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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.HashMap;
import java.util.Map;
/**
* A {@link Classifier} that maps from String patterns with wildcards to a set
* of values of a given type. An input String is matched with the most specific
* pattern possible to the corresponding value in an input map. A default value
* should be specified with a pattern key of "*".
*
* @author Dave Syer
*
*/
@SuppressWarnings("serial")
public class PatternMatchingClassifier implements Classifier {
private PatternMatcher values;
/**
* Default constructor. Use the setter or the other constructor to create a
* sensible classifier, otherwise all inputs will cause an exception.
*/
public PatternMatchingClassifier() {
this(new HashMap());
}
/**
* Create a classifier from the provided map. The keys are patterns, using
* '?' as a single character and '*' as multi-character wildcard.
*
* @param values the values to use in the {@link PatternMatcher}
*/
public PatternMatchingClassifier(Map values) {
super();
this.values = new PatternMatcher(values);
}
/**
* A map from pattern to value
* @param values the pattern map to set
*/
public void setPatternMap(Map values) {
this.values = new PatternMatcher(values);
}
/**
* Classify the input by matching it against the patterns provided in
* {@link #setPatternMap(Map)}. The most specific pattern that matches will
* be used to locate a value.
*
* @return the value matching the most specific pattern possible
*
* @throws IllegalStateException if no matching value is found.
*/
public T classify(String classifiable) {
T value = values.match(classifiable);
return value;
}
}