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GroupByNode< ValueType, KeyExtractor, GroupFunction, HashFunction, UseLocationDetection > Class Template Reference

Detailed Description

template<typename ValueType, typename KeyExtractor, typename GroupFunction, typename HashFunction, bool UseLocationDetection>
class thrill::api::GroupByNode< ValueType, KeyExtractor, GroupFunction, HashFunction, UseLocationDetection >

Definition at line 39 of file group_by_iterator.hpp.

+ Inheritance diagram for GroupByNode< ValueType, KeyExtractor, GroupFunction, HashFunction, UseLocationDetection >:
+ Collaboration diagram for GroupByNode< ValueType, KeyExtractor, GroupFunction, HashFunction, UseLocationDetection >:

#include <group_by_iterator.hpp>

Classes

class  HashCount
 
struct  ValueComparator
 

Public Member Functions

template<typename ParentDIA >
 GroupByNode (const ParentDIA &parent, const KeyExtractor &key_extractor, const GroupFunction &groupby_function, const HashFunction &hash_function=HashFunction())
 Constructor for a GroupByNode. More...
 
void FlushVectorToFile (std::vector< ValueIn > &v)
 Sort and store elements in a file. More...
 
void MainOp ()
 Receive elements from other workers. More...
 
std::pair< size_t, size_t > MaxMergeDegreePrefetch ()
 
void RunUserFunc (data::File &f, bool consume)
 
- Public Member Functions inherited from DOpNode< ValueType >
 DOpNode (Context &ctx, const char *label, const std::initializer_list< size_t > &parent_ids, const std::initializer_list< DIABasePtr > &parents)
 Constructor for a DOpNode, which sets references to the parent nodes. More...
 
 DOpNode (Context &ctx, const char *label, std::vector< size_t > &&parent_ids, std::vector< DIABasePtr > &&parents)
 Constructor for a DOpNode, which sets references to the parent nodes. More...
 
- Public Member Functions inherited from DIANode< ValueType >
 DIANode (Context &ctx, const char *label, const std::initializer_list< size_t > &parent_ids, const std::initializer_list< DIABasePtr > &parents)
 Constructor for a DIANode, which sets references to the parent nodes. More...
 
 DIANode (Context &ctx, const char *label, std::vector< size_t > &&parent_ids, std::vector< DIABasePtr > &&parents)
 Constructor for a DIANode, which sets references to the parent nodes. More...
 
virtual void AddChild (DIABase *node, const Callback &callback=Callback(), size_t parent_index=0)
 Enables children to push their "folded" function chains to their parent. More...
 
std::vector< DIABase * > children () const override
 Returns the children of this DIABase. More...
 
void PushFile (data::File &file, bool consume) const
 
void PushItem (const ValueType &item) const
 Method for derived classes to Push a single item to all children. More...
 
void RemoveAllChildren () override
 
void RemoveChild (DIABase *node) override
 
void RunPushData () override
 
- Public Member Functions inherited from DIABase
 DIABase (Context &ctx, const char *label, const std::initializer_list< size_t > &parent_ids, const std::initializer_list< DIABasePtr > &parents)
 The constructor for a DIABase. More...
 
 DIABase (Context &ctx, const char *label, std::vector< size_t > &&parent_ids, std::vector< DIABasePtr > &&parents)
 The constructor for a DIABase. More...
 
 DIABase (const DIABase &)=delete
 non-copyable: delete copy-constructor More...
 
 DIABase (DIABase &&)=default
 move-constructor: default More...
 
virtual ~DIABase ()
 Virtual destructor for a DIABase. More...
 
virtual size_t consume_counter () const
 Returns consume_counter_. More...
 
Contextcontext ()
 Returns the api::Context of this DIABase. More...
 
virtual void DecConsumeCounter (size_t counter)
 
virtual bool ForwardDataOnly () const
 
const size_t & id () const
 return unique id() of DIANode subclass as stored by StatsNode More...
 
virtual void IncConsumeCounter (size_t counter)
 
const char * label () const
 return label() of DIANode subclass as stored by StatsNode More...
 
mem::Managermem_manager ()
 Return the Context's memory manager. More...
 
DIABaseoperator= (const DIABase &)=delete
 non-copyable: delete assignment operator More...
 
DIABaseoperator= (DIABase &&)=default
 move-assignment operator: default More...
 
std::vector< size_t > parent_ids () const
 Returns the parents of this DIABase. More...
 
const std::vector< DIABasePtr > & parents () const
 Returns the parents of this DIABase. More...
 
void RemoveParent (DIABase *p)
 Remove a parent. More...
 
virtual bool RequireParentPushData (size_t) const
 
void RunScope ()
 
void set_mem_limit (const DIAMemUse &mem_limit)
 
void set_state (const DIAState &state)
 
virtual void SetConsumeCounter (size_t counter)
 
DIAState state () const
 
virtual DIAMemUse PreOpMemUse ()
 Amount of RAM used by PreOp after StartPreOp() More...
 
virtual void StartPreOp (size_t)
 Virtual method for preparing start of PushData. More...
 
virtual bool OnPreOpFile (const data::File &, size_t)
 
virtual void StopPreOp (size_t)
 Virtual method for preparing end of PushData. More...
 
virtual DIAMemUse ExecuteMemUse ()
 Amount of RAM used by Execute() More...
 
virtual void Execute ()=0
 Virtual execution method. Triggers actual computation in sub-classes. More...
 
virtual DIAMemUse PushDataMemUse ()
 Amount of RAM used by PushData() More...
 
virtual void PushData (bool consume)=0
 Virtual method for pushing data. Triggers actual pushing in sub-classes. More...
 
virtual void Dispose ()
 Virtual clear method. Triggers actual disposing in sub-classes. More...
 
- Public Member Functions inherited from ReferenceCounter
 ReferenceCounter () noexcept
 new objects have zero reference count More...
 
 ReferenceCounter (const ReferenceCounter &) noexcept
 coping still creates a new object with zero reference count More...
 
 ~ReferenceCounter ()
 
bool dec_reference () const noexcept
 Call whenever resetting (i.e. More...
 
void inc_reference () const noexcept
 Call whenever setting a pointer to the object. More...
 
ReferenceCounteroperator= (const ReferenceCounter &) noexcept
 assignment operator, leaves pointers unchanged More...
 
size_t reference_count () const noexcept
 Return the number of references to this object (for debugging) More...
 
bool unique () const noexcept
 Test if the ReferenceCounter is referenced by only one CountingPtr. More...
 

Public Attributes

data::CatStream::Writers emitters_
 
std::deque< data::Filefiles_
 
GroupFunction groupby_function_
 
HashFunction hash_function_
 
core::LocationDetection
< HashCount
location_detection_
 
data::File pre_file_
 location detection and associated files More...
 
data::File::Writer pre_writer_
 
data::File sorted_elems_ { context_.GetFile(this) }
 
data::CatStreamPtr stream_ { context_.GetNewCatStream(this) }
 
size_t totalsize_ = 0
 
- Public Attributes inherited from DIABase
common::JsonLogger logger_
 

Private Types

using Key = typename common::FunctionTraits< KeyExtractor >::result_type
 
using Super = DOpNode< ValueType >
 
using ValueIn = typename common::FunctionTraits< KeyExtractor >::template arg_plain< 0 >
 
using ValueOut = ValueType
 

Static Private Attributes

static constexpr bool debug = false
 

Additional Inherited Members

- Public Types inherited from DOpNode< ValueType >
using Super = DIANode< ValueType >
 
- Public Types inherited from DIANode< ValueType >
using Callback = tlx::delegate< void(const ValueType &)>
 
- Public Types inherited from DIABase
using DIABasePtr = tlx::CountingPtr< DIABase >
 
- Static Public Attributes inherited from DIABase
static constexpr size_t kNeverConsume = static_cast<size_t>(-1)
 Never full consume. More...
 
- Protected Attributes inherited from DIANode< ValueType >
std::vector< Childchildren_
 Callback functions from the child nodes. More...
 
- Protected Attributes inherited from DIABase
Contextcontext_
 associated Context More...
 
const size_t id_
 DIA serial id. More...
 
const char *const label_
 DOp node static label. More...
 
DIAState state_ = DIAState::NEW
 State of the DIANode. State is NEW on creation. More...
 
std::vector< DIABasePtrparents_
 Parents of this DIABase. More...
 
DIAMemUse mem_limit_ = 0
 
size_t consume_counter_ = 1
 

Member Typedef Documentation

using Key = typename common::FunctionTraits<KeyExtractor>::result_type
private

Definition at line 53 of file group_by_key.hpp.

using Super = DOpNode<ValueType>
private

Definition at line 50 of file group_by_key.hpp.

using ValueIn = typename common::FunctionTraits<KeyExtractor>::template arg_plain<0>
private

Definition at line 56 of file group_by_key.hpp.

using ValueOut = ValueType
private

Definition at line 54 of file group_by_key.hpp.

Constructor & Destructor Documentation

GroupByNode ( const ParentDIA &  parent,
const KeyExtractor &  key_extractor,
const GroupFunction &  groupby_function,
const HashFunction &  hash_function = HashFunction() 
)
inline

Constructor for a GroupByNode.

Sets the DataManager, parent, stack, key_extractor and reduce_function.

Definition at line 119 of file group_by_key.hpp.

Member Function Documentation

std::pair<size_t, size_t> MaxMergeDegreePrefetch ( )
inline

calculate maximum merging degree from available memory and the number of files. additionally calculate the prefetch size of each File.

Definition at line 373 of file group_by_key.hpp.

References thrill::data::default_block_size, GroupByNode< ValueType, KeyExtractor, GroupFunction, HashFunction, UseLocationDetection >::files_, and DIABase::mem_limit_.

Member Data Documentation

constexpr bool debug = false
staticprivate

Definition at line 48 of file group_by_key.hpp.

Definition at line 297 of file group_by_key.hpp.

HashFunction hash_function_

Definition at line 292 of file group_by_key.hpp.

core::LocationDetection<HashCount> location_detection_

Definition at line 294 of file group_by_key.hpp.

data::File pre_file_

location detection and associated files

Definition at line 304 of file group_by_key.hpp.

data::File::Writer pre_writer_

Definition at line 305 of file group_by_key.hpp.

data::File sorted_elems_ { context_.GetFile(this) }

Definition at line 300 of file group_by_key.hpp.

data::CatStreamPtr stream_ { context_.GetNewCatStream(this) }

The documentation for this class was generated from the following files: