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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.utils;
import java.io.IOException;
import org.apache.cassandra.io.util.DataOutputStreamPlus;
import org.apache.cassandra.utils.concurrent.SharedCloseable;
public interface IFilter extends SharedCloseable
{
interface FilterKey
{
/**
* Places the murmur3 hash of the key in the given long array of size at least two.
*/
void filterHash(long[] dest);
default short filterHashLowerBits()
{
long[] dest = new long[2];
filterHash(dest);
return (short) dest[1];
}
}
void add(FilterKey key);
boolean isPresent(FilterKey key);
void clear();
long serializedSize(boolean oldSerializationFormat);
void serialize(DataOutputStreamPlus out, boolean oldSerializationFormat) throws IOException;
void close();
IFilter sharedCopy();
/**
* Returns the amount of memory in bytes used off heap.
*
* @return the amount of memory in bytes used off heap
*/
long offHeapSize();
boolean isInformative();
}