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Application monitoring instrumentation facade

There is a newer version: 1.13.2

/**
 * Copyright 2017 Pivotal Software, 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 io.micrometer.core.instrument;

import io.micrometer.core.instrument.util.TimeUtils;

import java.time.Duration;
import java.util.concurrent.TimeUnit;

public class MockClock implements Clock {
    // has to be non-zero to prevent divide-by-zeroes and other weird math results based on the clock
    private long timeNanos = (long) TimeUtils.millisToUnit(1, TimeUnit.NANOSECONDS);

    @Override
    public long monotonicTime() {
        return timeNanos;
    }

    @Override
    public long wallTime() {
        return TimeUnit.MILLISECONDS.convert(timeNanos, TimeUnit.NANOSECONDS);
    }

    public long add(long amount, TimeUnit unit) {
        timeNanos += unit.toNanos(amount);
        return timeNanos;
    }

    public long add(Duration duration) {
        return add(duration.toNanos(), TimeUnit.NANOSECONDS);
    }

    public long addSeconds(long amount) {
        return add(amount, TimeUnit.SECONDS);
    }

    public static MockClock clock(MeterRegistry registry) {
        return (MockClock) registry.config().clock();
    }
}