| /* |
| * 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.service.paxos; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.UUID; |
| |
| import org.apache.cassandra.db.marshal.ValueAccessor; |
| import org.apache.cassandra.io.IVersionedSerializer; |
| import org.apache.cassandra.io.util.DataInputPlus; |
| import org.apache.cassandra.io.util.DataOutputPlus; |
| import org.apache.cassandra.utils.Shared; |
| import org.apache.cassandra.utils.TimeUUID; |
| |
| import static org.apache.cassandra.service.paxos.Ballot.Flag.NONE; |
| import static org.apache.cassandra.utils.ByteArrayUtil.getLong; |
| import static org.apache.cassandra.utils.Shared.Recursive.INTERFACES; |
| import static org.apache.cassandra.utils.Shared.Scope.SIMULATION; |
| |
| @Shared(scope = SIMULATION, inner = INTERFACES) |
| public class Ballot extends TimeUUID |
| { |
| public static final long serialVersionUID = 1L; |
| |
| public enum Flag |
| { |
| NONE, LOCAL, GLOBAL; |
| static final Flag[] FLAGS = values(); |
| } |
| |
| private static final Ballot epoch = atUnixMicrosWithLsb(0, 0, NONE); |
| |
| public static Ballot none() |
| { |
| return epoch; |
| } |
| |
| private Ballot(long rawTimestamp, long lsb) |
| { |
| super(rawTimestamp, lsb); |
| } |
| |
| public boolean equals(Object that) |
| { |
| if (that == null) return false; |
| if (that == this) return true; |
| if (that.getClass() != Ballot.class) return false; |
| return super.equals((TimeUUID) that); |
| } |
| |
| public static Ballot atUnixMicrosWithLsb(long unixMicros, long uniqueLsb, Flag flag) |
| { |
| return new Ballot(unixMicrosToRawTimestamp(unixMicros) + flag.ordinal(), uniqueLsb); |
| } |
| |
| public static Ballot fromUuid(UUID uuid) |
| { |
| return fromBytes(uuid.getMostSignificantBits(), uuid.getLeastSignificantBits()); |
| } |
| |
| public static Ballot fromBytes(long msb, long lsb) |
| { |
| return new Ballot(msbToRawTimestamp(msb), lsb); |
| } |
| |
| public static Ballot fromString(String uuidString) |
| { |
| return fromUuid(UUID.fromString(uuidString)); |
| } |
| |
| public static Ballot deserialize(byte[] bytes) |
| { |
| if (bytes.length == 0) |
| return null; |
| return fromBytes(getLong(bytes, 0), getLong(bytes, 8)); |
| } |
| |
| public static Ballot deserialize(ByteBuffer buffer) |
| { |
| if (!buffer.hasRemaining()) |
| return null; |
| return fromBytes(buffer.getLong(buffer.position()), buffer.getLong(buffer.position() + 8)); |
| } |
| |
| public static Ballot deserialize(DataInputPlus in) throws IOException |
| { |
| long msb = in.readLong(); |
| long lsb = in.readLong(); |
| return fromBytes(msb, lsb); |
| } |
| |
| public Flag flag() |
| { |
| int i = (int)(uuidTimestamp() % 10); |
| if (i < Flag.FLAGS.length) |
| return Flag.FLAGS[i]; |
| return NONE; |
| } |
| |
| |
| public static class Serializer extends AbstractSerializer<Ballot> implements IVersionedSerializer<Ballot> |
| { |
| public static final Serializer instance = new Serializer(); |
| |
| public <V> Ballot deserialize(V value, ValueAccessor<V> accessor) |
| { |
| return accessor.isEmpty(value) ? null : accessor.toBallot(value); |
| } |
| |
| public Class<Ballot> getType() |
| { |
| return Ballot.class; |
| } |
| |
| @Override |
| public void serialize(Ballot t, DataOutputPlus out, int version) throws IOException |
| { |
| t.serialize(out); |
| } |
| |
| @Override |
| public Ballot deserialize(DataInputPlus in, int version) throws IOException |
| { |
| return Ballot.deserialize(in); |
| } |
| |
| @Override |
| public long serializedSize(Ballot t, int version) |
| { |
| return sizeInBytes(); |
| } |
| } |
| |
| } |