/
ObservedClientInterceptor.java
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/
ObservedClientInterceptor.java
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/*
* Copyright 2012-2022 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.util.Iterator;
import feign.Client;
import feign.ClientInterceptor;
import feign.ClientInvocationContext;
import feign.FeignException;
import feign.Response;
import io.micrometer.observation.Observation;
import io.micrometer.observation.ObservationRegistry;
/** Warp feign {@link Client} with metrics. */
public class ObservedClientInterceptor implements ClientInterceptor {
private final ObservationRegistry observationRegistry;
private final FeignObservationConvention customFeignObservationConvention;
public ObservedClientInterceptor(ObservationRegistry observationRegistry,
FeignObservationConvention customFeignObservationConvention) {
this.observationRegistry = observationRegistry;
this.customFeignObservationConvention = customFeignObservationConvention;
}
public ObservedClientInterceptor(ObservationRegistry observationRegistry) {
this(observationRegistry, null);
}
@Override
public Response around(ClientInvocationContext context, Iterator<ClientInterceptor> iterator)
throws FeignException {
FeignContext feignContext = new FeignContext(context.getRequestTemplate());
Observation observation = FeignDocumentedObservation.DEFAULT
.observation(this.customFeignObservationConvention,
DefaultFeignObservationConvention.INSTANCE, feignContext, this.observationRegistry)
.start();
Exception ex = null;
Response response = null;
try {
ClientInterceptor interceptor = iterator.next();
response = interceptor.around(context, iterator);
return response;
} catch (FeignException exception) {
ex = exception;
throw exception;
} finally {
feignContext.setResponse(response);
if (ex != null) {
observation.error(ex);
}
observation.stop();
}
}
}