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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;

/**
 * These are used for test to reduce the size of a queue dump when doing a small test.
 */
public enum TestRollCycles implements RollCycle {
    /**
     * 0xffffffff entries - Only good for testing
     */
    TEST_SECONDLY(/*---*/"yyyyMMdd-HHmmss'T'", 1000, MAX_INDEX_COUNT, 4),
    /**
     * 0x1000 entries - Only good for testing
     */
    TEST4_SECONDLY(/*---*/"yyyyMMdd-HHmmss'T4'", 1000, 32, 4),
    /**
     * 0x400 entries per hour - Only good for testing
     */
    TEST_HOURLY(/*-----*/"yyyyMMdd-HH'T'", 60 * 60 * 1000, 16, 4),
    /**
     * 0x40 entries per day - Only good for testing
     */
    TEST_DAILY(/*------*/"yyyyMMdd'T1'", 24 * 60 * 60 * 1000, 8, 1),
    /**
     * 0x200 entries per day - Only good for testing
     */
    TEST2_DAILY(/*-----*/"yyyyMMdd'T2'", 24 * 60 * 60 * 1000, 16, 2),
    /**
     * 0x1000 entries per day - Only good for testing
     */
    TEST4_DAILY(/*-----*/"yyyyMMdd'T4'", 24 * 60 * 60 * 1000, 32, 4),
    /**
     * 0x20000 entries per day - Only good for testing
     */
    TEST8_DAILY(/*-----*/"yyyyMMdd'T8'", 24 * 60 * 60 * 1000, 128, 8),
    ;

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

    TestRollCycles(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);
    }
}