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/**
 * Copyright 2013 Netflix, 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.netflix.servo.util;

import java.util.concurrent.atomic.AtomicLong;

/**
 * Mostly for testing, this clock must be explicitly set to a given value. Defaults to init.
 */
public class ManualClock implements Clock {

    private final AtomicLong time;

    /**
     * Construct a new clock setting the current time to {@code init}.
     *
     * @param init Number of milliseconds to use as the initial time.
     */
    public ManualClock(long init) {
        time = new AtomicLong(init);
    }

    /**
     * Update the current time to {@code t}.
     * @param t Number of milliseconds to use for the current time.
     */
    public void set(long t) {
        time.set(t);
    }

    /**
     * {@inheritDoc}
     */
    public long now() {
        return time.get();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        ManualClock clock = (ManualClock) o;
        return now() == clock.now();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int hashCode() {
        return Long.valueOf(now()).hashCode();
    }
}