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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * 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
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog2.shared.journal;

import java.util.List;

public interface Journal {
    Entry createEntry(byte[] idBytes, byte[] messageBytes);

    long write(List entries);

    long write(byte[] idBytes, byte[] messageBytes);

    List read(long maximumCount);

    void markJournalOffsetCommitted(long offset);

    void flush();

    class Entry {
        private final byte[] idBytes;
        private final byte[] messageBytes;

        public Entry(byte[] idBytes, byte[] messageBytes) {
            this.idBytes = idBytes;
            this.messageBytes = messageBytes;
        }

        public byte[] getIdBytes() {
            return idBytes;
        }

        public byte[] getMessageBytes() {
            return messageBytes;
        }
    }

    class JournalReadEntry {

        private final byte[] payload;
        private final long offset;

        public JournalReadEntry(byte[] payload, long offset) {
            this.payload = payload;
            this.offset = offset;
        }

        public long getOffset() {
            return offset;
        }

        public byte[] getPayload() {
            return payload;
        }
    }
}