dosubot[bot] commented on issue #2608:
URL:
https://github.com/apache/incubator-hugegraph/issues/2608#issuecomment-2261783156
<!-- Answer -->
Yes, there will be a situation where the transaction field is reused. The
code explicitly mentions that the backend transaction may be reused, and the
`setClosed` method sets the `opened` flag to `false` to allow for this reuse.
```java
private void setClosed() {
// Just set flag opened=false to reuse the backend tx
if (this.opened.get()) {
this.opened.set(false);
this.refs.decrementAndGet();
}
}
```
Additionally, the `getOrNewTransaction` method notes that it may be called
even if the transaction is not opened, specifically for the purpose of reusing
the backend transaction.
```java
private Txs getOrNewTransaction() {
/*
* NOTE: this method may be called even tx is not opened,
* the reason is for reusing backend tx.
* so we don't call this.verifyOpened() here.
*/
Txs txs = this.transactions.get();
if (txs == null) {
// ... (initialization code)
this.transactions.set(txs);
}
return txs;
}
```
In the `AbstractTransaction` class, the `reset` method is used to reset the
transaction state, which includes reinitializing the `mutation` field. This
allows the transaction to be reused.
```java
protected void reset() {
if (this.mutation == null || !this.mutation.isEmpty()) {
this.mutation = new BackendMutation();
}
}
```
The `commit` method also ensures that the transaction can be reused by
resetting the state after committing the changes.
```java
@Watched(prefix = "tx")
@Override
public void commit() throws BackendException {
LOG.debug("Transaction commit() [auto: {}]...", this.autoCommit);
this.checkOwnerThread();
if (this.closed) {
throw new BackendException("Transaction has been closed");
}
if (this.committing) {
// It is not allowed to recursively commit in a transaction
return;
}
if (!this.hasUpdate()) {
LOG.debug("Transaction has no data to commit({})", store());
return;
}
// Do commit
assert !this.committing : "Not allowed to commit when it's committing";
this.committing = true;
try {
this.commit2Backend();
} finally {
this.committing = false;
this.reset();
}
}
```
This approach ensures that transactions can be reused efficiently while
maintaining data consistency and integrity
<sup>[[1]](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/backend/tx/AbstractTransaction.java)</sup>.
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