1 files changed, 70 insertions, 0 deletions
diff --git a/sources/hv-collector-dcae-app-simulator/src/main/kotlin/org/onap/dcae/collectors/veshv/simulators/dcaeapp/impl/consumer.kt b/sources/hv-collector-dcae-app-simulator/src/main/kotlin/org/onap/dcae/collectors/veshv/simulators/dcaeapp/impl/consumer.kt
new file mode 100644
index 00000000..1eefdbdb
--- /dev/null
+++ b/sources/hv-collector-dcae-app-simulator/src/main/kotlin/org/onap/dcae/collectors/veshv/simulators/dcaeapp/impl/consumer.kt
@@ -0,0 +1,70 @@
+/*
+ * ============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.effects.IO
+import org.onap.dcae.collectors.veshv.simulators.dcaeapp.impl.adapters.KafkaSource
+import org.onap.dcae.collectors.veshv.utils.logging.Logger
+import reactor.kafka.receiver.ReceiverRecord
+import java.util.concurrent.ConcurrentLinkedQueue
+
+/**
+ * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
+ * @since June 2018
+ */
+class ConsumerState(private val messages: ConcurrentLinkedQueue<ByteArray>) {
+    val messagesCount: Int by lazy {
+        messages.size
+    }
+
+    val consumedMessages: List<ByteArray> by lazy {
+        messages.toList()
+    }
+}
+
+interface ConsumerStateProvider {
+    fun currentState(): ConsumerState
+    fun reset(): IO<Unit>
+}
+
+class Consumer : ConsumerStateProvider {
+
+    private var consumedMessages: ConcurrentLinkedQueue<ByteArray> = ConcurrentLinkedQueue()
+
+    override fun currentState(): ConsumerState = ConsumerState(consumedMessages)
+
+    override fun reset(): IO<Unit> = IO {
+        consumedMessages.clear()
+    }
+
+    fun update(record: ReceiverRecord<ByteArray, ByteArray>) = IO<Unit> {
+        logger.trace { "Updating stats for message from ${record.topic()}:${record.partition()}" }
+        consumedMessages.add(record.value())
+    }
+
+    companion object {
+        private val logger = Logger(Consumer::class)
+    }
+}
+
+class ConsumerFactory(private val kafkaBootstrapServers: String) {
+    fun createConsumerForTopics(kafkaTopics: Set<String>): IO<Consumer> =
+            KafkaSource.create(kafkaBootstrapServers, kafkaTopics.toSet()).start()
+}