public boolean canWrite(TransactionOperation op) {
TimeStamp TS = op.transactionTimeStamp;
if (TS.compareTo(RTM) == TimeStamp.BEFORE || TS.compareTo(WTM) == TimeStamp.BEFORE) {
return false;
} else {
WTM = TS;
return true;
}
}
/**
* Note that you should call read() pretty soon after this, else you could end up with a READ when
* you shouldn't be able to.
*/
public boolean canRead(TransactionOperation op) {
TimeStamp TS = op.transactionTimeStamp;
if (TS.compareTo(WTM) == TimeStamp.BEFORE) {
return false;
} else {
setMaxRTM(TS);
return true;
}
}
/** Set RTM to be max (RTM, TS). */
public void setMaxRTM(TimeStamp TS) {
if (RTM == null) {
RTM = TS;
} else if (TS.compareTo(RTM) == TimeStamp.AFTER) {
RTM = TS;
}
}