/**
* In order to support ReentrantLock, the TransactionContext that is going to be removed when
* doing a commit may not always be at the top of a stack because an reentrant lock could issue a
* lock within a synchronized block (although it is highly not recommended). Therefore, when a
* commit is issued, we need to search back the stack from the top of the stack to find the
* appropriate TransactionContext to be removed. Most likely, the TransactionContext to be removed
* will be on the top of the stack. Therefore, the performance should be make must difference.
* Only in some weird situations where reentrantLock is mixed with synchronized block will the
* TransactionContext to be removed be found otherwise.
*/
public void commit(String lockName) throws UnlockedSharedObjectException {
logCommit0();
if (isTransactionLoggingDisabled() || objectManager.isCreationInProgress()) {
return;
}
// ClientTransaction tx = popTransaction();
ClientTransaction tx = getTransaction();
LockID lockID = lockManager.lockIDFor(lockName);
if (lockID == null || lockID.isNull()) {
lockID = tx.getLockID();
}
boolean hasCommitted = commit(lockID, tx, false);
popTransaction(lockManager.lockIDFor(lockName));
if (peekContext() != null) {
if (hasCommitted) {
createTxAndInitContext();
} else {
// If the current transaction has not committed, we will reuse the current transaction
// so that the current changes will have a chance to commit at the next commit point.
tx.setTransactionContext(peekContext());
setTransaction(tx);
}
}
}
public boolean tryBegin(String lockName, WaitInvocation timeout, int lockLevel) {
logTryBegin0(lockName, lockLevel);
if (isTransactionLoggingDisabled() || objectManager.isCreationInProgress()) {
return true;
}
final TxnType txnType = getTxnTypeFromLockLevel(lockLevel);
ClientTransaction currentTransaction = getTransactionOrNull();
if ((currentTransaction != null) && lockLevel == LockLevel.CONCURRENT) {
// make formatter sane
throw new AssertionError("Can't acquire concurrent locks in a nested lock context.");
}
final LockID lockID = lockManager.lockIDFor(lockName);
boolean isLocked = lockManager.tryLock(lockID, timeout, lockLevel);
if (!isLocked) {
return isLocked;
}
pushTxContext(lockID, txnType);
if (currentTransaction == null) {
createTxAndInitContext();
} else {
currentTransaction.setTransactionContext(this.peekContext());
}
return isLocked;
}
public boolean begin(String lockName, int lockLevel) {
logBegin0(lockName, lockLevel);
if (isTransactionLoggingDisabled() || objectManager.isCreationInProgress()) {
return false;
}
final TxnType txnType = getTxnTypeFromLockLevel(lockLevel);
ClientTransaction currentTransaction = getTransactionOrNull();
final LockID lockID = lockManager.lockIDFor(lockName);
pushTxContext(lockID, txnType);
if (currentTransaction == null) {
createTxAndInitContext();
} else {
currentTransaction.setTransactionContext(this.peekContext());
}
lockManager.lock(lockID, lockLevel);
return true;
}
private void createTxAndInitContext() {
ClientTransaction ctx = txFactory.newInstance();
ctx.setTransactionContext(peekContext());
setTransaction(ctx);
}
