Example usage for org.apache.solr.client.solrj.io.stream.expr StreamFactory getFunctionName

Introduction

In this page you can find the example usage for org.apache.solr.client.solrj.io.stream.expr StreamFactory getFunctionName.

Prototype

public String getFunctionName(Class<? extends Expressible> clazz) throws IOException 

Source Link

Usage

From source file:com.dennisgove.streaming.expressions.kafka.KafkaTopicConsumerStream.java

License:Apache License

/**
 * Accepts a valid {@link StreamExpression} adhering to the form above and constructs
 * a new instance of the KafkaTopicConsumerStream.
 *
 * @param expression A valid kafkaConsume {@link StreamExpression}
 * @param factory A valid {@link StreamFactory}
 * @throws IOException If unable to parse or deal with the incoming expression
 *//*  ww  w .  j ava 2  s  . c  o  m*/
public KafkaTopicConsumerStream(StreamExpression expression, StreamFactory factory) throws IOException {
    String bootstrapServers = getStringParameter("bootstrapServers", expression, factory);
    String groupId = getStringParameter("groupId", expression, factory);
    String topic = getStringParameter("topic", expression, factory);
    //    List<String> partitions = getMultiStringParameter("partitions", expression, factory);

    Map<String, String> otherParams = new HashMap<>();
    for (StreamExpressionNamedParameter param : factory.getNamedOperands(expression).stream()
            .filter(item -> !knownParameters.contains(item.getName())).collect(Collectors.toList())) {
        if (param.getParameter() instanceof StreamExpressionValue) {
            otherParams.put(param.getName(), ((StreamExpressionValue) param.getParameter()).getValue());
        }
    }

    if (null == bootstrapServers) {
        throw new IOException(String.format(Locale.ROOT,
                "Invalid %s expressions '%s' - expecting a list of bootstrapServers but found none",
                factory.getFunctionName(getClass()), expression));
    }

    if (null == topic) {
        throw new IOException(String.format(Locale.ROOT,
                "Invalid %s expressions '%s' - expecting a single topic but found none",
                factory.getFunctionName(getClass()), expression));
    }

    this.bootstrapServers = bootstrapServers;
    this.otherConsumerParams = otherParams;
    this.groupId = groupId;
    this.topic = topic;
    //    this.partitions = partitions;
}

---

From source file:com.dennisgove.streaming.expressions.kafka.KafkaTopicConsumerStream.java

License:Apache License

/**
 * Returns a valid expression for this instance.
 *//*from  w  w  w.  ja va 2s  .c o  m*/
@Override
public StreamExpressionParameter toExpression(StreamFactory factory) throws IOException {
    StreamExpression expression = new StreamExpression(factory.getFunctionName(getClass()));

    expression.addParameter(new StreamExpressionNamedParameter("bootstrapServers", bootstrapServers));
    expression.addParameter(new StreamExpressionNamedParameter("topic", topic));
    if (null != groupId) {
        expression.addParameter(new StreamExpressionNamedParameter("groupId", groupId));
    }

    return expression;
}

---

From source file:com.dennisgove.streaming.expressions.kafka.KafkaTopicConsumerStream.java

License:Apache License

/**
 * Returns a valid explanation of this stream instance
 *//*from  w w  w  .j a  v a2 s  .  co  m*/
@Override
public Explanation toExplanation(StreamFactory factory) throws IOException {

    StreamExplanation explanation = new StreamExplanation(getStreamNodeId().toString());
    explanation.setFunctionName(String.format(Locale.ROOT, factory.getFunctionName(getClass())));
    explanation.setImplementingClass(getClass().getName());
    explanation.setExpressionType(ExpressionType.STREAM_SOURCE);

    // child is a kafka topic so add it at this point
    StreamExplanation child = new StreamExplanation(getStreamNodeId() + "-kafka-topic");
    child.setFunctionName(String.format(Locale.ROOT, "kafka (%s)", topic));
    child.setImplementingClass("Kafka");
    child.setExpressionType(ExpressionType.DATASTORE);
    child.setExpression("Consuming from " + bootstrapServers);

    explanation.addChild(child);

    return explanation;
}

---