GraphSearchStreaming | API Reference | ArcGIS Maps SDK for JavaScript 4.30

The search operation is performed on a knowledge graph service's graph resource. This operation allows you to search the properties of both entities and relationships in the graph. Any field with the text data type or the Globally Unique Identifier (GUID) data type with the searchable properties set to true is included in the search. A search index is built and maintained automatically on the values for all searchable fields.

Streaming search returns the result faster than search and in small chunks that can be rendered immediately. Streaming search also provides additional parameters to constrain the search.

See also

Examples

// example GraphSearchStreaming used in a executeSearchStreaming
KnowledgeGraphModule.executeSearchStreaming(
  knowledgeGraph,
  { // autocasts to new GraphSearchStreaming
    searchQuery: "solar",
    typeCategoryFilter: "both",
    returnSearchContext: false,
    start: 1, // index of first record to return
    num: 200, // return 200 records.
    namedTypesFilter: ["Company", "Supplier", "Part"],
    idsFilter: ["{G4E8G2S8D-2GS5-98S4-3S5D-S1DE7G45DS48}",
                     "{FNWI1G5W-1A5W-3A5W-8412-A1W5F4W8F7AS}",
                     "{9D2D6AFD-41F1-49A4-8412-CACCC9906E88}"]
  }
).then((streamingSearchResult)=>{
  // the result of a streaming search is a readableStream which requires decoding.
  readStream(streamingSearchResult)
})

// a function to read the readable stream returned from the above query
const readStream = async (streamingQueryResult) => {
  let time = Date.now();
  let reader = streamingQueryResult.resultRowsStream.getReader();
  try {
    while (true) {
      const { done, value } = await reader.read();
      if (done) {
        console.log(`Completed database requests: ${(Date.now() - time) / 1000} seconds`, value);
        break;
      }
      console.log(`Chunk returned in: ${(Date.now() - time) / 1000} seconds`, value)
    }
  } catch (err) {
    if (err.name === "AbortError") {
      console.log("Request aborted as expected");
    } else {
      throw err;
    }
  }
};

// sample result of read streaming search result chunk printed to the console
"Streaming chunk returned in: 0.082 seconds"
[
  [{
    "declaredClass": "esri.rest.knowledgeGraph.Entity",
    "properties": {
      "Name": "Suncommon",
      "Employee_Count": 400,
      "energyType": "solar"
    },
    "typeName": "Company",
    "id": "{G4E8G2S8D-2GS5-98S4-3S5D-S1DE7G45DS48}"
  }],
  [{
    "declaredClass": "esri.rest.knowledgeGraph.Entity",
    "properties": {
      "Name": "Quality Solar Supply",
      "Supplier_code": "158B",
      "City": "New Orleans",
    },
    "typeName": "Supplier",
    "id": "{FNWI1G5W-1A5W-3A5W-8412-A1W5F4W8F7AS}"
  }],
  [{
    "declaredClass": "esri.rest.knowledgeGraph.Entity",
    "properties": {
      "Name": "Solar panel",
      "panel_type": "Polycrystalline",
      "price_per_unit": 400
    },
    "typeName": "Part",
    "id": "{9D2D6AFD-41F1-49A4-8412-CACCC9906E88}"
  }]
]

Constructors

GraphSearchStreaming Constructor new GraphSearchStreaming(properties)

Parameter

properties Object

optional

See the properties for a list of all the properties

Property Overview

Any properties can be set, retrieved or listened to. See the Working with Properties topic.

Show inherited properties

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Type	Summary	Class
String	The name of the class.	Accessor
String []	Specifies list of IDs to search.	GraphSearchStreaming
String []	Specifies list of names of entity types or relationship types to search.	GraphSearchStreaming
Number	The maximum number of results returned from the search.	GraphSearchStreaming
Boolean	If `true`, returns the IDs of objects that match the search, the names of the properties that matched the search term, scores and highlights of the result set.	GraphSearchStreaming
String	The text to search for in the knowledge graph.	GraphSearch
Number	The index of the first result to return.	GraphSearchStreaming
String	Specifies whether to search entities, relationships, or both.	GraphSearch

Property Details

declaredClass Inherited Property declaredClass Stringreadonly Inherited from Accessor

The name of the class. The declared class name is formatted as esri.folder.className.

idsFilter Property idsFilter String[]

Specifies list of IDs to search.

namedTypesFilter Property namedTypesFilter String[]

Specifies list of names of entity types or relationship types to search.

num Property num Number

The maximum number of results returned from the search.

returnSearchContext Property returnSearchContext Boolean

If true, returns the IDs of objects that match the search, the names of the properties that matched the search term, scores and highlights of the result set.

Default Value:false

searchQuery Inherited Property searchQuery String Inherited from GraphSearch

The text to search for in the knowledge graph. Accepts Lucene search syntax.

Required

knowledgeGraphService.executeSearch() will fail if not provided.

start Property start Number

The index of the first result to return.

typeCategoryFilter Inherited Property typeCategoryFilter String Inherited from GraphSearch

Specifies whether to search entities, relationships, or both. Valid values are entity, relationship, or both.

Note

Check the service definition for the knowledgeGraphService (see ArcGIS REST APIs - Hosted Knowledge Graph Service) for valid values of typeCategoryFilter. Not all services support both.

Required

This property is required for the search to execute successfully. If the service does not support both one of the other options must be specified.

Possible Values:"entity" |"relationship" |"both"

Default Value:"both"

Method Overview

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Return Type	Summary	Class
	Adds one or more handles which are to be tied to the lifecycle of the object.	Accessor
Boolean	Returns true if a named group of handles exist.	Accessor
	Removes a group of handles owned by the object.	Accessor

Method Details

addHandles Inherited Method addHandles(handleOrHandles, groupKey) Inherited from Accessor

Adds one or more handles which are to be tied to the lifecycle of the object. The handles will be removed when the object is destroyed.

// Manually manage handles
const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true }
);

this.addHandles(handle);

// Destroy the object
this.destroy();

Parameters

handleOrHandles WatchHandle|WatchHandle []

Handles marked for removal once the object is destroyed.

groupKey *

optional

Key identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group.

hasHandles Inherited Method hasHandles(groupKey){Boolean} Inherited from Accessor

Returns true if a named group of handles exist.

Parameter

groupKey *

optional

A group key.

Returns

Type	Description
Boolean	Returns `true` if a named group of handles exist.

Example

// Remove a named group of handles if they exist.
if (obj.hasHandles("watch-view-updates")) {
  obj.removeHandles("watch-view-updates");
}

removeHandles Inherited Method removeHandles(groupKey) Inherited from Accessor

Removes a group of handles owned by the object.

Parameter

groupKey *

optional

A group key or an array or collection of group keys to remove.

Example

obj.removeHandles(); // removes handles from default group

obj.removeHandles("handle-group");
obj.removeHandles("other-handle-group");