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/*
* 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.cache;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicLong;
import com.google.common.base.Objects;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.db.ArrayBackedSortedColumns;
import org.apache.cassandra.db.ColumnFamily;
/**
* A sentinel object for row caches. See comments to getThroughCache and CASSANDRA-3862.
*/
public class RowCacheSentinel implements IRowCacheEntry
{
private static final AtomicLong generator = new AtomicLong();
final long sentinelId;
public RowCacheSentinel()
{
sentinelId = generator.getAndIncrement();
}
RowCacheSentinel(long sentinelId)
{
this.sentinelId = sentinelId;
}
@Override
public boolean equals(Object o)
{
if (!(o instanceof RowCacheSentinel)) return false;
RowCacheSentinel other = (RowCacheSentinel) o;
return this.sentinelId == other.sentinelId;
}
@Override
public int hashCode()
{
return Objects.hashCode(sentinelId);
}
}