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There is a newer version: 6.0.1

/*
 * 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.plugin.lookup;

import com.google.common.collect.Multimap;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeInfo;

import java.util.Optional;

@JsonTypeInfo(
        use = JsonTypeInfo.Id.NAME,
        include = JsonTypeInfo.As.PROPERTY,
        property = LookupCacheConfiguration.TYPE_FIELD,
        visible = true,
        defaultImpl = FallbackCacheConfig.class)
public interface LookupCacheConfiguration {
    String TYPE_FIELD = "type";

    @JsonProperty(TYPE_FIELD)
    String type();

    /**
     * Override this method to check for logical errors in the configuration, such as missing
     * files, or invalid combinations of options. Prefer validation annotations for simple
     * per-property validations rules, such as min/max values, non-empty strings etc. 
     *
     *  By default the configuration has no extra validation errors (i.e. the result of this
     * method is {@link Optional#empty()}. 
     *
     * Returning failing validations here does not prevent saving the configuration!
     *
     * @return optionally map of property name to error messages
     */
    @JsonIgnore
    default Optional> validate() {
        return Optional.empty();
    }
}