类Tap需要类型参数

Question

Scala noob here.

I'm integrating a webcrawler that uses cascading internally ( bixo ). So i've been investing some time in porting an example they provide ( see here ) line by line.

So far I'm making little progress, and one thing I'm stuck with is at the sinkMap , basically a Map of cascading Tap s.

I written that line as:

val sinkMap: Map[String, Tap] = Map[String, Tap]()

and that particular line is throwing me

[ant:scalac] /home/matias/.../Crawler.scala:18: error: class Tap takes type parameters
[ant:scalac]     val sinkMap: Map[String, Tap] = Map[String, Tap]()
[ant:scalac]                              ^
[ant:scalac] /home/matias/.../Crawler.scala:18: error: class Tap takes type parameters
[ant:scalac]     val sinkMap: Map[String, Tap] = Map[String, Tap]()
[ant:scalac]                                                 ^

I programming by coincidence here. But I'm certain the above code should work as I expect...

Any pointer is welcome.

Answer 1

According to the documentation the Tap class requires three type parameters, so you need to specify them in your map type.

eg Map[String, Tap[Scheme, BasePath, SinkMode]]