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/*
* ============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.ArrayList;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import org.json.JSONObject;
import org.onap.datalake.feeder.config.ApplicationConfiguration;
import org.onap.datalake.feeder.domain.Topic;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.couchbase.client.java.Bucket;
import com.couchbase.client.java.Cluster;
import com.couchbase.client.java.CouchbaseCluster;
import com.couchbase.client.java.document.JsonDocument;
import com.couchbase.client.java.document.JsonLongDocument;
import com.couchbase.client.java.document.json.JsonObject;
import rx.Observable;
import rx.functions.Func1;
/**
* Service to use Couchbase
*
* @author Guobiao Mo
*
*/
@Service
public class CouchbaseService {
private final Logger log = LoggerFactory.getLogger(this.getClass());
@Autowired
private ApplicationConfiguration config;
Bucket bucket;
@PostConstruct
private void init() {
// Initialize Couchbase Connection
Cluster cluster = CouchbaseCluster.create(config.getCouchbaseHost());
cluster.authenticate(config.getCouchbaseUser(), config.getCouchbasePass());
bucket = cluster.openBucket(config.getCouchbaseBucket());
log.info("Connect to Couchbase " + config.getCouchbaseHost());
// Create a N1QL Primary Index (but ignore if it exists)
bucket.bucketManager().createN1qlPrimaryIndex(true, false);
}
@PreDestroy
public void cleanUp() {
bucket.close();
}
public void saveJsons(Topic topic, List<JSONObject> jsons) {
List<JsonDocument> documents= new ArrayList<>(jsons.size());
for(JSONObject json : jsons) {
//convert to Couchbase JsonObject from org.json JSONObject
JsonObject jsonObject = JsonObject.fromJson(json.toString());
long timestamp = jsonObject.getLong("_ts");//this is Kafka time stamp, which is added in StoreService.messageToJson()
//setup TTL
int expiry = (int) (timestamp/1000L) + topic.getTtl()*3600*24; //in second
String id = getId(topic.getId());
JsonDocument doc = JsonDocument.create(id, expiry, jsonObject);
documents.add(doc);
}
saveDocuments(documents);
}
private String getId(String topicStr) {
//String id = topicStr+":"+timestamp+":"+UUID.randomUUID();
//https://forums.couchbase.com/t/how-to-set-an-auto-increment-id/4892/2
//atomically get the next sequence number:
// increment by 1, initialize at 0 if counter doc not found
//TODO how slow is this compared with above UUID approach?
JsonLongDocument nextIdNumber = bucket.counter(topicStr, 1, 0); //like 12345
String id = topicStr +":"+ nextIdNumber.content();
return id;
}
//https://docs.couchbase.com/java-sdk/2.7/document-operations.html
private void saveDocuments(List<JsonDocument> documents) {
Observable
.from(documents)
.flatMap(new Func1<JsonDocument, Observable<JsonDocument>>() {
@Override
public Observable<JsonDocument> call(final JsonDocument docToInsert) {
return bucket.async().insert(docToInsert);
}
})
.last()
.toBlocking()
.single();
}
}
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