Examples with SPLStream com.ibm.streamsx.topology.spl.SPLStream used on opensource projects

Example 36 with SPLStream

use of com.ibm.streamsx.topology.spl.SPLStream in project streamsx.health by IBMStreams.

the class JsonSubscriber method subscribe.

public static TStream<String> subscribe(Topology topo, String topic) {
    SPLStream splStream = SPLStreams.subscribe(topo, topic, JSONSchemas.JSON);
    TStream<String> stringStream = splStream.transform(new SplToTStream());
    return stringStream;
}

Example 37 with SPLStream

use of com.ibm.streamsx.topology.spl.SPLStream in project streamsx.topology by IBMStreams.

the class HTTPStreams method getJSON.

/**
     * Periodically poll a web service using HTTP {@code GET} for
     * {@code application/json} data. Declares a source stream that will contain
     * a single tuple for each successful {@code GET}. The tuple is the complete
     * JSON ({@code application/json} content) returned by the request.
     * 
     * @param te
     *            Topology the source stream will be contained in.
     * @param url
     *            URL to poll.
     * @param period
     *            Poling period.
     * @param unit
     *            Unit for {@code period}.
     * @return Stream that will contain the JSON tuples from periodic HTTP
     *         {@code GET} requests.
     */
public static TStream<JSONObject> getJSON(TopologyElement te, String url, long period, TimeUnit unit) {
    Map<String, Object> params = new HashMap<>();
    params.put("url", url);
    double dperiod = (unit.toMillis(period) / 1000.0);
    params.put("period", dperiod);
    SPLStream rawJson = SPL.invokeSource(te, "com.ibm.streamsx.inet.http::HTTPGetJSONContent", params, JSONSchemas.JSON);
    TStream<String> string = SPLStreams.toStringStream(rawJson);
    return JSONStreams.deserialize(string);
}

Example 38 with SPLStream

use of com.ibm.streamsx.topology.spl.SPLStream in project streamsx.health by IBMStreams.

the class JsonPublisher method publish.

public static void publish(TStream<String> jsonInputStream, String topic) {
    SPLStream splStream = SPLStreams.convertStream(jsonInputStream, new JsonToSpl(), JSONSchemas.JSON);
    splStream.publish(topic);
}

Example 39 with SPLStream

use of com.ibm.streamsx.topology.spl.SPLStream in project streamsx.topology by IBMStreams.

the class KafkaConsumer method subscribe.

/**
     * Subscribe to a topic and create a stream of messages.
     * <p>
     * N.B., A topology that includes this will not support
     * {@code StreamsContext.Type.EMBEDDED}.
     * <p>
     * N.B. due to com.ibm.streamsx.messaging 
     * <a href="https://github.com/IBMStreams/streamsx.messaging/issues/118">issue#118</a>,
     * multiple consumers will have issues in
     * {@code StreamsContext.Type.STANDALONE}.
     * <p>
     * N.B. due to com.ibm.streamsx.messaging 
     * <a href="https://github.com/IBMStreams/streamsx.messaging/issues/117">issue#117</a>,
     * a consumer in {@code StreamsContext.Type.STANDALONE} subsequently results
     * in an orphaned @{code standalone} processes that continues as the lead
     * group/topic consumer thereby preventing subsequent instances of the
     * group/topic consumer from receiving messages. 
     * <p>
     * N.B. due to com.ibm.streamsx.messaging 
     * <a href="https://github.com/IBMStreams/streamsx.messaging/issues/114">issue#114</a>,
     * a consumer essentially ignores messages generated by producers where the
     * optional {@code key} is {@code null}.
     * e.g., Kafka's {@code kafka-console-producer.sh} tool generates
     * {@code key==null} messages.
     *
     * @param threadsPerTopic number of threads to allocate to processing each
     *        topic.  May be a submission parameter.
     * @param topic the topic to subscribe to.  May be a submission parameter.
     * @return TStream&lt;Message>
     *      The generated {@code Message} tuples have a non-null {@code topic}.
     *      The tuple's {@code key} will be null if the Kafka message
     *      lacked a key or it's key was the empty string. 
     * @throws IllegalArgumentException if topic is null.
     * @throws IllegalArgumentException if threadsPerTopic is null.
     * @see Value
     * @see Topology#createSubmissionParameter(String, Class)
     */
public TStream<Message> subscribe(Supplier<Integer> threadsPerTopic, Supplier<String> topic) {
    if (topic == null)
        throw new IllegalArgumentException("topic");
    if (threadsPerTopic == null || (threadsPerTopic.get() != null && threadsPerTopic.get() <= 0))
        throw new IllegalArgumentException("threadsPerTopic");
    Map<String, Object> params = new HashMap<>();
    params.put("topic", topic);
    if (threadsPerTopic instanceof Value && threadsPerTopic.get() == 1)
        // The default is one.
        ;
    else
        params.put("threadsPerTopic", threadsPerTopic);
    if (!config.isEmpty())
        params.put("kafkaProperty", Util.toKafkaProperty(config));
    // workaround streamsx.messaging issue #107
    params.put("propertiesFile", PROP_FILE_PARAM);
    addPropertiesFile();
    // Use SPL.invoke to avoid adding a compile time dependency
    // to com.ibm.streamsx.messaging since JavaPrimitive.invoke*()
    // lack "kind" based variants.
    String kind = "com.ibm.streamsx.messaging.kafka::KafkaConsumer";
    String className = "com.ibm.streamsx.messaging.kafka.KafkaSource";
    SPLStream rawKafka = SPL.invokeSource(te, kind, params, KafkaSchemas.KAFKA);
    SPL.tagOpAsJavaPrimitive(toOp(rawKafka), kind, className);
    TStream<Message> rcvdMsgs = toMessageStream(rawKafka);
    rcvdMsgs.colocate(rawKafka);
    // workaround streamsx.messaging issue#118 w/java8
    // isolate even in the single consumer case since we don't
    // know if others may be subsequently created.
    rcvdMsgs = rcvdMsgs.isolate();
    return rcvdMsgs;
}

Example 40 with SPLStream

use of com.ibm.streamsx.topology.spl.SPLStream in project streamsx.topology by IBMStreams.

the class MqttStreams method publish.

/**
     * Publish {@code stream} tuples to one or more MQTT topics.
     * <p>
     * If {@code topic} is null, each tuple is published to the topic
     * specified by its {@link Message#getTopic()}.
     * Otherwise, all tuples are published to {@code topic}.
     * <p>
     * The messages added to MQTT include a topic and message.
     * The {@link Message#getKey()} field is ignored.
     * <p>
     * The message is handled with the quality of service
     * indicated by configuration property {@code defaultQOS}.
     * 
     * @param stream the stream to publish
     * @param topic topic to publish to.  May be a submission parameter. May be null.
     * @return the sink element
     * @see Value
     * @see Topology#createSubmissionParameter(String, Class)
     */
public TSink publish(TStream<? extends Message> stream, Supplier<String> topic) {
    stream = stream.lowLatency();
    @SuppressWarnings("unchecked") SPLStream splStream = SPLStreams.convertStream((TStream<Message>) stream, cvtMsgFunc(topic), MqttSchemas.MQTT);
    Map<String, Object> params = new HashMap<String, Object>();
    params.put("reconnectionBound", -1);
    params.put("qos", 0);
    params.putAll(Util.configToSplParams(config));
    params.remove("messageQueueSize");
    if (topic == null)
        params.put("topicAttributeName", "topic");
    else
        params.put("topic", topic);
    params.put("dataAttributeName", "message");
    if (++opCnt > 1) {
        // each op requires its own clientID
        String clientId = (String) params.get("clientID");
        if (clientId != null && clientId.length() > 0)
            params.put("clientID", opCnt + "-" + clientId);
    }
    // Use SPL.invoke to avoid adding a compile time dependency
    // to com.ibm.streamsx.messaging since JavaPrimitive.invoke*()
    // lack "kind" based variants.
    String kind = "com.ibm.streamsx.messaging.mqtt::MQTTSink";
    String className = "com.ibm.streamsx.messaging.kafka.MqttSinkOperator";
    TSink sink = SPL.invokeSink(kind, splStream, params);
    SPL.tagOpAsJavaPrimitive(sink.operator(), kind, className);
    return sink;
}