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Access to the Neo4j graph database through Java

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.neo4j.driver.internal.svm;

import com.oracle.svm.core.annotate.Substitute;
import com.oracle.svm.core.annotate.TargetClass;

import org.neo4j.driver.Config;
import org.neo4j.driver.MetricsAdapter;
import org.neo4j.driver.internal.DriverFactory;
import org.neo4j.driver.internal.metrics.DevNullMetricsProvider;
import org.neo4j.driver.internal.metrics.InternalMetricsProvider;
import org.neo4j.driver.internal.metrics.MetricsProvider;
import org.neo4j.driver.internal.metrics.MicrometerMetricsProvider;
import org.neo4j.driver.internal.util.Clock;

@TargetClass( DriverFactory.class )
final class Target_org_neo4j_driver_internal_DriverFactory
{

    /**
     * Substitutes metrics adatper in such a way that it falls back to off when Micrometer is not available.
     *
     * @param config Drivers config
     * @param clock Clock to use
     * @return A metrics provider, never null
     */
    @Substitute
    protected static MetricsProvider getOrCreateMetricsProvider( Config config, Clock clock )
    {
        MetricsAdapter metricsAdapter = config.metricsAdapter();
        if ( metricsAdapter == null )
        {
            metricsAdapter = config.isMetricsEnabled() ? MetricsAdapter.DEFAULT : MetricsAdapter.DEV_NULL;
        }
        switch ( metricsAdapter )
        {
        case DEV_NULL:
            return DevNullMetricsProvider.INSTANCE;
        case DEFAULT:
            return new InternalMetricsProvider( clock, config.logging() );
        case MICROMETER:
            try
            {
                @SuppressWarnings( "unused" ) Class metricsClass = Class.forName( "io.micrometer.core.instrument.Metrics" );
                return MicrometerMetricsProvider.forGlobalRegistry();
            }
            catch ( ClassNotFoundException e )
            {
                return DevNullMetricsProvider.INSTANCE;
            }
        }
        throw new IllegalStateException( "Unknown or unsupported MetricsAdapter: " + metricsAdapter );
    }
}

class MicrometerSubstitutions
{
}