org.apache.servicecomb.foundation.common.utils.BeanUtils.java Source code

Introduction

Here is the source code for org.apache.servicecomb.foundation.common.utils.BeanUtils.java

Source

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.servicecomb.foundation.common.utils;

import java.util.LinkedHashSet;
import java.util.Set;

import org.apache.commons.lang3.StringUtils;
import org.springframework.aop.TargetClassAware;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public final class BeanUtils {
    public static final String DEFAULT_BEAN_RESOURCE = "classpath*:META-INF/spring/*.bean.xml";

    public static final String SCB_SCAN_PACKAGE = "scb-scan-package";

    private static final String SCB_PACKAGE = "org.apache.servicecomb";

    private static ApplicationContext context;

    private BeanUtils() {
    }

    public static void init() {
        init(DEFAULT_BEAN_RESOURCE);
    }

    public static void init(String... configLocations) {
        prepareServiceCombScanPackage();

        context = new ClassPathXmlApplicationContext(configLocations);
    }

    public static void prepareServiceCombScanPackage() {
        Set<String> scanPackags = new LinkedHashSet<>();
        // add exists settings
        String exists = System.getProperty(SCB_SCAN_PACKAGE);
        if (exists != null) {
            for (String exist : exists.trim().split(",")) {
                if (!exist.isEmpty()) {
                    scanPackags.add(exist.trim());
                }
            }
        }

        // ensure servicecomb package exist
        scanPackags.add(SCB_PACKAGE);

        // add main class package
        Class<?> mainClass = JvmUtils.findMainClass();
        if (mainClass != null) {
            String pkg = mainClass.getPackage().getName();
            if (!pkg.startsWith(SCB_PACKAGE)) {
                scanPackags.add(pkg);
            }
        }

        // finish
        System.setProperty(SCB_SCAN_PACKAGE, StringUtils.join(scanPackags, ","));
    }

    public static ApplicationContext getContext() {
        return context;
    }

    public static void setContext(ApplicationContext applicationContext) {
        context = applicationContext;
    }

    /**
     * ???????
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) {
        return (T) context.getBean(name);
    }

    public static Class<?> getImplClassFromBean(Object bean) {
        if (TargetClassAware.class.isInstance(bean)) {
            return ((TargetClassAware) bean).getTargetClass();
        }

        return bean.getClass();
    }
}