spring NamedContributorsMapAdapter 源码
springboot NamedContributorsMapAdapter 代码
文件路径：/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/health/NamedContributorsMapAdapter.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.health;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.function.Function;
import org.springframework.util.Assert;
/**
* {@link NamedContributors} backed by a map with values adapted as necessary.
*
* @param <V> the value type
* @param <C> the contributor type
* @author Phillip Webb
* @author Guirong Hu
* @see CompositeHealthContributorMapAdapter
* @see CompositeReactiveHealthContributorMapAdapter
*/
abstract class NamedContributorsMapAdapter<V, C> implements NamedContributors<C> {
private final Map<String, C> map;
NamedContributorsMapAdapter(Map<String, V> map, Function<V, ? extends C> valueAdapter) {
Assert.notNull(map, "Map must not be null");
Assert.notNull(valueAdapter, "ValueAdapter must not be null");
map.keySet().forEach(this::validateKey);
this.map = Collections.unmodifiableMap(map.entrySet().stream().collect(LinkedHashMap::new,
(result, entry) -> result.put(entry.getKey(), adapt(entry.getValue(), valueAdapter)), Map::putAll));
}
private void validateKey(String value) {
Assert.notNull(value, "Map must not contain null keys");
Assert.isTrue(!value.contains("/"), "Map keys must not contain a '/'");
}
private C adapt(V value, Function<V, ? extends C> valueAdapter) {
C contributor = (value != null) ? valueAdapter.apply(value) : null;
Assert.notNull(contributor, "Map must not contain null values");
return contributor;
}
@Override
public Iterator<NamedContributor<C>> iterator() {
Iterator<Entry<String, C>> iterator = this.map.entrySet().iterator();
return new Iterator<NamedContributor<C>>() {
@Override
public boolean hasNext() {
return iterator.hasNext();
}
@Override
public NamedContributor<C> next() {
Entry<String, C> entry = iterator.next();
return NamedContributor.of(entry.getKey(), entry.getValue());
}
};
}
@Override
public C getContributor(String name) {
return this.map.get(name);
}
}
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