前段时间公司做接口封装。 领导推荐一种封装规范。 processor : 传入string[] params, 实现逻辑自己去根据processor接口规范实现 init(params) 和 execute() 对于每个接口形成参数模板,初始化,执行之后,返回实体,得到有效实体,保存到数据库。 相当于对processor 的方法体进行参数化。 与storm drpc 的LinearDRPCTopologyBuilder 非常相似。 源码 package backtype.storm.drpc; @Deprecated public class LinearDRPCTopologyBuilder { String _function; List<Component> _components = new ArrayList<Component>(); public LinearDRPCTopologyBuilder(String function) { _function = function; } ............. } 开发人员调用 /** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.sxt.storm.drpc; import backtype.storm.Config; import backtype.storm.LocalCluster; import backtype.storm.LocalDRPC; import backtype.storm.StormSubmitter; import backtype.storm.drpc.LinearDRPCTopologyBuilder; import backtype.storm.topology.BasicOutputCollector; import backtype.storm.topology.OutputFieldsDeclarer; import backtype.storm.topology.base.BaseBasicBolt; import backtype.storm.tuple.Fields; import backtype.storm.tuple.Tuple; import backtype.storm.tuple.Values; /** * This topology is a basic example of doing distributed RPC on top of Storm. It * implements a function that appends a "!" to any string you send the DRPC * function. * <p/> * See https://github.com/nathanmarz/storm/wiki/Distributed-RPC for more * information on doing distributed RPC on top of Storm. */ public class BasicDRPCTopology { public static class ExclaimBolt extends BaseBasicBolt { @Override public void execute(Tuple tuple, BasicOutputCollector collector) { String input = tuple.getString(1); collector.emit(new Values(tuple.getValue(0), input + "!")); } @Override public void declareOutputFields(OutputFieldsDeclarer declarer) { declarer.declare(new Fields("id", "result")); } } public static void main(String[] args) throws Exception { LinearDRPCTopologyBuilder builder = new LinearDRPCTopologyBuilder("exclamation"); builder.addBolt(new ExclaimBolt(), 3); Config conf = new Config(); if (args == null || args.length == 0) { LocalDRPC drpc = new LocalDRPC(); LocalCluster cluster = new LocalCluster(); cluster.submitTopology("drpc-demo", conf, builder.createLocalTopology(drpc)); for (String word : new String[] { "hello", "goodbye" }) { System.err.println("Result for \"" + word + "\": " + drpc.execute("exclamation", word)); } cluster.shutdown(); drpc.shutdown(); } else { conf.setNumWorkers(3); StormSubmitter.submitTopologyWithProgressBar(args[0], conf, builder.createRemoteTopology()); } } }