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Publishes Micrometer meters in OTLP format

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/*
 * Copyright 2022 VMware, Inc.
 *
 * 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
 *
 * https://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.micrometer.registry.otlp;

import io.micrometer.core.instrument.Clock;
import io.micrometer.core.instrument.cumulative.CumulativeFunctionTimer;

import java.util.concurrent.TimeUnit;
import java.util.function.ToDoubleFunction;
import java.util.function.ToLongFunction;

class OtlpCumulativeFunctionTimer extends CumulativeFunctionTimer implements StartTimeAwareMeter {

    private final long startTimeNanos;

    OtlpCumulativeFunctionTimer(Id id, T obj, ToLongFunction countFunction, ToDoubleFunction totalTimeFunction,
            TimeUnit totalTimeFunctionUnit, TimeUnit baseTimeUnit, Clock clock) {
        super(id, obj, countFunction, totalTimeFunction, totalTimeFunctionUnit, baseTimeUnit);
        this.startTimeNanos = TimeUnit.MILLISECONDS.toNanos(clock.wallTime());
    }

    @Override
    public long getStartTimeNanos() {
        return this.startTimeNanos;
    }

}