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    • com.jarvis.cache.serializer.FastjsonSerializer Maven / Gradle / Ivy

    package com.jarvis.cache.serializer;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.jarvis.cache.reflect.generics.ParameterizedTypeImpl;
import com.jarvis.cache.to.CacheWrapper;
import com.jarvis.lib.util.BeanUtil;

import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Calendar;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;

/**
 *
 */
public class FastjsonSerializer implements ISerializer {

    private final Charset charset;

    private static final SerializerFeature[] FEATURES = {SerializerFeature.DisableCircularReferenceDetect};

    private static final Map TYPE_CACHE = new ConcurrentHashMap<>(1024);

    public FastjsonSerializer() {
        this(StandardCharsets.UTF_8);
    }

    public FastjsonSerializer(Charset charset) {
        this.charset = charset;
    }

    @Override
    public byte[] serialize(final Object obj) throws Exception {
        if (obj == null) {
            return null;
        }
        String json = JSON.toJSONString(obj, FEATURES);
        return json.getBytes(charset);
    }

    @Override
    public Object deserialize(final byte[] bytes, final Type returnType) throws Exception {
        if (null == bytes || bytes.length == 0) {
            return null;
        }
        ParameterizedTypeImpl type = TYPE_CACHE.get(returnType);
        if (null == type) {
            Type[] agsType = new Type[]{returnType};
            type = ParameterizedTypeImpl.make(CacheWrapper.class, agsType, null);
            TYPE_CACHE.put(returnType, type);
        }
        String json = new String(bytes, charset);
        return JSON.parseObject(json, type);
    }

    @SuppressWarnings({"rawtypes", "unchecked"})
    @Override
    public Object deepClone(Object obj, final Type type) throws Exception {
        if (null == obj) {
            return null;
        }
        Class clazz = obj.getClass();
        if (BeanUtil.isPrimitive(obj) || clazz.isEnum() || obj instanceof Class || clazz.isAnnotation()
                || clazz.isSynthetic()) {// 常见不会被修改的数据类型
            return obj;
        }
        if (obj instanceof Date) {
            return ((Date) obj).clone();
        } else if (obj instanceof Calendar) {
            Calendar cal = Calendar.getInstance();
            cal.setTimeInMillis(((Calendar) obj).getTime().getTime());
            return cal;
        }
        // List/Map在编译时类型会被擦除，导致List反序列化后变为List
        if (null != type && !(obj instanceof Collection) && !(obj instanceof Map)) {
            String json = JSON.toJSONString(obj, FEATURES);
            return JSON.parseObject(json, type);
        }

        if (clazz.isArray()) {
            Object[] arr = (Object[]) obj;

            Object[] res = ((Object) clazz == (Object) Object[].class) ? (Object[]) new Object[arr.length]
                    : (Object[]) Array.newInstance(clazz.getComponentType(), arr.length);
            for (int i = 0; i < arr.length; i++) {
                res[i] = deepClone(arr[i], null);
            }
            return res;
        } else if (obj instanceof Collection) {
            Collection tempCol = (Collection) obj;
            Collection res = tempCol.getClass().newInstance();

            Iterator it = tempCol.iterator();
            while (it.hasNext()) {
                Object val = deepClone(it.next(), null);
                res.add(val);
            }
            return res;
        } else if (obj instanceof Map) {
            Map tempMap = (Map) obj;
            Map res = tempMap.getClass().newInstance();
            Iterator it = tempMap.entrySet().iterator();
            while (it.hasNext()) {
                Map.Entry entry = (Entry) it.next();
                Object key = entry.getKey();
                Object val = entry.getValue();
                res.put(deepClone(key, null), deepClone(val, null));
            }
            return res;
        } else if (obj instanceof CacheWrapper) {
            CacheWrapper wrapper = (CacheWrapper) obj;
            CacheWrapper res = new CacheWrapper();
            res.setExpire(wrapper.getExpire());
            res.setLastLoadTime(wrapper.getLastLoadTime());
            res.setCacheObject(deepClone(wrapper.getCacheObject(), null));
            return res;
        } else {
            String json = JSON.toJSONString(obj, FEATURES);
            return JSON.parseObject(json, clazz);
        }
    }

    @Override
    public Object[] deepCloneMethodArgs(Method method, Object[] args) throws Exception {
        if (null == args || args.length == 0) {
            return args;
        }
        Type[] genericParameterTypes = method.getGenericParameterTypes();
        if (args.length != genericParameterTypes.length) {
            throw new Exception("the length of " + method.getDeclaringClass().getName() + "." + method.getName()
                    + " must " + genericParameterTypes.length);
        }
        Class clazz = args.getClass();
        Object[] res = ((Object) clazz == (Object) Object[].class) ? (Object[]) new Object[args.length]
                : (Object[]) Array.newInstance(clazz.getComponentType(), args.length);
        int len = genericParameterTypes.length;
        for (int i = 0; i < len; i++) {
            Type genericParameterType = genericParameterTypes[i];
            Object obj = args[i];
            if (genericParameterType instanceof ParameterizedType) {
                String json = JSON.toJSONString(obj, FEATURES);
                res[i] = JSON.parseObject(json, genericParameterType);
            } else {
                res[i] = deepClone(obj, null);
            }
        }
        return res;
    }
}
    
    
    
    

    




    
    
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