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/*
* Copyright (c) 2024, 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package compiler.lib.generators;
/**
* Defines the underlying randomness source used by the generators. This is essentially a subset of
* {@link java.util.random.RandomGenerator} and the present methods have the same contract.
* This interface greatly benefits testing, as it is much easier to implement than
* {@link java.util.random.RandomGenerator} and thus makes creating test doubles more convenient.
*/
public interface RandomnessSource {
/** Samples the next long value uniformly at random. */
long nextLong();
/** Samples the next long value in the half-open interval [lo, hi) uniformly at random. */
long nextLong(long lo, long hi);
/** Samples the next int value uniformly at random. */
int nextInt();
/** Samples the next int value in the half-open interval [lo, hi) uniformly at random. */
int nextInt(int lo, int hi);
/** Samples the next double value in the half-open interval [lo, hi) uniformly at random. */
double nextDouble(double lo, double hi);
/** Samples the next float value in the half-open interval [lo, hi) uniformly at random. */
float nextFloat(float lo, float hi);
/** Samples the next float16 value in the half-open interval [lo, hi) uniformly at random. */
short nextFloat16(short lo, short hi);
}
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