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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.net;
import com.google.common.base.Preconditions;
import org.apache.cassandra.io.IVersionedSerializer;
import org.apache.cassandra.io.util.DataInputPlus;
import org.apache.cassandra.io.util.DataOutputPlus;
import org.apache.cassandra.locator.InetAddressAndPort;
import java.io.IOException;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.function.BiConsumer;
import static org.apache.cassandra.locator.InetAddressAndPort.Serializer.inetAddressAndPortSerializer;
import static org.apache.cassandra.net.MessagingService.VERSION_40;
import static org.apache.cassandra.utils.vint.VIntCoding.computeUnsignedVIntSize;
/**
* A container used to store a node -> message_id map for inter-DC write forwarding.
* We pick one node in each external DC to forward the message to its local peers.
*
*/
public final class ForwardingInfo implements Serializable
{
final List targets;
final long[] messageIds;
public ForwardingInfo(List targets, long[] messageIds)
{
Preconditions.checkArgument(targets.size() == messageIds.length);
this.targets = targets;
this.messageIds = messageIds;
}
/**
* Apply the provided consumer to all (host, message_id) pairs.
*/
public void forEach(BiConsumer biConsumer)
{
for (int i = 0; i < messageIds.length; i++)
biConsumer.accept(messageIds[i], targets.get(i));
}
static final IVersionedSerializer serializer = new IVersionedSerializer()
{
public void serialize(ForwardingInfo forwardTo, DataOutputPlus out, int version) throws IOException
{
assert version >= VERSION_40;
long[] ids = forwardTo.messageIds;
List targets = forwardTo.targets;
int count = ids.length;
out.writeUnsignedVInt32(count);
for (int i = 0; i < count; i++)
{
inetAddressAndPortSerializer.serialize(targets.get(i), out, version);
out.writeUnsignedVInt(ids[i]);
}
}
public long serializedSize(ForwardingInfo forwardTo, int version)
{
assert version >= VERSION_40;
long[] ids = forwardTo.messageIds;
List targets = forwardTo.targets;
int count = ids.length;
long size = computeUnsignedVIntSize(count);
for (int i = 0; i < count; i++)
{
size += inetAddressAndPortSerializer.serializedSize(targets.get(i), version);
size += computeUnsignedVIntSize(ids[i]);
}
return size;
}
public ForwardingInfo deserialize(DataInputPlus in, int version) throws IOException
{
assert version >= VERSION_40;
int count = in.readUnsignedVInt32();
long[] ids = new long[count];
List targets = new ArrayList<>(count);
for (int i = 0; i < count; i++)
{
targets.add(inetAddressAndPortSerializer.deserialize(in, version));
ids[i] = in.readUnsignedVInt32();
}
return new ForwardingInfo(targets, ids);
}
};
}