1 files changed, 59 insertions, 0 deletions
diff --git a/components/datalake-handler/feeder/src/main/java/org/onap/datalake/feeder/service/TopicNameService.java b/components/datalake-handler/feeder/src/main/java/org/onap/datalake/feeder/service/TopicNameService.java
new file mode 100644
index 00000000..021d2c94
--- /dev/null
+++ b/components/datalake-handler/feeder/src/main/java/org/onap/datalake/feeder/service/TopicNameService.java
@@ -0,0 +1,59 @@
+/*
+* ============LICENSE_START=======================================================
+* ONAP : DATALAKE
+* ================================================================================
+* Copyright 2019 China Mobile
+*=================================================================================
+* 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.datalake.feeder.service;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import org.apache.commons.collections.CollectionUtils;
+import org.onap.datalake.feeder.domain.TopicName;
+import org.onap.datalake.feeder.repository.TopicNameRepository;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+/**
+ * Service for TopicName
+ * 
+ * @author Guobiao Mo
+ *
+ */
+@Service
+public class TopicNameService {
+	private final Logger log = LoggerFactory.getLogger(this.getClass());
+
+	@Autowired
+	private TopicNameRepository topicNameRepository;
+
+	public void update(Collection<String> allTopicNames) {
+
+		List<TopicName> all = allTopicNames.stream().map(s-> new TopicName(s)).collect(Collectors.toList());
+		List<TopicName> allInDb = (List<TopicName>) topicNameRepository.findAll();
+		
+		Collection<TopicName> additions =  CollectionUtils.subtract(all, allInDb);
+
+		if(!additions.isEmpty())
+			topicNameRepository.saveAll(additions);
+		 
+	}
+}