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/**
* Copyright 2012-2020 The Feign 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 feign.micrometer;
import java.lang.reflect.Type;
import feign.RequestTemplate;
import feign.codec.EncodeException;
import feign.codec.Encoder;
import io.micrometer.core.instrument.MeterRegistry;
/**
* Warp feign {@link Encoder} with metrics.
*/
public class MeteredEncoder implements Encoder {
private final Encoder encoder;
private final MeterRegistry meterRegistry;
private final FeignMetricName metricName;
public MeteredEncoder(Encoder encoder, MeterRegistry meterRegistry) {
this.encoder = encoder;
this.meterRegistry = meterRegistry;
this.metricName = new FeignMetricName(Encoder.class);
}
@Override
public void encode(Object object, Type bodyType, RequestTemplate template)
throws EncodeException {
meterRegistry.timer(
metricName.name(),
metricName.tag(template.methodMetadata(), template.feignTarget()))
.record(() -> encoder.encode(object, bodyType, template));
if (template.body() != null) {
meterRegistry.summary(
metricName.name("request_size"),
metricName.tag(template.methodMetadata(), template.feignTarget()))
.record(template.body().length);
}
}
}