Github user nikste commented on a diff in the pull request:
https://github.com/apache/flink/pull/1106#discussion_r41525031
--- Diff:
flink-staging/flink-scala-shell/src/test/scala/org/apache/flink/api/scala/ScalaShellITSuite.scala
---
@@ -225,8 +223,50 @@ class ScalaShellITSuite extends FunSuite with Matchers
with BeforeAndAfterAll {
out.toString + stdout
}
- var cluster: Option[ForkableFlinkMiniCluster] = None
- val parallelism = 4
+ /**
+ * tests flink shell startup with remote cluster (starts cluster
internally)
+ */
+ test("start flink scala shell with remote cluster") {
+
+ val input: String = "val els = env.fromElements(\"a\",\"b\");\n" +
+ "els.print\nError\n:q\n"
+
+ val in: BufferedReader = new BufferedReader(
+ new StringReader(
+ input + "\n"))
+ val out: StringWriter = new StringWriter
+
+ val baos: ByteArrayOutputStream = new ByteArrayOutputStream
+ val oldOut: PrintStream = System.out
+ System.setOut(new PrintStream(baos))
+
+ val (c, args) = cluster match{
+ case Some(cl) =>
+ val arg = Array("remote",
+ cl.hostname,
+ Integer.toString(cl.getLeaderRPCPort))
+ (cl, arg)
+ case None =>
+ fail("Cluster creation failed!")
+ }
+
+ //start scala shell with initialized
+ // buffered reader for testing
+ FlinkShell.bufferedReader = Some(in)
+ FlinkShell.main(args)
+ baos.flush
--- End diff --
Actually the official reasoning is if it has some "side-effects" it should
have some parenthesis (which it does in this case)
http://docs.scala-lang.org/style/method-invocation.html
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