Subscribe #

Subscribes by providing a set of filters: messages, document changes and, optionally, user events matching the provided filters will generate real-time notifications, sent to you in real-time by Kuzzle.

:::: tabs ::: tab Java

Arguments #

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public CompletableFuture<String> subscribe(
  String index, 
  String collection, 
  Map<String, Object> filters,
  String scope,
  String users,
  boolean subscribeToSelf,
  Map<String, Object> volatiles,
  NotificationHandler handler, 
) throws NotConnectedException, InternalException

public CompletableFuture<String> subscribe(
  String index, 
  String collection, 
  Map<String, Object> filters,
  String scope,
  String users,
  boolean subscribeToSelf,
  NotificationHandler handler, 
) throws NotConnectedException, InternalException

public CompletableFuture<String> subscribe(
  String index, 
  String collection, 
  Map<String, Object> filters,
  String scope,
  String users,
  NotificationHandler handler, 
) throws NotConnectedException, InternalException

public CompletableFuture<String> subscribe(
  String index, 
  String collection, 
  Map<String, Object> filters,
  String scope,
  NotificationHandler handler, 
) throws NotConnectedException, InternalException

public CompletableFuture<String> subscribe(
  String index, 
  String collection, 
  Map<String, Object> filters,
  NotificationHandler handler, 
) throws NotConnectedException, InternalException

Argument	Type	Description
`index`	String	Index name
`collection`	String	Collection name
`filters`	Map<String, Object>	Map representing a set of filters following Koncorde syntax
`handler`	NotificationHandler	Handler function to handle notifications
`scope`	String (`all`)	Subscribes to document entering or leaving the scope Possible values: all, in, out, none
`users`	String (`none`)	Subscribes to users entering or leaving the room Possible values: all, in, out, none
`subscribeToSelf`	boolean (`true`)	Subscribes to notifications fired by our own queries
`volatile`	Map<String, Object> (`{}`)	Map representing subscription information, used in user join/leave notifications

handler #

Handler function that will be called each time a new notification is received. The handler will receive a Response as its only argument.

Return #

The room ID.

Usage #

Simple subscription to document notifications_

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Map<String, Object> filters = new HashMap<>();
filters.put("exists", "name");
Map<String, Object> document = new HashMap<>();
document.put("name", "nina-vkote");
final String roomId = kuzzle.getRealtimeController().subscribe(
  "nyc-open-data",
  "yellow-taxi",
  filters,
  notification -> {
    if (notification.getScope().equals("in")) {
      System.out.println("Document entered the scope");
    } else {
      System.out.println("Document left the scope");
    }
}).get();
Map<String, Object> query = new HashMap<>();
query.put("controller", "document");
query.put("action", "create");
query.put("index", "nyc-open-data");
query.put("collection", "yellow-taxi");
query.put("_id", "nina-vkote");
query.put("body", document);
kuzzle.query(query).get();

Subscription to document notifications with scope option_

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Map<String, Object> filters = new HashMap<>();
Map<String, Object> range = new HashMap<>();
Map<String, Object> age = new HashMap<>();
age.put("lte", 20);
range.put("age", age);
filters.put("range", range);
kuzzle.getRealtimeController().subscribe(
  "nyc-open-data",
  "yellow-taxi",
  filters,
  "all",
  "all",
  notification -> {
    if (notification.getScope().equals("out")) {
      System.out.println("Document left the scope");
    } else {
      System.out.println("Document moved in the scope");
    }
  }).get();
Map document = new HashMap<>();
document.put("age", 19);
Map<String, Object> query = new HashMap<>();
query.put("controller", "document");
query.put("action", "create");
query.put("index", "nyc-open-data");
query.put("collection", "yellow-taxi");
query.put("_id", "nina-vkote");
query.put("body", document);
kuzzle.query(query).get();
query.put("action", "update");
document.put("age", 42);
kuzzle.query(query).get();

::: ::: tab Kotlin