| 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.util.UUID; |
| |
| import org.apache.cassandra.db.TypeSizes; |
| import org.apache.cassandra.db.rows.SerializationHelper; |
| 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.utils.UUIDSerializer; |
| |
| public class PrepareResponse |
| { |
| public static final PrepareResponseSerializer serializer = new PrepareResponseSerializer(); |
| |
| public final boolean promised; |
| |
| /* |
| * To maintain backward compatibility (see #6023), the meaning of inProgressCommit is a bit tricky. |
| * If promised is true, then that's the last accepted commit. If promise is false, that's just |
| * the previously promised ballot that made us refuse this one. |
| */ |
| public final Commit inProgressCommit; |
| public final Commit mostRecentCommit; |
| |
| public PrepareResponse(boolean promised, Commit inProgressCommit, Commit mostRecentCommit) |
| { |
| assert inProgressCommit.update.partitionKey().equals(mostRecentCommit.update.partitionKey()); |
| assert inProgressCommit.update.metadata() == mostRecentCommit.update.metadata(); |
| |
| this.promised = promised; |
| this.mostRecentCommit = mostRecentCommit; |
| this.inProgressCommit = inProgressCommit; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return String.format("PrepareResponse(%s, %s, %s)", promised, mostRecentCommit, inProgressCommit); |
| } |
| |
| public static class PrepareResponseSerializer implements IVersionedSerializer<PrepareResponse> |
| { |
| public void serialize(PrepareResponse response, DataOutputPlus out, int version) throws IOException |
| { |
| out.writeBoolean(response.promised); |
| Commit.serializer.serialize(response.inProgressCommit, out, version); |
| |
| if (version < MessagingService.VERSION_30) |
| { |
| UUIDSerializer.serializer.serialize(response.mostRecentCommit.ballot, out, version); |
| PartitionUpdate.serializer.serialize(response.mostRecentCommit.update, out, version); |
| } |
| else |
| { |
| Commit.serializer.serialize(response.mostRecentCommit, out, version); |
| } |
| } |
| |
| public PrepareResponse deserialize(DataInputPlus in, int version) throws IOException |
| { |
| boolean success = in.readBoolean(); |
| Commit inProgress = Commit.serializer.deserialize(in, version); |
| Commit mostRecent; |
| if (version < MessagingService.VERSION_30) |
| { |
| UUID ballot = UUIDSerializer.serializer.deserialize(in, version); |
| PartitionUpdate update = PartitionUpdate.serializer.deserialize(in, version, SerializationHelper.Flag.LOCAL, inProgress.update.partitionKey()); |
| mostRecent = new Commit(ballot, update); |
| } |
| else |
| { |
| mostRecent = Commit.serializer.deserialize(in, version); |
| } |
| return new PrepareResponse(success, inProgress, mostRecent); |
| } |
| |
| public long serializedSize(PrepareResponse response, int version) |
| { |
| long size = TypeSizes.sizeof(response.promised) |
| + Commit.serializer.serializedSize(response.inProgressCommit, version); |
| |
| if (version < MessagingService.VERSION_30) |
| { |
| size += UUIDSerializer.serializer.serializedSize(response.mostRecentCommit.ballot, version); |
| size += PartitionUpdate.serializer.serializedSize(response.mostRecentCommit.update, version); |
| } |
| else |
| { |
| size += Commit.serializer.serializedSize(response.mostRecentCommit, version); |
| } |
| return size; |
| } |
| } |
| } |