Vikas Hazrati vhazrati
vhazrati
/ JavaNullHandler
Created
January 21, 2015 15:29
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| object play { | |
| println("Welcome to the Scala worksheet") | |
| case class User(id:Int, name:String) | |
| def getUser:User = null | |
| def processUser(u:User):String= u.name | |
| Option(getUser) | |
| Option(getUser).fold("Sky")(u=>processUser(u)) | |
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| object OptionPlay { | |
| println("Welcome to the Scala worksheet") | |
| def someCrappyJavaService = null | |
| val result: Option[String] = Some("Hello") | |
| def someProcessingLogic(x: String) = println(s"I would execute when there is some value like $x") | |
| def opSomeProcessingLogic(x: String): Option[String] = { println(s"I would execute when there is some value like $x"); Some("Some String") } | |
| //Standard Way | |
| if (result != None) someProcessingLogic(result.get) | |
| if (result.isDefined) someProcessingLogic(result.get) |
vhazrati
/ Scala Idiomatic Error Handling
Created
April 10, 2014 19:09
Scala Idiomatic Error Handling
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| def sayHello(any: Any): Try[String] = { | |
| Try { | |
| any match { | |
| case x: String => "Hello" | |
| case _ => throw new Exception("Huh!") | |
| } | |
| } | |
| } //> sayHello: (any: Any)scala.util.Try[String] | |
| def letMeSayHello = { |
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| /room/classroom),,true,false), , GetRequest, Empty) | |
| java.lang.NullPointerException: null | |
| at net.liftweb.mongodb.record.field.JsonObjectField.asJValue(JsonObjectField.scala:45) ~[lift-mongodb-record_2.9.0-1-2.4.jar:2.4] | |
| at net.liftweb.record.MetaRecord$$anonfun$asJValue$1.apply(MetaRecord.scala:274) ~[lift-record_2.9.0-1-2.4.jar:2.4] | |
| at net.liftweb.record.MetaRecord$$anonfun$asJValue$1.apply(MetaRecord.scala:274) ~[lift-record_2.9.0-1-2.4.jar:2.4] | |
| at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:194) ~[scala-library.jar:na] | |
| at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:194) ~[scala-library.jar:na] | |
| at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59) ~[scala-library.jar:na] | |
| at scala.collection.immutable.List.foreach(List.scala:45) ~[scala-library.jar:na] | |
| at scala.collection.TraversableLike$class.map(TraversableLike.scala:194) ~[scala-library.jar:na] |
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| package login | |
| import net.liftweb.http.LiftRules | |
| import net.liftweb.http.Req | |
| import net.liftweb.http.GetRequest | |
| import net.liftweb.http.S | |
| import net.liftweb.common.Box | |
| import net.liftweb.http.LiftResponse | |
| import net.liftweb.util.Props | |
| import net.liftweb.common.Full | |
| import net.liftweb.common.Empty |
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| package login | |
| import net.liftweb.http.LiftRules | |
| import net.liftweb.http.Req | |
| import net.liftweb.http.GetRequest | |
| import twitter4j.TwitterException | |
| import twitter4j.TwitterFactory | |
| import net.liftweb.http.S | |
| import net.liftweb.common.Box | |
| import net.liftweb.http.LiftResponse | |
| import net.liftweb.util.Props |
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| import org.scalatest.FunSuite | |
| import com.novus.salat.annotations.Key | |
| import org.bson.types.ObjectId | |
| import org.specs2.specification.BeforeAfter | |
| import org.scalatest.BeforeAndAfter | |
| import com.novus.salat.dao.SalatDAO | |
| import com.mongodb.casbah.MongoConnection | |
| import org.junit.runner.RunWith | |
| import org.scalatest.junit.JUnitRunner | |
| //import com.novus.salat.global._ |
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| import org.scalatest.FunSuite | |
| import com.novus.salat.annotations.raw.Key | |
| import org.bson.types.ObjectId | |
| import org.specs2.specification.BeforeAfter | |
| import org.scalatest.BeforeAndAfter | |
| import com.novus.salat.dao.SalatDAO | |
| import com.mongodb.casbah.MongoConnection | |
| import org.junit.runner.RunWith | |
| import org.scalatest.junit.JUnitRunner | |
| import com.novus.salat.global._ |
vhazrati
/ PullApplicationActorLess.scala
Created
December 21, 2011 11:30
Code changed as per Viktors recommendations
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| object PullApplicationActorLess extends App { | |
| var context: ZMQ.Context = null | |
| var pullSocket: ZMQ.Socket = null | |
| context = ZMQ.context(5) | |
| pullSocket = context.socket(ZMQ.PULL) | |
| pullSocket.connect("tcp://127.0.0.1:5555") | |
| println("Starting consumer ...") |
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| object PullApplicationActorLess extends App { | |
| val TOTAL_MESSAGES = 1000000 | |
| val diagnostics = actorOf(new Diagnostics.DiagnosticsActor).start | |
| var context: ZMQ.Context = null | |
| var pullSocket: ZMQ.Socket = null | |
| context = ZMQ.context(1) | |
| pullSocket = context.socket(ZMQ.PULL) | |
| pullSocket.connect("tcp://127.0.0.1:5555") |