Package io.activej.aggregation.util

Class Utils

java.lang.Object

io.activej.aggregation.util.Utils

public class Utils
extends Object

Constructor Summary

Constructors

Constructor	Description
Utils()

Method Summary

Modifier and Type	Method	Description
static <K extends Comparable, I, O, A> StreamReducers.Reducer<K,I,O,A>	aggregationReducer(AggregationStructure aggregation, Class<I> inputClass, Class<O> outputClass, List<String> keys, List<String> fields, Map<String,Measure> extraFields, DefiningClassLoader classLoader)
static <C> Set<C>	collectChunkIds(Collection<AggregationChunk> chunks)
static <T> io.activej.serializer.BinarySerializer<T>	createBinarySerializer(AggregationStructure aggregation, Class<T> recordClass, List<String> keys, List<String> fields, DefiningClassLoader classLoader)
static <K extends Comparable> Class<K>	createKeyClass(Map<String,FieldType> keys, DefiningClassLoader classLoader)
static <R> Comparator<R>	createKeyComparator(Class<R> recordClass, List<String> keys, DefiningClassLoader classLoader)
static <K extends Comparable, R> Function<R,K>	createKeyFunction(Class<R> recordClass, Class<K> keyClass, List<String> keys, DefiningClassLoader classLoader)
static <T, R> Function<T,R>	createMapper(Class<T> recordClass, Class<R> resultClass, List<String> keys, List<String> fields, DefiningClassLoader classLoader)
static PartitionPredicate	createPartitionPredicate(Class recordClass, List<String> partitioningKey, DefiningClassLoader classLoader)
static <I, O> Aggregate<O,Object>	createPreaggregator(AggregationStructure aggregation, Class<I> inputClass, Class<O> outputClass, Map<String,String> keyFields, Map<String,String> measureFields, DefiningClassLoader classLoader)
static <T> Class<T>	createRecordClass(AggregationStructure aggregation, Collection<String> keys, Collection<String> fields, DefiningClassLoader classLoader)
static <T> Class<T>	createRecordClass(Map<String,FieldType> keys, Map<String,FieldType> fields, DefiningClassLoader classLoader)
static <T> Map<String,String>	scanKeyFields(Class<T> inputClass)
static <T> Map<String,String>	scanMeasureFields(Class<T> inputClass)
static <T> PartitionPredicate<T>	singlePartition()

Methods inherited from class java.lang.Object

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

Constructor Details

Utils

public Utils()

Method Details

createKeyClass

public static <K extends Comparable> Class<K> createKeyClass(Map<String,FieldType> keys,
 DefiningClassLoader classLoader)

createKeyComparator

public static <R> Comparator<R> createKeyComparator(Class<R> recordClass,
 List<String> keys,
 DefiningClassLoader classLoader)

createMapper

public static <T,
R> Function<T,R> createMapper(Class<T> recordClass,
 Class<R> resultClass,
 List<String> keys,
 List<String> fields,
 DefiningClassLoader classLoader)

createKeyFunction

public static <K extends Comparable,
R>
Function<R,K> createKeyFunction(Class<R> recordClass,
 Class<K> keyClass,
 List<String> keys,
 DefiningClassLoader classLoader)

createRecordClass

public static <T> Class<T> createRecordClass(AggregationStructure aggregation,
 Collection<String> keys,
 Collection<String> fields,
 DefiningClassLoader classLoader)

createRecordClass

public static <T> Class<T> createRecordClass(Map<String,FieldType> keys,
 Map<String,FieldType> fields,
 DefiningClassLoader classLoader)

createBinarySerializer

public static <T>
io.activej.serializer.BinarySerializer<T> createBinarySerializer(AggregationStructure aggregation,
 Class<T> recordClass,
 List<String> keys,
 List<String> fields,
 DefiningClassLoader classLoader)

aggregationReducer

public static <K extends Comparable,
I,
O,
A>
StreamReducers.Reducer<K,I,O,A> aggregationReducer(AggregationStructure aggregation,
 Class<I> inputClass,
 Class<O> outputClass,
 List<String> keys,
 List<String> fields,
 Map<String,Measure> extraFields,
 DefiningClassLoader classLoader)

createPreaggregator

public static <I,
O> Aggregate<O,Object> createPreaggregator(AggregationStructure aggregation,
 Class<I> inputClass,
 Class<O> outputClass,
 Map<String,String> keyFields,
 Map<String,String> measureFields,
 DefiningClassLoader classLoader)

singlePartition

public static <T> PartitionPredicate<T> singlePartition()

createPartitionPredicate

public static PartitionPredicate createPartitionPredicate(Class recordClass,
 List<String> partitioningKey,
 DefiningClassLoader classLoader)

scanKeyFields

public static <T> Map<String,String> scanKeyFields(Class<T> inputClass)

scanMeasureFields

public static <T> Map<String,String> scanMeasureFields(Class<T> inputClass)

collectChunkIds

public static <C> Set<C> collectChunkIds(Collection<AggregationChunk> chunks)