在公司里面用java实现了一个RetryTemplate的模板,可能spring里面已经实现了,但是用scala实现了一个很简单的,就当作学习吧。
下面是RetryTemplate.scala
class RetryTemplate(c: Int, d: Long) {
require(c > 0 && d > 0)
val count = c
val delay = d
def this() {
this(10, 500)
}
def retryOperation(action: () => Unit): Unit = {
def wrapAction(): Boolean = {
action()
true
}
this.retryOperation(classOf[Boolean], wrapAction)
}
def retryOperation[T <: Any](returnType: Class[T], action: () => T): T = {
//scala里面的变量初始化真是坑跌。
var exception: Throwable = null.asInstanceOf[Throwable]
var result: T = null.asInstanceOf[T]
//scala里面没有break判断,直接return又会报ReturnNotControl的exception.
(1 to count).toStream.takeWhile(i => !exception.isInstanceOf[FinishStatus]).foreach {
_ =>
try {
result = action()
exception = new FinishStatus
} catch {
case ex: Throwable => {
exception = ex
delayTime
}
}
}
if (exception.isInstanceOf[FinishStatus]) {
result
} else {
Console.println("retry attempt max times, finish retry.")
throw exception
}
}
def delayTime(): Unit = {
Thread.sleep(delay);
}
}
private class FinishStatus extends Throwable with NoStackTrace
下面是测试代码
class HelloworldModule extends RetryTemplate {
def sayHello() = {
Console.println("sayHello")
//throw new IllegalStateException
}
}
object TestReretyTemplate {
def main(args: Array[String]) {
val helloworldModule = new HelloworldModule
helloworldModule.retryOperation(helloworldModule.sayHello)
}
}
希望对scala有更深理解的童鞋能够更好的实现。
分享到:
相关推荐
赠送jar包:scala-compiler-2.11.8.jar; 赠送原API文档:scala-compiler-2.11.8-javadoc.jar; 赠送源代码:scala-compiler-2.11.8-sources.jar; 赠送Maven依赖信息文件:scala-compiler-2.11.8.pom; 包含翻译后...
赠送jar包:scala-parser-combinators_2.11-1.0.4.jar; 赠送原API文档:scala-parser-combinators_2.11-1.0.4-javadoc.jar; 赠送源代码:scala-parser-combinators_2.11-1.0.4-sources.jar; 赠送Maven依赖信息...
赠送jar包:scala-java8-compat_2.11-0.7.0.jar; 赠送原API文档:scala-java8-compat_2.11-0.7.0-javadoc.jar; 赠送源代码:scala-java8-compat_2.11-0.7.0-sources.jar; 赠送Maven依赖信息文件:scala-java8-...
赠送jar包:scala-xml_2.12-1.0.6.jar; 赠送原API文档:scala-xml_2.12-1.0.6-javadoc.jar; 赠送源代码:scala-xml_2.12-1.0.6-sources.jar; 赠送Maven依赖信息文件:scala-xml_2.12-1.0.6.pom; 包含翻译后的API...
赠送jar包:scala-xml_2.11-1.0.4.jar; 赠送原API文档:scala-xml_2.11-1.0.4-javadoc.jar; 赠送源代码:scala-xml_2.11-1.0.4-sources.jar; 赠送Maven依赖信息文件:scala-xml_2.11-1.0.4.pom; 包含翻译后的API...
赠送jar包:scala-parser-combinators_2.11-1.0.4.jar; 赠送原API文档:scala-parser-combinators_2.11-1.0.4-javadoc.jar; 赠送源代码:scala-parser-combinators_2.11-1.0.4-sources.jar; 包含翻译后的API...
赠送jar包:scala-compiler-2.11.12.jar; 赠送原API文档:scala-compiler-2.11.12-javadoc.jar; 赠送源代码:scala-compiler-2.11.12-sources.jar; 赠送Maven依赖信息文件:scala-compiler-2.11.12.pom; 包含...
IntellJIDEA Scala插件:scala-intellij-bin-2016.3.9
赠送jar包:scala-parser-combinators_2.12-1.1.0.jar; 赠送原API文档:scala-parser-combinators_2.12-1.1.0-javadoc.jar; 赠送源代码:scala-parser-combinators_2.12-1.1.0-sources.jar; 赠送Maven依赖信息...
windows版本 scala-2.12.14.zip & Linux版本 scala-2.12.11.tgz 压缩包.rar
scala eclipse插件.对应scala版本:2.10--2.11,对应eclipes版本:4.4--...update site:http://download.scala-ide.org/sdk/lithium/e44/scala211/stable/site 下载地址:http://scala-ide.org/download/current.html
赠送jar包:scala-compiler-2.11.0.jar; 赠送原API文档:scala-compiler-2.11.0-javadoc.jar; 赠送源代码:scala-compiler-2.11.0-sources.jar; 赠送Maven依赖信息文件:scala-compiler-2.11.0.pom; 包含翻译后...
赠送jar包:scala-xml_2.11-1.0.5.jar; 赠送原API文档:scala-xml_2.11-1.0.5-javadoc.jar; 赠送源代码:scala-xml_2.11-1.0.5-sources.jar; 赠送Maven依赖信息文件:scala-xml_2.11-1.0.5.pom; 包含翻译后的API...
赠送jar包:scala-compiler-2.12.7.jar; 赠送原API文档:scala-compiler-2.12.7-javadoc.jar; 赠送源代码:scala-compiler-2.12.7-sources.jar; 赠送Maven依赖信息文件:scala-compiler-2.12.7.pom; 包含翻译后...
赠送jar包:scala-compiler-2.12.7.jar; 赠送原API文档:scala-compiler-2.12.7-javadoc.jar; 赠送源代码:scala-compiler-2.12.7-sources.jar; 赠送Maven依赖信息文件:scala-compiler-2.12.7.pom; 包含翻译后...
赠送jar包:scala-reflect-2.11.8.jar; 赠送原API文档:scala-reflect-2.11.8-javadoc.jar; 赠送源代码:scala-reflect-2.11.8-sources.jar; 赠送Maven依赖信息文件:scala-reflect-2.11.8.pom; 包含翻译后的API...
赠送jar包:scala-compiler-2.11.0.jar; 赠送原API文档:scala-compiler-2.11.0-javadoc.jar; 赠送源代码:scala-compiler-2.11.0-sources.jar; 赠送Maven依赖信息文件:scala-compiler-2.11.0.pom; 包含翻译后...
scala-compiler.jar
scala-intellij-bin-2021.3.6.zip
赠送jar包:scala-parser-combinators_2.12-1.1.0.jar; 赠送原API文档:scala-parser-combinators_2.12-1.1.0-javadoc.jar; 赠送源代码:scala-parser-combinators_2.12-1.1.0-sources.jar; 赠送Maven依赖信息...