Improve DCAE APP Simulator coverage

Also there was a need to refactor the code, because application logic
was placed inside Ratpack handlers.

Change-Id: Iba3d4d039a98ba88e0dba580c1b7726b53440538
Issue-ID: DCAEGEN2-732
Signed-off-by: Piotr Jaszczyk <piotr.jaszczyk@nokia.com>

3 files changed, 83 insertions, 1 deletions

diff --git a/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/arrow/core.kt b/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/arrow/core.kt
index 39964c1e..844d18d8 100644
--- a/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/arrow/core.kt
+++ b/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/arrow/core.kt
@@ -20,12 +20,15 @@
 package org.onap.dcae.collectors.veshv.utils.arrow
 
 import arrow.core.Either
+import arrow.core.Option
 import arrow.core.identity
+import java.util.concurrent.atomic.AtomicReference
 
 /**
  * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
  * @since July 2018
  */
 
-
 fun <A> Either<A, A>.flatten() = fold(::identity, ::identity)
+
+fun <A> AtomicReference<A>.getOption() = Option.fromNullable(get())
diff --git a/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/arrow/effects.kt b/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/arrow/effects.kt
index e37b0d7d..cef537e8 100644
--- a/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/arrow/effects.kt
+++ b/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/arrow/effects.kt
@@ -20,7 +20,11 @@
 package org.onap.dcae.collectors.veshv.utils.arrow
 
 import arrow.core.Either
+import arrow.core.Left
+import arrow.core.Right
 import arrow.effects.IO
+import reactor.core.publisher.Flux
+import reactor.core.publisher.Mono
 import kotlin.system.exitProcess
 
 /**
@@ -47,3 +51,15 @@ fun Either<IO<Unit>, IO<Unit>>.unsafeRunEitherSync(onError: (Throwable) -> ExitC
 
 
 fun IO<Any>.void() = map { Unit }
+
+fun <T> Mono<T>.asIo() = IO.async<T> { proc ->
+    subscribe({ proc(Right(it)) }, { proc(Left(it)) })
+}
+
+fun <T> Flux<IO<T>>.evaluateIo(): Flux<T> =
+        flatMap { io ->
+            io.attempt().unsafeRunSync().fold(
+                    { Flux.error<T>(it) },
+                    { Flux.just<T>(it) }
+            )
+        }
diff --git a/hv-collector-utils/src/test/kotlin/org/onap/dcae/collectors/veshv/utils/arrow/CoreKtTest.kt b/hv-collector-utils/src/test/kotlin/org/onap/dcae/collectors/veshv/utils/arrow/CoreKtTest.kt
new file mode 100644
index 00000000..585851be
--- /dev/null
+++ b/hv-collector-utils/src/test/kotlin/org/onap/dcae/collectors/veshv/utils/arrow/CoreKtTest.kt
@@ -0,0 +1,63 @@
+/*
+ * ============LICENSE_START=======================================================
+ * dcaegen2-collectors-veshv
+ * ================================================================================
+ * Copyright (C) 2018 NOKIA
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.collectors.veshv.utils.arrow
+
+import arrow.core.None
+import arrow.core.Some
+import org.assertj.core.api.Assertions.assertThat
+import org.jetbrains.spek.api.Spek
+import org.jetbrains.spek.api.dsl.describe
+import org.jetbrains.spek.api.dsl.given
+import org.jetbrains.spek.api.dsl.it
+import org.jetbrains.spek.api.dsl.on
+import java.util.concurrent.atomic.AtomicReference
+
+
+/**
+ * @author Piotr Jaszczyk <piotr.jaszczyk></piotr.jaszczyk>@nokia.com>
+ * @since August 2018
+ */
+internal class CoreKtTest: Spek({
+    describe("AtomicReference.getOption") {
+        given("empty atomic reference") {
+            val atomicReference = AtomicReference<String>()
+
+            on("getOption") {
+                val result = atomicReference.getOption()
+
+                it("should be None") {
+                    assertThat(result).isEqualTo(None)
+                }
+            }
+        }
+        given("non-empty atomic reference") {
+            val initialValue = "reksio"
+            val atomicReference = AtomicReference(initialValue)
+
+            on("getOption") {
+                val result = atomicReference.getOption()
+
+                it("should be Some($initialValue)") {
+                    assertThat(result).isEqualTo(Some(initialValue))
+                }
+            }
+        }
+    }
+})
\ No newline at end of file