/*
 * 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.cassandra.service.accord.api;

import java.util.concurrent.TimeUnit;

import accord.local.TimeService;

import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.utils.FBUtilities;

import static java.util.concurrent.TimeUnit.NANOSECONDS;
import static org.apache.cassandra.utils.Clock.Global.currentTimeMicros;
import static org.apache.cassandra.utils.Clock.Global.nanoTime;

public class AccordTimeService implements TimeService
{
    private static final boolean PRECISE_MICROS;
    static
    {
        Boolean precise = DatabaseDescriptor.getAccord().precise_micros;
        PRECISE_MICROS = precise == null || precise;
    }

    @Override
    public long now()
    {
        return nowMicros();
    }

    public static long nowMicros()
    {
        return PRECISE_MICROS ? currentTimeMicros() : FBUtilities.timestampMicros();
    }

    @Override
    public long elapsed(TimeUnit unit)
    {
        return unit.convert(nanoTime(), NANOSECONDS);
    }
}
