org.apache.flink.statefun.sdk.match

Class MatchBinder

java.lang.Object

org.apache.flink.statefun.sdk.match.MatchBinder

public final class MatchBinder
extends java.lang.Object

Binds patterns to be matched on inputs and their corresponding actions to the processing logic of a StatefulMatchFunction.

The following methods are supported for binding patterns, in order of precedence that they are checked for matches:

• predicate(Class, Predicate, BiConsumer): matches on the input's type and a conditional predicate on the input object state.
• predicate(Class, BiConsumer): simple type match on the input's type.
• otherwise(BiConsumer): default action to take if no match can be found for the input.

Method Summary

Modifier and Type	Method and Description
MatchBinder	otherwise(java.util.function.BiConsumer<Context,java.lang.Object> action) Binds a default action for inputs that fail to match any of the patterns bind via the predicate(Class, Predicate, BiConsumer) and predicate(Class, BiConsumer) methods.
<T> MatchBinder	predicate(java.lang.Class<T> type, java.util.function.BiConsumer<Context,T> action) Binds a simple type pattern which matches on the input's type.
<T> MatchBinder	predicate(java.lang.Class<T> type, java.util.function.Predicate<T> predicate, java.util.function.BiConsumer<Context,T> action) Binds a pattern which matches on a function's input type, as well as a conditional predicate on the input object's state.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

predicate

public <T> MatchBinder predicate(java.lang.Class<T> type,
                                 java.util.function.BiConsumer<Context,T> action)

Binds a simple type pattern which matches on the input's type.

This has a lower precedence than matches found on patterns registered via predicate(Class, Predicate, BiConsumer). If no conditional predicates matches for a given input of type type, then the action registered here will be used.

Type Parameters:

T - the expected input type.

Parameters:

type - the expected input type.

action - the action to take if this pattern matches.

Returns:

the binder, with predicate bound

predicate

public <T> MatchBinder predicate(java.lang.Class<T> type,
                                 java.util.function.Predicate<T> predicate,
                                 java.util.function.BiConsumer<Context,T> action)

Binds a pattern which matches on a function's input type, as well as a conditional predicate on the input object's state.

Precedence of conditional predicate matches is determined by the order in which they were bind; predicates that were bind first have higher precedence. Patterns bind via this method have the highest precedence over other methods.

Type Parameters:

T - the expected input type.

Parameters:

type - the expected input type.

predicate - a predicate on the input object state to match on.

action - the action to take if this patten matches.

Returns:

the binder, with predicate bound

otherwise

public MatchBinder otherwise(java.util.function.BiConsumer<Context,java.lang.Object> action)

Binds a default action for inputs that fail to match any of the patterns bind via the predicate(Class, Predicate, BiConsumer) and predicate(Class, BiConsumer) methods. If no default action was bind using this method, then a IllegalStateException would be thrown for inputs that fail to match.

Parameters:

action - the default action

Returns:

the binder, with default action bound