/*
* 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 akka.actor.ActorRef;
import akka.actor.ActorSelection;
import akka.actor.Props;
import akka.event.Logging;
import akka.event.LoggingAdapter;
import akka.japi.Creator;
import akka.persistence.Persistent;
import akka.persistence.UntypedProcessor;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;
import org.opendaylight.controller.cluster.datastore.messages.CommitTransactionReply;
import org.opendaylight.controller.cluster.datastore.messages.CreateTransactionChain;
import org.opendaylight.controller.cluster.datastore.messages.CreateTransactionChainReply;
import org.opendaylight.controller.cluster.datastore.messages.ForwardedCommitTransaction;
import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListener;
import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListenerReply;
import org.opendaylight.controller.cluster.datastore.messages.UpdateSchemaContext;
import org.opendaylight.controller.cluster.datastore.modification.Modification;
import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
import org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore;
import org.opendaylight.controller.sal.core.spi.data.DOMStoreThreePhaseCommitCohort;
import org.opendaylight.controller.sal.core.spi.data.DOMStoreTransactionChain;
import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
/**
* A Shard represents a portion of the logical data tree
*
* Our Shard uses InMemoryDataStore as it's internal representation and delegates all requests it
*
*/
public class Shard extends UntypedProcessor {
public static final String DEFAULT_NAME = "default";
private final ListeningExecutorService storeExecutor =
MoreExecutors.listeningDecorator(Executors.newFixedThreadPool(2));
private final InMemoryDOMDataStore store;
private final Map
modificationToCohort = new HashMap<>();
private final LoggingAdapter log =
Logging.getLogger(getContext().system(), this);
private Shard(String name) {
store = new InMemoryDOMDataStore(name, storeExecutor);
}
public static Props props(final String name) {
return Props.create(new Creator() {
@Override
public Shard create() throws Exception {
return new Shard(name);
}
});
}
@Override
public void onReceive(Object message) throws Exception {
if (message instanceof CreateTransactionChain) {
createTransactionChain();
} else if (message instanceof RegisterChangeListener) {
registerChangeListener((RegisterChangeListener) message);
} else if (message instanceof UpdateSchemaContext) {
updateSchemaContext((UpdateSchemaContext) message);
} else if (message instanceof ForwardedCommitTransaction) {
handleForwardedCommit((ForwardedCommitTransaction) message);
} else if (message instanceof Persistent) {
commit((Persistent) message);
}
}
private void commit(Persistent message) {
Modification modification = (Modification) message.payload();
DOMStoreThreePhaseCommitCohort cohort =
modificationToCohort.remove(modification);
if (cohort == null) {
log.error(
"Could not find cohort for modification : " + modification);
return;
}
final ListenableFuture future = cohort.commit();
final ActorRef sender = getSender();
final ActorRef self = getSelf();
future.addListener(new Runnable() {
@Override
public void run() {
try {
future.get();
sender.tell(new CommitTransactionReply(), self);
} catch (InterruptedException | ExecutionException e) {
log.error(e, "An exception happened when committing");
}
}
}, getContext().dispatcher());
}
private void handleForwardedCommit(ForwardedCommitTransaction message) {
log.info("received forwarded transaction");
modificationToCohort
.put(message.getModification(), message.getCohort());
getSelf().forward(Persistent.create(message.getModification()),
getContext());
}
private void updateSchemaContext(UpdateSchemaContext message) {
store.onGlobalContextUpdated(message.getSchemaContext());
}
private void registerChangeListener(
RegisterChangeListener registerChangeListener) {
ActorSelection listenerRegistrationActor = getContext()
.system().actorSelection(registerChangeListener.getDataChangeListenerPath());
AsyncDataChangeListener>
listener = new ListenerProxy(listenerRegistrationActor);
org.opendaylight.yangtools.concepts.ListenerRegistration>>
registration =
store.registerChangeListener(registerChangeListener.getPath(),
listener, registerChangeListener.getScope());
ActorRef listenerRegistration =
getContext().actorOf(ListenerRegistration.props(registration));
getSender()
.tell(new RegisterChangeListenerReply(listenerRegistration.path()),
getSelf());
}
private void createTransactionChain() {
DOMStoreTransactionChain chain = store.createTransactionChain();
ActorRef transactionChain =
getContext().actorOf(ShardTransactionChain.props(chain));
getSender()
.tell(new CreateTransactionChainReply(transactionChain.path()),
getSelf());
}
}