com.github.ljtfreitas.restify.spring.netflix.autoconfigure.hystrix.HystrixFallbackBeanFactory.java Source code

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Here is the source code for com.github.ljtfreitas.restify.spring.netflix.autoconfigure.hystrix.HystrixFallbackBeanFactory.java

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/*******************************************************************************
 *
 * MIT License
 *
 * Copyright (c) 2016 Tiago de Freitas Lima
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 *******************************************************************************/
package com.github.ljtfreitas.restify.spring.netflix.autoconfigure.hystrix;

import java.util.HashMap;
import java.util.Map;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.annotation.BeanFactoryAnnotationUtils;

class HystrixFallbackBeanFactory {

    static final String QUALIFIER_NAME = "fallback";

    private static final Map<Class<?>, Object> cache = new HashMap<>();

    private final BeanFactory beanFactory;

    public HystrixFallbackBeanFactory(BeanFactory beanFactory) {
        this.beanFactory = beanFactory;
    }

    @SuppressWarnings("unchecked")
    public <T> T get(Class<? extends T> classType) {
        T fallback = (T) (cache.containsKey(classType) ? cache.get(classType) : search(classType));
        return fallback;
    }

    private Object search(Class<?> classType) {
        Object bean = doSearch(classType);

        cache.put(classType, bean);

        return bean;
    }

    private Object doSearch(Class<?> classType) {
        try {
            return BeanFactoryAnnotationUtils.qualifiedBeanOfType(beanFactory, classType, QUALIFIER_NAME);
        } catch (NoSuchBeanDefinitionException e) {
            return null;
        }
    }
}