com.netflix.spectator.atlas.impl.MeasurementSerializer Maven / Gradle / Ivy
/*
* Copyright 2014-2019 Netflix, 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
*
* 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 com.netflix.spectator.atlas.impl;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.netflix.spectator.api.Id;
import com.netflix.spectator.api.Measurement;
import java.io.IOException;
import java.util.function.Function;
/**
* Jackson serializer for measurements. Values will be converted to a
* valid set as they are written out by replacing invalid characters with
* an '_'.
*
* Classes in this package are only intended for use internally within spectator. They may
* change at any time and without notice.
*/
public class MeasurementSerializer extends JsonSerializer {
private final Function fixTagString;
/**
* Create a new instance of the serializer.
*
* @param fixTagString
* Function that fixes characters used for tag keys and values.
*/
public MeasurementSerializer(Function fixTagString) {
super();
this.fixTagString = fixTagString;
}
@Override
public void serialize(
Measurement value,
JsonGenerator gen,
SerializerProvider serializers) throws IOException {
Id id = value.id();
gen.writeStartObject();
gen.writeObjectFieldStart("tags");
gen.writeStringField("name", fixTagString.apply(id.name()));
boolean explicitDsType = false;
int n = id.size();
for (int i = 1; i < n; ++i) {
final String k = fixTagString.apply(id.getKey(i));
final String v = fixTagString.apply(id.getValue(i));
if (!"name".equals(k)) {
if ("atlas.dstype".equals(k)) {
explicitDsType = true;
}
gen.writeStringField(k, v);
}
}
// If the dstype has not been explicitly set, then the value must be coming in
// as a gauge. Go ahead and explicitly mark it as such because the backend will
// default to a rate.
if (!explicitDsType) {
gen.writeStringField("atlas.dstype", "gauge");
}
gen.writeEndObject();
gen.writeNumberField("timestamp", value.timestamp());
gen.writeNumberField("value", value.value());
gen.writeEndObject();
}
}