private void updateTopologyId(TopologyAffectedCommand command) throws InterruptedException {
// set the topology id if it was not set before (ie. this is local command)
// TODO Make tx commands extend FlagAffectedCommand so we can use CACHE_MODE_LOCAL in
// TransactionTable.cleanupStaleTransactions
if (command.getTopologyId() == -1) {
CacheTopology cacheTopology = stateTransferManager.getCacheTopology();
if (cacheTopology != null) {
command.setTopologyId(cacheTopology.getTopologyId());
}
}
}
/**
* For non-tx write commands, we retry the command locally if the topology changed, instead of
* forwarding to the new owners like we do for tx commands. But we only retry on the originator,
* and only if the command doesn't have the {@code CACHE_MODE_LOCAL} flag.
*/
private Object handleNonTxWriteCommand(InvocationContext ctx, WriteCommand command)
throws Throwable {
log.tracef("handleNonTxWriteCommand for command %s", command);
if (isLocalOnly(ctx, command)) {
return invokeNextInterceptor(ctx, command);
}
updateTopologyId(command);
// Only catch OutdatedTopologyExceptions on the originator
if (!ctx.isOriginLocal()) {
return invokeNextInterceptor(ctx, command);
}
int commandTopologyId = command.getTopologyId();
Object localResult;
try {
localResult = invokeNextInterceptor(ctx, command);
return localResult;
} catch (CacheException e) {
Throwable ce = e;
while (ce instanceof RemoteException) {
ce = ce.getCause();
}
if (!(ce instanceof OutdatedTopologyException)) throw e;
log.tracef("Retrying command because of topology change: %s", command);
// We increment the topology id so that updateTopologyIdAndWaitForTransactionData waits for
// the next topology.
// Without this, we could retry the command too fast and we could get the
// OutdatedTopologyException again.
int newTopologyId =
Math.max(stateTransferManager.getCacheTopology().getTopologyId(), commandTopologyId + 1);
command.setTopologyId(newTopologyId);
stateTransferLock.waitForTransactionData(
newTopologyId, transactionDataTimeout, TimeUnit.MILLISECONDS);
localResult = handleNonTxWriteCommand(ctx, command);
}
// We retry the command every time the topology changes, either in
// NonTxConcurrentDistributionInterceptor or in
// EntryWrappingInterceptor. So we don't need to forward the command again here (without holding
// a lock).
// stateTransferManager.forwardCommandIfNeeded(command, command.getAffectedKeys(),
// ctx.getOrigin(), false);
return localResult;
}