diff options
Diffstat (limited to 'api/src/main/java/io/opencensus/metrics/TimeSeries.java')
-rw-r--r-- | api/src/main/java/io/opencensus/metrics/TimeSeries.java | 50 |
1 files changed, 48 insertions, 2 deletions
diff --git a/api/src/main/java/io/opencensus/metrics/TimeSeries.java b/api/src/main/java/io/opencensus/metrics/TimeSeries.java index bbbfe0e4..c62b6b72 100644 --- a/api/src/main/java/io/opencensus/metrics/TimeSeries.java +++ b/api/src/main/java/io/opencensus/metrics/TimeSeries.java @@ -16,16 +16,52 @@ 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.Nullable; import javax.annotation.concurrent.Immutable; -/** A collection of data points that describes the time-varying values of a {@code Metric}. */ +/** + * A collection of data points that describes the time-varying values of a {@code Metric}. + * + * @since 0.16 + */ +@ExperimentalApi @Immutable -abstract class TimeSeries { +@AutoValue +public abstract class TimeSeries { TimeSeries() {} /** + * Creates a {@link TimeSeries}. + * + * @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 TimeSeries}. Must be non-null + * for cumulative {@code Point}s. + * @return a {@code TimeSeries}. + * @since 0.16 + */ + public static TimeSeries create( + List<LabelValue> labelValues, List<Point> points, @Nullable 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_TimeSeries( + Collections.unmodifiableList(new ArrayList<LabelValue>(labelValues)), + Collections.unmodifiableList(new ArrayList<Point>(points)), + startTimestamp); + } + + /** * Returns the set of {@link LabelValue}s that uniquely identify this {@link TimeSeries}. * * <p>Apply to all {@link Point}s. @@ -45,4 +81,14 @@ abstract class TimeSeries { * @since 0.16 */ public abstract List<Point> getPoints(); + + /** + * Returns the start {@link Timestamp} of this {@link TimeSeries} if the {@link Point}s are + * cumulative, or {@code null} if the {@link Point}s are gauge. + * + * @return the start {@code Timestamp} or {@code null}. + * @since 0.16 + */ + @Nullable + public abstract Timestamp getStartTimestamp(); } |