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/*
* Copyright (c) 2016 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.access.commands;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
import akka.actor.ActorRef;
import akka.actor.ActorSelection;
import akka.serialization.JavaSerializer;
import akka.serialization.Serialization;
import com.google.common.base.MoreObjects.ToStringHelper;
import com.google.common.collect.ImmutableList;
import java.io.DataInput;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamException;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import org.eclipse.jdt.annotation.NonNull;
import org.opendaylight.controller.cluster.access.ABIVersion;
import org.opendaylight.controller.cluster.access.concepts.ClientIdentifier;
import org.opendaylight.controller.cluster.access.concepts.RequestSuccess;
import org.opendaylight.yangtools.yang.data.tree.api.ReadOnlyDataTree;
/**
* Successful reply to an {@link ConnectClientRequest}. Client actor which initiated this connection should use
* the version reported via {@link #getVersion()} of this message to communicate with this backend. Should this backend
* fail, the client can try accessing the provided alternates.
*/
public final class ConnectClientSuccess extends RequestSuccess {
interface SerialForm extends RequestSuccess.SerialForm {
@Override
default ClientIdentifier readTarget(final DataInput in) throws IOException {
return ClientIdentifier.readFrom(in);
}
@Override
default ConnectClientSuccess readExternal(final ObjectInput in, final ClientIdentifier target,
final long sequence) throws IOException, ClassNotFoundException {
final var backend = JavaSerializer.currentSystem().value().provider()
.resolveActorRef((String) in.readObject());
final var maxMessages = in.readInt();
final int alternatesSize = in.readInt();
final var alternates = new ArrayList(alternatesSize);
for (int i = 0; i < alternatesSize; ++i) {
alternates.add(ActorSelection.apply(ActorRef.noSender(), (String)in.readObject()));
}
return new ConnectClientSuccess(target, sequence, backend, alternates, maxMessages, null);
}
@Override
default void writeExternal(final ObjectOutput out, final ConnectClientSuccess msg) throws IOException {
out.writeObject(Serialization.serializedActorPath(msg.backend));
out.writeInt(msg.maxMessages);
out.writeInt(msg.alternates.size());
for (ActorSelection b : msg.alternates) {
out.writeObject(b.toSerializationFormat());
}
// We are ignoring the DataTree, it is not serializable anyway
}
}
@java.io.Serial
private static final long serialVersionUID = 1L;
private final @NonNull ImmutableList alternates;
private final ReadOnlyDataTree dataTree;
private final @NonNull ActorRef backend;
private final int maxMessages;
private ConnectClientSuccess(final ConnectClientSuccess success, final ABIVersion version) {
super(success, version);
alternates = success.alternates;
dataTree = success.dataTree;
backend = success.backend;
maxMessages = success.maxMessages;
}
ConnectClientSuccess(final ClientIdentifier target, final long sequence, final ActorRef backend,
final List alternates, final int maxMessages, final ReadOnlyDataTree dataTree) {
super(target, sequence);
this.backend = requireNonNull(backend);
this.alternates = ImmutableList.copyOf(alternates);
this.dataTree = dataTree;
checkArgument(maxMessages > 0, "Maximum messages has to be positive, not %s", maxMessages);
this.maxMessages = maxMessages;
}
public ConnectClientSuccess(final @NonNull ClientIdentifier target, final long sequence,
final @NonNull ActorRef backend, final @NonNull List alternates,
final @NonNull ReadOnlyDataTree dataTree, final int maxMessages) {
this(target, sequence, backend, alternates, maxMessages, requireNonNull(dataTree));
}
/**
* Return the list of known alternate backends. The client can use this list to perform recovery procedures.
*
* @return a list of known backend alternates
*/
public @NonNull List getAlternates() {
return alternates;
}
public @NonNull ActorRef getBackend() {
return backend;
}
public Optional getDataTree() {
return Optional.ofNullable(dataTree);
}
public int getMaxMessages() {
return maxMessages;
}
@Override
protected SerialForm externalizableProxy(final ABIVersion version) {
return new CCS(this);
}
@Override
protected ConnectClientSuccess cloneAsVersion(final ABIVersion version) {
return new ConnectClientSuccess(this, version);
}
@Override
protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
return super.addToStringAttributes(toStringHelper).add("alternates", alternates)
.add("dataTree present", getDataTree().isPresent()).add("maxMessages", maxMessages);
}
@java.io.Serial
private void readObject(final ObjectInputStream stream) throws IOException, ClassNotFoundException {
throwNSE();
}
@java.io.Serial
private void readObjectNoData() throws ObjectStreamException {
throwNSE();
}
@java.io.Serial
private void writeObject(final ObjectOutputStream stream) throws IOException {
throwNSE();
}
}
