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Access to the Neo4j graph database through Java

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * 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 org.neo4j.driver.internal.util;

/**
 * Since {@link java.time.Clock} is only available in Java 8, use our own until we drop java 7 support.
 */
public interface Clock {
    /** Current time, in milliseconds. */
    long millis();

    void sleep(long millis) throws InterruptedException;

    Clock SYSTEM = new Clock() {
        @Override
        public long millis() {
            return System.currentTimeMillis();
        }

        @Override
        public void sleep(long millis) throws InterruptedException {
            Thread.sleep(millis);
        }
    };
}