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## cascading.flow.stream
Class MemorySpliceGate

    java.lang.Object
      cascading.flow.stream.Duct<Incoming,Outgoing>
          cascading.flow.stream.Gate<TupleEntry,Grouping<TupleEntry,TupleEntryIterator>>
              cascading.flow.stream.SpliceGate
                  cascading.flow.stream.MemorySpliceGate

All Implemented Interfaces:
  Collapsing, ElementDuct

Direct Known Subclasses:
  LocalGroupByGate, MemoryCoGroupGate, MemoryHashJoinGate

    public abstract class MemorySpliceGate

extends SpliceGate

Nested Class Summary
`protected class` | `MemorySpliceGate.DelegatedTuple`

Nested classes/interfaces inherited from class cascading.flow.stream.SpliceGate
`SpliceGate.Role`

Field Summary
`protected MemoryCoGroupClosure` | `closure`
`protected AtomicInteger` | `count`
`protected Comparator<Tuple>[]` | `groupComparators`
`protected TupleHasher` | `groupHasher`
`protected Set<Tuple>` | `keys`
`protected Map<Tuple,Collection<Tuple>>[]` | `keyValues`
`protected boolean` | `nullsAreNotEqual`
`protected int` | `numIncomingPaths`
`protected Map<Duct,Integer>` | `posMap`
`protected Comparator<Tuple>[]` | `valueComparators`

Fields inherited from class cascading.flow.stream.SpliceGate
`flowProcess, grouping, incomingScopes, keyBuilder, keyEntry, keyFields, orderedPrevious, outgoingScopes, role, sortBuilder, sortFields, splice, tupleEntryIterator, valuesBuilder, valuesFields`

Fields inherited from class cascading.flow.stream.Gate
`allPrevious`

Fields inherited from class cascading.flow.stream.Duct
`next`

Constructor Summary
`MemorySpliceGate(FlowProcess flowProcess, Splice splice)`

Method Summary
`void` | `bind(StreamGraph streamGraph)`
`protected TupleBuilder` | `createDefaultNarrowBuilder(Fields incomingFields, Fields narrowFields)`
`protected Set<Tuple>` | `createKeySet()`
`protected Map<Tuple,Collection<Tuple>>[]` | `createKeyValuesArray()` This lets us just replace an old map and let the gc cleanup, vs clearing each map
`protected Map<Tuple,Collection<Tuple>>` | `createTupleMap()`
`protected Tuple` | `getDelegatedTuple(Tuple object)` This allows the tuple to honor the hasher and comparators, if any
`protected Comparator` | `getKeyComparator()`
`void` | `initialize()` Called immediately after bind
`protected abstract boolean` | `isBlockingStreamed()`
`void` | `prepare()`

Methods inherited from class cascading.flow.stream.SpliceGate
`addIncomingScope, addOutgoingScope, cleanup, createNarrowBuilder, createNulledBuilder, equals, getBranchNames, getFlowElement, getIncomingScopes, getOutgoingScopes, handleException, handleReThrowableException, hashCode, hasTrapHandler, makePosMap, orderDucts, setBranchNames, setTrapHandler, toString`

Methods inherited from class cascading.flow.stream.Gate
`getAllPreviousFor`

Methods inherited from class cascading.flow.stream.Duct
`complete, getNext, getNextFor, receive, receiveFirst, start`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Field Detail

### posMap

    protected final Map<Duct,Integer> posMap

### groupComparators

    protected Comparator<Tuple>[] groupComparators

### valueComparators

    protected Comparator<Tuple>[] valueComparators

### groupHasher

    protected TupleHasher groupHasher

### nullsAreNotEqual

    protected boolean nullsAreNotEqual

### keys

    protected Set<Tuple> keys

### keyValues

    protected Map<Tuple,Collection<Tuple>>[] keyValues

### closure

    protected MemoryCoGroupClosure closure

### numIncomingPaths

    protected int numIncomingPaths

### count

    protected final AtomicInteger count

Constructor Detail

### MemorySpliceGate

    public MemorySpliceGate(FlowProcess flowProcess,
                            Splice splice)

Method Detail

### bind

    public void bind(StreamGraph streamGraph)

  Overrides:
    `bind` in class `Gate<TupleEntry,Grouping<TupleEntry,TupleEntryIterator>>`

### createDefaultNarrowBuilder

    protected TupleBuilder createDefaultNarrowBuilder(Fields incomingFields,
                                                      Fields narrowFields)

  Overrides:
    `createDefaultNarrowBuilder` in class `SpliceGate`

### initialize

    public void initialize()

  Description copied from class: `Duct`
  Called immediately after bind

  Overrides:
    `initialize` in class `SpliceGate`

### prepare

    public void prepare()

  Overrides:
    `prepare` in class `Duct<TupleEntry,Grouping<TupleEntry,TupleEntryIterator>>`

### getKeyComparator

    protected Comparator getKeyComparator()

### createKeySet

    protected Set<Tuple> createKeySet()

### createKeyValuesArray

    protected Map<Tuple,Collection<Tuple>>[] createKeyValuesArray()

  This lets us just replace an old map and let the gc cleanup, vs clearing each map

  Returns:
    of type Map

### createTupleMap

    protected Map<Tuple,Collection<Tuple>> createTupleMap()

### getDelegatedTuple

    protected final Tuple getDelegatedTuple(Tuple object)

  This allows the tuple to honor the hasher and comparators, if any

  Parameters:
    `object` - the tuple to wrap
  Returns:
    a DelegatedTuple instance

### isBlockingStreamed

    protected abstract boolean isBlockingStreamed()

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