@FunctionalInterface public interface RawBackgroundFunction
Here is an example of an implementation that parses the JSON payload using Gson, to access its
messageId
property:
public class Example implements RawBackgroundFunction {
private static final Logger logger = Logger.getLogger(Example.class.getName());
@Override
public void accept(String json, Context context) {
JsonObject jsonObject = new Gson().fromJson(json, JsonObject.class);
JsonElement messageId = jsonObject.get("messageId");
String messageIdString = messageId.getAsJsonString();
logger.info("Got messageId " + messageIdString);
}
}
Here is an example of an implementation that deserializes the JSON payload into a Java object for simpler access, again using Gson:
public class Example implements RawBackgroundFunction { private static final Logger logger = Logger.getLogger(Example.class.getName());@Override
public void accept(String json, Context context) { PubSubMessage message = new Gson().fromJson(json, PubSubMessage.class); logger.info("Got messageId " + message.messageId); } } // Where PubSubMessage is a user-defined class like this: public class PubSubMessage { String data;Map<String, String>
attributes; String messageId; String publishTime; }
Modifier and Type | Method and Description |
---|---|
void |
accept(String json,
Context context)
Called to service an incoming event.
|
void accept(String json, Context context) throws Exception
Error
) then the HTTP response will have a 500 status code.json
- the payload of the event, as a JSON string.context
- the context of the event. This is a set of values that every event has,
separately from the payload, such as timestamp and event type.Exception
Copyright © 2020. All rights reserved.