dubbo JsonUtils 源码

dubbo JsonUtils 代码

文件路径：/dubbo-common/src/main/java/org/apache/dubbo/common/utils/JsonUtils.java

/*
 * 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.dubbo.common.utils;

import org.apache.dubbo.common.constants.CommonConstants;
import org.apache.dubbo.common.json.JSON;
import org.apache.dubbo.common.json.impl.FastJsonImpl;
import org.apache.dubbo.common.json.impl.GsonImpl;

import java.util.Arrays;
import java.util.List;

public class JsonUtils {
    private static volatile JSON json;

    public static JSON getJson() {
        if (json == null) {
            synchronized (JsonUtils.class) {
                if (json == null) {
                    String preferJsonFrameworkName = System.getProperty(CommonConstants.PREFER_JSON_FRAMEWORK_NAME);
                    if (StringUtils.isNotEmpty(preferJsonFrameworkName)) {
                        try {
                            JSON instance = null;
                            switch (preferJsonFrameworkName) {
                                case "fastjson":
                                    instance = new FastJsonImpl();
                                    break;
                                case "gson":
                                    instance = new GsonImpl();
                                    break;
                            }
                            if (instance != null && instance.isSupport()) {
                                json = instance;
                            }
                        } catch (Throwable ignore) {

                        }
                    }
                    if (json == null) {
                        List<Class<? extends JSON>> jsonClasses = Arrays.asList(
                            FastJsonImpl.class,
                            GsonImpl.class);
                        for (Class<? extends JSON> jsonClass : jsonClasses) {
                            try {
                                JSON instance = jsonClass.getConstructor().newInstance();
                                if (instance.isSupport()) {
                                    json = instance;
                                    break;
                                }
                            } catch (Throwable ignore) {

                            }
                        }
                    }
                    if (json == null) {
                        throw new IllegalStateException("Dubbo unable to find out any json framework (e.g. fastjson, gson) from jvm env. " +
                            "Please import at least one json framework.");
                    }
                }
            }
        }
        return json;
    }

    /**
     * @deprecated for uts only
     */
    @Deprecated
    protected static void setJson(JSON json) {
        JsonUtils.json = json;
    }
}

相关信息

dubbo 源码目录

相关文章

dubbo AnnotationUtils 源码

dubbo ArrayUtils 源码

dubbo Assert 源码

dubbo AtomicPositiveInteger 源码

dubbo CIDRUtils 源码

dubbo CharSequenceComparator 源码

dubbo ClassHelper 源码

dubbo ClassLoaderResourceLoader 源码

dubbo ClassUtils 源码

dubbo CollectionUtils 源码