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JDBC Type 4 driver for MySQL
/*
* Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
* authors of MySQL hereby grant you an additional permission to link the
* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
* http://oss.oracle.com/licenses/universal-foss-exception.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.cj.api.xdevapi;
import java.util.concurrent.CompletableFuture;
import java.util.function.BiFunction;
/**
* A statement that results in a data set of elements as it's result. This interface adds a row-wise callback for async execution.
*/
public interface DataStatement extends Statement {
/**
* A function that takes the accumulator and a data element and returns the new value of the accumulator.
*
* @param
* The type of each result element
* @param
* The accumulator type.
*/
public static interface Reducer extends BiFunction {
}
/**
* Execute this statement asynchronously reducing the set of elements using the given accumulator.
*
* @param identity
* the initial element passed to the accumulating function
* @param accumulator
* the function which accepts a pair (element, accumulator value) for every element in the result
* @param
* identity type
* @return a future which is completed with the accumulator value after all elements have been processed
*/
CompletableFuture executeAsync(R identity, Reducer accumulator);
}