retry機能着きLoan pattern
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scala> def retry[T](p: => Boolean)(f: => T):T = | |
| try{ f } catch { case e => if(p) retry(p)(f) else throw e } | |
retry: [T](p: => Boolean)(f: => T)T | |
scala> retry( util.Random.nextInt(3) == 0 ){ println("trying..."); "a".toInt } | |
trying... | |
java.lang.NumberFormatException: For input string: "a" | |
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48) | |
at java.lang.Integer.parseInt(Integer.java:449) | |
at java.lang.Integer.parseInt(Integer.java:499) | |
at scala.collection.immutable.StringLike$class.toInt(StringLike.scala:231) | |
at scala.collection.immutable.StringOps.toInt(StringOps.scala:31) | |
at $anonfun$2.apply$mcI$sp(<console>:13) | |
at $anonfun$2.apply(<console>:13) | |
at $anonfun$2.apply(<console>:13) | |
at .retry(<console>:13) | |
at .<init>(<console>:13) | |
at .<clinit>(<console>) | |
at .<init>(<console>:11) | |
at .<clinit>(<console>) | |
at $export(<console>) | |
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) | |
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) | |
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) | |
at java.lang.reflect.Method.invoke(Method.java:597) | |
at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:592) | |
at scala.tools.nsc.interpreter.IMain$Request$$anonfun$10.apply(IMain.scala:828) | |
at scala.tools.nsc.interpreter.Line$$anonfun$1.apply$mcV$sp(Line.scala:43) | |
at scala.tools.nsc.io.package$$anon$2.run(package.scala:31) | |
at java.lang.Thread.run(Thread.java:680) |
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