {
status = targetState;
doPublishEvent(
new TaskExecutionEvent(this, descriptor.getId(), performer.retrieveName(), targetState),
false);
} finally {
writeLock.unlock();
}
}
@Override
public void run() {
// Устанавливаем системные параметры запуска
startTask();
// Выполняем задачу
Map<String, Object> results = null;
TaskResultStatus resultStatus;
Throwable cause = null;
try {
results = performer.performTask(this, result.getParameters());
resultStatus = (isCancelled()) ? TaskResultStatus.CANCELED : TaskResultStatus.FINISHED;
} catch (Throwable th) {
resultStatus = TaskResultStatus.ERROR;
cause = th;
LOG.error(
String.format(
"Task '%s[%s]' error: %s",
descriptor.getId(), performer.retrieveName(), cause.getMessage()),
cause);
}
// Устанавливаем системные параметры завершения
endTask(results, resultStatus, cause);
}