org.springframework.boot.web.server.WebServerFactoryCustomizerBeanPostProcessor.java Source code

Introduction

Here is the source code for org.springframework.boot.web.server.WebServerFactoryCustomizerBeanPostProcessor.java

Source

/*
 * Copyright 2012-2017 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.boot.web.server;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.core.ResolvableType;
import org.springframework.core.annotation.AnnotationAwareOrderComparator;
import org.springframework.util.Assert;

/**
 * {@link BeanPostProcessor} that applies all {@link WebServerFactoryCustomizer} beans
 * from the bean factory to {@link WebServerFactory} beans.
 *
 * @author Dave Syer
 * @author Phillip Webb
 * @author Stephane Nicoll
 * @since 2.0.0
 */
public class WebServerFactoryCustomizerBeanPostProcessor implements BeanPostProcessor, BeanFactoryAware {

    private ListableBeanFactory beanFactory;

    private List<WebServerFactoryCustomizer<?>> customizers;

    @Override
    public void setBeanFactory(BeanFactory beanFactory) {
        Assert.isInstanceOf(ListableBeanFactory.class, beanFactory,
                "WebServerCustomizerBeanPostProcessor can only be used " + "with a ListableBeanFactory");
        this.beanFactory = (ListableBeanFactory) beanFactory;
    }

    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        if (bean instanceof WebServerFactory) {
            postProcessBeforeInitialization((WebServerFactory) bean);
        }
        return bean;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        return bean;
    }

    private void postProcessBeforeInitialization(WebServerFactory bean) {
        for (WebServerFactoryCustomizer<?> customizer : getCustomizers()) {
            Class<?> type = ResolvableType.forClass(WebServerFactoryCustomizer.class, customizer.getClass())
                    .getGeneric().resolve(WebServerFactory.class);
            if (type.isInstance(bean)) {
                invokeCustomizer(customizer, bean);
            }
        }
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    private void invokeCustomizer(WebServerFactoryCustomizer customizer, WebServerFactory webServerFactory) {
        try {
            customizer.customize(webServerFactory);
        } catch (ClassCastException ex) {
            String msg = ex.getMessage();
            if (msg == null || msg.startsWith(webServerFactory.getClass().getName())) {
                // Possibly a lambda-defined listener which we could not resolve the
                // generic event type for
                logLambdaDebug(customizer, ex);
            } else {
                throw ex;
            }
        }
    }

    private void logLambdaDebug(WebServerFactoryCustomizer<?> customizer, ClassCastException ex) {
        Log logger = LogFactory.getLog(getClass());
        if (logger.isDebugEnabled()) {
            logger.debug("Non-matching factory type for customizer: " + customizer, ex);
        }
    }

    private Collection<WebServerFactoryCustomizer<?>> getCustomizers() {
        if (this.customizers == null) {
            // Look up does not include the parent context
            this.customizers = new ArrayList<>(getWebServerFactoryCustomizerBeans());
            Collections.sort(this.customizers, AnnotationAwareOrderComparator.INSTANCE);
            this.customizers = Collections.unmodifiableList(this.customizers);
        }
        return this.customizers;
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    private Collection<WebServerFactoryCustomizer<?>> getWebServerFactoryCustomizerBeans() {
        return (Collection) this.beanFactory.getBeansOfType(WebServerFactoryCustomizer.class, false, false)
                .values();
    }

}