背景

使用开源thingsboard源码，实现自定义节点的功能。版本3.42

代码

package org.thingsboard.rule.engine.custom;import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import lombok.extern.slf4j.Slf4j;
import org.thingsboard.common.util.JacksonUtil;
import org.thingsboard.rule.engine.api.*;
import org.thingsboard.server.common.data.plugin.ComponentType;
import org.thingsboard.server.common.msg.TbMsg;import java.nio.charset.Charset;
import java.util.concurrent.ExecutionException;@Slf4j
@RuleNode(type = ComponentType.FILTER,name = "engine",configClazz = EmptyNodeConfiguration.class,nodeDescription = "巴拉巴拉巴拉",nodeDetails = "巴拉巴拉巴拉",uiResources = {"static/rulenode/rulenode-core-config.js"},configDirective = "tbNodeEmptyConfig",iconUrl = "data:image/svg+xml;base64,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"
)
public class TbEENode implements TbNode {private static final Charset UTF8 = Charset.forName("UTF-8");private static final String ERROR = "error";@Overridepublic void init(TbContext ctx, TbNodeConfiguration configuration) throws TbNodeException {System.out.println("TbEENode init");}@Overridepublic void onMsg(TbContext ctx, TbMsg msg) throws ExecutionException, InterruptedException, TbNodeException {try {//在原始数据中加入一个字段和值JsonNode json = JacksonUtil.toJsonNode(msg.getData());ObjectNode result = (ObjectNode) json;result.put("myNode", "3333333333333333");ctx.tellSuccess(TbMsg.transformMsg(msg, msg.getType(), msg.getOriginator(), msg.getMetaData(), JacksonUtil.toString(result)));}catch (Exception e){ctx.tellNext(msg, TbRelationTypes.FAILURE);}}@Overridepublic void destroy() {System.out.println("TbEENode destroy");}
}

增加这段代码后，平台租户管理员会自动加上改节点，该节点比较简单，没有从前端页面传入的参数。可以参考其他节点实现更加丰富的功能。