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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.Function;
import javax.annotation.concurrent.Immutable;
/**
* The actual point value for a {@link Point}.
*
* <p>Currently there are three types of {@link Value}:
*
* <ul>
* <li>{@code double}
* <li>{@code long}
* <li>{@link Distribution}
* </ul>
*
* <p>Each {@link Point} contains exactly one of the three {@link Value} types.
*
* @since 0.17
*/
@ExperimentalApi
@Immutable
public abstract class Value {
Value() {}
/**
* Returns a double {@link Value}.
*
* @param value value in double.
* @return a double {@code Value}.
* @since 0.17
*/
public static Value doubleValue(double value) {
return ValueDouble.create(value);
}
/**
* Returns a long {@link Value}.
*
* @param value value in long.
* @return a long {@code Value}.
* @since 0.17
*/
public static Value longValue(long value) {
return ValueLong.create(value);
}
/**
* Returns a {@link Distribution} {@link Value}.
*
* @param value value in {@link Distribution}.
* @return a {@code Distribution} {@code Value}.
* @since 0.17
*/
public static Value distributionValue(Distribution value) {
return ValueDistribution.create(value);
}
/**
* Applies the given match function to the underlying data type.
*
* @since 0.17
*/
public abstract <T> T match(
Function<? super Double, T> doubleFunction,
Function<? super Long, T> longFunction,
Function<? super Distribution, T> distributionFunction,
Function<? super Value, T> defaultFunction);
/** A 64-bit double-precision floating-point {@link Value}. */
@AutoValue
@Immutable
abstract static class ValueDouble extends Value {
ValueDouble() {}
@Override
public final <T> T match(
Function<? super Double, T> doubleFunction,
Function<? super Long, T> longFunction,
Function<? super Distribution, T> distributionFunction,
Function<? super Value, T> defaultFunction) {
return doubleFunction.apply(getValue());
}
/**
* Creates a {@link ValueDouble}.
*
* @param value the value in double.
* @return a {@code ValueDouble}.
*/
static ValueDouble create(double value) {
return new AutoValue_Value_ValueDouble(value);
}
/**
* Returns the double value.
*
* @return the double value.
*/
abstract double getValue();
}
/** A 64-bit integer {@link Value}. */
@AutoValue
@Immutable
abstract static class ValueLong extends Value {
ValueLong() {}
@Override
public final <T> T match(
Function<? super Double, T> doubleFunction,
Function<? super Long, T> longFunction,
Function<? super Distribution, T> distributionFunction,
Function<? super Value, T> defaultFunction) {
return longFunction.apply(getValue());
}
/**
* Creates a {@link ValueLong}.
*
* @param value the value in long.
* @return a {@code ValueLong}.
*/
static ValueLong create(long value) {
return new AutoValue_Value_ValueLong(value);
}
/**
* Returns the long value.
*
* @return the long value.
*/
abstract long getValue();
}
/**
* {@link ValueDistribution} contains summary statistics for a population of values. It optionally
* contains a histogram representing the distribution of those values across a set of buckets.
*/
@AutoValue
@Immutable
abstract static class ValueDistribution extends Value {
ValueDistribution() {}
@Override
public final <T> T match(
Function<? super Double, T> doubleFunction,
Function<? super Long, T> longFunction,
Function<? super Distribution, T> distributionFunction,
Function<? super Value, T> defaultFunction) {
return distributionFunction.apply(getValue());
}
/**
* Creates a {@link ValueDistribution}.
*
* @param value the {@link Distribution} value.
* @return a {@code ValueDistribution}.
*/
static ValueDistribution create(Distribution value) {
return new AutoValue_Value_ValueDistribution(value);
}
/**
* Returns the {@link Distribution} value.
*
* @return the {@code Distribution} value.
*/
abstract Distribution getValue();
}
// TODO(songya): Add support for Summary type.
// This is an aggregation that produces percentiles directly.
}
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