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/*
* Copyright (c) 2014 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,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.controller.cluster.datastore;
import static java.util.Objects.requireNonNull;
import akka.actor.ActorRef;
import akka.actor.PoisonPill;
import akka.actor.Props;
import akka.actor.ReceiveTimeout;
import akka.japi.Creator;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import org.opendaylight.controller.cluster.access.concepts.TransactionIdentifier;
import org.opendaylight.controller.cluster.common.actor.AbstractUntypedActorWithMetering;
import org.opendaylight.controller.cluster.datastore.messages.CloseTransaction;
import org.opendaylight.controller.cluster.datastore.messages.CloseTransactionReply;
import org.opendaylight.controller.cluster.datastore.messages.DataExists;
import org.opendaylight.controller.cluster.datastore.messages.DataExistsReply;
import org.opendaylight.controller.cluster.datastore.messages.ReadData;
import org.opendaylight.controller.cluster.datastore.messages.ReadDataReply;
import org.opendaylight.mdsal.common.api.ReadFailedException;
import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
/**
* The ShardTransaction Actor represents a remote transaction that delegates all actions to DOMDataReadWriteTransaction.
*/
public abstract class ShardTransaction extends AbstractUntypedActorWithMetering {
private final ActorRef shardActor;
private final ShardStats shardStats;
private final TransactionIdentifier transactionId;
protected ShardTransaction(final ActorRef shardActor, final ShardStats shardStats,
final TransactionIdentifier transactionId) {
// actor name override used for metering. This does not change the "real" actor name
super("shard-tx");
this.shardActor = shardActor;
this.shardStats = shardStats;
this.transactionId = requireNonNull(transactionId);
}
public static Props props(final TransactionType type, final AbstractShardDataTreeTransaction transaction,
final ActorRef shardActor, final DatastoreContext datastoreContext, final ShardStats shardStats) {
return Props.create(ShardTransaction.class,
new ShardTransactionCreator(type, transaction, shardActor, datastoreContext, shardStats));
}
protected abstract AbstractShardDataTreeTransaction getDOMStoreTransaction();
protected ActorRef getShardActor() {
return shardActor;
}
protected final TransactionIdentifier getTransactionId() {
return transactionId;
}
@Override
public void handleReceive(final Object message) {
if (CloseTransaction.isSerializedType(message)) {
closeTransaction(true);
} else if (message instanceof ReceiveTimeout) {
LOG.debug("Got ReceiveTimeout for inactivity - closing transaction {}", transactionId);
closeTransaction(false);
} else {
unknownMessage(message);
}
}
protected boolean returnCloseTransactionReply() {
return true;
}
private void closeTransaction(final boolean sendReply) {
getDOMStoreTransaction().abortFromTransactionActor();
if (sendReply && returnCloseTransactionReply()) {
getSender().tell(new CloseTransactionReply(), getSelf());
}
getSelf().tell(PoisonPill.getInstance(), getSelf());
}
private boolean checkClosed(final AbstractShardDataTreeTransaction transaction) {
final boolean ret = transaction.isClosed();
if (ret) {
shardStats.incrementFailedReadTransactionsCount();
getSender().tell(new akka.actor.Status.Failure(new ReadFailedException("Transaction is closed")),
getSelf());
}
return ret;
}
protected void readData(final AbstractShardDataTreeTransaction transaction, final ReadData message) {
if (checkClosed(transaction)) {
return;
}
final YangInstanceIdentifier path = message.getPath();
ReadDataReply readDataReply = new ReadDataReply(transaction.getSnapshot().readNode(path).orElse(null),
message.getVersion());
sender().tell(readDataReply.toSerializable(), self());
}
protected void dataExists(final AbstractShardDataTreeTransaction transaction, final DataExists message) {
if (checkClosed(transaction)) {
return;
}
final YangInstanceIdentifier path = message.getPath();
boolean exists = transaction.getSnapshot().readNode(path).isPresent();
getSender().tell(new DataExistsReply(exists, message.getVersion()).toSerializable(), getSelf());
}
@SuppressFBWarnings(value = "SE_BAD_FIELD", justification = "Some fields are not Serializable but we don't "
+ "create remote instances of this actor and thus don't need it to be Serializable.")
private static class ShardTransactionCreator implements Creator {
private static final long serialVersionUID = 1L;
final AbstractShardDataTreeTransaction transaction;
final ActorRef shardActor;
final DatastoreContext datastoreContext;
final ShardStats shardStats;
final TransactionType type;
ShardTransactionCreator(final TransactionType type, final AbstractShardDataTreeTransaction transaction,
final ActorRef shardActor, final DatastoreContext datastoreContext, final ShardStats shardStats) {
this.transaction = requireNonNull(transaction);
this.shardActor = shardActor;
this.shardStats = shardStats;
this.datastoreContext = datastoreContext;
this.type = type;
}
@Override
public ShardTransaction create() {
final ShardTransaction tx;
switch (type) {
case READ_ONLY:
tx = new ShardReadTransaction(transaction, shardActor, shardStats);
break;
case READ_WRITE:
tx = new ShardReadWriteTransaction((ReadWriteShardDataTreeTransaction)transaction, shardActor,
shardStats);
break;
case WRITE_ONLY:
tx = new ShardWriteTransaction((ReadWriteShardDataTreeTransaction)transaction, shardActor,
shardStats);
break;
default:
throw new IllegalArgumentException("Unhandled transaction type " + type);
}
tx.getContext().setReceiveTimeout(datastoreContext.getShardTransactionIdleTimeout());
return tx;
}
}
}
