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/*
* Copyright 2018, OpenCensus Authors
*
* 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.opencensus.metrics;
import com.google.auto.value.AutoValue;
import io.opencensus.common.ExperimentalApi;
import io.opencensus.common.Timestamp;
import io.opencensus.internal.Utils;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.annotation.concurrent.Immutable;
/**
* A collection of data points that describes the time-varying values of a cumulative {@code
* Metric}.
*
* @since 0.16
*/
@ExperimentalApi
@Immutable
@AutoValue
public abstract class TimeSeriesCumulative extends TimeSeries {
TimeSeriesCumulative() {}
/**
* Creates a {@link TimeSeriesCumulative}.
*
* @param labelValues the {@code LabelValue}s that uniquely identify this {@code TimeSeries}.
* @param points the data {@code Point}s of this {@code TimeSeries}.
* @param startTimestamp the start {@code Timestamp} of this {@code TimeSeriesCumulative}.
* @return a {@code TimeSeriesCumulative}.
* @since 0.16
*/
public static TimeSeriesCumulative create(
List<LabelValue> labelValues, List<Point> points, Timestamp startTimestamp) {
// Fail fast on null lists to prevent NullPointerException when copying the lists.
Utils.checkNotNull(labelValues, "labelValues");
Utils.checkNotNull(points, "points");
Utils.checkListElementNotNull(labelValues, "labelValue");
Utils.checkListElementNotNull(points, "point");
return new AutoValue_TimeSeriesCumulative(
Collections.unmodifiableList(new ArrayList<LabelValue>(labelValues)),
Collections.unmodifiableList(new ArrayList<Point>(points)),
startTimestamp);
}
/**
* Returns the start {@link Timestamp} of this {@link TimeSeriesCumulative}.
*
* @return the start {@code Timestamp}.
* @since 0.16
*/
public abstract Timestamp getStartTimestamp();
}
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