spring-retry BackToBackPatternClassifier 源码
spring-retry BackToBackPatternClassifier 代码
文件路径：/src/main/java/org/springframework/classify/BackToBackPatternClassifier.java
/*
* Copyright 2006-2022 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.classify;
import java.util.Map;
/**
* A special purpose {@link Classifier} with easy configuration options for mapping from
* one arbitrary type of object to another via a pattern matcher.
*
* @author Dave Syer
* @param <C> the type of thing to classify
* @param <T> the output of the classifier
*
*/
@SuppressWarnings("serial")
public class BackToBackPatternClassifier<C, T> implements Classifier<C, T> {
private Classifier<C, String> router;
private Classifier<String, T> matcher;
/**
* Default constructor, provided as a convenience for people using setter injection.
*/
public BackToBackPatternClassifier() {
}
/**
* Set up a classifier with input to the router and output from the matcher.
* @param router see {@link #setRouterDelegate(Object)}
* @param matcher see {@link #setMatcherMap(Map)}
*/
public BackToBackPatternClassifier(Classifier<C, String> router, Classifier<String, T> matcher) {
super();
this.router = router;
this.matcher = matcher;
}
/**
* A convenience method for creating a pattern matching classifier for the matcher
* component.
* @param map maps pattern keys with wildcards to output values
*/
public void setMatcherMap(Map<String, T> map) {
this.matcher = new PatternMatchingClassifier<>(map);
}
/**
* A convenience method of creating a router classifier based on a plain old Java
* Object. The object provided must have precisely one public method that either has
* the <code>@Classifier</code> annotation or accepts a single argument and outputs a
* String. This will be used to create an input classifier for the router component.
* @param delegate the delegate object used to create a router classifier
*/
public void setRouterDelegate(Object delegate) {
this.router = new ClassifierAdapter<>(delegate);
}
/**
* Classify the input and map to a String, then take that and put it into a pattern
* matcher to match to an output value.
*/
@Override
public T classify(C classifiable) {
return this.matcher.classify(this.router.classify(classifiable));
}
}
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