Chesnay Schepler created FLINK-6577:
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Summary: Expand supported types for ConfigOptions
Key: FLINK-6577
URL: https://issues.apache.org/jira/browse/FLINK-6577
Project: Flink
Issue Type: Wish
Components: Configuration
Reporter: Chesnay Schepler
The type of a {{ConfigOption}} is currently limited to the types the that
{{Configuration}} supports, which boils down to basic types and byte arrays.
It would be useful if they could also return things like enums, or the recently
added {{MemorySize}}.
I propose adding a {{fromConfiguration(Configuration}} method to the
{{ConfigOption}} class.
{code}
// ConfigOption definition
ConfigOption<MemorySize> MEMORY =
key("memory")
.defaultValue(new MemorySize(12345))
.from(new ExtractorFunction<MemorySize>() {
MemorySize extract(Configuration config) {
// add check for unconfigured option
return MemorySize.parse(config.getString("memory");}
});
// usage
MemorySize memory = MEMORY.fromConfiguration(config);
// with default
MemorySize memory = MEMORY.fromConfiguration(config, new MemorySize(12345);
// internals of ConfigOption#fromConfiguration
<T> fromConfiguration(Configuration config) {
if (this.extractor == null) { // throw error or something }
T value = this.extractor.extract(config);
return value == null ? defaultValue : value;
}
{code}
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