/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.test;

import java.util.concurrent.TimeUnit;
import org.eclipse.collections.api.map.primitive.MutableLongLongMap;
import org.eclipse.collections.impl.map.mutable.primitive.LongLongHashMap;
import org.neo4j.resources.CpuClock;

public class FakeCpuClock implements CpuClock {
    public static final CpuClock NOT_AVAILABLE = threadId -> -1;
    private final MutableLongLongMap cpuTimes = new LongLongHashMap();

    @Override
    public long cpuTimeNanos(long threadId) {
        return Math.max(0, cpuTimes.get(threadId));
    }

    public FakeCpuClock add(long delta, TimeUnit unit) {
        return add(unit.toNanos(delta));
    }

    public FakeCpuClock add(long nanos) {
        return add(Thread.currentThread().getId(), nanos);
    }

    public FakeCpuClock add(long threadId, long nanos) {
        cpuTimes.put(threadId, cpuTimeNanos(threadId) + nanos);
        return this;
    }
}
