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The Java operations layer for the MongoDB Java Driver. Third parties can ' + 'wrap this layer to provide custom higher-level APIs

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/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * 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.mongodb.internal.connection;

/**
 * To enable unit testing of classes that rely on System.nanoTime
 *
 * This class is not part of the public API and may be removed or changed at any time
 */
public final class Time {
    static final long CONSTANT_TIME = 42;

    private static boolean isConstant;

    public static void makeTimeConstant() {
        isConstant = true;
    }

    public static void makeTimeMove() {
        isConstant = false;
    }

    public static long nanoTime() {
        return isConstant ? CONSTANT_TIME : System.nanoTime();
    }

    private Time() {
    }
}