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153 lines
3.5 KiB
Markdown
153 lines
3.5 KiB
Markdown
# krontab
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[  ](https://bintray.com/insanusmokrassar/InsanusMokrassar/krontab/_latestVersion)
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Library was created to give oppotunity to launch some things from time to time according to some schedule in
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runtime of applications.
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| Table of content |
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| [ How to use ](#how-to-use) |
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| [ How to use: Including in project ](#including-in-project) |
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| [ How to use: Config from string ](#config-from-string) |
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| [ How to use: Config via builder (DSL preview) ](#config-via-builder) |
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| [ How to use: KronScheduler as a Flow ](#KronScheduler-as-a-Flow) |
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## How to use
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There are several ways to configure and use this library:
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* From some string
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* From builder
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Anyway, to start some action from time to time you will need to use one of extensions/functions:
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```kotlin
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val kronScheduler = /* creating of KronScheduler instance */;
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kronScheuler.doWhile {
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// some action
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true // true - repeat on next time
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}
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```
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### Including in project
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If you want to include `krontab` in your project, just add next line to your
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dependencies part:
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```groovy
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implementation "com.insanusmokrassar:krontab:$krontab_version"
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```
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Next version is the latest currently for the library:
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[  ](https://bintray.com/insanusmokrassar/InsanusMokrassar/krontab/_latestVersion)
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For old version of Gradle, instead of `implementation` word developers must use `compile`.
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### Config from string
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Developers can use more simple way to configure repeat times is string. String configuring
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like a `crontab`, but with a little bit different meanings:
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```
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/-------- Seconds
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| /------ Minutes
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| | /---- Hours
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| | | /-- Days of months
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| | | | / Months
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* * * * *
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```
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It is different with original `crontab` syntax for the reason, that expected that in practice developers
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will use seconds and minutes with more probability than months (for example). In fact, developers will use something
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like:
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```kotlin
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doWhile("/5 * * * *") {
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println("Called")
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true // true - repeat on next time
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}
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```
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Or more version:
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```kotlin
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doInfinity("/5 * * * *") {
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println("Called")
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}
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```
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Both of examples will print `Called` message every five seconds.
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### Config via builder
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Also this library currently supports DSL for creating the same goals:
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```kotlin
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val kronScheduler = buildSchedule {
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seconds {
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from (0) every 5
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}
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}
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kronScheduler.doWhile {
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println("Called")
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true // true - repeat on next time
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}
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```
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Or
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```kotlin
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val kronScheduler = buildSchedule {
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seconds {
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0 every 5
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}
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}
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kronScheduler.doWhile {
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println("Called")
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true // true - repeat on next time
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}
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```
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Or
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```kotlin
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val kronScheduler = buildSchedule {
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seconds {
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0 every 5
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}
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}
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kronScheduler.doInfinity {
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println("Called")
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}
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```
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All of these examples will do the same things: print `Called` message every five seconds.
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### KronScheduler as a Flow
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Any `KronScheduler`can e converted to a `Flow<DateTime` using extension `asFlow`:
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```kotlin
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val kronScheduler = buildSchedule {
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seconds {
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0 every 1
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}
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}
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val flow = kronScheduler.asFlow()
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```
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So, in this case any operations related to flow are available and it is expected tt th will work correctly. For example,
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it is possible to use this flow with `takeWhile`:
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```kotlin
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flow.takeWhile {
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condition()
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}.collect {
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action()
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}
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```
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