Message Reactions API for PubNub Java SDK

Breaking changes in v9.0.0

PubNub Java SDK version 9.0.0 unifies the codebases for Java and Kotlin SDKs, introduces a new way of instantiating the PubNub client, and changes asynchronous API callbacks and emitted status events. These changes can impact applications built with previous versions (< 9.0.0) of the Java SDK.

For more details about what has changed, refer to Java/Kotlin SDK migration guide.

Add or remove actions on published messages to build features like receipts, reactions, or to associate custom metadata to messages. Clients can subscribe to a channel to receive message action events on that channel. They can also fetch past message actions from Message Persistence independently or when they fetch original messages.

Add Message Reaction

Requires Message Persistence

This method requires that Message Persistence is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

Add an action on a published message. Returns the added action in the response.

Method(s)

To add a Message Reaction you can use the following method(s) in the Java SDK:

this.pubnub.addMessageAction()
    .channel(String)
    .messageAction(PNMessageAction);

Parameter	Type	Required	Description
channel	String	Yes	Specifies channel name to publish message actions to.
messageAction	PNMessageAction	Yes	The message action object containing the message action's type, value and the publish timetoken of the original message.
async	Consumer<Result>	Yes	Consumer of a Result of type PNAddMessageActionResult.

Basic Usage

pubnub.addMessageAction()
        .channel("my_channel")
        .messageAction(new PNMessageAction()
                .setType("reaction")
                .setValue("smiley_face")
                .setMessageTimetoken(15701761818730000L)
        )
        .async(result -> {
            result.onSuccess(res -> {
                System.out.println(res.getType());
                System.out.println(res.getValue());
                System.out.println(res.getUuid());
                System.out.println(res.getActionTimetoken());
                System.out.println(res.getMessageTimetoken());
            }).onFailure(exception -> {

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Returns

The addMessageAction() operation returns a PNAddMessageActionResult which contains the following operations:

Method	Type	Description
getType()	String	Message action's type.
getValue()	String	Message action's value.
getUuid()	String	Publisher of the message action.
getActionTimetoken()	Long	Timestamp when the message action was created.
getMessageTimetoken()	Long	Timestamp when the actual message was created the message action belongs to.

PNMessageAction

Method	Type	Description
setType()	String	Message action's type.
setValue()	String	Message action's value.
setMessageTimetoken()	Long	Timestamp of the actual message was created the message action belongs to.

Remove Message Reaction

Requires Message Persistence

This method requires that Message Persistence is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

Remove a previously added action on a published message. Returns an empty response.

Method(s)

To Remove a Message Reaction you can use the following method(s) in the Java SDK:

this.pubnub.removeMessageAction()
    .channel(String)
    .messageTimetoken(Long)
    .actionTimetoken(Long);

Parameter	Type	Required	Description
channel	String	Yes	Specifies channel name to publish message actions to.
messageTimetoken	Long	Yes	Publish timetoken of the original message
actionTimetoken	Long	Yes	Publish timetoken of the message action to be removed.
async	Consumer<Result>	Yes	Consumer of a Result of type PNRemoveMessageActionResult.

Basic Usage

pubnub.removeMessageAction()
        .channel("my_channel")
        .messageTimetoken(15701761818730000L)
        .actionTimetoken(15701775691010000L)
        .async(result -> { /* check result */ });

Returns

The removeMessageAction() operation returns a no actionable data.

Get Message Reactions

Requires Message Persistence

This method requires that Message Persistence is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

Get a list of message actions in a channel. Returns a list of actions sorted by the action's timetoken in ascending order.

Truncated response

Number of message actions in the response may be truncated when internal limits are hit. If the response is truncated, a more property will be returned with additional parameters. Send iterative calls to Message Persistence adjusting the parameters to fetch more message actions.

Method(s)

To Get Message Reactions you can use the following method(s) in the Java SDK:

this.pubnub.getMessageActions()
    .channel(String)
    .start(Long)
    .end(Long)
    .limit(Integer);

Parameter	Type	Required	Default	Description
channel	String	Yes		The channel name.
start	Long	Optional		Message Reaction timetoken denoting the start of the range requested (return values will be less than start).
end	Long	Optional		Message Reaction timetoken denoting the end of the range requested (return values will be greater than or equal to end).
limit	Integer	Optional	100	Specifies the number of actions to return in response. Default/Maximum is 100.
async	Consumer<Result>	Yes		Consumer of a Result of type PNGetMessageActionsResult.

Basic Usage

pubnub.getMessageActions()
        .channel("my_channel")
        .async(result -> {
            result.onSuccess(res -> {
                List<PNMessageAction> actions = res.getActions();
                for (PNMessageAction action : actions) {
                    System.out.println(action.getType());
                    System.out.println(action.getValue());
                    System.out.println(action.getUuid());
                    System.out.println(action.getActionTimetoken());
                    System.out.println(action.getMessageTimetoken());
                }
            }).onFailure(exception -> {
                exception.printStackTrace();
            });

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Returns

The getMessageActions() operation returns a list of PNGetMessageActionsResult objects, each containing the following operations:

Method	Type	Description
getType()	String	Message action's type.
getValue()	String	Message action's value.
getUuid()	String	Publisher of the message action.
getActionTimetoken()	Long	Timestamp when the message action was created.
getMessageTimetoken()	Long	Timestamp when the actual message was created the message action belongs to.

Other Examples

Fetch Messages with paging

public static void main(String args[]){
    getMessageActionsWithPaging("my_channel", System.currentTimeMillis() * 10_000L, new Callback() {
            @Override
            public void onMore(List<PNMessageAction> actions) {
                System.out.println("Next set of actions: " + actions.size());
            }

            @Override
            public void onDone() {
                System.out.println("All actions fetched");
            }
        });
}

/**

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