Examples with QueryRequest org.opennms.netmgt.measurements.model.QueryRequest used on opensource projects

Example 21 with QueryRequest

use of org.opennms.netmgt.measurements.model.QueryRequest in project opennms by OpenNMS.

the class JEXLExpressionEngineTest method performExpression.

private double[] performExpression(String expression, Map<String, Object> constants) throws ExpressionException {
    // Build a simple request with the given expression
    QueryRequest request = new QueryRequest();
    Source constant = new Source();
    constant.setLabel("x");
    request.setSources(Lists.newArrayList(constant));
    Expression exp = new Expression();
    exp.setLabel("y");
    exp.setExpression(expression);
    request.setExpressions(Lists.newArrayList(exp));
    // Build the fetch results with known values
    final int N = 100;
    long[] timestamps = new long[N];
    double[] xValues = new double[N];
    for (int i = 0; i < N; i++) {
        timestamps[i] = i * 1000;
        xValues[i] = Double.valueOf(i);
    }
    Map<String, double[]> values = Maps.newHashMap();
    values.put("x", xValues);
    FetchResults results = new FetchResults(timestamps, values, 1, constants);
    // Use the engine to evaluate the expression
    jexlExpressionEngine.applyExpressions(request, results);
    // Retrieve the results
    return results.getColumns().get("y");
}