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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.metrics;

import org.neo4j.driver.Metrics;
import org.neo4j.driver.exceptions.ClientException;

public enum DevNullMetricsProvider implements MetricsProvider {
    INSTANCE;

    @Override
    public Metrics metrics() {
        // To outside users, we forbid access to the metrics API
        throw new ClientException(
                "Driver metrics are not enabled. You need to enable driver metrics in driver configuration in order to access them.");
    }

    @Override
    public MetricsListener metricsListener() {
        // Internally we can still register callbacks to this empty metrics listener.
        return DevNullMetricsListener.INSTANCE;
    }
}