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Resilience4j is a lightweight, easy-to-use fault tolerance library designed for Java8 and functional programming

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/*
 * Copyright 2019 Kyuhyen Hwang
 *
 * 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 io.github.resilience4j.fallback;

import io.github.resilience4j.timelimiter.configure.IllegalReturnTypeException;
import io.vavr.CheckedFunction0;

/**
 * default fallbackMethod decorator. it catches throwable and invoke the fallbackMethod method.
 */
public class DefaultFallbackDecorator implements FallbackDecorator {

    @Override
    public boolean supports(Class target) {
        return true;
    }

    @Override
    public CheckedFunction0 decorate(FallbackMethod fallbackMethod,
        CheckedFunction0 supplier) {
        return () -> {
            try {
                return supplier.apply();
            } catch (IllegalReturnTypeException e) {
                throw e;
            } catch (Throwable throwable) {
                return fallbackMethod.fallback(throwable);
            }
        };
    }
}