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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 static java.lang.Math.max;
/**
* Binary message flags to be passed as {@code flags} field of {@link Message}.
*/
public enum MessageFlag
{
/** a failure response should be sent back in case of failure */
CALL_BACK_ON_FAILURE (0),
/** track repaired data - see CASSANDRA-14145 */
TRACK_REPAIRED_DATA (1),
/** allow creating warnings or aborting queries based off query - see CASSANDRA-16850 */
TRACK_WARNINGS(2);
private final int id;
MessageFlag(int id)
{
this.id = id;
}
/**
* @return {@code true} if the flag is present in provided flags, {@code false} otherwise
*/
boolean isIn(int flags)
{
return (flags & (1 << id)) != 0;
}
/**
* @return new flags value with this flag added
*/
int addTo(int flags)
{
return flags | (1 << id);
}
private static final MessageFlag[] idToFlagMap;
static
{
MessageFlag[] flags = values();
int max = -1;
for (MessageFlag flag : flags)
max = max(flag.id, max);
MessageFlag[] idMap = new MessageFlag[max + 1];
for (MessageFlag flag : flags)
{
if (idMap[flag.id] != null)
throw new RuntimeException("Two MessageFlag-s that map to the same id: " + flag.id);
idMap[flag.id] = flag;
}
idToFlagMap = idMap;
}
@SuppressWarnings("unused")
MessageFlag lookUpById(int id)
{
if (id < 0)
throw new IllegalArgumentException("MessageFlag id must be non-negative (got " + id + ')');
return id < idToFlagMap.length ? idToFlagMap[id] : null;
}
}