SRPING:定时器并发问题
SRPING:定时器并发问题
PUSH_BIRTH_MSG_TEST表status=’1’的数据共19条
SQL> select ID, USER_ID, STATUS
2 from PUSH_BIRTH_MSG_TEST
3 where STATUS = '1'
4 order by ID
5 fetch next 50 rows only
6 /
ID USER_ID STATUS
----------- ----------- ------
6500 928645922 1
6501 928645922 1
6502 928645922 1
6503 928645922 1
6504 928645922 1
6505 928645922 1
6506 928645922 1
6507 928645922 1
6508 928645922 1
6510 928651342 1
6511 928651342 1
6512 928651342 1
6513 928649088 1
6514 928652889 1
6515 928652889 1
6516 928652889 1
6517 928652889 1
6519 928652889 1
6520 928652889 1
19 rows selectedcount.txt
SendSmsBirthJob.java
package com.edai.job;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import com.edai.service.SendSMSService;
@Component(value = "sendSmsBirth")
public class SendSmsBirthJob {
@Autowired(required = true)
private SendSMSService sendSMSService;
public void executeTask() throws IOException {
System.out.println("==============================================");
long start = System.currentTimeMillis();
File file = new File("c:" + File.separator + "learning" + File.separator + "count.txt");
InputStream input = null;
input = new FileInputStream(file) ;
byte b[] = new byte[1024];
int len = 0;
int line = 0;
while((line=input.read())!=-1){
b[len] = (byte)line ;
len++ ;
}
input.close() ;
String result = new String(b,0,len);
System.out.println("读取文件: 总共" + result+"条数据。");
OutputStream output = null;
output = new FileOutputStream(file) ;
List> listMap = sendSMSService.queryAllSms();
for (int i = 0; i < listMap.size(); i++) {
Map map = listMap.get(i);
System.out.println(map.get("ID") + "||" + map.get("USER_ID") + "||" + map.get("STATUS"));
}
int listSize = listMap.size();
result = String.valueOf(Integer.parseInt(result) + listSize);
System.out.println("count.txt content output: " + result);
b = result.getBytes();
output.write(b, 0, b.length);
output.flush();
output.close();
try {
Thread.currentThread().sleep(1000);
} catch (InterruptedException e) {
}
sendSMSService.updateBatchBirthMess();
long end = System.currentTimeMillis();
System.out.println("执行时间："+(end-start)+"毫秒。");
System.out.println("==============================================");
}
}
以上逻辑，取得status=1的记录总数，更新到count.txt中。
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
">
<description>quartz配置文件description>
<bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean"
lazy-init="true">
<property name="triggers">
<list>
<ref bean="sendBirthSmsTaskTrigger"/>
list>
property>
bean>
<bean id="sendBirthSmsTaskTrigger"
class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
<property name="jobDetail">
<ref bean="sendBirthSms" />
property>
<property name="cronExpression">
<value>0/1 * * * * ?value>
property>
bean>
<bean id="sendBirthSms"
class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
<property name="targetObject" ref="sendSmsBirth" />
<property name="targetMethod" value="executeTask" />
bean>
beans>以上，定时器，0/1 * * * * ?（每秒钟跑一次）
执行结果：
log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/gitworkspaces/springQuartzTest/lib/slf4j-log4j12-1.7.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/gitworkspaces/springQuartzTest/lib/slf4j-simple-1.7.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
==============================================
==============================================
==============================================
==============================================
==============================================
==============================================
6500||928645922||1
6501||928645922||1
6502||928645922||1
6503||928645922||1
6504||928645922||1
6505||928645922||1
6506||928645922||1
6507||928645922||1
6508||928645922||1
6510||928651342||1
6511||928651342||1
6512||928651342||1
6513||928649088||1
6500||928645922||1
6501||928645922||1
6502||928645922||1
6503||928645922||1
6504||928645922||1
6505||928645922||1
6506||928645922||1
6507||928645922||1
6508||928645922||1
6510||928651342||1
6511||928651342||1
6512||928651342||1
6513||928649088||1
6514||928652889||1
6515||928652889||1
6516||928652889||1
6517||928652889||1
6519||928652889||1
6500||928645922||1
6500||928645922||1
6501||928645922||1
6502||928645922||1
6503||928645922||1
6504||928645922||1
6505||928645922||1
6506||928645922||1
6507||928645922||1
6508||928645922||1
6510||928651342||1
6511||928651342||1
6512||928651342||1
6513||928649088||1
6514||928652889||1
6501||928645922||1
6520||928652889||1
6514||928652889||1
6515||928652889||1
6516||928652889||1
6517||928652889||1
6519||928652889||1
6520||928652889||1
6502||928645922||1
6515||928652889||1
6503||928645922||1
6516||928652889||1
6504||928645922||1
6517||928652889||1
6505||928645922||1
6519||928652889||1
6506||928645922||1
6520||928652889||1
6507||928645922||1
6508||928645922||1
count.txt content output: 19
6510||928651342||1
6511||928651342||1
6512||928651342||1
6513||928649088||1
6514||928652889||1
6515||928652889||1
6516||928652889||1
6517||928652889||1
6519||928652889||1
6520||928652889||1
6500||928645922||1
6501||928645922||1
6502||928645922||1
6503||928645922||1
6504||928645922||1
6505||928645922||1
6506||928645922||1
6507||928645922||1
6508||928645922||1
6510||928651342||1
6511||928651342||1
6512||928651342||1
6513||928649088||1
6514||928652889||1
6515||928652889||1
6516||928652889||1
6517||928652889||1
6519||928652889||1
6520||928652889||1
==============================================
6500||928645922||1
6501||928645922||1
6502||928645922||1
6503||928645922||1
6504||928645922||1
6505||928645922||1
6506||928645922||1
6507||928645922||1
6508||928645922||1
6510||928651342||1
6511||928651342||1
6512||928651342||1
6513||928649088||1
6514||928652889||1
6515||928652889||1
6516||928652889||1
6517||928652889||1
6519||928652889||1
6520||928652889||1
count.txt content output: 38
执行时间：5420毫秒，总共更更新了19条数据。
==============================================
==============================================
count.txt content output: 38
执行时间：1095毫秒，总共更更新了38条数据。
==============================================
==============================================
count.txt content output: 38
执行时间：1047毫秒，总共更更新了38条数据。
==============================================
==============================================
count.txt content output: 38
执行时间：1055毫秒，总共更更新了38条数据。
==============================================
==============================================
count.txt content output: 38
执行时间：1100毫秒，总共更更新了38条数据。
==============================================
==============================================
count.txt content output: 38
执行时间：1055毫秒，总共更更新了38条数据。
==============================================
==============================================
count.txt content output: 38
执行时间：1024毫秒，总共更更新了38条数据。
==============================================
结果说明：
应该是抽取状态为1的19条记录，更新19条记录的状态成2，19记录到count.txt，下一次抽取状态为1的记录为0条，count.txt最终还是19。
而以上定时器每秒执行一次，代码逻辑中休眠1秒后再更新状态，所以每次执行超过1秒还没有把状态为1的19条数据更新成2，更新还没有commit完毕，19条记录的状态仍然为1，第二次的任务又开启，再次取得了状态为1的19条数据，导致并发，count.txt变成了38。
解决方案：
id="sendBirthSms"
class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
<property name="targetObject" ref="sendSmsBirth" />
<property name="targetMethod" value="executeTask" />
<property name="concurrent" value="false" />
定时器配置文件，
添加后，运行结果如下：
log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/gitworkspaces/springQuartzTest/lib/slf4j-log4j12-1.7.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/gitworkspaces/springQuartzTest/lib/slf4j-simple-1.7.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
==============================================
6500||928645922||1
6501||928645922||1
6502||928645922||1
6503||928645922||1
6504||928645922||1
6505||928645922||1
6506||928645922||1
6507||928645922||1
6508||928645922||1
6510||928651342||1
6511||928651342||1
6512||928651342||1
6513||928649088||1
6514||928652889||1
6515||928652889||1
6516||928652889||1
6517||928652889||1
6519||928652889||1
6520||928652889||1
count.txt content output: 19
执行时间：1967毫秒，总共更更新了19条数据。
==============================================
==============================================
count.txt content output: 19
执行时间：1049毫秒，总共更更新了19条数据。
==============================================
==============================================
count.txt content output: 19
执行时间：1021毫秒，总共更更新了19条数据。
==============================================
==============================================
count.txt content output: 19
执行时间：1024毫秒，总共更更新了19条数据。
==============================================
==============================================
count.txt content output: 19
执行时间：1035毫秒，总共更更新了19条数据。
==============================================
==============================================