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Spring Retry provides an abstraction around retrying failed operations, with an emphasis on declarative control of the process and policy-based bahaviour that is easy to extend and customize. For instance, you can configure a plain POJO operation to retry if it fails, based on the type of exception, and with a fixed or exponential backoff.
/*
* Copyright 2006-2007 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
*
* 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 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
*
*/
@SuppressWarnings("serial")
public class BackToBackPatternClassifier implements Classifier {
private Classifier router;
private Classifier 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 router, Classifier 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 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 @Classifier
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.
*/
public T classify(C classifiable) {
return matcher.classify(router.classify(classifiable));
}
}