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Metrics output, either Prometheus format, or JSON

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/*
 * Copyright (c) 2023 Oracle and/or its affiliates.
 *
 * 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 io.helidon.webserver.observe.metrics;

import java.util.Optional;

import io.helidon.common.media.type.MediaType;
import io.helidon.common.media.type.MediaTypes;
import io.helidon.metrics.api.MeterRegistry;
import io.helidon.metrics.api.MeterRegistryFormatter;
import io.helidon.metrics.api.MetricsConfig;
import io.helidon.metrics.spi.MeterRegistryFormatterProvider;

/**
 * JSON formatter provider.
 */
public class JsonMeterRegistryFormatterProvider implements MeterRegistryFormatterProvider {

    /**
     * Creates a new instance for service loading.
     */
    public JsonMeterRegistryFormatterProvider() {
    }

    @Override
    public Optional formatter(MediaType mediaType,
                                                      MetricsConfig metricsConfig,
                                                      MeterRegistry meterRegistry,
                                                      Optional scopeTagName,
                                                      Iterable scopeSelection,
                                                      Iterable nameSelection) {
        return mediaType.type().equals(MediaTypes.APPLICATION_JSON.type())
                && mediaType.subtype().equals(MediaTypes.APPLICATION_JSON.subtype())
                ? Optional.of(create(metricsConfig,
                                     meterRegistry,
                                     scopeTagName,
                                     scopeSelection,
                                     nameSelection))
                : Optional.empty();
    }

    private JsonFormatter create(MetricsConfig metricsConfig,
                                 MeterRegistry meterRegistry,
                                 Optional scopeTagName,
                                 Iterable scopeSelection,
                                 Iterable nameSelection) {
        JsonFormatter.Builder builder = JsonFormatter.builder(metricsConfig, meterRegistry)
                .scopeSelection(scopeSelection)
                .meterNameSelection(nameSelection);
        scopeTagName.ifPresent(builder::scopeTagName);
        return builder.build();
    }
}