[
https://issues.apache.org/jira/browse/GORA-650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17344737#comment-17344737
]
ASF GitHub Bot commented on GORA-650:
-------------------------------------
kamaci commented on a change in pull request #218:
URL: https://github.com/apache/gora/pull/218#discussion_r632677158
##########
File path:
gora-arangodb/src/main/java/org/apache/gora/arangodb/store/ArangoDBStore.java
##########
@@ -0,0 +1,690 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+
+package org.apache.gora.arangodb.store;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.Base64;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Properties;
+import java.util.List;
+import java.util.ArrayList;
+
+import com.arangodb.ArangoDB;
+import com.arangodb.entity.BaseDocument;
+import org.apache.avro.Schema;
+import org.apache.avro.util.Utf8;
+import org.apache.gora.arangodb.query.ArangoDBQuery;
+import org.apache.gora.persistency.impl.BeanFactoryImpl;
+import org.apache.gora.persistency.impl.DirtyListWrapper;
+import org.apache.gora.persistency.impl.DirtyMapWrapper;
+import org.apache.gora.persistency.impl.PersistentBase;
+import org.apache.gora.query.PartitionQuery;
+import org.apache.gora.query.Query;
+import org.apache.gora.query.Result;
+import org.apache.gora.query.impl.PartitionQueryImpl;
+import org.apache.gora.store.impl.DataStoreBase;
+import org.apache.gora.util.AvroUtils;
+import org.apache.gora.util.ClassLoadingUtils;
+import org.apache.gora.util.GoraException;
+
+
+/**
+ * {@inheritDoc}
+ * {@link org.apache.gora.arangodb.store.ArangoDBStore} is the primary class
+ * responsible for facilitating GORA CRUD operations on ArangoDB documents.
+ */
+public class ArangoDBStore<K, T extends PersistentBase> extends
DataStoreBase<K, T> {
+
+ public static final String DEFAULT_MAPPING_FILE =
"/gora-arangodb-mapping.xml";
+ private ArangoDBStoreParameters arangoDbStoreParams;
+ private ArangoDBMapping arangoDBMapping;
+ private ArangoDB arangoDB;
+
+ /**
+ * {@inheritDoc}
+ * Initialize the ArangoDB dataStore by {@link Properties} parameters.
+ *
+ * @param keyClass key class type for dataStore.
+ * @param persistentClass persistent class type for dataStore.
+ * @param properties ArangoDB dataStore properties EG:- ArangoDB client
credentials.
+ */
+ @Override
+ public void initialize(Class<K> keyClass, Class<T> persistentClass,
Properties properties) throws GoraException {
+ super.initialize(keyClass, persistentClass, properties);
+ try {
+ arangoDbStoreParams = ArangoDBStoreParameters.load(properties);
+ arangoDB = new ArangoDB.Builder()
+ .host(arangoDbStoreParams.getServerHost(),
+ Integer.valueOf(arangoDbStoreParams.getServerPort()))
+ .user(arangoDbStoreParams.getUserName())
+ .password(arangoDbStoreParams.getUserPassword())
+
.maxConnections(Integer.valueOf(arangoDbStoreParams.getConnectionPoolSize()))
+ .build();
+ if (!arangoDB.db(arangoDbStoreParams.getDatabaseName()).exists())
+ arangoDB.createDatabase(arangoDbStoreParams.getDatabaseName());
+
+ ArangoDBMappingBuilder<K, T> builder = new
ArangoDBMappingBuilder<>(this);
+ arangoDBMapping =
builder.fromFile(arangoDbStoreParams.getMappingFile()).build();
+ if (!schemaExists()) {
+ createSchema();
+ }
+ } catch (Exception e) {
+ LOG.error("Error while initializing ArangoDB dataStore: {}",
+ new Object[]{e.getMessage()});
+ throw new RuntimeException(e);
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public String getSchemaName(final String mappingSchemaName,
+ final Class<?> persistentClass) {
+ return super.getSchemaName(mappingSchemaName, persistentClass);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public String getSchemaName() {
+ return arangoDBMapping.getDocumentClass();
+ }
+
+ /**
+ * {@inheritDoc}
+ * Create a new class of ArangoDB documents if necessary. Enforce specified
schema over the document class.
+ */
+ @Override
+ public void createSchema() throws GoraException {
+ if (schemaExists()) {
+ return;
+ }
+ try {
+ arangoDB.db(arangoDbStoreParams.getDatabaseName())
+ .createCollection(arangoDBMapping.getDocumentClass());
+
+ } catch (Exception e) {
+ throw new GoraException(e);
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ * Deletes enforced schema over ArangoDB Document class.
+ */
+ @Override
+ public void deleteSchema() throws GoraException {
+ try {
+ arangoDB.db(arangoDbStoreParams.getDatabaseName())
+ .collection(arangoDBMapping.getDocumentClass()).drop();
+ } catch (Exception e) {
+ throw new GoraException(e);
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ * Check whether there exist a schema enforced over ArangoDB document class.
+ */
+ @Override
+ public boolean schemaExists() throws GoraException {
+ try {
+ return arangoDB
+ .db(arangoDbStoreParams.getDatabaseName())
+ .collection(arangoDBMapping.getDocumentClass()).exists();
+ } catch (Exception e) {
+ throw new GoraException(e);
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public T get(K key, String[] fields) throws GoraException {
+ try {
+ boolean isExists = arangoDB.db(arangoDbStoreParams.getDatabaseName())
+
.collection(arangoDBMapping.getDocumentClass()).documentExists(key.toString());
+ if (isExists) {
+ String[] dbFields = getFieldsToQuery(fields);
+ BaseDocument document =
arangoDB.db(arangoDbStoreParams.getDatabaseName())
+
.collection(arangoDBMapping.getDocumentClass()).getDocument(key.toString(),
BaseDocument.class);
+ return convertArangoDBDocToAvroBean(document, dbFields);
+ } else {
+ return null;
+ }
+ } catch (Exception e) {
+ throw new GoraException(e);
+ }
+ }
+
+ public T convertArangoDBDocToAvroBean(final BaseDocument obj, final String[]
fields) throws GoraException {
+ T persistent = newPersistent();
+ String[] dbFields = getFieldsToQuery(fields);
+ for (String f : dbFields) {
+ String docf = arangoDBMapping.getDocumentField(f);
+ if (docf == null || !obj.getProperties().containsKey(docf))
+ continue;
+
+ ArangoDBMapping.DocumentFieldType storeType =
arangoDBMapping.getDocumentFieldType(docf);
+ Schema.Field field = fieldMap.get(f);
+ Schema fieldSchema = field.schema();
+
+ LOG.debug("Load from ODocument, field:{}, schemaType:{}, docField:{},
storeType:{}",
+ new Object[]{field.name(), fieldSchema.getType(), docf,
storeType});
+ Object result = convertDocFieldToAvroField(fieldSchema, storeType,
field, docf, obj);
+ persistent.put(field.pos(), result);
+ }
+ persistent.clearDirty();
+ return persistent;
+ }
+
+ private Object convertDocFieldToAvroField(final Schema fieldSchema,
+ final
ArangoDBMapping.DocumentFieldType storeType,
+ final Schema.Field field,
+ final String docf,
+ final BaseDocument obj) throws
GoraException {
+ Object result = null;
+ switch (fieldSchema.getType()) {
+ case MAP:
+ result = convertDocFieldToAvroMap(docf, fieldSchema, obj, field,
storeType);
+ break;
+ case ARRAY:
+ result = convertDocFieldToAvroList(docf, fieldSchema, obj, field,
storeType);
+ break;
+ case RECORD:
+ BaseDocument record = (BaseDocument) obj.getAttribute(docf);
+ if (record == null) {
+ result = null;
+ break;
+ }
+ result = convertAvroBeanToArangoDBDoc(fieldSchema, record);
+ break;
+ case BOOLEAN:
+ result = Boolean.valueOf(obj.getAttribute(docf).toString());
+ break;
+ case DOUBLE:
+ result = Double.valueOf(obj.getAttribute(docf).toString());
+ break;
+ case FLOAT:
+ result = Float.valueOf(obj.getAttribute(docf).toString());
+ break;
+ case INT:
+ result = Integer.valueOf(obj.getAttribute(docf).toString());
+ break;
+ case LONG:
+ result = Long.valueOf(obj.getAttribute(docf).toString());
+ break;
+ case STRING:
+ result = new Utf8(obj.getAttribute(docf).toString());
+ ;
+ break;
+ case ENUM:
+ result = AvroUtils.getEnumValue(fieldSchema,
obj.getAttribute(docf).toString());
+ break;
+ case BYTES:
+ case FIXED:
+ if (!obj.getProperties().containsKey(docf)) {
+ result = null;
+ break;
+ }
+ result = ByteBuffer.wrap(Base64
+ .getDecoder()
+ .decode(obj.getAttribute(docf).toString()));
+ break;
+ case NULL:
+ result = null;
+ break;
+ case UNION:
+ result = convertDocFieldToAvroUnion(fieldSchema, storeType, field,
docf, obj);
+ break;
+ default:
+ LOG.warn("Unable to read {}", docf);
+ break;
+ }
+ return result;
+ }
+
+ private Object convertDocFieldToAvroUnion(final Schema fieldSchema,
+ final
ArangoDBMapping.DocumentFieldType storeType,
+ final Schema.Field field,
+ final String docf,
+ final BaseDocument doc) throws
GoraException {
+ Object result;
+ Schema.Type type0 = fieldSchema.getTypes().get(0).getType();
+ Schema.Type type1 = fieldSchema.getTypes().get(1).getType();
+
+ if (!type0.equals(type1)
+ && (type0.equals(Schema.Type.NULL) ||
type1.equals(Schema.Type.NULL))) {
+ Schema innerSchema = null;
+ if (type0.equals(Schema.Type.NULL)) {
+ innerSchema = fieldSchema.getTypes().get(1);
+ } else {
+ innerSchema = fieldSchema.getTypes().get(0);
+ }
+
+ LOG.debug("Load from ODocument (UNION), schemaType:{}, docField:{},
storeType:{}",
+ new Object[]{innerSchema.getType(), docf, storeType});
+
+ result = convertDocFieldToAvroField(innerSchema, storeType, field, docf,
doc);
+ } else {
+ throw new GoraException("ArangoDBStore only supports Union of two types
field.");
+ }
+ return result;
+ }
+
+ private Object convertAvroBeanToArangoDBDoc(final Schema fieldSchema,
+ final BaseDocument doc) throws
GoraException {
+ Object result;
+ Class<?> clazz = null;
+ try {
+ clazz = ClassLoadingUtils.loadClass(fieldSchema.getFullName());
+ } catch (Exception e) {
+ throw new GoraException(e);
+ }
+ PersistentBase record = (PersistentBase) new BeanFactoryImpl(keyClass,
clazz).newPersistent();
+ for (Schema.Field recField : fieldSchema.getFields()) {
+ Schema innerSchema = recField.schema();
+ ArangoDBMapping.DocumentFieldType innerStoreType = arangoDBMapping
+ .getDocumentFieldType(recField.name());
+ String innerDocField = arangoDBMapping.getDocumentField(recField.name())
!= null ? arangoDBMapping
+ .getDocumentField(recField.name()) : recField.name();
+ LOG.debug("Load from ODocument (RECORD), field:{}, schemaType:{},
docField:{}, storeType:{}",
+ new Object[]{recField.name(), innerSchema.getType(),
innerDocField,
+ innerStoreType});
+ record.put(recField.pos(),
+ convertDocFieldToAvroField(innerSchema, innerStoreType,
recField, innerDocField,
+ doc));
+ }
+ result = record;
+ return result;
+ }
+
+ private Object convertDocFieldToAvroList(final String docf,
+ final Schema fieldSchema,
+ final BaseDocument doc,
+ final Schema.Field f,
+ final
ArangoDBMapping.DocumentFieldType storeType) throws GoraException {
+
+ if (storeType == ArangoDBMapping.DocumentFieldType.LIST) {
+ List<Object> list = (List<Object>) doc.getAttribute(docf);
+ List<Object> rlist = new ArrayList<>();
+ if (list == null) {
+ return new DirtyListWrapper(rlist);
+ }
+
+ for (Object item : list) {
+ BaseDocument innerDoc = new BaseDocument();
+ innerDoc.addAttribute("item", item);
+ Object o = convertDocFieldToAvroField(fieldSchema.getElementType(),
storeType, f,
+ "item", innerDoc);
+ rlist.add(o);
+ }
+ return new DirtyListWrapper<>(rlist);
+ }
+ return null;
+ }
+
+ private Object convertDocFieldToAvroMap(final String docf, final Schema
fieldSchema,
+ final BaseDocument doc, final
Schema.Field f,
+ final
ArangoDBMapping.DocumentFieldType storeType) throws GoraException {
+ if (storeType == ArangoDBMapping.DocumentFieldType.MAP) {
+ Map<String, Object> map = (Map<String, Object>) doc.getAttribute(docf);
+ Map<Utf8, Object> rmap = new HashMap<>();
+ if (map == null) {
+ return new DirtyMapWrapper(rmap);
+ }
+
+ for (Map.Entry entry : map.entrySet()) {
+ String mapKey = entry.getKey().toString();
+ Object o = convertDocFieldToAvroField(fieldSchema.getValueType(),
storeType, f, mapKey,
+ decorateOTrackedMapToODoc(map));
+ rmap.put(new Utf8(mapKey), o);
+ }
+ return new DirtyMapWrapper<>(rmap);
+ } else {
+ BaseDocument innerDoc = (BaseDocument) doc.getAttribute(docf);
+ Map<Utf8, Object> rmap = new HashMap<>();
+ if (innerDoc == null) {
+ return new DirtyMapWrapper(rmap);
+ }
+
+ for (String fieldName : innerDoc.getProperties().keySet()) {
+ String mapKey = fieldName;
+ Object o = convertDocFieldToAvroField(fieldSchema.getValueType(),
storeType, f, mapKey,
+ innerDoc);
+ rmap.put(new Utf8(mapKey), o);
+ }
+ return new DirtyMapWrapper<>(rmap);
+ }
+ }
+
+ private BaseDocument decorateOTrackedMapToODoc(Map<String, Object> map) {
+ BaseDocument doc = new BaseDocument();
+ for (Map.Entry entry : map.entrySet()) {
+ doc.addAttribute(entry.getKey().toString(), entry.getValue());
+ }
+ return doc;
+ }
+
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public void put(K key, T val) throws GoraException {
+ if (val.isDirty()) {
+ try {
+ boolean isExists = arangoDB.db(arangoDbStoreParams.getDatabaseName())
+
.collection(arangoDBMapping.getDocumentClass()).documentExists(key.toString());
+ if (!isExists) {
+ BaseDocument document = convertAvroBeanToArangoDocument(key, val);
+ arangoDB.db(arangoDbStoreParams.getDatabaseName())
+ .collection(arangoDBMapping.getDocumentClass())
+ .insertDocument(document);
+ } else {
+ BaseDocument document = convertAvroBeanToArangoDocument(key, val);
+ arangoDB.db(arangoDbStoreParams.getDatabaseName())
+ .collection(arangoDBMapping.getDocumentClass())
+ .updateDocument(key.toString(), document);
+ }
+ } catch (Exception e) {
+ throw new GoraException(e);
+ }
+ } else {
+ if (LOG.isDebugEnabled()) {
+ LOG.info("Ignored putting persistent bean {} in the store as it is
neither "
+ + "new, neither dirty.", new Object[]{val});
+ }
+ }
+ }
+
+ private BaseDocument convertAvroBeanToArangoDocument(final K key, final T
persistent) {
+ BaseDocument result = new BaseDocument();
+ for (Schema.Field f : persistent.getSchema().getFields()) {
+ if (persistent.isDirty(f.pos()) && (persistent.get(f.pos()) != null)) {
+ String docf = arangoDBMapping.getDocumentField(f.name());
+ Object value = persistent.get(f.pos());
+ ArangoDBMapping.DocumentFieldType storeType =
arangoDBMapping.getDocumentFieldType(docf);
+ LOG.debug("Transform value to ODocument, docField:{}, schemaType:{},
storeType:{}",
+ new Object[]{docf, f.schema().getType(), storeType});
+ Object o = convertAvroFieldToArangoField(docf, f.schema(),
f.schema().getType(),
+ storeType, value);
+ result.addAttribute(docf, o);
+ }
+ }
+ result.setKey(key.toString());
+ return result;
+ }
+
+ private Object convertAvroFieldToArangoField(final String docf, final Schema
fieldSchema,
+ final Schema.Type fieldType,
+ final
ArangoDBMapping.DocumentFieldType storeType,
+ final Object value) {
+ Object result = null;
+ switch (fieldType) {
+ case MAP:
+ if (storeType != null && !(storeType ==
ArangoDBMapping.DocumentFieldType.MAP ||
+ storeType == ArangoDBMapping.DocumentFieldType.DOCUMENT)) {
+ throw new IllegalStateException(
+ "Field " + fieldSchema.getName()
+ + ": to store a AVRO 'map', target ArangoDB mapping
have to be of type 'Map'" +
+ "| 'Document'");
+ }
+ Schema valueSchema = fieldSchema.getValueType();
+ result = convertAvroMapToDocField(docf, (Map<CharSequence, ?>) value,
valueSchema,
+ valueSchema.getType(), storeType);
+ break;
+ case ARRAY:
+ if (storeType != null && !(storeType ==
ArangoDBMapping.DocumentFieldType.LIST)) {
+ throw new IllegalStateException("Field " + fieldSchema.getName()
+ + ": To store a AVRO 'array', target ArangoDB mapping have
to be of type 'List'");
+ }
+ Schema elementSchema = fieldSchema.getElementType();
+ result = convertAvroListToDocField(docf, (List<?>) value,
elementSchema,
+ elementSchema.getType(), storeType);
+ break;
+ case BYTES:
+ case FIXED:
+ if (value != null) {
+ result = Base64.getEncoder()
+ .encodeToString(((ByteBuffer) value).array());
+ }
+ break;
+ case INT:
+ case LONG:
+ case FLOAT:
+ case DOUBLE:
+ case BOOLEAN:
+ result = value;
+ break;
+ case STRING:
+ if (value != null) {
+ result = value.toString();
+ }
+ break;
+ case ENUM:
+ if (value != null)
+ result = value.toString();
+ break;
+ case RECORD:
+ if (value == null)
+ break;
+ result = convertAvroBeanToArangoDBDocField(docf, fieldSchema, value);
+ break;
+ case UNION:
+ result = convertAvroUnionToArangoDBField(docf, fieldSchema, storeType,
value);
+ break;
+ default:
+ LOG.error("Unknown field type: {}", fieldSchema.getType());
+ break;
+ }
+ return result;
+ }
+
+ private Object convertAvroMapToDocField(final String docf,
+ final Map<CharSequence, ?> value,
final Schema fieldSchema,
+ final Schema.Type fieldType,
+ final
ArangoDBMapping.DocumentFieldType storeType) {
+ if (storeType == ArangoDBMapping.DocumentFieldType.MAP) {
+ HashMap map = new HashMap<String, Object>();
+ if (value == null)
+ return map;
+
+ for (Map.Entry<CharSequence, ?> e : value.entrySet()) {
+ String mapKey = e.getKey().toString();
+ Object mapValue = e.getValue();
+
+ ArangoDBMapping.DocumentFieldType fieldStoreType =
arangoDBMapping.getDocumentFieldType(docf);
+ Object result = convertAvroFieldToArangoField(docf, fieldSchema,
fieldType, fieldStoreType,
+ mapValue);
+ map.put(mapKey, result);
+ }
+ return map;
+ } else {
+ BaseDocument doc = new BaseDocument();
+ if (value == null)
+ return doc;
+ for (Map.Entry<CharSequence, ?> e : value.entrySet()) {
+ String mapKey = e.getKey().toString();
+ Object mapValue = e.getValue();
+
+ ArangoDBMapping.DocumentFieldType fieldStoreType =
arangoDBMapping.getDocumentFieldType(docf);
+ Object result = convertAvroFieldToArangoField(docf, fieldSchema,
fieldType, fieldStoreType,
+ mapValue);
+ doc.addAttribute(mapKey, result);
+ }
+ return doc;
+ }
+ }
+
+ private Object convertAvroListToDocField(final String docf, final
Collection<?> array,
+ final Schema fieldSchema, final
Schema.Type fieldType,
+ final
ArangoDBMapping.DocumentFieldType storeType) {
+ if (storeType == ArangoDBMapping.DocumentFieldType.LIST) {
+ ArrayList list;
+ list = new ArrayList<Object>();
+ if (array == null)
+ return list;
+ for (Object item : array) {
+ ArangoDBMapping.DocumentFieldType fieldStoreType =
arangoDBMapping.getDocumentFieldType(docf);
+ Object result = convertAvroFieldToArangoField(docf, fieldSchema,
fieldType, fieldStoreType, item);
+ list.add(result);
+ }
+ return list;
+ }
+ return null;
+ }
+
+ private BaseDocument convertAvroBeanToArangoDBDocField(final String docf,
+ final Schema
fieldSchema,
+ final Object value) {
+ BaseDocument record = new BaseDocument();
+ for (Schema.Field member : fieldSchema.getFields()) {
+ Object innerValue = ((PersistentBase) value).get(member.pos());
+ String innerDoc = arangoDBMapping.getDocumentField(member.name());
+ Schema.Type innerType = member.schema().getType();
+ ArangoDBMapping.DocumentFieldType innerStoreType =
arangoDBMapping.getDocumentFieldType(innerDoc);
+ LOG.debug("Transform value to BaseDocument , docField:{}, schemaType:{},
storeType:{}",
+ new Object[]{member.name(), member.schema().getType(),
+ innerStoreType});
+ Object fieldValue = convertAvroFieldToArangoField(docf, member.schema()
+ , innerType, innerStoreType, innerValue);
+ record.addAttribute(member.name(), fieldValue);
+ }
+ return record;
+ }
+
+ private Object convertAvroUnionToArangoDBField(final String docf, final
Schema fieldSchema,
+ final
ArangoDBMapping.DocumentFieldType storeType,
+ final Object value) {
+ Object result;
+ Schema.Type type0 = fieldSchema.getTypes().get(0).getType();
+ Schema.Type type1 = fieldSchema.getTypes().get(1).getType();
+
+ if (!type0.equals(type1)
+ && (type0.equals(Schema.Type.NULL) ||
type1.equals(Schema.Type.NULL))) {
+ Schema innerSchema = null;
+ if (type0.equals(Schema.Type.NULL)) {
+ innerSchema = fieldSchema.getTypes().get(1);
+ } else {
+ innerSchema = fieldSchema.getTypes().get(0);
+ }
+
+ LOG.debug("Transform value to ODocument (UNION), type:{}, storeType:{}",
+ new Object[]{innerSchema.getType(), type1, storeType});
+
+ result = convertAvroFieldToArangoField(docf, innerSchema,
innerSchema.getType(), storeType, value);
+ } else {
+ throw new IllegalStateException("ArangoDBStore only supports Union of
two types field.");
+ }
+ return result;
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public boolean delete(K key) throws GoraException {
+ try {
+ arangoDB.db(arangoDbStoreParams.getDatabaseName())
+ .collection(arangoDBMapping.getDocumentClass())
+ .deleteDocument(key.toString());
+ return true;
+ } catch (Exception e) {
+ throw new GoraException(e);
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public long deleteByQuery(Query<K, T> query) throws GoraException {
+ return 0L;
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Result<K, T> execute(Query<K, T> query) throws GoraException {
+ try {
+ return null;
+ } catch (Exception e) {
+ throw new GoraException(e);
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Query<K, T> newQuery() {
+ return new ArangoDBQuery<>(this);
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public List<PartitionQuery<K, T>> getPartitions(Query<K, T> query) throws
IOException {
+ List<PartitionQuery<K, T>> partitions = new ArrayList<>();
+ PartitionQueryImpl<K, T> partitionQuery = new PartitionQueryImpl<>(
+ query);
+ partitionQuery.setConf(this.getConf());
+ partitions.add(partitionQuery);
+ return partitions;
+ }
+
+ /**
+ * {@inheritDoc}
+ * Flushes locally cached to content in memory to remote ArangoDB server.
+ */
+ @Override
+ public void flush() throws GoraException {
+
+ }
+
+ /**
+ * {@inheritDoc}
+ * Releases resources which have been used dataStore.
+ */
+ @Override
+ public void close() {
+ try {
+ flush();
+ } catch (Exception ex) {
+ LOG.error("Error occurred while flushing data to ArangoDB : ", ex);
+ }
+ }
+
+ @Override
+ public boolean exists(K key) throws GoraException {
+ boolean isExists = arangoDB.db(arangoDbStoreParams.getDatabaseName())
+
.collection(arangoDBMapping.getDocumentClass()).documentExists(key.toString());
+ return isExists;
Review comment:
Inline variable.
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> Add datastore for ArangoDB
> --------------------------
>
> Key: GORA-650
> URL: https://issues.apache.org/jira/browse/GORA-650
> Project: Apache Gora
> Issue Type: New Feature
> Affects Versions: 0.9
> Reporter: Kevin Ratnasekera
> Priority: Major
> Labels: gsoc2020
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> May be we should consider extending our multimodal datastore support with
> ArangoDB. [1]
> [1] https://www.arangodb.com/why-arangodb/multi-model/
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