feature #I5WNMG 脚本组件支持javascript的语法

liteflow-script-plugin/liteflow-script-javascript/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>liteflow-script-plugin</artifactId>
+        <groupId>com.yomahub</groupId>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>liteflow-script-javascript</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.yomahub</groupId>
+            <artifactId>liteflow-core</artifactId>
+            <version>${revision}</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+</project>

liteflow-script-plugin/liteflow-script-javascript/src/main/java/com/yomahub/liteflow/script/javascript/JavaScriptExecutor.java

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+package com.yomahub.liteflow.script.javascript;
+
+import cn.hutool.core.bean.BeanUtil;
+import cn.hutool.core.util.ObjectUtil;
+import cn.hutool.core.util.StrUtil;
+import com.yomahub.liteflow.script.ScriptBeanManager;
+import com.yomahub.liteflow.script.ScriptExecuteWrap;
+import com.yomahub.liteflow.slot.DataBus;
+import com.yomahub.liteflow.slot.Slot;
+import com.yomahub.liteflow.script.ScriptExecutor;
+import com.yomahub.liteflow.script.exception.ScriptExecuteException;
+import com.yomahub.liteflow.script.exception.ScriptLoadException;
+import com.yomahub.liteflow.util.CopyOnWriteHashMap;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.script.*;
+import java.util.Map;
+
+/**
+ * JavaScript脚本语言的执行器实现
+ * @author Bryan.Zhang
+ * @since 2.9.1
+ */
+public class JavaScriptExecutor implements ScriptExecutor {
+
+    private final Logger log = LoggerFactory.getLogger(this.getClass());
+
+    private ScriptEngine scriptEngine;
+
+    private final Map<String, CompiledScript> compiledScriptMap = new CopyOnWriteHashMap<>();
+
+    @Override
+    public ScriptExecutor init() {
+        ScriptEngineManager scriptEngineManager = new ScriptEngineManager();
+        scriptEngine = scriptEngineManager.getEngineByName("javascript");
+        return this;
+    }
+
+    @Override
+    public void load(String nodeId, String script) {
+        try{
+            CompiledScript compiledScript = ((Compilable) scriptEngine).compile(script);
+            compiledScriptMap.put(nodeId, compiledScript);
+        }catch (Exception e){
+            String errorMsg = StrUtil.format("script loading error for node[{}], error msg:{}", nodeId, e.getMessage());
+            throw new ScriptLoadException(errorMsg);
+        }
+
+    }
+
+    @Override
+    public Object execute(ScriptExecuteWrap wrap) {
+        try{
+            if (!compiledScriptMap.containsKey(wrap.getNodeId())){
+                String errorMsg = StrUtil.format("script for node[{}] is not loaded", wrap.getNodeId());
+                throw new ScriptLoadException(errorMsg);
+            }
+
+            CompiledScript compiledScript = compiledScriptMap.get(wrap.getNodeId());
+            Bindings bindings = new SimpleBindings();
+
+            //往脚本语言绑定表里循环增加绑定上下文的key
+            //key的规则为自定义上下文的simpleName
+            //比如你的自定义上下文为AbcContext，那么key就为:abcContext
+            //这里不统一放一个map的原因是考虑到有些用户会调用上下文里的方法，而不是参数，所以脚本语言的绑定表里也是放多个上下文
+            DataBus.getContextBeanList(wrap.getSlotIndex()).forEach(o -> {
+                String key = StrUtil.lowerFirst(o.getClass().getSimpleName());
+                bindings.put(key, o);
+            });
+
+            //把wrap对象转换成元数据map
+            Map<String, Object> metaMap = BeanUtil.beanToMap(wrap);
+
+            //在元数据里放入主Chain的流程参数
+            Slot slot = DataBus.getSlot(wrap.getSlotIndex());
+            metaMap.put("requestData", slot.getRequestData());
+
+            //如果有隐式流程，则放入隐式流程的流程参数
+            Object subRequestData = slot.getChainReqData(wrap.getCurrChainName());
+            if (ObjectUtil.isNotNull(subRequestData)){
+                metaMap.put("subRequestData", subRequestData);
+            }
+
+            //往脚本上下文里放入元数据
+            bindings.put("_meta", metaMap);
+
+            //放入用户自己定义的bean
+            bindings.putAll(ScriptBeanManager.getScriptBeanMap());
+
+            return compiledScript.eval(bindings);
+        }catch (Exception e){
+            log.error(e.getMessage(), e);
+            String errorMsg = StrUtil.format("script execute error for node[{}]", wrap.getNodeId());
+            throw new ScriptExecuteException(errorMsg);
+        }
+    }
+
+    @Override
+    public void cleanCache() {
+        compiledScriptMap.clear();
+    }
+}

liteflow-script-plugin/liteflow-script-javascript/src/main/resources/META-INF/services/com.yomahub.liteflow.script.ScriptExecutor

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+# JavaScript的实现
+com.yomahub.liteflow.script.javascript.JavaScriptExecutor