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README.md

Twitter Source

A Hazelcast Jet connector for Twitter Streaming API which enables Hazelcast Jet pipelines to consume tweets from multiple Twitter APIs:

  • Twitter’s Streaming API – Push from Twitter, real-time stream, it samples tweets (1-40% of Tweets can be consumed this way)

  • Twitter’s Search API – result limited to 15 tweets per request, and 180 requests every 15 minutes.

Connector Attributes

Source Attributes

Attribute Value
Has Source Yes
Batch Yes
Stream Yes
Distributed No

Sink Attributes

Attribute Value
Has Sink No
Distributed No

Getting Started

Installing

The Hazelcast Twitter Source Connector artifacts are published on the Maven repositories.

Add the following lines to your pom.xml to include it as a dependency to your project:

<dependency>
    <groupId>com.hazelcast.jet.contrib</groupId>
    <artifactId>twitter</artifactId>
    <version>${version}</version>
</dependency>

If you are using Gradle:

compile group: 'com.hazelcast.jet.contrib', name: 'twitter', version: ${version}

Running the tests

To run the tests run the command below:

./gradlew test

Usage

Reading from Twitter's Streaming API

To use Twitter Streaming Endpoints as a source in your pipeline you need to create a source by calling the TwitterSources.stream() or TwitterSources.timestampedStream() methods with a Properties object that includes Twitter credentials, and a supplier function(SupplierEx) that provides a specific Twitter streaming endpoint.

The Twitter Stream Source provides tweets as JSON formatted raw strings. You can extract related fields from tweets by parsing them into a JSON objects.

Here's an example job which the Jet pipelines ingest tweets from Twitter's Filtered Stream Endpoint that filters the tweets by keywords.

Properties credentials = new Properties();
properties.setProperty("consumerKey", "???"); // OAuth1 Consumer Key
properties.setProperty("consumerSecret", "???"); // OAuth1 Consumer Secret
properties.setProperty("token", "???"); // OAuth1 Token
properties.setProperty("tokenSecret", "???"); // OAuth1 Token Secret
List<String> terms = new ArrayList<>(Arrays.asList("BTC", "ETH"));
StreamSource<String> streamSource =
             TwitterSources.stream(
                     credentials,
                     () -> new StatusesFilterEndpoint().trackTerms(terms)
             );
Pipeline p = Pipeline.create();
p.readFrom(streamSource)
 .withoutTimestamps()
 .writeTo(Sinks.logger());
JetInstance jet = createJetMember();
Job job = jet.newJob(p);
job.join();

For the demo application using Twitter Stream Source see: Cryptocurrency Sentiment Analysis

Getting tweets From Twitter's Search API

To use Twitter Search Endpoint as a source in your pipeline you need to create a source by calling the TwitterSources.search() method with a Properties object that includes Twitter credentials, and a String that includes search query. Twitter search source (TwitterSources.search()) executes the query and emits the results as they arrive.

Because Twitter uses the pagination technique at this endpoint, Twitter Search Connector performs multiple requests for the same query to get all available pages. Twitter has a rate limit for the search endpoint that limits the number of these search requests to 180 calls every 15 minutes. Twitter Connector repeatedly makes search requests until it gets all available pages or the rate-limit is exceeded.

The Search Source provides tweets as Status object that enables the user extract related fields of it by using its getter methods.

Here is an example job which ingests tweets that are related to the Jet flies search query.

Properties credentials = new Properties();
properties.setProperty("consumerKey", "???"); // OAuth1 Consumer Key
properties.setProperty("consumerSecret", "???"); // OAuth1 Consumer Secret
properties.setProperty("token", "???"); // OAuth1 Token
properties.setProperty("tokenSecret", "???"); // OAuth1 Token Secret
String query = "Jet flies";
BatchSource<Status> searchSource = TwitterSources.search(credentials, query);
Pipeline p = Pipeline.create();
p.readFrom(searchSource)
 .map(status -> "@" + status.getUser().getName() + " - " + status.getText())
 .writeTo(Sinks.logger);
JetInstance jet = createJetMember();
Job job = jet.newJob(p);
job.join(); 

For more detail check out: TwitterSources, TwitterSourceTest.

Authors

  • Ufuk Yilmaz

See also the list of contributors who participated in this project.

License

This project is licensed under the Apache 2.0 license - see the LICENSE file for details

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