Timed task framework

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Catalog

summary

The framework of timed tasks is also a very common requirement .

demand ：

1. Timer selection

Design thinking

The simplest timers are ：
Use cron Expression processing

Analysis of implementation ideas

1.corn expression

This is the most common use , It's me, too 14 Annual contact ｃｏｓｐ　 When , Accomplished .
second minute Hours Japan month
week year
Mainly ｃｏｒｎ　 Use of expressions

2. Database style timer

The expression of database timer is encapsulated inside , 了

quartzs

adopt job To complete the timer setting , Also in 2015 Encountered in .
Defining triggers Trigger And with job binding

@Scheduled Annotation is the simplest way , Just enable the timer , Just add comments on the method .

stay spring Add... To the configuration ：

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<task:annotation-driven />
Add notes to the specific methods to be used @Scheduled

@Scheduled(cron = "0 0 * * * ? ")
public void myTask(){
// Timing task …
}

timer scher:

Use Timer Of schedule,schedule Yes 3 Parameters ：

schedule(TimerTask task, long delay, long period)
The first is a scheduled task , Rewrite according to business needs TimerTask Of run The method can ;

The second is delayed start , Unit millisecond ;

How often does the third bit run , Unit millisecond ;

Using threads ：

Using threads to control is more flexible , You can judge when to run according to your own needs , When to stop , It needs to be right java Have a certain understanding of threads .

Expand to achieve

Reference here ：github: Simply implement the above process ：
Entry level implementation :
: Partial source code implementation .
: The source code to achieve

Performance parameter test ：

nothing

References and recommended readings

1. Recommended reading .

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