X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?p=controller.git;a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-distributed-datastore%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fcluster%2Fdatastore%2FTransactionProxy.java;h=2e7b2feb85bd97c7b80d09b8156f4b44c6fb343e;hp=74245c42592ca3d6743d0aef3b48bb2e6ace2b45;hb=e90bec01888e6b2a2503d21de25f3a674d607163;hpb=c1362c86eb19e92e6c64d10099a45deb499c6db1 diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/TransactionProxy.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/TransactionProxy.java index 74245c4259..2e7b2feb85 100644 --- a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/TransactionProxy.java +++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/TransactionProxy.java @@ -10,12 +10,22 @@ package org.opendaylight.controller.cluster.datastore; import akka.actor.ActorPath; import akka.actor.ActorSelection; +import akka.dispatch.OnComplete; + +import com.google.common.annotations.VisibleForTesting; import com.google.common.base.Optional; -import com.google.common.util.concurrent.ListenableFuture; -import com.google.common.util.concurrent.ListenableFutureTask; +import com.google.common.base.Preconditions; +import com.google.common.collect.Lists; +import com.google.common.util.concurrent.CheckedFuture; +import com.google.common.util.concurrent.Futures; +import com.google.common.util.concurrent.SettableFuture; + +import org.opendaylight.controller.cluster.datastore.identifiers.TransactionIdentifier; import org.opendaylight.controller.cluster.datastore.messages.CloseTransaction; import org.opendaylight.controller.cluster.datastore.messages.CreateTransaction; import org.opendaylight.controller.cluster.datastore.messages.CreateTransactionReply; +import org.opendaylight.controller.cluster.datastore.messages.DataExists; +import org.opendaylight.controller.cluster.datastore.messages.DataExistsReply; import org.opendaylight.controller.cluster.datastore.messages.DeleteData; import org.opendaylight.controller.cluster.datastore.messages.MergeData; import org.opendaylight.controller.cluster.datastore.messages.ReadData; @@ -23,18 +33,25 @@ import org.opendaylight.controller.cluster.datastore.messages.ReadDataReply; import org.opendaylight.controller.cluster.datastore.messages.ReadyTransaction; import org.opendaylight.controller.cluster.datastore.messages.ReadyTransactionReply; import org.opendaylight.controller.cluster.datastore.messages.WriteData; +import org.opendaylight.controller.cluster.datastore.shardstrategy.ShardStrategyFactory; import org.opendaylight.controller.cluster.datastore.utils.ActorContext; +import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException; import org.opendaylight.controller.sal.core.spi.data.DOMStoreReadWriteTransaction; import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort; -import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier; +import org.opendaylight.yangtools.util.concurrent.MappingCheckedFuture; +import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier; import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode; +import org.opendaylight.yangtools.yang.model.api.SchemaContext; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import scala.Function1; +import scala.concurrent.Future; +import scala.runtime.AbstractFunction1; -import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; -import java.util.concurrent.Callable; -import java.util.concurrent.ExecutorService; import java.util.concurrent.atomic.AtomicLong; /** @@ -56,98 +73,147 @@ public class TransactionProxy implements DOMStoreReadWriteTransaction { READ_WRITE } + static Function1 SAME_FAILURE_TRANSFORMER = new AbstractFunction1< + Throwable, Throwable>() { + @Override + public Throwable apply(Throwable failure) { + return failure; + } + }; + private static final AtomicLong counter = new AtomicLong(); + private static final Logger + LOG = LoggerFactory.getLogger(TransactionProxy.class); + + private final TransactionType transactionType; private final ActorContext actorContext; - private final Map remoteTransactionPaths = new HashMap<>(); - private final String identifier; - private final ExecutorService executor; + private final Map remoteTransactionPaths = new HashMap<>(); + private final TransactionIdentifier identifier; + private final SchemaContext schemaContext; + private boolean inReadyState; + + public TransactionProxy(ActorContext actorContext, TransactionType transactionType, + SchemaContext schemaContext) { + this.actorContext = Preconditions.checkNotNull(actorContext, "actorContext should not be null"); + this.transactionType = Preconditions.checkNotNull(transactionType, "transactionType should not be null"); + this.schemaContext = Preconditions.checkNotNull(schemaContext, "schemaContext should not be null"); + + String memberName = actorContext.getCurrentMemberName(); + if(memberName == null){ + memberName = "UNKNOWN-MEMBER"; + } + + this.identifier = TransactionIdentifier.builder().memberName(memberName).counter( + counter.getAndIncrement()).build(); - public TransactionProxy( - ActorContext actorContext, - TransactionType transactionType, - ExecutorService executor - ) { + LOG.debug("Created txn {} of type {}", identifier, transactionType); - this.identifier = "txn-" + counter.getAndIncrement(); - this.transactionType = transactionType; - this.actorContext = actorContext; - this.executor = executor; + } - Object response = actorContext.executeShardOperation(Shard.DEFAULT_NAME, new CreateTransaction(identifier), ActorContext.ASK_DURATION); - if(response instanceof CreateTransactionReply){ - CreateTransactionReply reply = (CreateTransactionReply) response; - remoteTransactionPaths.put(Shard.DEFAULT_NAME, actorContext.actorSelection(reply.getTransactionPath())); + @VisibleForTesting + List> getRecordedOperationFutures() { + List> recordedOperationFutures = Lists.newArrayList(); + for(TransactionContext transactionContext : remoteTransactionPaths.values()) { + recordedOperationFutures.addAll(transactionContext.getRecordedOperationFutures()); } + + return recordedOperationFutures; } @Override - public ListenableFuture>> read(final InstanceIdentifier path) { - final ActorSelection remoteTransaction = remoteTransactionFromIdentifier(path); - - Callable>> call = new Callable() { - - @Override public Optional> call() throws Exception { - Object response = actorContext - .executeRemoteOperation(remoteTransaction, new ReadData(path), - ActorContext.ASK_DURATION); - if(response instanceof ReadDataReply){ - ReadDataReply reply = (ReadDataReply) response; - if(reply.getNormalizedNode() == null){ - return Optional.absent(); - } - //FIXME : A cast should not be required here ??? - return (Optional>) Optional.of(reply.getNormalizedNode()); - } + public CheckedFuture>, ReadFailedException> read( + final YangInstanceIdentifier path) { - return Optional.absent(); - } - }; + Preconditions.checkState(transactionType != TransactionType.WRITE_ONLY, + "Read operation on write-only transaction is not allowed"); + + LOG.debug("Tx {} read {}", identifier, path); + + createTransactionIfMissing(actorContext, path); + + return transactionContext(path).readData(path); + } + + @Override + public CheckedFuture exists(YangInstanceIdentifier path) { - ListenableFutureTask>> - future = ListenableFutureTask.create(call); + Preconditions.checkState(transactionType != TransactionType.WRITE_ONLY, + "Exists operation on write-only transaction is not allowed"); - executor.submit(future); + LOG.debug("Tx {} exists {}", identifier, path); - return future; + createTransactionIfMissing(actorContext, path); + + return transactionContext(path).dataExists(path); + } + + private void checkModificationState() { + Preconditions.checkState(transactionType != TransactionType.READ_ONLY, + "Modification operation on read-only transaction is not allowed"); + Preconditions.checkState(!inReadyState, + "Transaction is sealed - further modifications are allowed"); } @Override - public void write(InstanceIdentifier path, NormalizedNode data) { - final ActorSelection remoteTransaction = remoteTransactionFromIdentifier(path); - remoteTransaction.tell(new WriteData(path, data), null); + public void write(YangInstanceIdentifier path, NormalizedNode data) { + + checkModificationState(); + + LOG.debug("Tx {} write {}", identifier, path); + + createTransactionIfMissing(actorContext, path); + + transactionContext(path).writeData(path, data); } @Override - public void merge(InstanceIdentifier path, NormalizedNode data) { - final ActorSelection remoteTransaction = remoteTransactionFromIdentifier(path); - remoteTransaction.tell(new MergeData(path, data), null); + public void merge(YangInstanceIdentifier path, NormalizedNode data) { + + checkModificationState(); + + LOG.debug("Tx {} merge {}", identifier, path); + + createTransactionIfMissing(actorContext, path); + + transactionContext(path).mergeData(path, data); } @Override - public void delete(InstanceIdentifier path) { - final ActorSelection remoteTransaction = remoteTransactionFromIdentifier(path); - remoteTransaction.tell(new DeleteData(path), null); + public void delete(YangInstanceIdentifier path) { + + checkModificationState(); + + LOG.debug("Tx {} delete {}", identifier, path); + + createTransactionIfMissing(actorContext, path); + + transactionContext(path).deleteData(path); } @Override public DOMStoreThreePhaseCommitCohort ready() { - List cohortPaths = new ArrayList<>(); - for(ActorSelection remoteTransaction : remoteTransactionPaths.values()) { - Object result = actorContext.executeRemoteOperation(remoteTransaction, - new ReadyTransaction(), - ActorContext.ASK_DURATION - ); + checkModificationState(); - if(result instanceof ReadyTransactionReply){ - ReadyTransactionReply reply = (ReadyTransactionReply) result; - cohortPaths.add(reply.getCohortPath()); - } + inReadyState = true; + + LOG.debug("Tx {} Trying to get {} transactions ready for commit", identifier, + remoteTransactionPaths.size()); + + List> cohortPathFutures = Lists.newArrayList(); + + for(TransactionContext transactionContext : remoteTransactionPaths.values()) { + + LOG.debug("Tx {} Readying transaction for shard {}", identifier, + transactionContext.getShardName()); + + cohortPathFutures.add(transactionContext.readyTransaction()); } - return new ThreePhaseCommitCohortProxy(actorContext, cohortPaths, identifier, executor); + return new ThreePhaseCommitCohortProxy(actorContext, cohortPathFutures, + identifier.toString()); } @Override @@ -157,17 +223,434 @@ public class TransactionProxy implements DOMStoreReadWriteTransaction { @Override public void close() { - for(ActorSelection remoteTransaction : remoteTransactionPaths.values()) { - remoteTransaction.tell(new CloseTransaction(), null); + for(TransactionContext transactionContext : remoteTransactionPaths.values()) { + transactionContext.closeTransaction(); } } - private ActorSelection remoteTransactionFromIdentifier(InstanceIdentifier path){ + private TransactionContext transactionContext(YangInstanceIdentifier path){ String shardName = shardNameFromIdentifier(path); return remoteTransactionPaths.get(shardName); } - private String shardNameFromIdentifier(InstanceIdentifier path){ - return Shard.DEFAULT_NAME; + private String shardNameFromIdentifier(YangInstanceIdentifier path){ + return ShardStrategyFactory.getStrategy(path).findShard(path); + } + + private void createTransactionIfMissing(ActorContext actorContext, YangInstanceIdentifier path) { + String shardName = ShardStrategyFactory.getStrategy(path).findShard(path); + + TransactionContext transactionContext = + remoteTransactionPaths.get(shardName); + + if(transactionContext != null){ + // A transaction already exists with that shard + return; + } + + try { + Object response = actorContext.executeShardOperation(shardName, + new CreateTransaction(identifier.toString(),this.transactionType.ordinal() ).toSerializable(), + ActorContext.ASK_DURATION); + if (response.getClass().equals(CreateTransactionReply.SERIALIZABLE_CLASS)) { + CreateTransactionReply reply = + CreateTransactionReply.fromSerializable(response); + + String transactionPath = reply.getTransactionPath(); + + LOG.debug("Tx {} Received transaction path = {}", identifier, transactionPath); + + ActorSelection transactionActor = + actorContext.actorSelection(transactionPath); + transactionContext = + new TransactionContextImpl(shardName, transactionPath, + transactionActor); + + remoteTransactionPaths.put(shardName, transactionContext); + } else { + throw new IllegalArgumentException(String.format( + "Invalid reply type {} for CreateTransaction", response.getClass())); + } + } catch(Exception e){ + LOG.debug("Tx {} Creating NoOpTransaction because of : {}", identifier, e.getMessage()); + remoteTransactionPaths.put(shardName, new NoOpTransactionContext(shardName, e)); + } + } + + private interface TransactionContext { + String getShardName(); + + void closeTransaction(); + + Future readyTransaction(); + + void writeData(YangInstanceIdentifier path, NormalizedNode data); + + void deleteData(YangInstanceIdentifier path); + + void mergeData(YangInstanceIdentifier path, NormalizedNode data); + + CheckedFuture>, ReadFailedException> readData( + final YangInstanceIdentifier path); + + CheckedFuture dataExists(YangInstanceIdentifier path); + + List> getRecordedOperationFutures(); + } + + private abstract class AbstractTransactionContext implements TransactionContext { + + protected final String shardName; + protected final List> recordedOperationFutures = Lists.newArrayList(); + + AbstractTransactionContext(String shardName) { + this.shardName = shardName; + } + + @Override + public String getShardName() { + return shardName; + } + + @Override + public List> getRecordedOperationFutures() { + return recordedOperationFutures; + } + } + + private class TransactionContextImpl extends AbstractTransactionContext { + private final Logger LOG = LoggerFactory.getLogger(TransactionContextImpl.class); + + private final String actorPath; + private final ActorSelection actor; + + private TransactionContextImpl(String shardName, String actorPath, + ActorSelection actor) { + super(shardName); + this.actorPath = actorPath; + this.actor = actor; + } + + private ActorSelection getActor() { + return actor; + } + + private String getResolvedCohortPath(String cohortPath) { + return actorContext.resolvePath(actorPath, cohortPath); + } + + @Override + public void closeTransaction() { + LOG.debug("Tx {} closeTransaction called", identifier); + actorContext.sendRemoteOperationAsync(getActor(), new CloseTransaction().toSerializable()); + } + + @Override + public Future readyTransaction() { + LOG.debug("Tx {} readyTransaction called with {} previous recorded operations pending", + identifier, recordedOperationFutures.size()); + + // Send the ReadyTransaction message to the Tx actor. + + final Future replyFuture = actorContext.executeRemoteOperationAsync(getActor(), + new ReadyTransaction().toSerializable(), ActorContext.ASK_DURATION); + + // Combine all the previously recorded put/merge/delete operation reply Futures and the + // ReadyTransactionReply Future into one Future. If any one fails then the combined + // Future will fail. We need all prior operations and the ready operation to succeed + // in order to attempt commit. + + List> futureList = + Lists.newArrayListWithCapacity(recordedOperationFutures.size() + 1); + futureList.addAll(recordedOperationFutures); + futureList.add(replyFuture); + + Future> combinedFutures = akka.dispatch.Futures.sequence(futureList, + actorContext.getActorSystem().dispatcher()); + + // Transform the combined Future into a Future that returns the cohort actor path from + // the ReadyTransactionReply. That's the end result of the ready operation. + + return combinedFutures.transform(new AbstractFunction1, ActorPath>() { + @Override + public ActorPath apply(Iterable notUsed) { + + LOG.debug("Tx {} readyTransaction: pending recorded operations succeeded", + identifier); + + // At this point all the Futures succeeded and we need to extract the cohort + // actor path from the ReadyTransactionReply. For the recorded operations, they + // don't return any data so we're only interested that they completed + // successfully. We could be paranoid and verify the correct reply types but + // that really should never happen so it's not worth the overhead of + // de-serializing each reply. + + // Note the Future get call here won't block as it's complete. + Object serializedReadyReply = replyFuture.value().get().get(); + if(serializedReadyReply.getClass().equals( + ReadyTransactionReply.SERIALIZABLE_CLASS)) { + ReadyTransactionReply reply = ReadyTransactionReply.fromSerializable( + actorContext.getActorSystem(), serializedReadyReply); + + String resolvedCohortPath = getResolvedCohortPath( + reply.getCohortPath().toString()); + + LOG.debug("Tx {} readyTransaction: resolved cohort path {}", + identifier, resolvedCohortPath); + + return actorContext.actorFor(resolvedCohortPath); + } else { + // Throwing an exception here will fail the Future. + + throw new IllegalArgumentException(String.format("Invalid reply type {}", + serializedReadyReply.getClass())); + } + } + }, SAME_FAILURE_TRANSFORMER, actorContext.getActorSystem().dispatcher()); + } + + @Override + public void deleteData(YangInstanceIdentifier path) { + LOG.debug("Tx {} deleteData called path = {}", identifier, path); + recordedOperationFutures.add(actorContext.executeRemoteOperationAsync(getActor(), + new DeleteData(path).toSerializable(), ActorContext.ASK_DURATION )); + } + + @Override + public void mergeData(YangInstanceIdentifier path, NormalizedNode data) { + LOG.debug("Tx {} mergeData called path = {}", identifier, path); + recordedOperationFutures.add(actorContext.executeRemoteOperationAsync(getActor(), + new MergeData(path, data, schemaContext).toSerializable(), + ActorContext.ASK_DURATION)); + } + + @Override + public void writeData(YangInstanceIdentifier path, NormalizedNode data) { + LOG.debug("Tx {} writeData called path = {}", identifier, path); + recordedOperationFutures.add(actorContext.executeRemoteOperationAsync(getActor(), + new WriteData(path, data, schemaContext).toSerializable(), + ActorContext.ASK_DURATION)); + } + + @Override + public CheckedFuture>, ReadFailedException> readData( + final YangInstanceIdentifier path) { + + LOG.debug("Tx {} readData called path = {}", identifier, path); + + final SettableFuture>> returnFuture = SettableFuture.create(); + + // If there were any previous recorded put/merge/delete operation reply Futures then we + // must wait for them to successfully complete. This is necessary to honor the read + // uncommitted semantics of the public API contract. If any one fails then fail the read. + + if(recordedOperationFutures.isEmpty()) { + finishReadData(path, returnFuture); + } else { + LOG.debug("Tx {} readData: verifying {} previous recorded operations", + identifier, recordedOperationFutures.size()); + + // Note: we make a copy of recordedOperationFutures to be on the safe side in case + // Futures#sequence accesses the passed List on a different thread, as + // recordedOperationFutures is not synchronized. + + Future> combinedFutures = akka.dispatch.Futures.sequence( + Lists.newArrayList(recordedOperationFutures), + actorContext.getActorSystem().dispatcher()); + OnComplete> onComplete = new OnComplete>() { + @Override + public void onComplete(Throwable failure, Iterable notUsed) + throws Throwable { + if(failure != null) { + LOG.debug("Tx {} readData: a recorded operation failed: {}", + identifier, failure); + + returnFuture.setException(new ReadFailedException( + "The read could not be performed because a previous put, merge," + + "or delete operation failed", failure)); + } else { + finishReadData(path, returnFuture); + } + } + }; + + combinedFutures.onComplete(onComplete, actorContext.getActorSystem().dispatcher()); + } + + return MappingCheckedFuture.create(returnFuture, ReadFailedException.MAPPER); + } + + private void finishReadData(final YangInstanceIdentifier path, + final SettableFuture>> returnFuture) { + + LOG.debug("Tx {} finishReadData called path = {}", identifier, path); + + OnComplete onComplete = new OnComplete() { + @Override + public void onComplete(Throwable failure, Object readResponse) throws Throwable { + if(failure != null) { + LOG.debug("Tx {} read operation failed: {}", identifier, failure); + + returnFuture.setException(new ReadFailedException( + "Error reading data for path " + path, failure)); + } else { + LOG.debug("Tx {} read operation succeeded", identifier, failure); + + if (readResponse.getClass().equals(ReadDataReply.SERIALIZABLE_CLASS)) { + ReadDataReply reply = ReadDataReply.fromSerializable(schemaContext, + path, readResponse); + if (reply.getNormalizedNode() == null) { + returnFuture.set(Optional.>absent()); + } else { + returnFuture.set(Optional.>of( + reply.getNormalizedNode())); + } + } else { + returnFuture.setException(new ReadFailedException( + "Invalid response reading data for path " + path)); + } + } + } + }; + + Future readFuture = actorContext.executeRemoteOperationAsync(getActor(), + new ReadData(path).toSerializable(), ActorContext.ASK_DURATION); + readFuture.onComplete(onComplete, actorContext.getActorSystem().dispatcher()); + } + + @Override + public CheckedFuture dataExists( + final YangInstanceIdentifier path) { + + LOG.debug("Tx {} dataExists called path = {}", identifier, path); + + final SettableFuture returnFuture = SettableFuture.create(); + + // If there were any previous recorded put/merge/delete operation reply Futures then we + // must wait for them to successfully complete. This is necessary to honor the read + // uncommitted semantics of the public API contract. If any one fails then fail this + // request. + + if(recordedOperationFutures.isEmpty()) { + finishDataExists(path, returnFuture); + } else { + LOG.debug("Tx {} dataExists: verifying {} previous recorded operations", + identifier, recordedOperationFutures.size()); + + // Note: we make a copy of recordedOperationFutures to be on the safe side in case + // Futures#sequence accesses the passed List on a different thread, as + // recordedOperationFutures is not synchronized. + + Future> combinedFutures = akka.dispatch.Futures.sequence( + Lists.newArrayList(recordedOperationFutures), + actorContext.getActorSystem().dispatcher()); + OnComplete> onComplete = new OnComplete>() { + @Override + public void onComplete(Throwable failure, Iterable notUsed) + throws Throwable { + if(failure != null) { + LOG.debug("Tx {} dataExists: a recorded operation failed: {}", + identifier, failure); + + returnFuture.setException(new ReadFailedException( + "The data exists could not be performed because a previous " + + "put, merge, or delete operation failed", failure)); + } else { + finishDataExists(path, returnFuture); + } + } + }; + + combinedFutures.onComplete(onComplete, actorContext.getActorSystem().dispatcher()); + } + + return MappingCheckedFuture.create(returnFuture, ReadFailedException.MAPPER); + } + + private void finishDataExists(final YangInstanceIdentifier path, + final SettableFuture returnFuture) { + + LOG.debug("Tx {} finishDataExists called path = {}", identifier, path); + + OnComplete onComplete = new OnComplete() { + @Override + public void onComplete(Throwable failure, Object response) throws Throwable { + if(failure != null) { + LOG.debug("Tx {} dataExists operation failed: {}", identifier, failure); + + returnFuture.setException(new ReadFailedException( + "Error checking data exists for path " + path, failure)); + } else { + LOG.debug("Tx {} dataExists operation succeeded", identifier, failure); + + if (response.getClass().equals(DataExistsReply.SERIALIZABLE_CLASS)) { + returnFuture.set(Boolean.valueOf(DataExistsReply. + fromSerializable(response).exists())); + } else { + returnFuture.setException(new ReadFailedException( + "Invalid response checking exists for path " + path)); + } + } + } + }; + + Future future = actorContext.executeRemoteOperationAsync(getActor(), + new DataExists(path).toSerializable(), ActorContext.ASK_DURATION); + future.onComplete(onComplete, actorContext.getActorSystem().dispatcher()); + } + } + + private class NoOpTransactionContext extends AbstractTransactionContext { + + private final Logger LOG = LoggerFactory.getLogger(NoOpTransactionContext.class); + + private final Exception failure; + + public NoOpTransactionContext(String shardName, Exception failure){ + super(shardName); + this.failure = failure; + } + + @Override + public void closeTransaction() { + LOG.debug("NoOpTransactionContext {} closeTransaction called", identifier); + } + + @Override + public Future readyTransaction() { + LOG.debug("Tx {} readyTransaction called", identifier); + return akka.dispatch.Futures.failed(failure); + } + + @Override + public void deleteData(YangInstanceIdentifier path) { + LOG.debug("Tx {} deleteData called path = {}", identifier, path); + } + + @Override + public void mergeData(YangInstanceIdentifier path, NormalizedNode data) { + LOG.debug("Tx {} mergeData called path = {}", identifier, path); + } + + @Override + public void writeData(YangInstanceIdentifier path, NormalizedNode data) { + LOG.debug("Tx {} writeData called path = {}", identifier, path); + } + + @Override + public CheckedFuture>, ReadFailedException> readData( + YangInstanceIdentifier path) { + LOG.debug("Tx {} readData called path = {}", identifier, path); + return Futures.immediateFailedCheckedFuture(new ReadFailedException( + "Error reading data for path " + path, failure)); + } + + @Override + public CheckedFuture dataExists( + YangInstanceIdentifier path) { + LOG.debug("Tx {} dataExists called path = {}", identifier, path); + return Futures.immediateFailedCheckedFuture(new ReadFailedException( + "Error checking exists for path " + path, failure)); + } } }