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Neo4j Graph Data Science :: GDS Cypher Aggregation

There is a newer version: 2.13.2

/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.gds.projection;

import org.neo4j.annotations.service.ServiceProvider;
import org.neo4j.gds.compat.Neo4jProxy;
import org.neo4j.internal.kernel.api.exceptions.ProcedureException;
import org.neo4j.kernel.api.procedure.GlobalProcedures;
import org.neo4j.kernel.extension.ExtensionFactory;
import org.neo4j.kernel.extension.ExtensionType;
import org.neo4j.kernel.extension.context.ExtensionContext;
import org.neo4j.kernel.lifecycle.Lifecycle;
import org.neo4j.kernel.lifecycle.LifecycleAdapter;
import org.neo4j.logging.internal.LogService;

import static org.neo4j.gds.utils.StringFormatting.formatWithLocale;

@ServiceProvider
public final class CypherAggregationExtension extends ExtensionFactory {

    @SuppressWarnings("unused - entry point for service loader")
    public CypherAggregationExtension() {
        super(ExtensionType.GLOBAL, "gds.graph.project.cypher-next");
    }

    @Override
    public Lifecycle newInstance(ExtensionContext context, CypherAggregationExtension.Dependencies dependencies) {
        return LifecycleAdapter.onInit(() -> {
            try {
                var registry = dependencies.globalProceduresRegistry();
                registry.register(Neo4jProxy.callableUserAggregationFunction(CypherAggregation.newInstance()));
                registry.register(Neo4jProxy.callableUserAggregationFunction(AlphaCypherAggregation.newInstance()));
            } catch (ProcedureException e) {
                var log = Neo4jProxy.getInternalLog(dependencies.logService(), getClass());
                log.warn(formatWithLocale("`%s` is not available", CypherAggregation.FUNCTION_NAME), e);
            }
        });
    }

    interface Dependencies {
        GlobalProcedures globalProceduresRegistry();

        LogService logService();
    }
}