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Metrics output, either Prometheus format, or JSON

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/*
 * Copyright (c) 2022, 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.ArrayList;
import java.util.List;
import java.util.function.BiConsumer;

import io.helidon.webserver.http.ServerRequest;
import io.helidon.webserver.http.ServerResponse;

class PostRequestMetricsSupportImpl implements PostRequestMetricsSupport {

    static PostRequestMetricsSupportImpl create() {
        return new PostRequestMetricsSupportImpl();
    }

    private final List> tasks = new ArrayList<>();

    private PostRequestMetricsSupportImpl() {
    }

    @Override
    public void registerPostRequestWork(BiConsumer task) {
        tasks.add(task);
    }

    @Override
    public void runTasks(ServerRequest request, ServerResponse response, Throwable throwable) {
        Exception e = request.context().get("unmappedException", Exception.class).orElse(null);
        tasks.forEach(t -> t.accept(response, e != null ? e : throwable));
    }
}