spring TracingObservationHandlerGrouping 源码
springboot TracingObservationHandlerGrouping 代码
文件路径：/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/observation/TracingObservationHandlerGrouping.java
/*
* Copyright 2012-2022 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
*
* https://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.boot.actuate.autoconfigure.observation;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import io.micrometer.core.instrument.observation.MeterObservationHandler;
import io.micrometer.observation.ObservationHandler;
import io.micrometer.observation.ObservationHandler.FirstMatchingCompositeObservationHandler;
import io.micrometer.observation.ObservationRegistry.ObservationConfig;
import io.micrometer.tracing.handler.TracingObservationHandler;
/**
* {@link ObservationHandlerGrouping} used by {@link ObservationAutoConfiguration} if
* micrometer-tracing is on the classpath.
*
* Groups all {@link MeterObservationHandler} into a
* {@link FirstMatchingCompositeObservationHandler}, and all
* {@link TracingObservationHandler} into a
* {@link FirstMatchingCompositeObservationHandler}. All other handlers are added to the
* {@link ObservationConfig} directly.
*
* @author Moritz Halbritter
*/
class TracingObservationHandlerGrouping implements ObservationHandlerGrouping {
@Override
public void apply(Collection<ObservationHandler<?>> handlers, ObservationConfig config) {
List<ObservationHandler<?>> meterObservationHandlers = new ArrayList<>();
List<ObservationHandler<?>> tracingObservationHandlers = new ArrayList<>();
for (ObservationHandler<?> handler : handlers) {
if (handler instanceof MeterObservationHandler<?>) {
meterObservationHandlers.add(handler);
}
else if (handler instanceof TracingObservationHandler<?>) {
tracingObservationHandlers.add(handler);
}
else {
config.observationHandler(handler);
}
}
if (!meterObservationHandlers.isEmpty()) {
config.observationHandler(new FirstMatchingCompositeObservationHandler(meterObservationHandlers));
}
if (!tracingObservationHandlers.isEmpty()) {
config.observationHandler(new FirstMatchingCompositeObservationHandler(tracingObservationHandlers));
}
}
}
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