By specifying the typeName as ‘map<string,string>’, we can set an attribute to take map of values.
"attributeDefs": [
{
"name": "myMap",
"typeName": "map<string,string>",
"isOptional": false,
"cardinality": "SINGLE",
"valuesMinCount": 1,
"valuesMaxCount": 1,
"isUnique": false,
"isIndexable": false,
"includeInNotification": false,
"searchWeight": -1
}
]
Find the below working application.
Create atlas-application.properties file under src/main/resources folder.
atlas-application.properties
atlas.client.readTimeoutMSecs=30000 atlas.client.connectTimeoutMSecs=30000
Define AttributeTypeMap class.
AttributeTypeMap.java
package com.sample.app.attributes;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.apache.atlas.AtlasClientV2;
import org.apache.atlas.AtlasServiceException;
import org.apache.atlas.model.instance.AtlasEntity;
import org.apache.atlas.model.typedef.AtlasEntityDef;
import org.apache.atlas.model.typedef.AtlasTypesDef;
import org.apache.atlas.model.typedef.AtlasStructDef.AtlasAttributeDef;
import com.fasterxml.jackson.core.JsonProcessingException;
public class AttributeTypeMap {
private static final String TYPE_NAME = "DemoType4";
private static void createType(AtlasClientV2 atlasClient) throws AtlasServiceException {
AtlasAttributeDef attributeDef1 = new AtlasAttributeDef();
attributeDef1.setName("myMap");
attributeDef1.setTypeName("map<string,string>");
attributeDef1.setIsIndexable(false);
attributeDef1.setIsUnique(false);
AtlasEntityDef atlasEntityDef = new AtlasEntityDef();
atlasEntityDef.setName(TYPE_NAME);
atlasEntityDef.setCreatedBy("Krishna");
atlasEntityDef.setUpdatedBy("krishna");
atlasEntityDef.setDescription("Represent a demo specification");
atlasEntityDef.setAttributeDefs(Arrays.asList(attributeDef1));
Set<String> superTypes = new HashSet<>();
superTypes.add("DataSet");
atlasEntityDef.setSuperTypes(superTypes);
AtlasTypesDef atlasTypesDef = new AtlasTypesDef();
atlasTypesDef.getEntityDefs().add(atlasEntityDef);
atlasClient.createAtlasTypeDefs(atlasTypesDef);
}
private static void createEntity(AtlasClientV2 atlasClient) throws AtlasServiceException {
AtlasEntity atlasEntity = new AtlasEntity();
atlasEntity.setTypeName(TYPE_NAME);
Map<String, Object> map = new HashMap<>();
map.put("name", "Krishna");
map.put("age", "23");
Map<String, String> address = new HashMap<>();
address.put("city", "Bangalore");
address.put("state", "Karnatka");
map.put("address", address);
atlasEntity.setAttribute("myMap", map);
// Following are the mandatory attributes
atlasEntity.setAttribute("qualifiedName", "AttributeTypeMap_DEMO1");
atlasEntity.setAttribute("name", "AttributeTypeMap_DEMO1");
AtlasEntity.AtlasEntityWithExtInfo atlasEntityWithExtInfo = new AtlasEntity.AtlasEntityWithExtInfo();
atlasEntityWithExtInfo.setEntity(atlasEntity);
atlasClient.createEntity(atlasEntityWithExtInfo);
}
public static void main(String[] args) throws AtlasServiceException, JsonProcessingException {
AtlasClientV2 atlasClient = new AtlasClientV2(new String[] { "http://localhost:21000" },
new String[] { "admin", "admin" });
createType(atlasClient);
createEntity(atlasClient);
}
}
Run above application.
Open Atlas UI and query for the type ‘DemoType4’.
Click on the link ‘AttributeTypeMap_DEMO1’ to view the entity attributes.
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