Robert Metzger created FLINK-2017:
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Summary: Add predefinde required parameters to ParameterTool
Key: FLINK-2017
URL: https://issues.apache.org/jira/browse/FLINK-2017
Project: Flink
Issue Type: Improvement
Affects Versions: 0.9
Reporter: Robert Metzger
In FLINK-1525 we've added the {{ParameterTool}}.
During the PR review, there was a request for required parameters.
This issue is about implementing a facility to define required parameters. The
tool should also be able to print a help menu with a list of all parameters.
This test case shows my initial ideas how to design the API
{code}
@Test
public void requiredParameters() {
RequiredParameters required = new RequiredParameters();
Option input = required.add("input").alt("i").help("Path to
input file or directory"); // parameter with long and short variant
required.add("output"); // parameter only with long variant
Option parallelism =
required.add("parallelism").alt("p").type(Integer.class); // parameter with type
Option spOption =
required.add("sourceParallelism").alt("sp").defaultValue(12).help("Number
specifying the number of parallel data source instances"); // parameter with
default value, specifying the type.
Option executionType =
required.add("executionType").alt("et").defaultValue("pipelined").choices("pipelined",
"batch");
ParameterUtil parameter = ParameterUtil.fromArgs(new
String[]{"-i", "someinput", "--output", "someout", "-p", "15"});
required.check(parameter);
required.printHelp();
required.checkAndPopulate(parameter);
String inputString = input.get();
int par = parallelism.getInteger();
String output = parameter.get("output");
int sourcePar = parameter.getInteger(spOption.getName());
}
{code}
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