@Override
public void setReplicaContext(ReplicaContext replicaContext) {
this.config = replicaContext.getStaticConfiguration();
if (log == null) {
globalCheckpointPeriod = config.getGlobalCheckpointPeriod();
replicaCkpIndex = getCheckpointPortionIndex();
checkpointPortion = globalCheckpointPeriod / config.getN();
// byte[] state = getSnapshot();
if (config.isToLog()) {
int replicaId = config.getProcessId();
boolean isToLog = config.isToLog();
boolean syncLog = config.isToWriteSyncLog();
boolean syncCkp = config.isToWriteSyncCkp();
// log = new DurableStateLog(replicaId, state, computeHash(state), isToLog, syncLog,
// syncCkp);
log = new DurableStateLog(replicaId, null, null, isToLog, syncLog, syncCkp);
CSTState storedState = log.loadDurableState();
if (storedState.getLastCID() > -1) {
System.out.println("LAST CID RECOVERED FROM LOG: " + storedState.getLastCID());
setState(storedState);
getStateManager().setLastCID(storedState.getLastCID());
} else {
System.out.println("REPLICA IS IN INITIAL STATE");
}
}
getStateManager().askCurrentConsensusId();
}
}
/**
* Iterates over the commands to find if any replica took a checkpoint. When a replica take a
* checkpoint, it is necessary to save in an auxiliary table the position in the log in which that
* replica took the checkpoint. It is used during state transfer to find lower or upper log
* portions to be restored in the recovering replica. This iteration over commands is needed due
* to the batch execution strategy introduced with the durable techniques to improve state
* management. As several consensus instances can be executed in the same batch of commands, it is
* necessary to identify if the batch contains checkpoint indexes.
*
* @param msgCtxs the contexts of the consensus where the messages where executed. There is one
* msgCtx message for each command to be executed
* @return the index in which a replica is supposed to take a checkpoint. If there is no replica
* taking a checkpoint during the period comprised by this command batch, it is returned -1
*/
private int findCheckpointPosition(int[] cids) {
if (config.getGlobalCheckpointPeriod() < 1) return -1;
if (cids.length == 0) throw new IllegalArgumentException();
int firstCID = cids[0];
if ((firstCID + 1) % checkpointPortion == 0) {
return cidPosition(cids, firstCID);
} else {
int nextCkpIndex = (((firstCID / checkpointPortion) + 1) * checkpointPortion) - 1;
if (nextCkpIndex <= cids[cids.length - 1]) {
return cidPosition(cids, nextCkpIndex);
}
}
return -1;
}
