/*
* Copyright 2017 the original author or 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 org.springframework.cloud.stream.metrics.config;
import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import org.springframework.boot.actuate.metrics.Metric;
import org.springframework.boot.jackson.JsonComponent;
/**
* @author Vinicius Carvalho
* @author Oleg Zhurakousky
*/
@JsonComponent
public class MetricJsonSerializer {
private static final BlockingQueue<DateFormat> formatters = new LinkedBlockingQueue<DateFormat>();
public static class Serializer extends JsonSerializer<Metric<?>> {
@Override
public void serialize(Metric<?> metric, JsonGenerator json,
SerializerProvider serializerProvider) throws IOException {
json.writeStartObject();
json.writeStringField("name", metric.getName());
json.writeNumberField("value", metric.getValue().doubleValue());
DateFormat df = formatters.poll();
if (df == null) {
df = defaultDateFormat();
}
try {
json.writeStringField("timestamp", df.format(metric.getTimestamp()));
json.writeEndObject();
}
finally {
formatters.offer(df);
}
}
}
public static class Deserializer extends JsonDeserializer<Metric<?>> {
@Override
public Metric<?> deserialize(JsonParser p, DeserializationContext ctxt)
throws IOException, JsonProcessingException {
JsonNode node = p.getCodec().readTree(p);
String name = node.get("name").asText();
Number value = node.get("value").asDouble();
Date timestamp = null;
DateFormat df = formatters.poll();
if (df == null) {
df = defaultDateFormat();
}
try {
timestamp = df.parse(node.get("timestamp").asText());
}
catch (ParseException e) {
// ignore timestamp parsing errors
}
finally {
formatters.offer(df);
}
Metric<Number> metric = new Metric<>(name, value, timestamp);
return metric;
}
}
private static DateFormat defaultDateFormat() {
DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSX");
df.setTimeZone(TimeZone.getTimeZone("GMT"));
return df;
}
}