Package com.fluxtion.ext.streaming.builder.stream

Class StreamFunctionCompiler<T,​F>

java.lang.Object
com.fluxtion.ext.streaming.builder.stream.StreamFunctionCompiler<T,​F>
Type Parameters:
T - The test function applied to the filter subject
F - The filter subject under test
public class StreamFunctionCompiler<T,​F>
extends java.lang.Object
Applies filtering logic to a node in the execution graph. The filter invokes a predicate that tests a node for a valid match. The outcome of the match has the following effect:
  • Successful match allows the event wave to propagate.
  • Failed match the event wave stops at the node under test.

Filtering has the following characteristics:

  • Filter functions are either instance or static methods.
  • An instance filter is a node in the SEP and can receive inputs from any other nodes.
  • An instance filter is stateful, the same filter instance will be used across multiple event processing cycles.
  • An instance filter can attach to any SEP life-cycle method such as AfterEvent
  • A filter inspection target can be a method reference or a node in the execution graph.
  • A ,target method reference can return either a primitive or reference types.
  • Fluxtion will cast all supplied values to the receiving type.
  • Lambdas cannot be used as filter predicates use method references.
Below is an example creating a filter on a primitive double property. The filter is an int parameter, Fluxtion manages all casts. 


@SepBuilder(name="FilterTest", packageName="com.fluxtion.testfilter")
 public void buildFilter(SEPConfig cfg) { 
     MyDataHandler dh1 = cfg.addNode(new MyDataHandler("dh1")); 
     filter(lt(34), dh1::getDoubleVal).build();
     filter(positive(), dh1::getIntVal).build(); 
 } 
 ... 
 
 public class NumericValidator {

 //method reference wraps instance test 
 public static SerializableFunction lt(int test) { 
     return (SerializableFunction)new NumericValidator(test)::lessThan; 
 } 
 
 //method reference wraps static test
 public static SerializableFunction positive() { 
     return (SerializableFunction) NumericValidator::positiveInt; 
 }
 
 public int limit;

 public NumericValidator(int limit) { this.limit = limit; }

 public static boolean positiveInt(int d) { return d > 0; }

 public boolean greaterThan(int d) { return d > limit; }

 public boolean lessThan(int d) { return d < limit; } }
Author:
V12 Technology Ltd.

  • Method Summary

    Modifier and Type Method Description
    com.fluxtion.ext.streaming.api.Wrapper<F> build()  
    static <S,​ C> StreamFunctionCompiler consume​(C consumer, java.lang.reflect.Method mappingMethod, S source)  
    static <T,​ R extends java.lang.Boolean>
    StreamFunctionCompiler    		 filter​(com.fluxtion.api.partition.LambdaReflection.SerializableFunction<T,​R> filter, com.fluxtion.api.partition.LambdaReflection.SerializableSupplier<T> supplier)  
    static <T,​ R extends java.lang.Boolean,​ S>
    StreamFunctionCompiler    		 filter​(com.fluxtion.api.partition.LambdaReflection.SerializableFunction<T,​R> filter, S source)  
    static <T,​ R extends java.lang.Boolean,​ S>
    StreamFunctionCompiler    		 filter​(com.fluxtion.api.partition.LambdaReflection.SerializableFunction<T,​R> filter, S source, java.lang.reflect.Method accessor)  
    static <T,​ R extends java.lang.Boolean,​ S,​ F>
    StreamFunctionCompiler    		 filter​(F filter, java.lang.reflect.Method filterMethod, S source)  
    static <T,​ R extends java.lang.Boolean,​ S,​ F>
    StreamFunctionCompiler    		 filter​(F filter, java.lang.reflect.Method filterMethod, S source, java.lang.reflect.Method accessor)  
    static <T,​ R extends java.lang.Boolean,​ S,​ F>
    StreamFunctionCompiler    		 filter​(F filter, java.lang.reflect.Method filterMethod, S source, java.lang.reflect.Method accessor, boolean cast)
    instance filter generation method
    static <T,​ R extends java.lang.Boolean,​ S,​ F>
    StreamFunctionCompiler    		 filter​(java.lang.reflect.Method filterMethod, S source)  
    static <T,​ R extends java.lang.Boolean,​ S,​ F>
    StreamFunctionCompiler    		 filter​(java.lang.reflect.Method filterMethod, S source, java.lang.reflect.Method accessor, boolean cast)
    static filter generation method
    static <S> com.fluxtion.ext.streaming.api.Wrapper<S> get​(com.fluxtion.api.partition.LambdaReflection.SerializableSupplier<S> source)  
    static <S> com.fluxtion.ext.streaming.api.Wrapper get​(java.lang.reflect.Method accessor, S source)  
    static <T,​ R extends java.lang.Boolean,​ S,​ F>
    StreamFunctionCompiler    		 map​(F mapper, java.lang.reflect.Method mappingMethod, com.fluxtion.ext.streaming.api.stream.Argument... args)
    Build a mapping function from n-ary arguments
    static <T,​ R extends java.lang.Boolean,​ S,​ F>
    StreamFunctionCompiler    		 map​(F mapper, java.lang.reflect.Method mappingMethod, S source, java.lang.reflect.Method accessor, boolean cast)  
    static <T,​ R extends java.lang.Boolean,​ S,​ F>
    StreamFunctionCompiler    		 mapSet​(F mapper, java.lang.reflect.Method mappingMethod, com.fluxtion.ext.streaming.api.stream.Argument... args)  
    static <T,​ R extends java.lang.Boolean,​ S,​ F>
    StreamFunctionCompiler    		 push​(F mapper, java.lang.reflect.Method mappingMethod, S source, java.lang.reflect.Method accessor, boolean cast)  
    static <T,​ R extends java.lang.Boolean,​ S,​ F>
    StreamFunctionCompiler    		 test​(F mapper, java.lang.reflect.Method mappingMethod, com.fluxtion.ext.streaming.api.stream.Argument... args)
    Build a Test from n-ary arguments

    Methods inherited from class java.lang.Object

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

  • Method Details

    • filter

      public static <T,​ R extends java.lang.Boolean,​ S,​ F> StreamFunctionCompiler filter​(java.lang.reflect.Method filterMethod, S source, java.lang.reflect.Method accessor, boolean cast)
      static filter generation method
      Type Parameters:
      T -
      R -
      S -
      F -
      Parameters:
      filterMethod -
      source -
      accessor -
      cast -
      Returns:

    • mapSet

      public static <T,​ R extends java.lang.Boolean,​ S,​ F> StreamFunctionCompiler mapSet​(F mapper, java.lang.reflect.Method mappingMethod, com.fluxtion.ext.streaming.api.stream.Argument... args)

    • test

      public static <T,​ R extends java.lang.Boolean,​ S,​ F> StreamFunctionCompiler test​(F mapper, java.lang.reflect.Method mappingMethod, com.fluxtion.ext.streaming.api.stream.Argument... args)
      Build a Test from n-ary arguments
      Type Parameters:
      T -
      R -
      S -
      F -
      Parameters:
      mapper -
      mappingMethod -
      args -
      Returns:

    • map

      public static <T,​ R extends java.lang.Boolean,​ S,​ F> StreamFunctionCompiler map​(F mapper, java.lang.reflect.Method mappingMethod, com.fluxtion.ext.streaming.api.stream.Argument... args)
      Build a mapping function from n-ary arguments
      Type Parameters:
      T -
      R -
      S -
      F -
      Parameters:
      mapper -
      mappingMethod -
      args -
      Returns:

    • map

      public static <T,​ R extends java.lang.Boolean,​ S,​ F> StreamFunctionCompiler map​(F mapper, java.lang.reflect.Method mappingMethod, S source, java.lang.reflect.Method accessor, boolean cast)

    • push

      public static <T,​ R extends java.lang.Boolean,​ S,​ F> StreamFunctionCompiler push​(F mapper, java.lang.reflect.Method mappingMethod, S source, java.lang.reflect.Method accessor, boolean cast)

    • get

      public static <S> com.fluxtion.ext.streaming.api.Wrapper<S> get​(com.fluxtion.api.partition.LambdaReflection.SerializableSupplier<S> source)

    • get

      public static <S> com.fluxtion.ext.streaming.api.Wrapper get​(java.lang.reflect.Method accessor, S source)

    • consume

      public static <S,​ C> StreamFunctionCompiler consume​(C consumer, java.lang.reflect.Method mappingMethod, S source)

    • filter

      public static <T,​ R extends java.lang.Boolean,​ S,​ F> StreamFunctionCompiler filter​(F filter, java.lang.reflect.Method filterMethod, S source, java.lang.reflect.Method accessor, boolean cast)
      instance filter generation method
      Type Parameters:
      T -
      R -
      S -
      F -
      Parameters:
      filter -
      filterMethod -
      source -
      accessor -
      cast -
      Returns:

    • filter

      public static <T,​ R extends java.lang.Boolean,​ S,​ F> StreamFunctionCompiler filter​(F filter, java.lang.reflect.Method filterMethod, S source, java.lang.reflect.Method accessor)

    • filter

      public static <T,​ R extends java.lang.Boolean,​ S,​ F> StreamFunctionCompiler filter​(F filter, java.lang.reflect.Method filterMethod, S source)

    • filter

      public static <T,​ R extends java.lang.Boolean,​ S,​ F> StreamFunctionCompiler filter​(java.lang.reflect.Method filterMethod, S source)

    • filter

      public static <T,​ R extends java.lang.Boolean,​ S> StreamFunctionCompiler filter​(com.fluxtion.api.partition.LambdaReflection.SerializableFunction<T,​R> filter, S source, java.lang.reflect.Method accessor)

    • filter

      public static <T,​ R extends java.lang.Boolean,​ S> StreamFunctionCompiler filter​(com.fluxtion.api.partition.LambdaReflection.SerializableFunction<T,​R> filter, S source)

    • filter

      public static <T,​ R extends java.lang.Boolean> StreamFunctionCompiler filter​(com.fluxtion.api.partition.LambdaReflection.SerializableFunction<T,​R> filter, com.fluxtion.api.partition.LambdaReflection.SerializableSupplier<T> supplier)

    • build

      public com.fluxtion.ext.streaming.api.Wrapper<F> build()