1 files changed, 74 insertions, 0 deletions
diff --git a/sources/hv-collector-dcae-app-simulator/src/main/kotlin/org/onap/dcae/collectors/veshv/simulators/dcaeapp/impl/DcaeAppSimulator.kt b/sources/hv-collector-dcae-app-simulator/src/main/kotlin/org/onap/dcae/collectors/veshv/simulators/dcaeapp/impl/DcaeAppSimulator.kt
new file mode 100644
index 00000000..490cde4a
--- /dev/null
+++ b/sources/hv-collector-dcae-app-simulator/src/main/kotlin/org/onap/dcae/collectors/veshv/simulators/dcaeapp/impl/DcaeAppSimulator.kt
@@ -0,0 +1,74 @@
+/*
+ * ============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.simulators.dcaeapp.impl
+
+import arrow.core.getOrElse
+import arrow.effects.IO
+import arrow.effects.fix
+import arrow.effects.instances.io.monadError.monadError
+import arrow.typeclasses.bindingCatch
+import org.onap.dcae.collectors.veshv.utils.arrow.getOption
+import org.onap.dcae.collectors.veshv.utils.logging.Logger
+import java.io.InputStream
+import java.util.concurrent.atomic.AtomicReference
+
+/**
+ * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
+ * @since August 2018
+ */
+class DcaeAppSimulator(private val consumerFactory: ConsumerFactory,
+                       private val messageStreamValidation: MessageStreamValidation) {
+    private val consumerState: AtomicReference<ConsumerStateProvider> = AtomicReference()
+
+    fun listenToTopics(topicsString: String) = listenToTopics(extractTopics(topicsString))
+
+    fun listenToTopics(topics: Set<String>): IO<Unit> = IO.monadError().bindingCatch {
+        if (topics.any { it.isBlank() })
+            throw IllegalArgumentException("Topic list cannot contain empty elements")
+        if (topics.isEmpty())
+            throw IllegalArgumentException("Topic list cannot be empty")
+
+        logger.info("Received new configuration. Creating consumer for topics: $topics")
+        consumerState.set(consumerFactory.createConsumerForTopics(topics).bind())
+    }.fix()
+
+    fun state() = consumerState.getOption().map { it.currentState() }
+
+    fun resetState(): IO<Unit> = consumerState.getOption().fold(
+            { IO.unit },
+            { it.reset() }
+    )
+
+    fun validate(jsonDescription: InputStream) = messageStreamValidation.validate(jsonDescription, currentMessages())
+
+    private fun currentMessages(): List<ByteArray> =
+            consumerState.getOption()
+                    .map { it.currentState().consumedMessages }
+                    .getOrElse(::emptyList)
+
+    private fun extractTopics(topicsString: String): Set<String> =
+            topicsString.substringAfter("=")
+                    .split(",")
+                    .toSet()
+
+    companion object {
+        private val logger = Logger(DcaeAppSimulator::class)
+    }
+}