/*
 * Licensed 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 com.facebook.presto.operator;

import com.google.common.hash.HashCode;

import java.util.function.Supplier;

public interface LookupSourceSupplier
        extends Supplier<LookupSource>
{
    long getHashCollisions();

    double getExpectedHashCollisions();

    /**
     * @return checksum of this entity for heuristic checking equivalence of two instances
     */
    HashCode checksum();
}
