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There is a newer version: 6.1.4
/*
 * 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.messageq;

import com.google.inject.Scopes;
import org.graylog2.Configuration;
import org.graylog2.plugin.PluginModule;
import org.graylog2.shared.journal.Journal;
import org.graylog2.shared.journal.LocalKafkaJournal;
import org.graylog2.shared.journal.LocalKafkaJournalModule;
import org.graylog2.shared.journal.NoopJournal;
import org.graylog2.shared.messageq.localkafka.LocalKafkaMessageQueueAcknowledger;
import org.graylog2.shared.messageq.localkafka.LocalKafkaMessageQueueReader;
import org.graylog2.shared.messageq.localkafka.LocalKafkaMessageQueueWriter;
import org.graylog2.shared.messageq.noop.NoopMessageQueueAcknowledger;
import org.graylog2.shared.messageq.noop.NoopMessageQueueReader;
import org.graylog2.shared.messageq.noop.NoopMessageQueueWriter;

public class MessageQueueModule extends PluginModule {
    public static final String DISK_JOURNAL_MODE = "disk";
    public static final String NOOP_JOURNAL_MODE = "noop";

    private final Configuration configuration;

    public MessageQueueModule(Configuration configuration) {
        this.configuration = configuration;
    }

    @Override
    protected void configure() {
        switch (configuration.getMessageJournalMode()) {
            case NOOP_JOURNAL_MODE:
                bindMessageQueueImplementation(NoopMessageQueueReader.class, NoopMessageQueueWriter.class,
                        NoopMessageQueueAcknowledger.class);
                break;
            case DISK_JOURNAL_MODE:
                bindMessageQueueImplementation(LocalKafkaMessageQueueReader.class, LocalKafkaMessageQueueWriter.class,
                        LocalKafkaMessageQueueAcknowledger.class);
                break;
            default:
                // OK, none of the journal modes covered by this plugin are activated
                break;
        }

        if (configuration.getMessageJournalMode().equals(DISK_JOURNAL_MODE)) {
            install(new LocalKafkaJournalModule());
            serviceBinder().addBinding().to(LocalKafkaJournal.class).in(Scopes.SINGLETON);
        } else {
            binder().bind(Journal.class).to(NoopJournal.class).in(Scopes.SINGLETON);
            serviceBinder().addBinding().to(NoopJournal.class).in(Scopes.SINGLETON);
        }

        bind(MessageQueueReader.Metrics.class).toProvider(MessageQueueReader.Metrics.Provider.class)
                .in(Scopes.SINGLETON);
        bind(MessageQueueWriter.Metrics.class).toProvider(MessageQueueWriter.Metrics.Provider.class)
                .in(Scopes.SINGLETON);
        bind(MessageQueueAcknowledger.Metrics.class).toProvider(MessageQueueAcknowledger.Metrics.Provider.class)
                .in(Scopes.SINGLETON);
    }
}