private boolean validateTransactionConflictsAndMarkState(
Operation request, ServiceDocument currentState) {
if (currentState == null) {
return false;
}
String requestTransactionId = request.getTransactionId();
String currentStateTransactionId = currentState.documentTransactionId;
if (request.getAction() == Action.GET) {
if (requestTransactionId == null) {
// non-transactional read
if (currentStateTransactionId == null) {
return false;
} else {
logTransactionConflict(request, currentState);
return true;
}
} else {
// transactional read
if (currentStateTransactionId == null) {
logTransactionUpdate(buildLogTransactionUpdateMsg(request, currentState));
currentState.documentTransactionId = requestTransactionId;
return false;
} else {
if (requestTransactionId.equals(currentStateTransactionId)) {
return false;
} else {
logTransactionConflict(request, currentState);
return true;
}
}
}
} else {
if (requestTransactionId == null) {
// non-transactional write
if (currentStateTransactionId == null
|| request.hasPragmaDirective(PRAGMA_DIRECTIVE_DELETE_ON_TRANSACTION_END)) {
return false;
} else {
logTransactionConflict(request, currentState);
return true;
}
} else {
// transactional write
if (currentStateTransactionId == null) {
logTransactionUpdate(buildLogTransactionUpdateMsg(request, currentState));
currentState.documentTransactionId = requestTransactionId;
return false;
} else {
if (requestTransactionId.equals(currentStateTransactionId)) {
return false;
} else {
logTransactionConflict(request, currentState);
return true;
}
}
}
}
}
private void handleClearTransaction(
Operation request,
ServiceDocument currentState,
ClearTransactionRequest clearTransactionRequest) {
if (currentState == null) {
request.complete();
return;
}
if (!request.getTransactionId().equals(currentState.documentTransactionId)) {
if (clearTransactionRequest.transactionOutcome == TransactionOutcome.COMMIT) {
String warning =
String.format(
"Request to clear transaction %s from service %s but current transaction is: %s",
request.getTransactionId(),
this.service.getSelfLink(),
currentState.documentTransactionId);
this.service.getHost().log(Level.WARNING, warning);
}
request.complete();
return;
}
if (clearTransactionRequest.transactionOutcome == TransactionOutcome.ABORT
&& clearTransactionRequest.isUpdated) {
// restore previous state
URI previousStateQueryUri =
UriUtils.buildDocumentQueryUri(
this.service.getHost(),
this.service.getSelfLink(),
false,
false,
ServiceOption.PERSISTENCE);
previousStateQueryUri =
UriUtils.appendQueryParam(
previousStateQueryUri,
ServiceDocument.FIELD_NAME_VERSION,
Long.toString(clearTransactionRequest.originalVersion));
Operation previousStateGet =
Operation.createGet(previousStateQueryUri)
.setCompletion(
(o, e) -> {
if (e != null) {
request.fail(e);
return;
}
ServiceDocument previousState = o.getBody(currentState.getClass());
this.service
.getHost()
.log(
Level.INFO,
"Aborting transaction %s on service %s, current version %d, restoring version %d",
request.getTransactionId(),
this.service.getSelfLink(),
currentState.documentVersion,
clearTransactionRequest.originalVersion);
previousState.documentTransactionId = null;
this.service.setState(request, previousState);
request.complete();
});
this.service.sendRequest(previousStateGet);
return;
}
currentState.documentTransactionId = null;
request.complete();
}