Java线程监控及中断
我们系统中经常有耗费时间长的任务，但客户端往往需要马上得到回应。这时我们就可以如下步骤实现：
１、客户端发起请求执行任务（选定条件，下载报表）；
２、首先将任务ID及开始时间，起始状态记录到数据库表中；
３、另起一个后台线程去执行这个耗时任务（比如生成报表）；
４、线程执行成功或失败状态记录到数据库；
５、客户通过异步查询数据（下载报表或其他操作）。
好了，大致步骤我们清楚了。假如这个耗时任务一直执行，而且和消耗系统资源。我们往往想放弃这个任务的执行，再缩小范围执行更小的任务执行。那我们如何实现呐！
话不多说，直接上代码：
１．首先我们实现一个线程管理工具：
import java.sql.DriverManager
import java.util.concurrent.ConcurrentHashMap
import org.slf4j.LoggerFactory
import scala.util.{Failure, Success, Try}
/**
* 类功能描述：报表线程管理器
*
* @author WangXueXing create at 18-11-2 上午11:35
* @version 1.0.0
*/
object ReportThreadManager {
private val logger = LoggerFactory.getLogger(getClass)
/**
* 报表ID与对应线程map
*/
val REPORT_THREAD_MAP: ConcurrentHashMap[Long, Thread] = new ConcurrentHashMap()
/**
* 将对应报表子线程放入线程池
*
* @param reportId 报表ID
* @param thread 对应子线程
*/
def put(reportId: Long, thread: Thread): Unit = {
REPORT_THREAD_MAP.put(reportId, thread)
}
/**
* 获取对应报表线程
* @param reportId 报表ID
* @return
*/
def get(reportId: Long): Thread ={
REPORT_THREAD_MAP.get(reportId)
}
/**
* 将对应报表子线程移除线程池
* @param reportId 报表ID
*/
def remove(reportId: Long): Unit ={
REPORT_THREAD_MAP.remove(reportId)
}
/**
* 销毁指定报表子线程
* @param reportId 报表ID
*/
def deploy(reportId: Long)={
val thread = REPORT_THREAD_MAP.get(reportId)
if(thread != null){
Try{
if(!thread.isInterrupted){
logger.info(s"线程:${reportId} 开始被结束")
logger.info("before interrupt")
thread.getStackTrace.foreach(println)
thread.interrupt()
Thread.sleep(10)
logger.info("after interrupt")
thread.getStackTrace.foreach(println)
}
} match {
case Success(x) => logger.info(s"线程:${reportId} 被成功杀死")
case Failure(e) => logger.error(s"线程:${reportId} interrupt 失败", e)
}
REPORT_THREAD_MAP.remove(reportId)
}
}
val thread1 = new Thread(new Runnable {
override def run(): Unit = {
ReportThreadManager.deploy(1)
println(s"thread 1 killed")
}
})
def main(args: Array[String]): Unit = {
Class.forName("org.apache.hive.jdbc.HiveDriver")
val con = DriverManager.getConnection("jdbc:hive2://192.168.71.127:10000/finance", "goods", null)
val stmt = con.createStatement
var res = stmt.executeQuery("SELECT company_name,store_code,store_name,source_date,trade_type,trade_no,third_party_payment_no,business_type,cast(business_amount as decimal(20, 2)) business_amount,cast(service_charge as decimal(20, 4)) service_charge,trade_time,customer_account,updated_at,created_at FROM t_pay_source_data")
while(res.next()){
println(res.getString(1))
}
}
}
此工具可以实现根据任务ＩＤ添加当前任务执行线程，也可以从线程池移除此线程，根据任务ＩＤ中断线程。
２．如下任务执行过程及如何调用线程管理及中断线程：
import java.io.{File, FileInputStream}
import com.today.api.financereport.scala.request.ReportInfo
import com.today.api.financereport.scala.response.ServiceResponse
import com.today.service.financereport.action.{ExportReportRecordFailureAction, ExportReportRecordSuccessAction, StartExportReportAction}
import com.today.service.financereport.common.ReportThreadManager
import com.today.service.financereport.dto.{ExportReportFailureInput, ExportReportSuccessInput, ReportOutput}
import com.today.service.financereport.util.{Debug, OssUtil}
import org.slf4j.LoggerFactory
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.Future
import scala.util.control.NonFatal
import scala.util.{Failure, Success}
/**
* 报表导出流程限定类
*
* @author BarryWang create at 2018/5/17 9:15
* @version 0.0.1
*/
trait ReportAction {
protected val logger = LoggerFactory.getLogger(getClass)
/**
* 报表导出流程
* @return
*/
def execute: ServiceResponse = {
var result:ServiceResponse = null
var count = Counter.count
logger.info(s"---1生成报表前运行个数:${count}----------")
if(count >= Counter.MAX_COUNT.intValue()){
result = ServiceResponse("405", s"目前有多个报表正在导出，请５分钟后再操作，谢谢!")
} else {
Counter.increment
count = Counter.count
logger.info(s"---2启动生成报表运行个数:${count}----------")
var reportId: Long = -1
try {
//1. 前置检查
preCheck
//2. 开始生成报表纪录
val reportInfo = setReportInfo
reportId = startGenerate
//3. 生成报表处理
val output: Future[ReportOutput] = Future {
Debug.reset()
//添加当前子线程到线程管理池
ReportThreadManager.put(reportId, Thread.currentThread())
//1) 加载模板
val templateInfo = Debug.trace(s"${reportInfo.reportType}-loadTemplate:")(loadTemplate(setTemplatePath))
//2) 生成报表
Debug.trace(s"${reportInfo.reportType}-generateReport:")(generateReport(reportId, templateInfo))
//3) 保存报表
val output = Debug.trace(s"${reportInfo.reportType}-saveReport:")(saveReport(templateInfo.localFile))
//将此子线程从线程管理池移除
ReportThreadManager.remove(reportId)
Debug.info()
output
}
output.onComplete {
case Success(v) => {
successGenerate(ExportReportSuccessInput(reportId, v))
Counter.decrement
count = Counter.count
logger.info(s"---3结束报表生成运行个数:${count}----------")
}
case Failure(e) => {
failureGenerate(ExportReportFailureInput(reportId, e))
Counter.decrement
count = Counter.count
logger.info(s"---3结束报表生成运行个数:${count}----------")
}
}
//4. 后置检查
postCheck
result = ServiceResponse("200", "请到导出管理查看或下载报表")
} catch {
case NonFatal(e) =>
Counter.decrement
count = Counter.count
logger.info(s"---3结束报表生成运行个数:${count}----------")
failureGenerate(ExportReportFailureInput(reportId, e))
throw e
} finally {}
}
result
}
/**
* 前置条件检查：动作、状态等业务逻辑
*/
def preCheck
/**
* 设置报表信息
* @return
*/
def setReportInfo: ReportInfo
/**
* 设置模板路径
* @return
*/
def setTemplatePath: String
/**
* 开始生成报表纪录
*/
def startGenerate(): Long = {
new StartExportReportAction(setReportInfo).execute
}
/**
* 加载模板
* @param templatPath
*/
def loadTemplate(templatPath: String): ExcelTemaplateInfo = {
val suffix = isZip match {
case true => ".zip"
case false => ".xlsx"
}
//生成本地文件
val localFile = File.createTempFile(downloadFileName+"_", suffix)
ExcelTemaplateInfo(templatPath, localFile)
}
/**
* 下载文件名
* @return
*/
def downloadFileName: String = setReportInfo.reportType.name
/**
* 根据数据生成报表
* @return
*/
def generateReport(reportId: Long, templateInfo: ExcelTemaplateInfo)
/**
* 将生成在本地的报表上传到阿里SSO
* @param localFile
* @return
*/
def saveReport(localFile: File): ReportOutput = {
val fileUrl = OssUtil.uploadFileStream(new FileInputStream(localFile), localFile.getName)
localFile.deleteOnExit()
val suffix = isZip match {
case true => ".zip"
case false => ".xlsx"
}
// OssUtil.downloadFile(fileUrl, "/home/barry/data/1122322"+suffix)
ReportOutput(fileUrl)
}
/**
* 最终生成报表是否为Zip
* @return
*/
def isZip: Boolean
/**
* 成功生成报表纪录
* @param result: ExportReportSuccessInput
*/
def successGenerate(result: ExportReportSuccessInput): Unit = {
new ExportReportRecordSuccessAction(result).execute
}
/**
* 失败生成报表纪录
* @param result: ExportReportFailureInput
*/
def failureGenerate(result: ExportReportFailureInput): Unit = {
new ExportReportRecordFailureAction(result).execute
}
/**
* 后置检查
*/
def postCheck = {}
}
３．客户端触发中断当前任务线程：
import com.today.api.financereport.scala.response.ServiceResponse
import com.today.service.commons.Action
import com.today.service.financereport.action.sql.ExportReportRecordActionSql
import com.today.service.financereport.common.ReportThreadManager
/**
* 类功能描述：报表删除Action
*
* @author WangXueXing create at 18-11-2 下午2:17
* @version 1.0.0
*/
class DeleteExportReportAction(id: Long) extends Action[ServiceResponse]{
override def preCheck: Unit = {}
override def action: ServiceResponse = {
val result = ExportReportRecordActionSql.deleteExportReportById(id)
result match {
case 0 => ServiceResponse("501","删除报表失败")
case _ => {
//删除报表的同时结束生成报表线程
new Thread(new Runnable {
/**
* 延迟退出系统
*/
override def run(): Unit = {
Thread.sleep(50)
ReportThreadManager.deploy(id)
}
}).start()
ServiceResponse("200","success")
}
}
}
}
每天一点成长，欢迎指正！
