当出现异常时,我将对象发送到服务器(顺序大约为 90 个),例如端点关闭,Logback 触发自定义 STMP appender,它只发送 1 封电子邮件,最大值为 1。 10 个日志,然后有延迟,其他日志被发送。 start()
是否有可能被过于频繁地调用?
问题:
scheduler.scheduleAtFixedRate(this::sendEmail, 1, 1L, TimeUnit.HOURS);
执行一次后不延迟,直接执行下一次,很多邮件不到一个小时就发完了。
我必须更改什么才能使调度程序的延迟生效?
After debugging I notices that
Attaching appender named [EMAIL] to Logger[ROOT]
occured two times could that be the problem, if yes how can I fix that?
Logback.xml 配置:
<configuration debug="true">
<!-- Logging per console and per email -->
<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
<layout class="ch.qos.logback.classic.PatternLayout">
<Pattern>
<!-- sets the format of the output -->
%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n
</Pattern>
</layout>
</appender>
<appender name="EMAIL" class="com.konverto.phonebillasaj.appenders.ScheduledSMTPAppender">
<subject>TESTING: %logger{20} - %m</subject>
<layout class="ch.qos.logback.classic.html.HTMLLayout" />
<smtpHost>smtp.xxx.net</smtpHost>
<smtpPort>587</smtpPort>
<STARTTLS>true</STARTTLS>
<username>xxx@domain.net</username>
<password>myPass</password>
<to>yyy@domain.net</to>
<from>xxx@domain.net</from>
<maxMessages>10</maxMessages>
<!-- for testing , comment in production, default 256 -->
<cyclicBufferTracker class="ch.qos.logback.core.spi.CyclicBufferTracker">
<!-- Send just one log entry per email, ready for a lot of emails if you put one. -->
<bufferSize>1</bufferSize>
</cyclicBufferTracker>
<!-- for testing , comment in production, default asynchronousSending = true -->
<asynchronousSending>false</asynchronousSending>
</appender>
<logger name="com.konverto.phonebillasaj" level="error" additivity="false">
<appender-ref ref="EMAIL"/>
<appender-ref ref="CONSOLE" />
</logger>
<root level="error">
<appender-ref ref="EMAIL" />
<appender-ref ref="CONSOLE" />
</root>
appender的代码:
public class ScheduledSMTPAppender extends SMTPAppender {
private final ThreadFactory tf = r -> {
Thread t = new Thread(r, "ScheduledSMTPAppender Thread");
t.setDaemon(true); //make daemon or it will prevent your program to exit
return t;
};
private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1, tf);
private final List<ILoggingEvent> events = new ArrayList<>();
private int maxMessages = 10;
public ScheduledSMTPAppender() {
super();
}
public ScheduledSMTPAppender(EventEvaluator<ILoggingEvent> eventEvaluator) {
super(eventEvaluator);
}
@Override public void start() {
super.start();
scheduler.scheduleAtFixedRate(this::sendEmail, 1, 1L, TimeUnit.HOURS);
}
@Override protected void sendBuffer(CyclicBuffer<ILoggingEvent> cb, ILoggingEvent lastEventObject) {
events.add(lastEventObject);
if (events.size() > maxMessages)
{
sendEmail();
}
}
//needs to be synchronized for thread safety
private synchronized void sendEmail() {
try {
if (events.isEmpty()){
return;
}
ILoggingEvent lastEvent = events.get(events.size() - 1);
events.remove(events.size() - 1);
CyclicBuffer<ILoggingEvent> cb;
if (events.isEmpty()) {
cb = new CyclicBuffer<>(1);
} else {
cb = new CyclicBuffer<>(events.size());
for (ILoggingEvent e : events){
cb.add(e);
}
}
super.sendBuffer(cb, lastEvent);
events.clear();
} catch (Exception e) {
//Important to have a catch all here or the scheduled task will die
addError("Error occurred while sending e-mail notification.", e);
}
}
//this allows to make "maxMessages" a parameter of your appender
public int getMaxMessages() {
return maxMessages;
}
public String getContentType() {
return layout.getContentType();
}
public void setMaxMessages(int maxMessages) {
this.maxMessages = maxMessages;
}
最佳答案
好像是这个问题
@Override
public void start() {
super.start();
scheduler.scheduleAtFixedRate(this::sendEmail, 1, 1L, TimeUnit.HOURS);
}
此调度程序将为每个初始化的附加程序排队发送电子邮件任务。 您能否在每条日志行中记录对象的实例或某个 id,并且每次都调用 start ?这应该可以阐明场景。
需要说明的是——我尝试使用 Sysout 而不是记录器(并在 main 方法中初始化)来编写相同的代码,并且它按预期工作。这是代码
public class ScheduledSMTPAppender /*extends SMTPAppender*/ {
private static final ThreadFactory tf = r -> {
Thread t = new Thread(r, "ScheduledSMTPAppender Thread");
t.setDaemon(true); //make daemon or it will prevent your program to exit
return t;
};
private static final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1, tf);
private final List<String> events = new ArrayList<>();
private int maxMessages = 10;
public static void main(String args[]) {
ScheduledSMTPAppender app = new ScheduledSMTPAppender();
System.out.println("started");
Thread t = new Thread(() -> {
try {
scheduler.awaitTermination(1, TimeUnit.HOURS);
} catch (Exception e) {
}
});
System.out.println("awaiting termination");
t.start();
System.out.println("thread initiated");
new Thread(() -> {
// Thread to add events to check logs
for (int i =0;i<10;i++)
{app.addEvent("asd");
try {Thread.sleep(1000);
} catch(Exception e) {};}
}).start();
}
public ScheduledSMTPAppender() {
super();
System.out.println("starting");
scheduler.scheduleAtFixedRate(this::sendEmail, 1, 1L, TimeUnit.SECONDS);
}
/*
public ScheduledSMTPAppender(EventEvaluator<String> eventEvaluator) {
super(eventEvaluator);
}
@Override
public void start() {
super.start();
scheduler.scheduleAtFixedRate(this::sendEmail, 1, 1L, TimeUnit.HOURS);
}*/
//@Override
protected void sendBuffer(List<String> cb, String lastEventObject) {
//System.out.println("sending email");
events.add(lastEventObject);
if (events.size() > maxMessages) {
sendEmail();
}
System.out.println(new Date() + "sent email" + lastEventObject);
}
//needs to be synchronized for thread safety
private synchronized void sendEmail() {
try {
if (events.isEmpty()) {
return;
}
String lastEvent = events.get(events.size() - 1);
events.remove(events.size() - 1);
List<String> cb;
if (events.isEmpty()) {
cb = new ArrayList<>(1);
} else {
cb = new ArrayList<>(events.size());
for (String e : events) {
cb.add(e);
}
}
sendBuffer(cb, lastEvent);
events.clear();
} catch (Exception e) {
//Important to have a catch all here or the scheduled task will die
//addError("Error occurred while sending e-mail notification.", e);
}
}
//this allows to make "maxMessages" a parameter of your appender
public int getMaxMessages() {
return maxMessages;
}
// public String getContentType() {
// return layout.getContentType();
// }
public void setMaxMessages(int maxMessages) {
this.maxMessages = maxMessages;
}
public void addEvent(String s) {
events.add(s);
}
}
关于java - 自定义 SMTPAppender 中的 scheduleAtFixedRate 不会延迟,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57216073/