/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.bookkeeper.mledger.util;

import java.time.Clock;
import java.time.Instant;
import java.time.ZoneId;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;

public class MockClock extends Clock {
    private Instant initialInstant = Clock.systemUTC().instant();
    private AtomicLong delta = new AtomicLong(0);

    public void advance(long period, TimeUnit unit) {
        delta.addAndGet(unit.toNanos(period));
    }

    @Override
    public Instant instant() {
        return initialInstant.plusNanos(delta.get());
    }

    @Override
    public Clock withZone(ZoneId zone) {
        return this;
    }

    @Override
    public ZoneId getZone() {
        return ZoneId.systemDefault();
    }
}

