/*
- * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
+ * Copyright (c) 2016, 2017 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
import java.util.Queue;
import javax.annotation.Nullable;
import javax.annotation.concurrent.NotThreadSafe;
+import org.opendaylight.controller.cluster.access.commands.IncrementTransactionSequenceRequest;
+import org.opendaylight.controller.cluster.access.commands.IncrementTransactionSequenceSuccess;
import org.opendaylight.controller.cluster.access.commands.OutOfOrderRequestException;
import org.opendaylight.controller.cluster.access.commands.TransactionRequest;
import org.opendaylight.controller.cluster.access.commands.TransactionSuccess;
import org.opendaylight.controller.cluster.access.concepts.RuntimeRequestException;
import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
import org.opendaylight.yangtools.concepts.Identifiable;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
/**
* Frontend common transaction state as observed by the shard leader.
*/
@NotThreadSafe
abstract class FrontendTransaction implements Identifiable<TransactionIdentifier> {
+ private static final Logger LOG = LoggerFactory.getLogger(FrontendTransaction.class);
+
private final AbstractFrontendHistory history;
private final TransactionIdentifier id;
private Long lastPurgedSequence;
private long expectedSequence;
+ private RequestException previousFailure;
+
FrontendTransaction(final AbstractFrontendHistory history, final TransactionIdentifier id) {
this.history = Preconditions.checkNotNull(history);
this.id = Preconditions.checkNotNull(id);
return history;
}
+ final String persistenceId() {
+ return history().persistenceId();
+ }
+
final java.util.Optional<TransactionSuccess<?>> replaySequence(final long sequence) throws RequestException {
// Fast path check: if the requested sequence is the next request, bail early
if (expectedSequence == sequence) {
lastPurgedSequence = sequence;
}
- // Sequence has already been checked
- abstract @Nullable TransactionSuccess<?> handleRequest(TransactionRequest<?> request,
- RequestEnvelope envelope, long now) throws RequestException;
+ // Request order has already been checked by caller and replaySequence()
+ @SuppressWarnings("checkstyle:IllegalCatch")
+ @Nullable
+ final TransactionSuccess<?> handleRequest(final TransactionRequest<?> request, final RequestEnvelope envelope,
+ final long now) throws RequestException {
+ if (request instanceof IncrementTransactionSequenceRequest) {
+ final IncrementTransactionSequenceRequest incr = (IncrementTransactionSequenceRequest) request;
+ expectedSequence += incr.getIncrement();
+
+ return recordSuccess(incr.getSequence(),
+ new IncrementTransactionSequenceSuccess(incr.getTarget(), incr.getSequence()));
+ }
+
+ if (previousFailure != null) {
+ LOG.debug("{}: Rejecting request {} due to previous failure", persistenceId(), request, previousFailure);
+ throw previousFailure;
+ }
+
+ try {
+ return doHandleRequest(request, envelope, now);
+ } catch (RuntimeException e) {
+ /*
+ * The request failed to process, we should not attempt to ever
+ * apply it again. Furthermore we cannot accept any further requests
+ * from this connection, simply because the transaction state is
+ * undefined.
+ */
+ LOG.debug("{}: Request {} failed to process", persistenceId(), request, e);
+ previousFailure = new RuntimeRequestException("Request " + request + " failed to process", e);
+ throw previousFailure;
+ }
+ }
+
+ @Nullable
+ abstract TransactionSuccess<?> doHandleRequest(TransactionRequest<?> request, RequestEnvelope envelope,
+ long now) throws RequestException;
private void recordResponse(final long sequence, final Object response) {
if (replayQueue.isEmpty()) {