基于V8的JsonMapper

概述<dependency> <groupId>com.eclipsesource.j2v8</groupId> <artifactId>j2v8_win32_x86_64</artifactId> <version>4.6.0</version> <scope>compile</scope> </dependency> <dependency> <groupI

<dependency>
    <groupID>com.eclipsesource.j2v8</groupID>
    <artifactID>j2v8_win32_x86_64</artifactID>
    <version>4.6.0</version>
    <scope>compile</scope>
</dependency>
<dependency>
    <groupID>com.eclipsesource.j2v8</groupID>
    <artifactID>j2v8_linux_x86_64</artifactID>
    <version>4.6.0</version>
    <scope>compile</scope>
</dependency>

package org.rx.util;import com.alibaba.fastJson.JsONObject;import com.eclipsesource.v8.V8;import com.eclipsesource.v8.V8Object;import com.Google.common.annotations.Beta;import com.Google.common.base.Strings;import lombok.SneakyThrows;import lombok.extern.slf4j.Slf4j;import org.rx.annotation.ErrorCode;import org.rx.common.*;import java.net.URL;import java.nio.file.Path;import java.nio.file.Paths;import java.util.Collections;import java.util.HashMap;import java.util.Map;import static org.rx.common.Contract.*;@Beta@Slf4jpublic final class JsonMapper extends disposable {    private static class V8Console {        public voID log(String message) {            log.info("[V8] {}",message);        }        public voID error(String message) {            log.error("[V8] {}",message);        }    }    public static final JsonMapper Default = new JsonMapper("Jscript/");    private static final String scriptFunc = "(function(){var $={},$val=JsON.parse(_x); %s; return JsON.stringify($);})()";    private Map<String,Object> settings;    private Lazy<V8> runtime;    public JsonMapper(String configPath) {        settings = refreshSettings(configPath);        runtime = new Lazy<>(() -> {            V8 v8 = V8.createV8Runtime();            V8Object v8Console = new V8Object(v8);            v8.add("console",v8Console);            V8Console console = new V8Console();            Class[] argTypes = new Class[]{String.class};            v8Console.registerJavaMethod(console,"log","log",argTypes);            v8Console.registerJavaMethod(console,"error","error",argTypes);            v8.executeScript("console.log(‘V8 start..‘);");            return v8;        });    }    @OverrIDe    protected voID freeObjects() {        if (runtime.isValueCreated()) {            runtime.getValue().release();            runtime = null;        }    }    public <F,T> T convertTo(Class<T> toType,F from) {        require(toType,from);        return convertTo(toType,from.getClass().getname(),from);    }    public <T> T convertTo(Class<T> toType,String configKey,Object sourceValue) {        require(toType,configKey);        String script = getScript(toType,configKey);        V8 v8 = runtime.getValue();        v8.add("_x",toJsonString(sourceValue));        String jResult = v8.executeStringScript(String.format(scriptFunc,script));        return JsONObject.parSEObject(jResult,toType);    }    @ErrorCode(value = "keyError",messageKeys = {"$key"})    private String getScript(Class tType,String key) {        String tKey = tType.getname();        Map<String,Object> v = as(settings.get(tKey),Map.class);        if (v == null) {            throw new SystemException(values(tKey),"keyError");        }        String script = (String) v.get(key);        if (Strings.isNullOrEmpty(script)) {            throw new SystemException(values(tKey + "." + key),"keyError");        }        return script;    }    @SneakyThrows    private Map<String,Object> refreshSettings(String configPath) {        URL path = App.getClassLoader().getResource(configPath);        if (path == null) {            return Collections.emptyMap();        }        Map<String,Object> map = new HashMap<>();        for (Path p : App.fileStream(Paths.get(path.toURI()))) {            try {                map.putAll(App.loadYaml(p.toString()));            } catch (Exception e) {                log.error("refreshSettings",e);            }        }        return map;    }}

 

org.rx.util.DemoBean:  demoKey: >  $.ID=$val.ID;

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