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Spring Boot Actuator AutoConfigure
/*
* Copyright 2012-2023 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.tracing;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import brave.baggage.BaggagePropagation;
import brave.baggage.BaggagePropagationConfig;
import brave.baggage.BaggagePropagationConfig.SingleBaggageField;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
/**
* Local baggage fields.
*
* @author Moritz Halbritter
*/
class LocalBaggageFields {
private final List fields;
LocalBaggageFields(List fields) {
Assert.notNull(fields, "fields must not be null");
this.fields = fields;
}
/**
* Returns the local fields as a list.
* @return the list
*/
List asList() {
return Collections.unmodifiableList(this.fields);
}
/**
* Extracts the local fields from the given propagation factory builder.
* @param builder the propagation factory builder to extract the local fields from
* @return the local fields
*/
static LocalBaggageFields extractFrom(BaggagePropagation.FactoryBuilder builder) {
List localFields = new ArrayList<>();
for (BaggagePropagationConfig config : builder.configs()) {
if (config instanceof SingleBaggageField field) {
if (CollectionUtils.isEmpty(field.keyNames())) {
localFields.add(field.field().name());
}
}
}
return new LocalBaggageFields(localFields);
}
/**
* Creates empty local fields.
* @return the empty local fields
*/
static LocalBaggageFields empty() {
return new LocalBaggageFields(Collections.emptyList());
}
}