Java Socket网络编程
网络编程是Java编程中的重要组成部分，包括服务端和客户端两部分内容。Socket是Java网络编程的基本组件之一，用于在应用程序之间提供双向通信，Socket提供了一种标准的接口，允许应用程序通过网络发送和接收数据，在Java中，Socket可以分为客户端Socket和服务端Socket两种类型。
客户端Socket：客户端 Socket 用于与服务端 Socket 进行通信。客户端 Socket 通过指定服务端的 IP 地址和端口号，连接到服务端 Socket，然后发送数据到服务端 Socket。
服务端Socket：服务端 Socket 用于接收来自客户端 Socket 的连接请求，并在连接成功后，与客户端 Socket 进行通信。服务端 Socket 首先需要创建一个 ServerSocket 对象，并通过 bind 方法绑定到一个本地端口，然后等待客户端 Socket 的连接请求。
下面是Socket的一个示例：
服务端：
package org.example.demo1;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;public class Server {public static void main(String[] args) {try {ServerSocket serverSocket = new ServerSocket(8000);System.out.println("Server started, waiting for client...");Socket socket = serverSocket.accept();System.out.println("Client connected.");BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));PrintWriter out = new PrintWriter(socket.getOutputStream(), true);String message;while ((message = in.readLine()) != null) {System.out.println("Client:" + message);out.println("Server received message:" + message);}in.close();out.close();socket.close();serverSocket.close();} catch (IOException e) {e.printStackTrace();}}
}客户端：
package org.example.demo1;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;public class Client {public static void main(String[] args) {try {Socket socket = new Socket("localhost", 8000);System.out.println("Connected to server.");BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));PrintWriter out = new PrintWriter(socket.getOutputStream(), true);BufferedReader consoleIn = new BufferedReader(new InputStreamReader(System.in));String message;while ((message = consoleIn.readLine()) != null) {out.println(message);System.out.println("Server:" + in.readLine());}consoleIn.close();in.close();out.close();socket.close();} catch (IOException e) {e.printStackTrace();}}
}
首先启动服务端，然后启动客户端，在客户端的控制台，输入数据，服务端能接收到数据并返回对应的响应。
远程调用定时任务
首先，我们创建两个模块，core模块包含yang-job的一些核心内容，比如IJobExecutor执行器、JobExecuteRequest执行器请求等；client模块依赖core模块，并封装和socket客户端调用相关的一些内容。
然后创建一个sample1模块，用于演示。
core模块
core目前定义了定时任务执行类和其入参、出参等信息，其中，YangJobTransferDTO包含任务类路径和任务请求，如下所示：
package com.yang.job.dto;import com.yang.job.execute.YangJobExecuteRequest;import java.io.Serializable;public class YangJobTransferDTO implements Serializable {private String className;private YangJobExecuteRequest yangJobExecuteRequest;public String getClassName() {return className;}public void setClassName(String className) {this.className = className;}public YangJobExecuteRequest getYangJobExecuteRequest() {return yangJobExecuteRequest;}public void setYangJobExecuteRequest(YangJobExecuteRequest yangJobExecuteRequest) {this.yangJobExecuteRequest = yangJobExecuteRequest;}
}client模块
client模块定义了客户端所需要的一些类，其中，YangJob为注解类，对于每一个定时任务，需要加上YangJob注解，才能被正确调用。
package com.yang.job.client.annotations;import java.lang.annotation.*;@Documented
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface YangJob {
}
YangJobClientProperty为配置信息类，目前需要两个配置信息，客户端socket的ip和端口号
package com.yang.job.client.configuration;import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;@Component
public class YangJobClientProperty {@Value("${yang-job.executor.port}")private Integer port;@Value("${yang-job.executor.ip}")private String ip;public Integer getPort() {return port;}public void setPort(Integer port) {this.port = port;}public String getIp() {return ip;}public void setIp(String ip) {this.ip = ip;}
}
YangJobClientPostProcessor在SpringBoot加载完毕后，扫描bean，将实现IYongJobExecutor的bean，注册到YangJobClientManager的map中，方便后续调用
package com.yang.job.client.schema;import com.yang.job.client.annotations.YangJob;
import com.yang.job.client.YangJobClientManager;
import com.yang.job.execute.IYangJobExecutor;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;public class YangJobClientPostProcessor implements BeanPostProcessor {public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {if (!(bean instanceof IYangJobExecutor)) {return bean;}YangJob annotation = bean.getClass().getAnnotation(YangJob.class);if (annotation == null) {return bean;}YangJobClientManager.putJobExecutor(bean.getClass().getName(), (IYangJobExecutor) bean);return bean;}
}
YangJobClientManager负责监听端口和管理定时任务的执行，它会监听我们配置的yang-job.execute.port端口号，然后当接收到消息时，将消息转为入参，并取出对应的定时任务执行类，执行对应的代码。
package com.yang.job.client;import com.alibaba.fastjson.JSONObject;
import com.yang.job.client.dto.YangJobClientPropertyDTO;
import com.yang.job.core.dto.YangJobTransferDTO;
import com.yang.job.core.dto.ResultT;
import com.yang.job.core.execute.IYangJobExecutor;
import com.yang.job.core.execute.YangJobExecuteRequest;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;public class YangJobClientManager {private static Map<String, IYangJobExecutor> className2JobExecutorMap = new ConcurrentHashMap<>();private YangJobClientPropertyDTO yangJobClientPropertyDTO;private ServerSocket serverSocket;public YangJobClientManager(YangJobClientPropertyDTO yangJobClientPropertyDTO) {this.yangJobClientPropertyDTO = yangJobClientPropertyDTO;}public void init() {Integer port = this.yangJobClientPropertyDTO.getPort();try {this.serverSocket = new ServerSocket(port);} catch (IOException e) {throw new RuntimeException(e);}System.out.println("init success============");new Thread(() -> {while (true) {try {Socket socket = serverSocket.accept();BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));PrintWriter printWriter = new PrintWriter(socket.getOutputStream(), true);String params = bufferedReader.readLine();YangJobTransferDTO yangJobTransferDTO = JSONObject.parseObject(params, YangJobTransferDTO.class);System.out.println(yangJobTransferDTO);String className = yangJobTransferDTO.getClassName();YangJobExecuteRequest yangJobExecuteRequest = yangJobTransferDTO.getYangJobExecuteRequest();IYangJobExecutor jobExecutor = getJobExecutor(className);if (jobExecutor != null) {ResultT response = jobExecutor.execute(yangJobExecuteRequest);printWriter.println(JSONObject.toJSONString(response));}bufferedReader.close();printWriter.close();socket.close();} catch (IOException e) {e.printStackTrace();}if (serverSocket.isClosed() || serverSocket == null) {break;}}}).start();}public void shutdown() {if (this.serverSocket != null) {try {this.serverSocket.close();} catch (IOException e) {throw new RuntimeException(e);}}}public YangJobClientPropertyDTO getYangJobPropertyDTO() {return this.yangJobClientPropertyDTO;}public static void putJobExecutor(String className, IYangJobExecutor iJobExecutor) {className2JobExecutorMap.put(className, iJobExecutor);}public static IYangJobExecutor getJobExecutor(String className) {return className2JobExecutorMap.get(className);}}
YangJobClientContext为客户端的上下文，负责监听SpringBoot刷新消息和关闭消息，并执行对应的操作。
package com.yang.job.client;import com.yang.job.client.utils.SpringContextUtils;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ApplicationContextEvent;
import org.springframework.context.event.ContextClosedEvent;
import org.springframework.context.event.ContextRefreshedEvent;public class YangJobClientContext implements ApplicationListener<ApplicationContextEvent> {private static YangJobClientContext instance;private ApplicationContext applicationContext;@Overridepublic void onApplicationEvent(ApplicationContextEvent event) {if (event instanceof ContextRefreshedEvent) {System.out.println("刷新了=========");YangJobClientContext.instance = this;instance.applicationContext = applicationContext;init();} else if (event instanceof ContextClosedEvent) {System.out.println("销毁了=========");shutdown();}}private void init() {YangJobClientManager yangJobClientManager = SpringContextUtils.getBeanOfType(YangJobClientManager.class);yangJobClientManager.init();}private void shutdown() {YangJobClientManager yangJobClientManager = SpringContextUtils.getBeanOfType(YangJobClientManager.class);yangJobClientManager.shutdown();}
}
YangJobClientConfiguration为配置类，负责对YangJobClientPostProcessor、YangJobClientManager和YangJobClientContext的统一配置管理。
package com.yang.job.client.configuration;import com.yang.job.client.YangJobClientManager;
import com.yang.job.client.YangJobClientContext;
import com.yang.job.client.dto.YangJobClientPropertyDTO;
import com.yang.job.client.schema.YangJobClientPostProcessor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;@Configuration
public class YangJobClientConfiguration {@Autowiredprivate YangJobClientProperty yangJobClientProperty;@Beanpublic YangJobClientPostProcessor yangJobPostProcessor() {return new YangJobClientPostProcessor();}@Beanpublic YangJobClientManager yangJobClientManager() {YangJobClientPropertyDTO yangJobClientPropertyDTO = new YangJobClientPropertyDTO();yangJobClientPropertyDTO.setIp(yangJobClientProperty.getIp());yangJobClientPropertyDTO.setPort(yangJobClientProperty.getPort());return new YangJobClientManager(yangJobClientPropertyDTO);}@Beanpublic YangJobClientContext yangJobContext() {return new YangJobClientContext();}
}最后，为了使引入client依赖的应用，能自动装配我们提供的bean，我们在resources目录下创建META-INF目录，在该目录下创建spring.factories文件，文件内容如下：
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\com.yang.job.client.utils.SpringContextUtils,\com.yang.job.client.configuration.YangJobClientProperty,\com.yang.job.client.configuration.YangJobClientConfiguration
sample1
我们创建一个sample1项目，引入spring-boot-starter-web依赖和yang-client，yang-core的依赖
<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>com.yang</groupId><artifactId>yang-job-core</artifactId><version>1.0-SNAPSHOT</version></dependency><dependency><groupId>com.yang</groupId><artifactId>yang-job-client</artifactId><version>1.0-SNAPSHOT</version></dependency></dependencies>
创建启动类
package com.yang.job.sample1;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class YangJobSample1App {public static void main(String[] args) {SpringApplication.run(YangJobSample1App.class, args);}
}创建一个任务类：
package com.yang.job.sample1.task;import com.yang.job.client.annotations.YangJob;
import com.yang.job.dto.ResultT;
import com.yang.job.execute.IYangJobExecutor;
import com.yang.job.execute.YangJobExecuteRequest;
import org.springframework.stereotype.Component;@Component
@YangJob
public class TestTask1 implements IYangJobExecutor {@Overridepublic ResultT execute(YangJobExecuteRequest yangJobExecuteRequest) {System.out.println("开启定时任务了，入参为:" + yangJobExecuteRequest);return ResultT.success();}
}
添加配置文件，因为client模块的YangJobClientProperty需要有yang-job.executor.port和yang-job.executor.ip这两个配置，如果我们的配置文件中，缺少这些配置，会导致报错，无法启动项目。
spring:application:name: YangJobSample1App
yang-job:executor:port: 9999ip: 127.0.0.1
server:port: 8001
测试
我们先启动刚才的sample1项目，然后执行下列代码，来远程调用TestTask1方法执行类。
public static void main(String[] args) {try {Socket socket = new Socket("127.0.0.1", 9999);System.out.println("链接成功=============");PrintWriter printWriter = new PrintWriter(socket.getOutputStream(), true);BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));YangJobExecuteRequest yangJobExecuteRequest = new YangJobExecuteRequest();yangJobExecuteRequest.setJobId("1");yangJobExecuteRequest.addParam("num", "1");YangJobTransferDTO yangJobTransferDTO = new YangJobTransferDTO();yangJobTransferDTO.setClassName("com.yang.job.sample1.task.TestTask1");yangJobTransferDTO.setYangJobExecuteRequest(yangJobExecuteRequest);printWriter.println(JSONObject.toJSONString(yangJobTransferDTO));System.out.println("response:" + bufferedReader.readLine());bufferedReader.close();printWriter.close();socket.close();} catch (IOException e) {e.printStackTrace();}}
执行结果如下，说明我们能成功地进行远程调用。
添加远程任务
domain层
在上一篇文章中，我们操作的任务，都是本地任务，现在我们需要对远程任务进行操作，为了区分任务类型，我们首先在domain层添加一个任务类型枚举
package com.yang.job.admin.domain.enums;public enum JobTypeEnum {LOCAL("local", "本地任务"),REMOTE("remote", "远程任务");private String name;private String description;JobTypeEnum(String name, String description) {this.name = name;this.description = description;}public String getName() {return name;}public String getDescription() {return description;}public static JobTypeEnum getJobTypeByName(String name) {for (JobTypeEnum value : values()) {if (value.getName().equals(name)) {return value;}}return null;}
}然后修改YangJobModel，添加上任务类型枚举和远程任务信息
package com.yang.job.admin.domain.model;import com.yang.job.admin.client.dto.common.BusinessException;
import com.yang.job.admin.client.dto.common.ErrorCode;
import com.yang.job.admin.domain.enums.JobExecuteStrategyEnum;
import com.yang.job.admin.domain.enums.JobTypeEnum;
import com.yang.job.admin.domain.event.SaveJobPostEvent;
import com.yang.job.admin.domain.event.SubmitJobPostEvent;
import com.yang.job.admin.domain.event.UpdateJobPostEvent;
import com.yang.job.admin.domain.valueobject.RemoteExecutorMessage;
import com.yang.job.admin.infra.event.EventCenter;
import com.yang.job.admin.infra.job.YangJobManager;
import com.yang.job.admin.infra.job.request.YangJobSubmitParam;
import com.yang.job.admin.infra.utils.CronUtils;
import com.yang.job.admin.infra.utils.SpringContextUtils;
import lombok.Data;import java.io.Serializable;
import java.time.ZonedDateTime;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;@Data
public class YangJobModel implements Serializable {private Integer jobId;private String jobName;private String description;private String cron;private String executeClassPath;private Runnable runnable;private JobExecuteStrategyEnum executeStrategy;private JobTypeEnum jobType;private RemoteExecutorMessage remoteExecutorMessage;private Integer enable;private Integer open;private Date createTime;private Date updateTime;private Map<String, String> featureMap = new HashMap<>();private Map<String, String> executeParamMap = new HashMap<>();public boolean isEnable() {if (this.enable == null) {return false;}return this.enable == 1;}public boolean isOpen() {if (!isEnable()) {return false;}if (this.open == null) {return false;}return this.open == 1;}public boolean isClose() {return !isOpen();}public boolean isLocalJob() {return JobTypeEnum.LOCAL == this.jobType;}public boolean isRemoteJob() {return JobTypeEnum.REMOTE == this.jobType;}public void setExecuteStrategy(JobExecuteStrategyEnum jobExecuteStrategyEnum) {if (jobExecuteStrategyEnum == null) {throw new BusinessException(ErrorCode.EXECUTE_STRATEGY_NO_EXIST);}this.executeStrategy = jobExecuteStrategyEnum;}public void submitJob() {YangJobSubmitParam yangJobSubmitParam = convert2YangJobSubmitParam();YangJobManager yangJobManager = getYangJobManager();yangJobManager.submitJob(yangJobSubmitParam);// 提交任务后，发送提交任务后置事件SubmitJobPostEvent submitJobPostEvent = new SubmitJobPostEvent(yangJobSubmitParam);getEventCenter().postEvent(submitJobPostEvent);}public void cancelJob() {YangJobManager yangJobManager = getYangJobManager();yangJobManager.cancelJob(this.jobId);}private YangJobSubmitParam convert2YangJobSubmitParam() {YangJobSubmitParam yangJobBuildParam = new YangJobSubmitParam();yangJobBuildParam.setJobId(this.jobId);yangJobBuildParam.setRunnable(this.runnable);ZonedDateTime nextExecutionTime = CronUtils.nextExecutionTime(this.cron, ZonedDateTime.now());ZonedDateTime nextNextExecutionTime = CronUtils.nextExecutionTime(this.cron, nextExecutionTime);long nowEochMill = ZonedDateTime.now().toInstant().toEpochMilli();long executeEochMill = nextExecutionTime.toInstant().toEpochMilli();long secondExecuteEochMill = nextNextExecutionTime.toInstant().toEpochMilli();yangJobBuildParam.setInitialDelay((int)(executeEochMill - nowEochMill) / 1000);yangJobBuildParam.setPeriod((int)(secondExecuteEochMill - executeEochMill) / 1000);yangJobBuildParam.setJobExecuteStrategy(this.executeStrategy);return yangJobBuildParam;}public void postSaveJobEvent() {SaveJobPostEvent saveJobPostEvent = new SaveJobPostEvent(this.jobId);getEventCenter().asyncPostEvent(saveJobPostEvent);}public void postUpdateJobEvent() {UpdateJobPostEvent updateJobPostEvent = new UpdateJobPostEvent(this.jobId);getEventCenter().asyncPostEvent(updateJobPostEvent);}public void postDeleteJobEvent() {UpdateJobPostEvent updateJobPostEvent = new UpdateJobPostEvent(this.jobId);getEventCenter().asyncPostEvent(updateJobPostEvent);}private YangJobManager getYangJobManager() {return SpringContextUtils.getBeanOfType(YangJobManager.class);}private EventCenter getEventCenter() {return SpringContextUtils.getBeanOfType(EventCenter.class);}}
远程任务信息类：
package com.yang.job.admin.domain.valueobject;import lombok.Data;import java.io.Serializable;@Data
public class RemoteExecutorMessage implements Serializable {private String ip;private Integer port;
}接着我们添加一个features枚举，用于记录映射features字段中各个key表示的含义，因为我们现在表的设计中没有任务类型字段和远程信息相关的字段，所以会将这些信息添加到features字段中
package com.yang.job.admin.domain.enums;public enum JobModelFeatureEnum {JOB_TYPE("jobType", "任务类型"),REMOTE_EXECUTOR_IP("executorIp", "执行器ip"),REMOTE_EXECUTOR_PORT("executorPort", "执行器端口"),REMOTE_EXECUTOR_MESSAGE("r_executor_m", "远程执行器的信息");private String name;private String description;JobModelFeatureEnum(String name, String description) {this.name = name;this.description = description;}public String getName() {return name;}public String getDescription() {return description;}
}client层
我们修改原先的NewYangJobCommand类，加上任务类型属性
package com.yang.job.admin.client.dto.command;import lombok.Data;import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;@Data
public class NewYangJobCommand implements Serializable {private String jobName;private String description;private String cron;private String executeStrategy;private String jobType;private String executeClassPath;private Integer open;private Map<String, String> params = new HashMap<>();
}
然后修改YangJobDTO类，也加上jobType属性
package com.yang.job.admin.client.dto;import lombok.Data;import java.io.Serializable;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;@Data
public class YangJobDTO implements Serializable {private Integer jobId;private String jobName;private String description;private String cron;private String executeStrategy;private String executeClassPath;private String jobType;private Integer enable;private Integer open;private Date createTime;private Date updateTime;private Map<String, String> featureMap = new HashMap<>();private Map<String, String> executeParamMap = new HashMap<>();
}
application层
接着修改YangJobApplicationService类的convertYangJobModel方法，将jobType任务类型和远程任务信息添加到YangJobModel中
private YangJobModel convert2YangJobModel(NewYangJobCommand newYangJobCommand) {String jobType = newYangJobCommand.getJobType();JobTypeEnum jobTypeEnum = JobTypeEnum.getJobTypeByName(jobType);if (jobType == null) {throw new BusinessException(ErrorCode.PARAM_VALID_ERROR);}YangJobModel yangJobModel = new YangJobModel();yangJobModel.setJobName(newYangJobCommand.getJobName());yangJobModel.setDescription(newYangJobCommand.getDescription());yangJobModel.setCron(newYangJobCommand.getCron());yangJobModel.setOpen(newYangJobCommand.getOpen());yangJobModel.setExecuteStrategy(JobExecuteStrategyEnum.getJobExecuteStrategyByName(newYangJobCommand.getExecuteStrategy()));yangJobModel.setExecuteClassPath(newYangJobCommand.getExecuteClassPath());yangJobModel.setExecuteParamMap(newYangJobCommand.getParams());yangJobModel.setJobType(jobTypeEnum);if (jobTypeEnum == JobTypeEnum.REMOTE) {String ip = newYangJobCommand.getParams().get(JobModelFeatureEnum.REMOTE_EXECUTOR_IP.getName());String port = newYangJobCommand.getParams().get(JobModelFeatureEnum.REMOTE_EXECUTOR_PORT.getName());if (ip == null || port == null) {throw new BusinessException(ErrorCode.PARAM_VALID_ERROR);}RemoteExecutorMessage remoteExecutorMessage = new RemoteExecutorMessage();remoteExecutorMessage.setIp(ip);remoteExecutorMessage.setPort(Integer.valueOf(port));yangJobModel.setRemoteExecutorMessage(remoteExecutorMessage);} else {if (yangJobModel.getExecuteClassPath() == null || yangJobModel.getExecuteClassPath().isEmpty()) {throw new BusinessException(ErrorCode.UN_LEGAL_CLASS_PATH);}try {Class.forName(yangJobModel.getExecuteClassPath());} catch (ClassNotFoundException e) {e.printStackTrace();throw new BusinessException(ErrorCode.UN_LEGAL_CLASS_PATH);}}return yangJobModel;}
infra层
最后修改基础设施层，首先修改YangJobModelConvertor类，将RemoteMessage和JobType转化到features中，以及从features中取出
package com.yang.job.admin.infra.gatewayimpl.repository.convertor;import com.alibaba.fastjson.JSONObject;
import com.yang.job.admin.domain.enums.JobExecuteStrategyEnum;
import com.yang.job.admin.domain.enums.JobModelFeatureEnum;
import com.yang.job.admin.domain.enums.JobTypeEnum;
import com.yang.job.admin.domain.model.YangJobModel;
import com.yang.job.admin.domain.valueobject.RemoteExecutorMessage;
import com.yang.job.admin.infra.data.YangJobData;
import com.yang.job.admin.infra.job.thread.RemoteJobExecuteThread;
import com.yang.job.admin.infra.utils.FeaturesUtils;
import com.yang.job.core.dto.YangJobTransferDTO;
import com.yang.job.core.execute.IYangJobExecutor;
import com.yang.job.core.execute.YangJobExecuteRequest;
import org.springframework.stereotype.Component;import java.util.Map;@Component
public class YangJobModelConvertor {public YangJobData convert2Data(YangJobModel yangJobModel) {if (yangJobModel == null) {return null;}YangJobData yangJobData = new YangJobData();yangJobData.setJobId(yangJobModel.getJobId());yangJobData.setJobName(yangJobModel.getJobName());yangJobData.setDescription(yangJobModel.getDescription());yangJobData.setCron(yangJobModel.getCron());yangJobData.setExecuteClassPath(yangJobModel.getExecuteClassPath());yangJobData.setEnable(yangJobModel.getEnable());yangJobData.setOpen(yangJobModel.getOpen());yangJobData.setCreateTime(yangJobModel.getCreateTime());yangJobData.setUpdateTime(yangJobModel.getUpdateTime());Map<String, String> featureMap = yangJobModel.getFeatureMap();featureMap.put(JobModelFeatureEnum.JOB_TYPE.getName(), yangJobModel.getJobType().getName());featureMap.put(JobModelFeatureEnum.REMOTE_EXECUTOR_MESSAGE.getName(), JSONObject.toJSONString(yangJobModel.getRemoteExecutorMessage()));yangJobData.setFeatures(FeaturesUtils.convert2Features(featureMap));yangJobData.setExecuteParams(FeaturesUtils.convert2Features(yangJobModel.getExecuteParamMap()));yangJobData.setExecuteStrategy(yangJobModel.getExecuteStrategy().getName());return yangJobData;}public YangJobModel convert2Model(YangJobData yangJobData) {if (yangJobData == null) {return null;}YangJobModel yangJobModel = new YangJobModel();yangJobModel.setJobId(yangJobData.getJobId());yangJobModel.setDescription(yangJobData.getDescription());yangJobModel.setCron(yangJobData.getCron());yangJobModel.setJobName(yangJobData.getJobName());yangJobModel.setExecuteClassPath(yangJobData.getExecuteClassPath());yangJobModel.setEnable(yangJobData.getEnable());yangJobModel.setOpen(yangJobData.getOpen());yangJobModel.setCreateTime(yangJobData.getCreateTime());yangJobModel.setUpdateTime(yangJobData.getUpdateTime());yangJobModel.setFeatureMap(FeaturesUtils.convert2FeatureMap(yangJobData.getFeatures()));yangJobModel.setExecuteParamMap(FeaturesUtils.convert2FeatureMap(yangJobData.getExecuteParams()));JobExecuteStrategyEnum executeStrategy = JobExecuteStrategyEnum.getJobExecuteStrategyByName(yangJobData.getExecuteStrategy());if (executeStrategy == null) {throw new RuntimeException("执行策略有误!");}JobTypeEnum jobType = JobTypeEnum.getJobTypeByName(yangJobModel.getFeatureMap().get(JobModelFeatureEnum.JOB_TYPE.getName()));yangJobModel.setJobType(jobType);String remoteMessageStr = yangJobModel.getFeatureMap().get(JobModelFeatureEnum.REMOTE_EXECUTOR_MESSAGE.getName());RemoteExecutorMessage remoteExecutorMessage = JSONObject.parseObject(remoteMessageStr, RemoteExecutorMessage.class);yangJobModel.setRemoteExecutorMessage(remoteExecutorMessage);yangJobModel.setExecuteStrategy(executeStrategy);yangJobModel.setRunnable(buildRunnable(yangJobModel));return yangJobModel;}private Runnable buildRunnable(YangJobModel yangJobModel) {if (yangJobModel.isLocalJob()) {String executeClassPath = yangJobModel.getExecuteClassPath();try {Class<?> aClass = Class.forName(executeClassPath);if (!IYangJobExecutor.class.isAssignableFrom(aClass)) {throw new RuntimeException("该类必须实现IYangJobExecutor接口");}IYangJobExecutor executor = (IYangJobExecutor) aClass.newInstance();YangJobExecuteRequest yangJobExecuteRequest = convert2YangJobExecuteRequest(yangJobModel);Runnable runnable = () -> executor.execute(yangJobExecuteRequest);return runnable;} catch (InstantiationException | IllegalAccessException e) {e.printStackTrace();} catch (ClassNotFoundException e) {System.out.println(String.format("%s 类路径对应的类不存在", executeClassPath));e.printStackTrace();}} else {RemoteExecutorMessage remoteExecutorMessage = yangJobModel.getRemoteExecutorMessage();String executeClassPath = yangJobModel.getExecuteClassPath();YangJobTransferDTO yangJobTransferDTO = new YangJobTransferDTO();yangJobTransferDTO.setClassName(executeClassPath);YangJobExecuteRequest yangJobExecuteRequest = convert2YangJobExecuteRequest(yangJobModel);yangJobTransferDTO.setYangJobExecuteRequest(yangJobExecuteRequest);return new RemoteJobExecuteThread(remoteExecutorMessage, yangJobTransferDTO);}return null;}private static YangJobExecuteRequest convert2YangJobExecuteRequest(YangJobModel yangJobModel) {YangJobExecuteRequest yangJobExecuteRequest = new YangJobExecuteRequest();yangJobExecuteRequest.setJobId(yangJobModel.getJobId().toString());yangJobExecuteRequest.setParams(yangJobModel.getExecuteParamMap());return yangJobExecuteRequest;}
}然后添加一个RemoteJobExecuteThread类，该类实现runnable接口，当我们的任务类型为远程调用时，其YangJobModel的runnable属性为remoteJobExecuteThread类
package com.yang.job.admin.infra.job.thread;import com.alibaba.fastjson.JSONObject;
import com.yang.job.admin.domain.valueobject.RemoteExecutorMessage;
import com.yang.job.core.dto.YangJobTransferDTO;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;public class RemoteJobExecuteThread implements Runnable {private YangJobTransferDTO yangJobTransferDTO;private RemoteExecutorMessage remoteExecutorMessage;public RemoteJobExecuteThread(RemoteExecutorMessage remoteExecutorMessage, YangJobTransferDTO yangJobTransferDTO) {this.remoteExecutorMessage = remoteExecutorMessage;this.yangJobTransferDTO = yangJobTransferDTO;}@Overridepublic void run() {try {String ip = remoteExecutorMessage.getIp();Integer port = remoteExecutorMessage.getPort();Socket socket = new Socket(ip, port);PrintWriter printWriter = new PrintWriter(socket.getOutputStream(), true);BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));printWriter.println(JSONObject.toJSONString(yangJobTransferDTO));bufferedReader.close();printWriter.close();socket.close();} catch (UnknownHostException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}
}测试
我们先启动之前的sample1项目，然后启动yang-job-admin，调用http://localhost:8080/job添加任务，请求体如下：
{"jobName": "RemoteJobExecutor",
"description":"RemoteJobExecutor","cron": "0/10 * * * * ?","executeStrategy": "withFixedDelay","executeClassPath": "com.yang.job.sample1.task.TestTask1",
"open":1,
"jobType":"remote",
"params":{
"executorIp":"127.0.0.1",
"executorPort":"9999"
}
}
添加成功后，我们查看Sample1项目的控制台，可以看到，每10秒，这个TestTask1任务会被调用一次
参考文章
https://www.yihuo.tech/programming/server-stack/exploring-the-java-network-programming-paradigm-socket-udp-nio-and-netty-in-focus/
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