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Core sketch algorithms used alone and by other Java repositories in the DataSketches library.
/*
* 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.datasketches.tuple.arrayofdoubles;
import org.apache.datasketches.memory.WritableMemory;
/**
* Direct Intersection operation for tuple sketches of type ArrayOfDoubles.
* This implementation uses data in a given Memory that is owned and managed by the caller.
* This Memory can be off-heap, which if managed properly will greatly reduce the need for
* the JVM to perform garbage collection.
*/
final class DirectArrayOfDoublesIntersection extends ArrayOfDoublesIntersection {
private WritableMemory mem_;
/**
* Creates an instance of a DirectArrayOfDoublesIntersection with a custom update seed
* @param numValues number of double values associated with each key
* @param seed See seed
* @param dstMem See Memory
*/
DirectArrayOfDoublesIntersection(final int numValues, final long seed, final WritableMemory dstMem) {
super(numValues, seed);
mem_ = dstMem;
}
@Override
protected ArrayOfDoublesQuickSelectSketch createSketch(final int nomEntries, final int numValues,
final long seed) {
return new DirectArrayOfDoublesQuickSelectSketch(nomEntries, 0, 1f, numValues, seed, mem_);
}
}
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