EricJoy2048 commented on issue #3272:
URL:
https://github.com/apache/incubator-seatunnel/issues/3272#issuecomment-1301558940
> `org.apache.seatunnel.api.table.factory.Factory` can be used directly,
this can also support the options of catalog and format. (can see #2490), I
think this is necessary.
>
> **Discover the existing source, sink, and catalog**
>
> ```java
> // org.apache.seatunnel.api.table.factory.FactoryUtil#discoverFactories
> public static <T extends Factory> List<T>
discoverFactories(ClassLoader classLoader, Class<T> factoryClass) {
> final List<Factory> factories = discoverFactories(classLoader);
> return factories.stream()
> .filter(f -> factoryClass.isAssignableFrom(f.getClass()))
> .map(f -> (T) f)
> .collect(Collectors.toList());
> }
> ```
>
> **Gets a list of options for a source**
>
> ```java
> // org.apache.seatunnel.api.table.factory.FactoryUtil#discoverFactory
> // example for kafka source
> OptionRule rule =
FactoryUtil.discoverFactory(Thread.currentThread().getContextClassLoader(),
TableSourceFactory.class, "kafka")
> .optionRule();
> ```
>
> **Option rule example**
>
> @hk-lrzy The option rule contains a list of options
>
> ```java
> // option example
> Option<String> TEST_TOPIC_PATTERN = Options.key("option.topic-pattern")
> .stringType()
> .noDefaultValue()
> .withDescription("test string type");
>
> // simple rule
> OptionRule simpleRule = OptionRule.builder()
> .optional(POLL_TIMEOUT, POLL_INTERVAL)
> .required(CLIENT_SERVICE_URL)
> .build();
>
> // basic full rule
> OptionRule fullRule = OptionRule.builder()
> .optional(POLL_TIMEOUT, POLL_INTERVAL, CURSOR_STARTUP_MODE)
> .required(CLIENT_SERVICE_URL, ADMIN_SERVICE_URL)
> .exclusive(TOPIC_PATTERN, TOPIC)
> .conditional(CURSOR_STARTUP_MODE, StartMode.TIMESTAMP,
CURSOR_STARTUP_TIMESTAMP)
> .build();
>
> // complex conditional rule
> // moot expression
> Expression expression = Expression.of(TOPIC_DISCOVERY_INTERVAL, 200)
> .and(Expression.of(Condition.of(CURSOR_STARTUP_MODE,
StartMode.EARLIEST)
> .or(CURSOR_STARTUP_MODE, StartMode.LATEST)))
> .or(Expression.of(Condition.of(TOPIC_DISCOVERY_INTERVAL, 100)))
>
> OptionRule complexRule = OptionRule.builder()
> .optional(POLL_TIMEOUT, POLL_INTERVAL, CURSOR_STARTUP_MODE)
> .required(CLIENT_SERVICE_URL, ADMIN_SERVICE_URL)
> .exclusive(TOPIC_PATTERN, TOPIC)
> .conditional(expression, CURSOR_RESET_MODE)
> .build();
> ```
Yes, I see. I will use `Factory `.
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