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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 com.google.common.util.concurrent.AbstractIdleService;

import java.util.List;

/**
 * NoopJournal is used when disk journalling is turned off. In order to avoid propagating the knowledge about whether
 * journalling is happening or not, we inject a no-op journal.
 * Any use of this journal will throw an IllegalStateException.
 */
public class NoopJournal extends AbstractIdleService implements Journal {

    @Override
    public Entry createEntry(byte[] idBytes, byte[] messageBytes) {
        return new Entry(idBytes, messageBytes);
    }

    @Override
    public long write(List entries) {
        throw new IllegalStateException("Invalid use of NoopJournal. Writing to this journal is always a programming error.");
    }

    @Override
    public long write(byte[] idBytes, byte[] messageBytes) {
        throw new IllegalStateException("Invalid use of NoopJournal. Writing to this journal is always a programming error.");
    }

    @Override
    public List read(long maximumCount) {
        throw new IllegalStateException("Invalid use of NoopJournal. Reading from this journal is always a programming error.");
    }

    @Override
    public void markJournalOffsetCommitted(long offset) {
        // nothing to do
    }

    @Override
    protected void startUp() throws Exception {
        // nothing to do
    }

    @Override
    protected void shutDown() throws Exception {
        // nothing to do
    }

    @Override
    public void flush() {
        // nothing to do
    }
}