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https://issues.apache.org/jira/browse/FLINK-6577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16017545#comment-16017545
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Greg Hogan commented on FLINK-6577:
-----------------------------------
Sorry about that. Too much tab hopping.
> 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
> Priority: Trivial
>
> 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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