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A fork of the Apache Cassandra Project ready to embed Elasticsearch.
package org.apache.cassandra.service.paxos;
/*
*
* 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.
*
*/
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.UUID;
import com.google.common.base.Objects;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.rows.*;
import org.apache.cassandra.db.partitions.PartitionUpdate;
import org.apache.cassandra.io.IVersionedSerializer;
import org.apache.cassandra.io.util.DataInputPlus;
import org.apache.cassandra.io.util.DataOutputPlus;
import org.apache.cassandra.net.MessagingService;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.UUIDGen;
import org.apache.cassandra.utils.UUIDSerializer;
public class Commit
{
public static final CommitSerializer serializer = new CommitSerializer();
public final UUID ballot;
public final PartitionUpdate update;
public Commit(UUID ballot, PartitionUpdate update)
{
assert ballot != null;
assert update != null;
this.ballot = ballot;
this.update = update;
}
public static Commit newPrepare(DecoratedKey key, CFMetaData metadata, UUID ballot)
{
return new Commit(ballot, PartitionUpdate.emptyUpdate(metadata, key));
}
public static Commit newProposal(UUID ballot, PartitionUpdate update)
{
update.updateAllTimestamp(UUIDGen.microsTimestamp(ballot));
return new Commit(ballot, update);
}
public static Commit emptyCommit(DecoratedKey key, CFMetaData metadata)
{
return new Commit(UUIDGen.minTimeUUID(0), PartitionUpdate.emptyUpdate(metadata, key));
}
public boolean isAfter(Commit other)
{
return ballot.timestamp() > other.ballot.timestamp();
}
public boolean hasBallot(UUID ballot)
{
return this.ballot.equals(ballot);
}
public Mutation makeMutation()
{
return new Mutation(update);
}
@Override
public boolean equals(Object o)
{
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Commit commit = (Commit) o;
return ballot.equals(commit.ballot) && update.equals(commit.update);
}
@Override
public int hashCode()
{
return Objects.hashCode(ballot, update);
}
@Override
public String toString()
{
return String.format("Commit(%s, %s)", ballot, update);
}
public static class CommitSerializer implements IVersionedSerializer
{
public void serialize(Commit commit, DataOutputPlus out, int version) throws IOException
{
if (version < MessagingService.VERSION_30)
ByteBufferUtil.writeWithShortLength(commit.update.partitionKey().getKey(), out);
UUIDSerializer.serializer.serialize(commit.ballot, out, version);
PartitionUpdate.serializer.serialize(commit.update, out, version);
}
public Commit deserialize(DataInputPlus in, int version) throws IOException
{
ByteBuffer key = null;
if (version < MessagingService.VERSION_30)
key = ByteBufferUtil.readWithShortLength(in);
UUID ballot = UUIDSerializer.serializer.deserialize(in, version);
PartitionUpdate update = PartitionUpdate.serializer.deserialize(in, version, SerializationHelper.Flag.LOCAL, key);
return new Commit(ballot, update);
}
public long serializedSize(Commit commit, int version)
{
int size = 0;
if (version < MessagingService.VERSION_30)
size += ByteBufferUtil.serializedSizeWithShortLength(commit.update.partitionKey().getKey());
return size
+ UUIDSerializer.serializer.serializedSize(commit.ballot, version)
+ PartitionUpdate.serializer.serializedSize(commit.update, version);
}
}
}