[英]my code throws java.lang.IllegalMonitorStateException
[英]Java reenrantlock unlock throws java.lang.IllegalMonitorStateException
线程在执行前需要获取多个锁,所以我把所有的锁放到一个列表中,并迭代tryLock()它们,如果tryLock()成功,我将获取到的锁添加到一个名为acquiredLocks的列表中,所以当任何一个锁'tryLock () 失败,我可以解锁已经获取的锁,但是当回滚发生时,它会通过 ReenrantLock 抛出 java.lang.IllegalMonitorStateException,因为当前线程没有持有锁。 而且我检查了acquiredLocks列表,其中的一些锁确实被另一个线程获取了,但是我在将它添加到acquiredLocks列表之前调用了tryLock()。
private final List<Lock> locks = new CopyOnWriteArrayList<>();
private final List<Lock> acquiredLocks = new CopyOnWriteArrayList<>();
/**
* try to acquire all locks, if any lock is not acquired, roll back and release all already acquired
* locks
*/
private boolean tryAllLocks() {
for (Lock lock : locks) {
if (lock.tryLock()) {
acquiredLocks.add(lock);
} else {
acquiredLocks.forEach(Lock::unlock);
return false;
}
}
return true;
}
public PriceGenerationAggregate call() throws Exception {
try {
if (TenorConst.isSpotTenor(marketPriceCache.getTenor())) {
this.priceGenerationAggregate = new SpotRootPriceGenerationAggregate(marketPriceCache, synchronizeForwardSpotPrice());
} else {
this.priceGenerationAggregate = new ForwardRootPriceGenerationAggregate(marketPriceCache);
}
for (GenerationProduct generationProduct : priceGenerationAggregate.getAllSubscribedPriceForPriceGeneration().getAllGenerationProducts()) {
Lock lock = ProductLockCache.getLock(generationProduct.getCcyPair(), generationProduct.getTenor(), generationProduct.getVolume());
locks.add(lock);
}
// try all the locks before the price generation
while (!tryAllLocks()) {
Thread.sleep(100);
}
generatePrices();
} catch (Exception e) {
e.printStackTrace();
} finally {
releaseAllLocks();
}
return priceGenerationAggregate;
}
您忘记在解锁后清除已获取锁的列表。 解锁后,它们不再被获取,其他线程可以锁定它们:正如您提到的,您看到来自acquiredLocks
的锁被其他线程持有。
添加一个acquiredLocks.clear();
解锁后的声明(这仅在acquiredLocks
为每个线程都有一个新的列表实例的假设下有效)。
private boolean tryAllLocks() {
for (Lock lock : locks) {
if (lock.tryLock()) {
acquiredLocks.add(lock);
} else {
acquiredLocks.forEach(Lock::unlock);
acquiredLocks.clear(); // <-- added
return false;
}
}
return true;
}
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