Diffusion – Event Driven API for Web & Mobile Apps

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session.topics.add('my-topic',diffusion.topics.TopicType.JSON);
var value = { foo : 'bar' };
var result = session.topicUpdate.set('my-topic', diffusion.datatypes.json(), value);

await session.TopicControl.AddTopicAsync( “my-topic”, TopicType.JSON );
var jsonDataType = Diffusion.DataTypes.JSON;
var value = jsonDataType.FromJSONString("{"foo": "bar"}");
var result = session.TopicUpdate.SetAsync(
    "my-topic",
    value);

session.feature(TopicControl.class).addTopic(
  "my-topic",
  TopicType.JSON,
  new TopicControl.AddCallback.Default()); final JSONDataType jsonDataType = Diffusion.dataTypes()
  .json();

  final JSON value = jsonDataType.fromJsonString(
  "{"foo" : "bar"}"); final CompletableFuture result = session.feature(TopicUpdate.class).set(
    "my-topic", JSON.class, value);

self.session!.topicControl.add(
withTopicPath: "my-topic",
        type: PTDiffusionTopicType.JSON,
        value: nil,
        completionHandler: self.errorHandler)
Now that the topic exists, you can publish data to it. Add the following lines:

var error: NSError? = nil
let value = PTDiffusionJSON(object: ["foo" : "bar" ], error: &error)

self.session!.topicUpdateControl.updater.update(
        withTopicPath: "my-topic",
        value: value,
        completionHandler: self.errorHandler)

session.feature(TopicControl.class).addTopic("my-topic", TopicType.JSON);

    final JSONDataType jsonDataType = Diffusion.dataTypes().json(); final JSON value = jsonDataType
    .fromJsonString("{"foo" : "bar"}"); final CompletableFuture result = session.feature(
      opicUpdate.class).set("my-topic", JSON.class, value)

char *topic_path = “my-topic”;

BUF_T *buf = buf_create();
write_diffusion_json_value("{"foo" : "bar"}", buf);

DIFFUSION_TOPIC_UPDATE_SET_PARAMS_T topic_update_params = {
    .topic_path = topic_path,
    .datatype = DATATYPE_JSON,
    .update = buf
};

diffusion_topic_update_set(session, topic_update_params);

requests.post('https://api.diffusion.cloud/topics/add', headers={ 'Authorization':
'Bearer ' + token }, json = { 'path': 'sensors/1032952' })

requests.post('https://api.diffusion.cloud/topics/set', headers={ 'Authorization':
'Bearer ' + token }, json = {
 'value': { 'latitude': 44.934, 'longitude': -93.262, "timestamp": 15903912 },
 'path': 'sensors/1032952'
})

$client = new \GuzzleHttp\Client(["base_uri" => "https://api.diffusion.cloud"]);
$client->post("/topics/add", [
 'headers' => ['Authorization' => 'Bearer '],
 'json' => [ 'path' => 'sensors/1032952']
]);

$client = new \GuzzleHttp\Client(["base_uri" => "https://api.diffusion.cloud"]);
$client->post("/topics/set", [
 'headers' => ['Authorization' => 'Bearer '],
 'json' => [
 'value' => ['latitude' => 44.934, 'longitude' => -93.262, "timestamp" => 15903912
]
 'path' => 'sensors/1032952'
 ]
]);

req, _ := http.NewRequest("POST", "https://api.diffusion.cloud/topics/add",
strings.NewReader("{\”path\": \"sensors/1032952\"}"))
req.Header.Add("Authorization", "Bearer ")
req.Header.Add("content-type", "application/json")
client := &http.Client {}
res, err := client.Do(req)

value = strings.NewReader("{\”path\": \"sensors/1032952\", \"value\": {\"latitude\":
44.934, \"longitude\": -93.262, \"timestamp\": 15903912 } }")
req, _ := http.NewRequest("POST", "https://api.diffusion.cloud/topics/set", value)
req.Header.Add("Authorization", "Bearer ")
req.Header.Add("content-type", "application/json")
client := &http.Client {}
res, err := client.Do(req)

curl --include
   --request POST
   --url https://api.diffusion.cloud/topics/add
   --header 'authorization: Bearer '
   --header 'content-type: application/json'
   -d '{"path": "sensors/1032952" }'

curl --include
  --request POST
  --url https://api.diffusion.cloud/topics/set
  --header 'authorization: Bearer '
  --header 'content-type: application/json'
  -d '{"path": "sensors/1032952", "value": { "latitude": 44.934, "longitude": -
93.262, "timestamp": 15903912 }'

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session.addStream('my-topic', diffusion.datatypes.json()).on('value', function(topic, specification, newValue, oldValue) {
  console.log(`New value for ${path}: ${newValue.get()}`);
  session.select('my-topic');
});

class ExampleValueStream : IValueStream
 {
     public void OnSubscription(string topicPath, ITopicSpecification specification)
     {
         Console.WriteLine($"Subscribed to: {topicPath}");
     }

     public void OnUnsubscription(string topicPath, ITopicSpecification specification, TopicUnsubscribeReason reason)
     {
         Console.WriteLine($"Unsubscribed from: {topicPath}");
     }

     public void OnValue(string topicPath, ITopicSpecification specification, IJSON oldValue, IJSON newValue)
     {
         Console.WriteLine($"{topicPath}: {newValue.ToJSONString()}");
     }

     public void OnClose()
     {
         // Not used
     }

     public void OnError(ErrorReason errorReason)
     {
         // Not used
     }
}

session.Topics.AddStream("my-topic", new ExampleValueStream());

await session.GetTopicsFeature().SubscribeAsync("my-topic");

session.feature(Topics.class).addStream("my-counter", JSON.class, new Topics.ValueStream.Default <
    JSON > () {
      @Override
      public void onValue(String topicPath, TopicSpecification topicSpec, JSON oldValue,
        JSON newValue) {
        System.out.println("New value for" + topicPath + ": " + newValue.toJsonString());
      }
    });
    session.feature(Topics.class).subscribe("my-counter");

class StreamDelegate: NSObject, PTDiffusionJSONValueStreamDelegate {
        func diffusionStream(
    _ stream: PTDiffusionStream,
    didSubscribeToTopicPath topicPath: String,
    specification: PTDiffusionTopicSpecification) {
              print("Subscribed to: \(topicPath)")
        }

        func diffusionStream(
            _ stream: PTDiffusionValueStream,
           didUpdateTopicPath topicPath: String,
           specification: PTDiffusionTopicSpecification,
           oldJSON: PTDiffusionJSON?,
           newJSON: PTDiffusionJSON) {

           do {
              let value:Dictionary = try newJSON.object() as! Dictionary
              print("\(topicPath): \(value.description)")
           } catch {
              print("Unable to read message")
           }
    }
}

session.feature(Topics.class).addStream("my-counter", JSON.class, new Topics.ValueStream.Default <
    JSON > () {
      @Override
      public void onValue(String topicPath, TopicSpecification topicSpec, JSON oldValue,
        JSON newValue) {
        System.out.println("New value for" + topicPath + ": " + newValue.toJsonString());
      }
    });

   session.feature(Topics.class).subscribe("my-counter");

static int on_value(const char *const topic_path,
    const TOPIC_SPECIFICATION_T *const specification,
    DIFFUSION_DATATYPE datatype,
    const DIFFUSION_VALUE_T *const old_value,
    const DIFFUSION_VALUE_T *const new_value,
    void *context)
{
    char *result;
    to_diffusion_json_string(new_value, &result, NULL);
    printf(“New value for %s: %s \n”, topic_path, result);
    free(result);

    return HANDLER_SUCCESS;
}

char *topic_selector = “>my-topic”;

VALUE_STREAM_T value_stream = {
    .datatype = DATATYPE_JSON,
    .on_value = on_value
};

add_stream(session, topic_selector, &value_stream);

SUBSCRIPTION_PARAMS_T params = {
    .topic_selector = topic_selector
};

subscribe(session, params);

var response = requests.post('https://api.diffusion.cloud/topics/fetch', headers={
'Authorization': 'Bearer ' + token }, json = { selector: '?sensors/.*' })
print (response.json()[‘results])

$client = new \GuzzleHttp\Client(["base_uri" => "https://api.diffusion.cloud"]);
$response = $client->post("/topics/fetch", [
 'headers' => ['Authorization' => 'Bearer '],
 'json' => [ 'selector' => '?sensors/.*']
]);
echo json_decode($response->getBody())[‘results’];

req, _ := http.NewRequest("POST", "https://api.diffusion.cloud/topics/fetch",
strings.NewReader("{\selector\": \"?sensors/.*\"}"))
req.Header.Add("Authorization", "Bearer ")
req.Header.Add("content-type", "application/json")
client := &http.Client {}
res, err := client.Do(req)

curl --include
  --request POST
  --url https://api.diffusion.cloud/topics/fetch
  --header 'authorization: Bearer '
  --header 'content-type: application/json'
  -d '{"selector": "?sensors/.*" }'

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