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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 javax.annotation.Nullable;
import org.apache.cassandra.io.IVersionedSerializer;
import org.apache.cassandra.tracing.Tracing;
import org.apache.cassandra.utils.Int32Serializer;
import org.apache.cassandra.utils.Int64Serializer;
import org.apache.cassandra.utils.RangesSerializer;
import org.apache.cassandra.utils.TimeUUID;
import static java.lang.Math.max;
import static org.apache.cassandra.locator.InetAddressAndPort.FwdFrmSerializer.fwdFrmSerializer;
/**
* Type names and serializers for various parameters that can be put in {@link Message} params map.
*
* It should be safe to add new params without bumping messaging version - {@link Message} serializer
* will skip over any params it doesn't recognise.
*
* Please don't add boolean params here. Extend and use {@link MessageFlag} instead.
*
* Do not re-use old, nor fill gaps in the sequence of, ids. New IDs must be higher.
*/
public enum ParamType
{
FORWARD_TO (0, ForwardingInfo.serializer),
RESPOND_TO (1, fwdFrmSerializer),
TRACE_SESSION (5, TimeUUID.Serializer.instance),
TRACE_TYPE (6, Tracing.traceTypeSerializer),
TOMBSTONE_FAIL (8, Int32Serializer.serializer),
TOMBSTONE_WARNING (9, Int32Serializer.serializer),
LOCAL_READ_SIZE_FAIL (10, Int64Serializer.serializer),
LOCAL_READ_SIZE_WARN (11, Int64Serializer.serializer),
ROW_INDEX_READ_SIZE_FAIL (12, Int64Serializer.serializer),
ROW_INDEX_READ_SIZE_WARN (13, Int64Serializer.serializer),
CUSTOM_MAP (14, CustomParamsSerializer.serializer),
SNAPSHOT_RANGES (15, RangesSerializer.serializer);
final int id;
final IVersionedSerializer serializer;
ParamType(int id, IVersionedSerializer serializer)
{
if (id < 0)
throw new IllegalArgumentException("ParamType id must be non-negative");
this.id = id;
this.serializer = serializer;
}
private static final ParamType[] idToTypeMap;
static
{
ParamType[] types = values();
int max = -1;
for (ParamType t : types)
max = max(t.id, max);
ParamType[] idMap = new ParamType[max + 1];
for (ParamType type : types)
{
if (idMap[type.id] != null)
throw new RuntimeException("Two ParamType-s that map to the same id: " + type.id);
idMap[type.id] = type;
}
idToTypeMap = idMap;
}
@Nullable
static ParamType lookUpById(int id)
{
if (id < 0)
throw new IllegalArgumentException("ParamType id must be non-negative (got " + id + ')');
return id < idToTypeMap.length ? idToTypeMap[id] : null;
}
}