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Java library for persisted low latency messaging (Java 8+)

There is a newer version: 5.27ea0

package net.openhft.chronicle.queue.rollcycles;

import net.openhft.chronicle.queue.RollCycle;

/**
 * Old RollCycle definitions kept for historical reasons
 */
public enum LegacyRollCycles implements RollCycle {
    /**
     * 0x4000000 entries per minute, indexing every 16th entry
     */
    MINUTELY(/*--------*/"yyyyMMdd-HHmm", 60 * 1000, 2 << 10, 16),
    /**
     * 0x10000000 entries per hour, indexing every 16th entry, leave as 4K and 16 for historical reasons.
     */
    HOURLY(/*----------*/"yyyyMMdd-HH", 60 * 60 * 1000, 4 << 10, 16),
    /**
     * 0xffffffff entries per day, indexing every 64th entry, leave as 8K and 64 for historical reasons.
     */
    DAILY(/*-----------*/"yyyyMMdd", 24 * 60 * 60 * 1000, 8 << 10, 64),
    ;

    private final String format;
    private final int lengthInMillis;
    private final RollCycleArithmetic arithmetic;

    LegacyRollCycles(String format, int lengthInMillis, int indexCount, int indexSpacing) {
        this.format = format;
        this.lengthInMillis = lengthInMillis;
        this.arithmetic = RollCycleArithmetic.of(indexCount, indexSpacing);
    }

    public long maxMessagesPerCycle() {
        return arithmetic.maxMessagesPerCycle();
    }

    @Override
    public String format() {
        return this.format;
    }

    @Override
    public int lengthInMillis() {
        return this.lengthInMillis;
    }

    /**
     * @return this is the size of each index array, note: indexCount^2 is the maximum number of index queue entries.
     */
    @Override
    public int defaultIndexCount() {
        return arithmetic.indexCount();
    }

    @Override
    public int defaultIndexSpacing() {
        return arithmetic.indexSpacing();
    }

    @Override
    public long toIndex(int cycle, long sequenceNumber) {
        return arithmetic.toIndex(cycle, sequenceNumber);
    }

    @Override
    public long toSequenceNumber(long index) {
        return arithmetic.toSequenceNumber(index);
    }

    @Override
    public int toCycle(long index) {
        return arithmetic.toCycle(index);
    }
}