feature #I44FT8 支持脚本语言的组件，并支持动态刷新脚本(版本特性)

liteflow-script-common/src/main/java/com/yomahub/liteflow/script/ScriptFactory.java

@@ -1,6 +1,7 @@
 package com.yomahub.liteflow.script;
 
 import cn.hutool.core.util.ObjectUtil;
+import com.yomahub.liteflow.script.exception.ScriptSpiException;
 
 import java.util.ServiceLoader;
 
@@ -8,7 +9,7 @@ public class ScriptFactory {
 
     private static ScriptFactory scriptFactory;
 
-    private static ScriptExecutor scriptExecutor;
+    private ScriptExecutor scriptExecutor;
 
     public static ScriptFactory loadInstance(){
         if (ObjectUtil.isNull(scriptFactory)){
@@ -20,9 +21,12 @@ public class ScriptFactory {
     public ScriptExecutor getScriptExecutor(){
         if (ObjectUtil.isNull(scriptExecutor)){
             ServiceLoader<ScriptExecutor> loader = ServiceLoader.load(ScriptExecutor.class);
+
             if (loader.iterator().hasNext()){
                 scriptExecutor = loader.iterator().next().init();
                 return scriptExecutor;
+            }else{
+                throw new ScriptSpiException("script spi component failed to load");
             }
         }
         return scriptExecutor;

liteflow-script-common/src/main/java/com/yomahub/liteflow/script/exception/ScriptSpiException.java

@@ -0,0 +1,27 @@
+
+package com.yomahub.liteflow.script.exception;
+
+/**
+ * 脚本SPI插件加载异常
+ * @author Bryan.Zhang
+ * @since 2.5.11
+ */
+public class ScriptSpiException extends RuntimeException {
+
+	private static final long serialVersionUID = 1L;
+
+	/** 异常信息 */
+	private String message;
+
+	public ScriptSpiException(String message) {
+		this.message = message;
+	}
+
+	public String getMessage() {
+		return message;
+	}
+
+	public void setMessage(String message) {
+		this.message = message;
+	}
+}