guozhangwang commented on code in PR #12135:
URL: https://github.com/apache/kafka/pull/12135#discussion_r872593623
##########
streams/src/main/java/org/apache/kafka/streams/kstream/EmitStrategy.java:
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@@ -19,15 +19,52 @@
import org.apache.kafka.streams.kstream.internals.UnlimitedWindow;
import
org.apache.kafka.streams.kstream.internals.emitstrategy.WindowCloseStrategy;
import
org.apache.kafka.streams.kstream.internals.emitstrategy.WindowUpdateStrategy;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.Map;
/**
* This interface controls the strategy that can be used to control how we
emit results in a processor.
*/
public interface EmitStrategy {
+ Logger log = LoggerFactory.getLogger(EmitStrategy.class);
+
enum StrategyType {
- ON_WINDOW_CLOSE,
- ON_WINDOW_UPDATE
+ ON_WINDOW_UPDATE(0, new WindowUpdateStrategy()),
+ ON_WINDOW_CLOSE(1, new WindowCloseStrategy());
+
+ private final short code;
+ private final EmitStrategy strategy;
+
+ private short code() {
+ return this.code;
+ }
+
+ private EmitStrategy strategy() {
+ return this.strategy;
+ }
+
+ StrategyType(final int code, final EmitStrategy strategy) {
+ this.code = (short) code;
+ this.strategy = strategy;
+ }
+
+ private final static Map<Short, EmitStrategy> TYPE_TO_STRATEGY = new
HashMap<>();
+
+ static {
+ for (final StrategyType type : StrategyType.values()) {
+ if (TYPE_TO_STRATEGY.put(type.code(), type.strategy()) != null)
+ throw new IllegalStateException("Code " + type.code() + "
for type " +
Review Comment:
I was following the enum `Errors` as well to add this guard.
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