<span style="color:rgb(51,51,51); font-family:Helvetica,Tahoma,Arial,sans-serif; font-size:14px; line-height:24px; background-color:rgb(245,245,245)">1.不停的轮询(while)，直到收到停止任务的要求</span>
<br style="color:rgb(51,51,51); font-family:Helvetica,Tahoma,Arial,sans-serif; font-size:14px; line-height:24px; background-color:rgb(245,245,245)">
<span style="color:rgb(51,51,51); font-family:Helvetica,Tahoma,Arial,sans-serif; font-size:14px; line-height:24px; background-color:rgb(245,245,245)">2.算出下次触发的时间，比如是 09:10:00 ，减去当前时间 09:00:00 ，也就是还有10分钟才会触发下次任务。那就wait 10分钟</span>
<br style="color:rgb(51,51,51); font-family:Helvetica,Tahoma,Arial,sans-serif; font-size:14px; line-height:24px; background-color:rgb(245,245,245)">
<span style="color:rgb(51,51,51); font-family:Helvetica,Tahoma,Arial,sans-serif; font-size:14px; line-height:24px; background-color:rgb(245,245,245)">p.s. 最近刚好在看quartz的源码，还是比较容易看懂，建议你也好好看看</span>
<br style="color:rgb(51,51,51); font-family:Helvetica,Tahoma,Arial,sans-serif; font-size:14px; line-height:24px; background-color:rgb(245,245,245)">
<p><span style="color:rgb(51,51,51); font-family:Helvetica,Tahoma,Arial,sans-serif; font-size:14px; line-height:24px; background-color:rgb(245,245,245)">QuartzSchedulerThread.class</span></p>
<p><span style="color:rgb(51,51,51); font-family:Helvetica,Tahoma,Arial,sans-serif; font-size:14px; line-height:24px; background-color:rgb(245,245,245)"></span></p>
<pre class="blockcode"><code class="language-java"> triggerTime = triggers.get(0).getNextFireTime().getTime();
long timeUntilTrigger = triggerTime - now;
while(timeUntilTrigger > 2) {
synchronized (sigLock) {
if (halted.get()) {
break;
}
if (!isCandidateNewTimeEarlierWithinReason(triggerTime, false)) {
try {
// we could have blocked a long while
// on 'synchronize', so we must recompute
now = System.currentTimeMillis();
timeUntilTrigger = triggerTime - now;//下次触发时间-当前时间
if(timeUntilTrigger >= 1)
sigLock.wait(timeUntilTrigger);//这里是关键，等待时间为 下次触发时间-当前时间
} catch (InterruptedException ignore) {
}
}
}
if(releaseIfScheduleChangedSignificantly(triggers, triggerTime)) {
break;
}
now = System.currentTimeMillis();
timeUntilTrigger = triggerTime - now;
}</code></pre>
<br>
<br>
<p></p>
<p style="margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; color:rgb(85,85,85); font-family:'microsoft yahei'; font-size:15px; line-height:35px"> <span style="font-family:'Microsoft YaHei'; font-size:18px">从线程开始， 我们来看下QuartzSchedulerThread类(负责执行触发的Trigger的工作) : </span></p>
<p style="margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; color:rgb(85,85,85); font-family:'microsoft yahei'; font-size:15px; line-height:35px"> </p>
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