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Java SDK Getting Started

The CloudQuant Data Liberator Java SDK uses Apache Arrow for efficient data streaming and provides a generator-based iteration pattern.

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Prerequisites

sudo apt-get install ca-certificates-java openjdk-17-jdk openjdk-17-jre maven
Run the ./build_maven.sh script to build the Maven project and install the project dependencies.

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Required Security Files

Place the following files from your Downloads ZIP in your working directory:
  • liberator.pfx — Security certificate
  • liberator.json — Contains your Username and Token
liberator.pfx and liberator.json must be in your working directory.

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Quick Start

Liberator liberator = new Liberator();
Object query_id = liberator.query(new HashMap<>() {{
    put("name", "daily_bars");
    put("as_of", "2020-11-15");
    put("symbols", "AAPL");
}});

for (Liberator.QueryResult res : liberator.Generate()) {
    Object res_id = res.GetId();
    Object data = res.GetData();
    if (data instanceof org.apache.arrow.vector.VectorSchemaRoot) {
        org.apache.arrow.vector.VectorSchemaRoot recordBatch =
            (org.apache.arrow.vector.VectorSchemaRoot) data;
        printRecordBatch(recordBatch);
    } else if (data instanceof javax.json.JsonValue) {
        javax.json.JsonValue jsonValue = (javax.json.JsonValue) data;
        System.out.println(jsonValue);
    }
}