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/*
 *     Copyright (C) 2015  higherfrequencytrading.com
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License.
 *
 *     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 Lesser General Public License for more details.
 *
 *     You should have received a copy of the GNU Lesser General Public License
 *     along with this program.  If not, see .
 */

package net.openhft.chronicle.hash.replication;

import net.openhft.chronicle.hash.ChronicleHashBuilder;
import net.openhft.chronicle.map.ChronicleMap;
import net.openhft.chronicle.set.ChronicleSet;

import java.io.Serializable;

/**
 * TimeProvider was aims to possibly later provide an optimization to
 * {@link System#currentTimeMillis()} on every call to replicated {@link ChronicleMap}
 * or {@link ChronicleSet}.
 *
 * Subclasses should be immutable, because {@link ChronicleHashBuilder} doesn't make defensive
 * copies.
 *
 * @author Rob Austin.
 * @see ChronicleHashBuilder#timeProvider(TimeProvider)
 */
public abstract class TimeProvider implements Serializable {
    /**
     * Delegates {@link #currentTimeMillis()} to {@link System#currentTimeMillis()}.
     */
    public static final TimeProvider SYSTEM = new System();
    private static final long serialVersionUID = 0L;

    public abstract long currentTimeMillis();

    private static class System extends TimeProvider {
        private static final long serialVersionUID = 0L;

        public long currentTimeMillis() {
            return java.lang.System.currentTimeMillis();
        }

        @Override
        public boolean equals(Object o) {
            return o != null && o.getClass() == getClass();
        }

        @Override
        public int hashCode() {
            return getClass().hashCode();
        }

        @Override
        public String toString() {
            return getClass().getSimpleName();
        }

        private Object readResolve() {
            return SYSTEM;
        }
    }

}