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OtlDataManager.pas
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OtlDataManager.pas
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///<summary>Data consumer with parallelization support (backend for the OtlParallel unit).</summary>
///<author>Primoz Gabrijelcic</author>
///<license>
///This software is distributed under the BSD license.
///
///Copyright (c) 2016, Primoz Gabrijelcic
///All rights reserved.
///
///Redistribution and use in source and binary forms, with or without modification,
///are permitted provided that the following conditions are met:
///- Redistributions of source code must retain the above copyright notice, this
/// list of conditions and the following disclaimer.
///- Redistributions in binary form must reproduce the above copyright notice,
/// this list of conditions and the following disclaimer in the documentation
/// and/or other materials provided with the distribution.
///- The name of the Primoz Gabrijelcic may not be used to endorse or promote
/// products derived from this software without specific prior written permission.
///
///THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
///ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
///WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
///DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
///ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
///(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
///LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
///ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
///(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
///SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
///</license>
///<remarks><para>
/// Home : http:https://www.omnithreadlibrary.com
/// Support : https://plus.google.com/communities/112307748950248514961
/// Author : Primoz Gabrijelcic
/// E-Mail : [email protected]
/// Blog : http:https://thedelphigeek.com
/// Contributors : GJ, Lee_Nover, Sean B. Durkin
///
/// Creation date : 2010-04-13
/// Last modification : 2016-06-30
/// Version : 1.01a
///</para><para>
/// History:
/// 1.01a: 2016-06-30
/// - TOmniValueEnumeratorDataPackage.Add was incrementing refcount for refcounted
/// data one time too many. This caused memory leaks when iterating over
/// interfaced types in Parallel.For.
/// 1.01: 2015-10-04
/// - Imported mobile support by [Sean].
/// 1.0a: 2013-10-19
/// - Don't crash if the source is empty.
/// 1.0: 2010-12-10
/// - Created.
///</para></remarks>
unit OtlDataManager;
{$I OtlOptions.inc}
interface
uses
OtlCommon,
OtlContainers,
OtlCollections;
type
///<summary>Source provider capabilities.</summary>
TOmniSourceProviderCapability = (
spcCountable, // source provider that knows how much data it holds
spcFast, // source provider operations are O(1)
spcDataLimit // data package can only hold limited amount of data
);
TOmniSourceProviderCapabilities = set of TOmniSourceProviderCapability;
///<summary>Wrapper around a (type specific) data package. All methods can and will be
/// called from multiple threads at the same time!</summary>
TOmniDataPackage = class abstract
public
function GetNext(var value: TOmniValue): boolean; overload; virtual; abstract;
function GetNext(var position: int64; var value: TOmniValue): boolean; overload; virtual; abstract;
function Split(package: TOmniDataPackage): boolean; virtual; abstract;
end; { TOmniDataPackage }
///<summary>Output data buffer.</summary>
TOmniOutputBuffer = class abstract
public
procedure Submit(position: int64; const data: TOmniValue); virtual; abstract;
end; { TOmniOutputBuffer }
///<summary>A data package queue between a single worker and shared data manager.</summary>
TOmniLocalQueue = class abstract
public
procedure AssociateBuffer(buffer: TOmniOutputBuffer); virtual; abstract;
function GetNext(var value: TOmniValue): boolean; overload; virtual; abstract;
function GetNext(var position: int64; var value: TOmniValue): boolean; overload; virtual; abstract;
function Split(package: TOmniDataPackage): boolean; virtual; abstract;
end; { TOmniLocalQueue }
///<summary>Wrapper around the data source. All methods can and will be called from
/// multiple threads at the same time!</summary>
TOmniSourceProvider = class abstract
public
function Count: int64; virtual; abstract;
function CreateDataPackage: TOmniDataPackage; virtual; abstract;
function GetCapabilities: TOmniSourceProviderCapabilities; virtual; abstract;
function GetPackage(dataCount: integer; package: TOmniDataPackage): boolean; virtual; abstract;
function GetPackageSizeLimit: integer; virtual; abstract;
end; { TOmniSourceProvider }
TOmniDataManagerOption = (dmoPreserveOrder);
TOmniDataManagerOptions = set of TOmniDataManagerOption;
///<summary>Data manager. All methods can and will be called from multiple threads
/// at the same time!</summary>
TOmniDataManager = class abstract
public
function CreateLocalQueue: TOmniLocalQueue; virtual; abstract;
function AllocateOutputBuffer: TOmniOutputBuffer; virtual; abstract;
function GetNext(package: TOmniDataPackage): boolean; virtual; abstract;
procedure ReleaseOutputBuffer(buffer: TOmniOutputBuffer); virtual; abstract;
procedure SetOutput(const queue: IOmniBlockingCollection); overload; virtual; abstract;
end; { TOmniDataManager }
function CreateSourceProvider(low, high: integer; step: integer = 1): TOmniSourceProvider; overload;
function CreateSourceProvider(enumerator: TOmniValueEnumerator): TOmniSourceProvider; overload;
function CreateSourceProvider(enumerator: IOmniValueEnumerator): TOmniSourceProvider; overload;
function CreateSourceProvider(enumerator: IEnumerator): TOmniSourceProvider; overload;
function CreateDataManager(sourceProvider: TOmniSourceProvider; numWorkers: integer;
options: TOmniDataManagerOptions): TOmniDataManager;
implementation
uses
{$IFDEF MSWINDOWS}
Windows,
Contnrs,
DSiWin32,
{$ELSE}
System.Diagnostics,
{$ENDIF}
GpLists,
SysUtils,
Classes,
{$IFDEF OTL_HasSystemTypes}
System.Types,
{$ENDIF}
OtlSync;
const
CNumBuffersInSet = 2;
type
TOmniPositionRange = record
First: int64;
Last : int64;
constructor Create(aFirst, aLast: int64);
class function Empty: TOmniPositionRange; static;
end; { TOmniPositionRange }
///<summary>Base class for all data package classes.</summary>
TOmniDataPackageBase = class abstract(TOmniDataPackage)
private
dpbGeneration: integer;
dpbRange : TOmniPositionRange;
dpbQueue : TOmniLocalQueue;
public
procedure NextGeneration; inline;
property Generation: integer read dpbGeneration;
property Range: TOmniPositionRange read dpbRange write dpbRange;
property Queue: TOmniLocalQueue read dpbQueue write dpbQueue;
end; { TOmniDataPackageBase }
///<summary>Integer range data package.</summary>
TOmniIntegerDataPackage = class(TOmniDataPackageBase)
strict private
idpHigh : int64;
idpHighSign: int64;
idpLow : TOmniAlignedInt64;
idpPosition: integer;
idpSign : integer;
idpStep : integer;
idpStepAbs : integer;
public
function GetNext(var value: TOmniValue): boolean; overload; override;
function GetNext(var position: int64; var value: TOmniValue): boolean; overload; override;
function HasData: boolean;
procedure Initialize(low, high, step: integer; newRange: TOmniPositionRange);
function Split(package: TOmniDataPackage): boolean; override;
end; { TOmniIntegerDataPackage }
///<summary>Data package storing a list of TOmniValues.</summary>
TOmniValueEnumeratorDataPackage = class(TOmniDataPackageBase)
strict private
const CMaxValueEnumeratorDataPackageSize = 1024; // pretty arbitrary, should do some performance tests
strict private
vedpApproxCount: TOmniAlignedInt32;
vedpDataQueue : TOmniBaseQueue; //TOmniBaseBoundedQueue;
public
constructor Create;
destructor Destroy; override;
class function GetPackageSizeLimit: integer;
procedure Add(const value: TOmniValue);
function GetNext(var value: TOmniValue): boolean; overload; override;
function Prepare(dataCount: integer): integer;
function Split(package: TOmniDataPackage): boolean; override;
end; { TOmniValueEnumeratorDataPackage }
TOmniSourceProviderBase = class(TOmniSourceProvider)
strict private
spbStorePositions: boolean;
public
property StorePositions: boolean read spbStorePositions write spbStorePositions;
end; { TOmniSourceProviderBase }
///<summary>Integer range source provider.</summary>
TOmniIntegerRangeProvider = class(TOmniSourceProviderBase)
strict private
irpCount : TOmniAlignedInt32;
irpHigh : integer;
irpLock : TOmniCS;
irpLow : integer;
irpPosition: integer;
irpStep : integer;
strict protected
function CalcCount(low, high, step: integer): integer; inline;
public
constructor Create(low, high, step: integer);
function Count: int64; override;
function CreateDataPackage: TOmniDataPackage; override;
function GetCapabilities: TOmniSourceProviderCapabilities; override;
function GetPackage(dataCount: integer; package: TOmniDataPackage): boolean; override;
function GetPackageSizeLimit: integer; override;
end; { TOmniIntegerRangeProvider }
///<summary>TOmniValue source provider supporting mutable collections and parallel enumerators.</summary>
TOmniValueEnumeratorProvider = class(TOmniSourceProviderBase)
strict protected
vepEnumerator: IOmniValueEnumerator;
public
constructor Create(enumerator: IOmniValueEnumerator);
function Count: int64; override;
function CreateDataPackage: TOmniDataPackage; override;
function GetCapabilities: TOmniSourceProviderCapabilities; override;
function GetPackage(dataCount: integer; package: TOmniDataPackage): boolean; override;
function GetPackageSizeLimit: integer; override;
end; { TOmniValueEnumeratorProvider }
TOmniEnumeratorProvider = class(TOmniSourceProviderBase)
strict private
epEnumeratorIntf: IEnumerator;
epEnumeratorObj : TOmniValueEnumerator;
epEnumLock : TOmniCS;
public
constructor Create(enumerator: IEnumerator); overload;
constructor Create(enumerator: TOmniValueEnumerator); overload;
function Count: int64; override;
function CreateDataPackage: TOmniDataPackage; override;
function GetCapabilities: TOmniSourceProviderCapabilities; override;
function GetPackage(dataCount: integer; package: TOmniDataPackage): boolean; override;
function GetPackageSizeLimit: integer; override;
property EnumeratorIntf: IEnumerator read epEnumeratorIntf;
property EnumeratorObj: TOmniValueEnumerator read epEnumeratorObj;
end; { TOmniEnumeratorProvider }
TOmniBaseDataManager = class;
///<summary>Output buffer implementation.</summary>
TOmniOutputBufferImpl = class(TOmniOutputBuffer)
strict private
obiBuffer : TOmniBlockingCollection;
obiDataManager_ref: TOmniBaseDataManager;
obiEmptyEvent : TOmniTransitionEvent;
obiFull : boolean;
obiHasData : boolean;
obiNextPosition : int64;
obiOutput : IOmniBlockingCollection;
obiRange : TOmniPositionRange;
strict protected
procedure SetRange(range: TOmniPositionRange);
public
constructor Create(owner: TOmniBaseDataManager; output: IOmniBlockingCollection;
const AShareLock: IOmniCriticalSection = nil);
destructor Destroy; override;
procedure CopyToOutput;
procedure MarkFull;
procedure Submit(position: int64; const data: TOmniValue); override;
property EmptyEvent: TOmniTransitionEvent read obiEmptyEvent;
property IsFull: boolean read obiFull;
property Range: TOmniPositionRange read obiRange write SetRange;
end; { TOmniOutputBufferImpl }
TOmniOutputBufferSet = class(TOmniOutputBuffer)
strict private
obsActiveBuffer_ref: TOmniOutputBufferImpl;
obsShareLock : IOmniCriticalSection;
obsBuffers : array [1..CNumBuffersInSet] of TOmniOutputBufferImpl;
{$IFDEF MSWINDOWS}
obsActiveIndex : integer;
obsWaitHandles : array[1..CNumBuffersInSet] of THandle;
{$ELSE}
obsWaitEvents : TWaitFor;
{$ENDIF}
public
constructor Create(owner: TOmniBaseDataManager; output: IOmniBlockingCollection);
destructor Destroy; override;
procedure ActivateBuffer;
procedure Submit(position: int64; const data: TOmniValue); override;
property ActiveBuffer: TOmniOutputBufferImpl read obsActiveBuffer_ref;
end; { TOmniOutputBufferSet }
///<summary>Local queue implementation.</summary>
TOmniLocalQueueImpl = class(TOmniLocalQueue)
strict private
lqiBufferSet : TOmniOutputBufferSet;
lqiDataManager_ref: TOmniBaseDataManager;
lqiDataPackage : TOmniDataPackageBase;
public
constructor Create(owner: TOmniBaseDataManager);
destructor Destroy; override;
procedure AssociateBuffer(buffer: TOmniOutputBuffer); override;
function GetNext(var value: TOmniValue): boolean; overload; override;
function GetNext(var position: int64; var value: TOmniValue): boolean; overload; override;
function Split(package: TOmniDataPackage): boolean; override;
end; { TOmniLocalQueueImpl }
///<summary>Base data manager class.</summary>
TOmniBaseDataManager = class abstract (TOmniDataManager)
strict private
const CMaxPreserveOrderPackageSize = 1024; // pretty arbitrary, should do some performance tests
strict private
dmBufferRangeList : TGpInt64ObjectList;
dmBufferRangeLock : TOmniCS;
dmNextPosition : int64;
dmNumWorkers : integer;
dmOptions : TOmniDataManagerOptions;
dmOutputIntf : IOmniBlockingCollection;
dmPacketSizes : array of integer;
dmQueueList : TObjectList;
dmQueueLock : TOmniCS;
dmSourceProvider_ref: TOmniSourceProviderBase;
dmStealIdx : integer;
dmUnusedBuffers : TObjectList;
dmUnusedBuffersLock : TOmniCS;
strict protected
function GetBufferList(idxBuffer: integer): TOmniOutputBufferImpl; inline;
function GetSourceProvider: TOmniSourceProvider;
procedure InitializePacketSizes;
property BufferList[idxBuffer: integer]: TOmniOutputBufferImpl read GetBufferList;
public
constructor Create(sourceProvider: TOmniSourceProvider; numWorkers: integer;
options: TOmniDataManagerOptions);
destructor Destroy; override;
function AllocateOutputBuffer: TOmniOutputBuffer; override;
function CreateLocalQueue: TOmniLocalQueue; override;
function GetDataCountForGeneration(generation: integer): integer;
function GetNext(package: TOmniDataPackage): boolean; override;
function GetNextFromProvider(package: TOmniDataPackage;
generation: integer): boolean; virtual; abstract;
procedure LocalQueueDestroyed(queue: TOmniLocalQueue);
procedure NotifyBufferFull(buffer: TOmniOutputBufferImpl);
procedure NotifyBufferRangeChanged(buffer: TOmniOutputBufferImpl);
procedure ReleaseOutputBuffer(buffer: TOmniOutputBuffer); override;
procedure SetOutput(const queue: IOmniBlockingCollection); overload; override;
function StealPackage(package: TOmniDataPackage): boolean;
property SourceProvider: TOmniSourceProvider read GetSourceProvider;
end; { TOmniBaseDataManager }
///<summary>Data manager for countable data.</summary>
TOmniCountableDataManager = class(TOmniBaseDataManager)
public
function GetNextFromProvider(package: TOmniDataPackage;
generation: integer): boolean; override;
end; { TOmniCountableDataManager }
///<summary>Data manager for unbounded data.</summary>
TOmniHeuristicDataManager = class(TOmniBaseDataManager)
strict private
const CFetchTimeout_ms = 10;
strict private
hdmEstimatedPackageSize: TOmniAlignedInt32;
{$IFNDEF MSWINDOWS}
FStopWatch: TStopwatch;
{$ENDIF}
public
constructor Create(sourceProvider: TOmniSourceProvider; numWorkers: integer; options:
TOmniDataManagerOptions);
function GetNextFromProvider(package: TOmniDataPackage;
generation: integer): boolean; override;
end; { TOmniHeuristicDataManager }
{ exports }
function CreateSourceProvider(low, high, step: integer): TOmniSourceProvider;
begin
Result := TOmniIntegerRangeProvider.Create(low, high, step);
end; { CreateSourceProvider }
function CreateSourceProvider(enumerator: IOmniValueEnumerator): TOmniSourceProvider;
begin
Result := TOmniValueEnumeratorProvider.Create(enumerator);
end; { CreateSourceProvider }
function CreateSourceProvider(enumerator: IEnumerator): TOmniSourceProvider; overload;
begin
Result := TOmniEnumeratorProvider.Create(enumerator);
end; { CreateSourceProvider }
function CreateSourceProvider(enumerator: TOmniValueEnumerator): TOmniSourceProvider; overload;
begin
Result := TOmniEnumeratorProvider.Create(enumerator);
end; { CreateSourceProvider }
function CreateDataManager(sourceProvider: TOmniSourceProvider; numWorkers: integer;
options: TOmniDataManagerOptions): TOmniDataManager;
begin
if spcCountable in sourceProvider.GetCapabilities then
Result := TOmniCountableDataManager.Create(sourceProvider, numWorkers, options)
else
Result := TOmniHeuristicDataManager.Create(sourceProvider, numWorkers, options);
end; { CreateDataManager }
{ TOmniPositionRange }
constructor TOmniPositionRange.Create(aFirst, aLast: int64);
begin
First := aFirst;
Last := aLast;
end; { TOmniPositionRange.Create }
class function TOmniPositionRange.Empty: TOmniPositionRange;
begin
Result := TOmniPositionRange.Create(0, 0);
end; { TOmniPositionRange.Empty }
{ TOmniDataPackageBase }
procedure TOmniDataPackageBase.NextGeneration;
begin
dpbGeneration := Abs((dpbGeneration SHL 1) + 3) SHR 1;
end; { TOmniDataPackageBase.NextGeneration }
{ TOmniIntegerDataPackage }
function TOmniIntegerDataPackage.GetNext(var value: TOmniValue): boolean;
begin
if not HasData then
Result := false
else begin
value.AsInt64 := idpLow.Add(idpStep);
if idpStep > 0 then
Result := (value.AsInt64 <= idpHigh)
else
Result := (value.AsInt64 >= idpHigh);
end;
end; { TOmniIntegerDataPackage.GetNext }
function TOmniIntegerDataPackage.GetNext(var position: int64; var value: TOmniValue):
boolean;
begin
Result := GetNext(value);
if Result then begin
position := idpPosition;
Inc(idpPosition);
end;
end; { TOmniIntegerDataPackage.GetNext }
function TOmniIntegerDataPackage.HasData: boolean;
begin
Result := idpStep <> 0;
end; { TOmniIntegerDataPackage.HasData }
procedure TOmniIntegerDataPackage.Initialize(low, high, step: integer;
newRange: TOmniPositionRange);
begin
{$IFDEF Debug}Assert(step <> 0);{$ENDIF}
idpLow.Value := low;
idpHigh := high;
idpStep := step;
idpStepAbs := Abs(step);
if idpStep > 0 then
idpSign := 1
else
idpSign := -1;
idpHighSign := idpHigh * idpSign;
Range := newRange;
idpPosition := Range.First;
end; { TOmniIntegerDataPackage.Initialize }
function TOmniIntegerDataPackage.Split(package: TOmniDataPackage): boolean;
var
high : integer;
intPackage: TOmniIntegerDataPackage absolute package;
low : integer;
midSteps : integer;
begin
{$IFDEF Debug}Assert(package is TOmniIntegerDataPackage);{$ENDIF}
if not HasData then
Result := false
else begin
low := idpLow.Value;
if (low * idpSign) > idpHighSign then
Result := false
else begin
midSteps := (((idpHigh - idpLow.Value) div 2 + 1) div idpStep) * idpStep;
low := idpLow.Add(midSteps);
high := low + midSteps - idpStep;
Result := (low * idpSign <= idpHighSign);
if Result and (high * idpSign > idpHighSign) then
high := (idpHigh div idpStepAbs) * idpStepAbs;
if Result then begin
intPackage.Initialize(low, high, idpStep, TOmniPositionRange.Empty);
end;
end;
end;
end; { TOmniIntegerDataPackage.Split }
{ TOmniIntegerRangeProvider }
constructor TOmniIntegerRangeProvider.Create(low, high, step: integer);
begin
inherited Create;
{$IFDEF Debug}Assert(step <> 0);{$ENDIF}
irpLow := low;
irpHigh := high;
irpStep := step;
irpCount.Value := CalcCount(low, high, step);
end; { TOmniIntegerRangeProvider.Create }
function TOmniIntegerRangeProvider.CalcCount(low, high, step: integer): integer;
begin
if step > 0 then
Result := (high - low + step) div step
else
Result := (low - high - step) div (-step);
end; { TOmniIntegerRangeProvider.CalcCount }
function TOmniIntegerRangeProvider.Count: int64;
begin
Result := irpCount.Value;
end; { TOmniIntegerRangeProvider.Count }
function TOmniIntegerRangeProvider.CreateDataPackage: TOmniDataPackage;
begin
Result := TOmniIntegerDataPackage.Create;
end; { TOmniIntegerRangeProvider.CreateDataPackage }
function TOmniIntegerRangeProvider.GetCapabilities: TOmniSourceProviderCapabilities;
begin
Result := [spcCountable, spcFast];
end; { TOmniIntegerRangeProvider.GetCapabilities }
function TOmniIntegerRangeProvider.GetPackage(dataCount: integer; package:
TOmniDataPackage): boolean;
var
high : int64;
intPackage: TOmniIntegerDataPackage absolute package;
begin
{$IFDEF Debug}Assert(package is TOmniIntegerDataPackage);{$ENDIF}
{$IFDEF Debug}Assert(dataCount >= 0);{$ENDIF}
if irpCount.Value <= 0 then
Result := false
else begin
irpLock.Acquire;
try
if dataCount > irpCount.Value then
dataCount := irpCount.Value;
high := irpLow + (dataCount - 1) * irpStep;
intPackage.Initialize(irpLow, high, irpStep, TOmniPositionRange.Create(irpPosition, irpPosition + dataCount - 1));
Inc(irpPosition, dataCount);
irpLow := high + irpStep;
irpCount.Value := CalcCount(irpLow, irpHigh, irpStep);
finally irpLock.Release; end;
Result := true;
end;
end; { TOmniIntegerRangeProvider.GetPackage }
function TOmniIntegerRangeProvider.GetPackageSizeLimit: integer;
begin
raise Exception.Create('No limit for TOmniIntegerRangeProvider packages');
end; { TOmniIntegerRangeProvider.GetPackageSizeLimit }
{ TOmniValueEnumeratorDataPackage }
constructor TOmniValueEnumeratorDataPackage.Create;
begin
inherited Create;
vedpDataQueue := TOmniBaseQueue.Create; //TOmniBaseBoundedQueue.Create;
// vedpDataQueue.Initialize(2*CMaxValueEnumeratorDataPackageSize+2, SizeOf(TOmniValue)); // there are bugs in the TOmniBaseBoundedQueue
end; { TOmniValueEnumeratorDataPackage.Create }
destructor TOmniValueEnumeratorDataPackage.Destroy;
begin
FreeAndNil(vedpDataQueue);
inherited;
end; { TOmniValueEnumeratorDataPackage.Destroy }
procedure TOmniValueEnumeratorDataPackage.Add(const value: TOmniValue);
var
tmp: TOmniValue;
begin
// {$IFDEF Debug} Assert(not vedpDataQueue.IsFull); {$ENDIF}
tmp := value;
vedpDataQueue.Enqueue(tmp);
tmp.RawZero; // queue keeps holding the reference
vedpApproxCount.Increment;
// {$IFDEF Debug} Assert(not vedpDataQueue.IsFull); {$ENDIF} // full queue corrupts data
end; { TOmniValueEnumeratorDataPackage.Add }
function TOmniValueEnumeratorDataPackage.GetNext(var value: TOmniValue): boolean;
var
tmp: TOmniValue;
begin
tmp.RawZero;
Result := vedpDataQueue.TryDequeue(tmp);
if not Result then
Exit;
value := tmp;
tmp._Release; // queue was holding the reference
vedpApproxCount.Decrement;
end; { TOmniValueEnumeratorDataPackage.GetNext }
class function TOmniValueEnumeratorDataPackage.GetPackageSizeLimit: integer;
begin
Result := CMaxValueEnumeratorDataPackageSize;
end; { TOmniValueEnumeratorDataPackage.GetPackageSizeLimit }
function TOmniValueEnumeratorDataPackage.Prepare(dataCount: integer): integer;
begin
// only called when the package is empty
if dataCount <= CMaxValueEnumeratorDataPackageSize then
Result := dataCount
else
Result := CMaxValueEnumeratorDataPackageSize;
vedpApproxCount.Value := 0;
end; { TOmniValueEnumeratorDataPackage.Prepare }
function TOmniValueEnumeratorDataPackage.Split(package: TOmniDataPackage): boolean;
var
intPackage: TOmniValueEnumeratorDataPackage absolute package;
iValue : integer;
value : TOmniValue;
begin
{$IFDEF Debug} Assert(package is TOmniValueEnumeratorDataPackage); {$ENDIF}
Result := false;
for iValue := 1 to intPackage.Prepare(vedpApproxCount.Value div 2) do begin
if not GetNext(value) then
break; //for
intPackage.Add(value);
Result := true;
end;
end; { TOmniValueEnumeratorDataPackage.Split }
{ TOmniValueEnumeratorProvider }
function TOmniValueEnumeratorProvider.Count: int64;
begin
raise Exception.Create('IOmniValueEnumerable cannot be counted');
end; { TOmniValueEnumeratorProvider.Count }
constructor TOmniValueEnumeratorProvider.Create(enumerator: IOmniValueEnumerator);
begin
inherited Create;
vepEnumerator := enumerator;
end; { TOmniValueEnumeratorProvider.Create }
function TOmniValueEnumeratorProvider.CreateDataPackage: TOmniDataPackage;
begin
Result := TOmniValueEnumeratorDataPackage.Create;
end; { TOmniValueEnumeratorProvider.CreateDataPackage }
function TOmniValueEnumeratorProvider.GetCapabilities: TOmniSourceProviderCapabilities;
begin
Result := [spcDataLimit];
end; { TOmniValueEnumeratorProvider.GetCapabilities }
function TOmniValueEnumeratorProvider.GetPackage(dataCount: integer; package:
TOmniDataPackage): boolean;
var
iData : integer;
intPackage: TOmniValueEnumeratorDataPackage absolute package;
timeout : cardinal;
value : TOmniValue;
begin
Assert(not StorePositions);
Result := false;
dataCount := intPackage.Prepare(dataCount);
timeout := INFINITE;
for iData := 1 to dataCount do begin
if not vepEnumerator.TryTake(value, timeout) then
break; //for
intPackage.Add(value);
timeout := 0;
Result := true;
end;
end; { TOmniValueEnumeratorProvider.GetPackage }
function TOmniValueEnumeratorProvider.GetPackageSizeLimit: integer;
begin
Result := TOmniValueEnumeratorDataPackage.GetPackageSizeLimit;
end; { TOmniValueEnumeratorProvider.GetPackageSizeLimit }
{ TOmniEnumeratorProvider }
constructor TOmniEnumeratorProvider.Create(enumerator: IEnumerator);
begin
inherited Create;
epEnumeratorIntf := enumerator;
end; { TOmniEnumeratorProvider.Create }
constructor TOmniEnumeratorProvider.Create(enumerator: TOmniValueEnumerator);
begin
inherited Create;
epEnumeratorObj := enumerator;
end; { TOmniEnumeratorProvider.Create }
function TOmniEnumeratorProvider.Count: int64;
begin
raise Exception.Create('IEnumerable cannot be counted');
end; { TOmniEnumeratorProvider.Count }
function TOmniEnumeratorProvider.CreateDataPackage: TOmniDataPackage;
begin
Result := TOmniValueEnumeratorDataPackage.Create;
end; { TOmniEnumeratorProvider.CreateDataPackage }
function TOmniEnumeratorProvider.GetCapabilities: TOmniSourceProviderCapabilities;
begin
Result := [spcDataLimit];
end; { TOmniEnumeratorProvider.GetCapabilities }
function TOmniEnumeratorProvider.GetPackage(dataCount: integer;
package: TOmniDataPackage): boolean;
var
iData : integer;
intPackage: TOmniValueEnumeratorDataPackage absolute package;
begin
Assert(not StorePositions);
Result := false;
epEnumLock.Acquire;
try
dataCount := intPackage.Prepare(dataCount);
if assigned(epEnumeratorObj) then begin
for iData := 1 to dataCount do begin
if not epEnumeratorObj.MoveNext then
break; //for iData
intPackage.Add(epEnumeratorObj.Current);
Result := true;
end;
end
else begin
for iData := 1 to dataCount do begin
if not epEnumeratorIntf.MoveNext then
break; //for iData
intPackage.Add(epEnumeratorIntf.Current);
Result := true;
end;
end;
finally epEnumLock.Release; end;
end; { TOmniEnumeratorProvider.GetPackage }
function TOmniEnumeratorProvider.GetPackageSizeLimit: integer;
begin
Result := TOmniValueEnumeratorDataPackage.GetPackageSizeLimit;
end; { TOmniEnumeratorProvider.GetPackageSizeLimit }
{ TOmniLocalQueueImpl }
procedure TOmniLocalQueueImpl.AssociateBuffer(buffer: TOmniOutputBuffer);
begin
lqiBufferSet := buffer as TOmniOutputBufferSet;
end; { TOmniLocalQueueImpl.AssociateBuffer }
constructor TOmniLocalQueueImpl.Create(owner: TOmniBaseDataManager);
begin
inherited Create;
lqiDataManager_ref := owner;
lqiDataPackage := lqiDataManager_ref.SourceProvider.CreateDataPackage as TOmniDataPackageBase;
lqiDataPackage.Queue := Self;
end; { TOmniLocalQueueImpl.Create }
destructor TOmniLocalQueueImpl.Destroy;
begin
if assigned(lqiDataManager_ref) then
lqiDataManager_ref.LocalQueueDestroyed(Self);
FreeAndNil(lqiDataPackage); // keep this destruction order! (see Split for more info)
inherited;
end; { TOmniLocalQueueImpl.Destroy }
function TOmniLocalQueueImpl.GetNext(var value: TOmniValue): boolean;
begin
Result := lqiDataPackage.GetNext(value);
if not Result then begin
{$IFDEF Debug}Assert(not assigned(lqiBufferSet));{$ENDIF Debug}
Result := lqiDataManager_ref.GetNext(lqiDataPackage);
if Result then
Result := lqiDataPackage.GetNext(value);
end;
end; { TOmniLocalQueueImpl.GetNext }
function TOmniLocalQueueImpl.GetNext(var position: int64; var value: TOmniValue): boolean;
begin
Result := lqiDataPackage.GetNext(position, value);
if not Result then begin
{$IFDEF Debug}Assert(assigned(lqiBufferSet));{$ENDIF Debug}
lqiBufferSet.ActiveBuffer.MarkFull;
lqiBufferSet.ActivateBuffer; // this will block if alternate buffer is also full
Result := lqiDataManager_ref.GetNext(lqiDataPackage);
if Result then begin
Result := lqiDataPackage.GetNext(position, value);
if Result then
lqiBufferSet.ActiveBuffer.Range := lqiDataPackage.Range;
end;
end;
end; { TOmniLocalQueueImpl.GetNext }
function TOmniLocalQueueImpl.Split(package: TOmniDataPackage): boolean;
begin
// this method is called when queue list is locked, therefore lqiDataPackage is
// guaranteed to still be created
{$IFDEF Debug} Assert(assigned(lqiDataPackage)); {$ENDIF}
Result := lqiDataPackage.Split(package);
end; { TOmniLocalQueueImpl.Split }
{ TOmniOutputBufferImpl }
constructor TOmniOutputBufferImpl.Create(owner: TOmniBaseDataManager;
output: IOmniBlockingCollection; const AShareLock: IOmniCriticalSection);
begin
inherited Create;
obiDataManager_ref := owner;
obiOutput := output;
obiBuffer := TOmniBlockingCollection.Create;
{$IFDEF MSWINDOWS}
obiEmptyEvent := CreateEvent(nil, false, true, nil);
{$ELSE}
obiEmptyEvent := CreateOmniEvent(false, true, AShareLock);
{$ENDIF ~MSWINDOWS}
end; { TOmniOutputBufferImpl.Create }
destructor TOmniOutputBufferImpl.Destroy;
begin
{$IFDEF MSWINDOWS}
DSiCloseHandleAndNull(obiEmptyEvent);
{$ELSE}
obiEmptyEvent := nil;
{$ENDIF ~MSWINDOWS}
FreeAndNil(obiBuffer);
inherited;
end; { TOmniOutputBufferImpl.Destroy }
procedure TOmniOutputBufferImpl.CopyToOutput;
var
value: TOmniValue;
begin
while obiBuffer.TryTake(value) do
obiOutput.Add(value);
SetEvent(obiEmptyEvent);
obiFull := false;
end; { TOmniOutputBufferImpl.CopyToOutput }
procedure TOmniOutputBufferImpl.MarkFull;
begin
obiFull := true;
if obiHasData then
obiDataManager_ref.NotifyBufferFull(Self);
obiHasData := false;
end; { TOmniOutputBufferImpl.MarkFull }
procedure TOmniOutputBufferImpl.SetRange(range: TOmniPositionRange);
begin
obiRange := range;
obiDataManager_ref.NotifyBufferRangeChanged(Self);
obiNextPosition := obiRange.First;
obiHasData := true;
end; { TOmniOutputBufferImpl.SetRange }
procedure TOmniOutputBufferImpl.Submit(position: int64; const data: TOmniValue);
begin
{$IFDEF DEBUG}Assert(position >= obiNextPosition, Format('%d < %d', [position, obiNextPosition])); obiNextPosition := position + 1;{$ENDIF}
obiBuffer.Add(data);
end; { TOmniOutputBufferImpl.Submit }
{ TOmniOutputBufferSet }
constructor TOmniOutputBufferSet.Create(owner: TOmniBaseDataManager;
output: IOmniBlockingCollection);
var
iBuffer: integer;
{$IFNDEF MSWINDOWS}
Events: array of IOmniSynchro;
{$ENDIF ~MSWINDOWS}
begin
obsShareLock := CreateOmniCriticalSection;
{$IFNDEF MSWINDOWS}
SetLength(Events, CNumBuffersInSet);
{$ENDIF}
for iBuffer := 1 to CNumBuffersInSet do begin
obsBuffers[iBuffer] := TOmniOutputBufferImpl.Create(owner, output);
{$IFDEF MSWINDOWS}
obsWaitHandles[iBuffer] := obsBuffers[iBuffer].EmptyEvent;
{$ELSE}
Events[iBuffer-1] := obsBuffers[iBuffer].EmptyEvent;
{$ENDIF ~MSWINDOWS}
end;
{$IFNDEF MSWINDOWS}
obsWaitEvents := TWaitFor.Create(Events, obsShareLock);
{$ENDIF}
ActivateBuffer;
end; { TOmniOutputBufferSet.Create }
destructor TOmniOutputBufferSet.Destroy;
var
iBuffer: integer;
begin
for iBuffer := 1 to CNumBuffersInSet do
obsBuffers[iBuffer].Free;
{$IFNDEF MSWINDOWS}
FreeAndNil(obsWaitEvents);
{$ENDIF ~MSWINDOWS}
inherited;
end; { TOmniOutputBufferSet.Destroy }
procedure TOmniOutputBufferSet.ActivateBuffer;
var
{$IFDEF MSWINDOWS}
awaited: cardinal;
{$ELSE}
Signaller: IOmniSynchro;
iBuffer : integer;
{$ENDIF}
begin
{$IFDEF MSWINDOWS}
awaited := WaitForMultipleObjects(CNumBuffersInSet, @obsWaitHandles, false, INFINITE);
Assert({(awaited >= WAIT_OBJECT_0) and } (awaited < (WAIT_OBJECT_0 + CNumBuffersInSet)));
obsActiveIndex := awaited - WAIT_OBJECT_0 + 1;
obsActiveBuffer_ref := obsBuffers[obsActiveIndex];
{$ELSE}
obsWaitEvents.WaitAny(INFINITE, Signaller);
for iBuffer := 1 to CNumBuffersInSet do begin
if Signaller <> obsBuffers[iBuffer].EmptyEvent then
continue; //for
obsActiveBuffer_ref := obsBuffers[iBuffer];
break; //for
end;
{$ENDIF ~MSWINDOWS}
end; { TOmniOutputBufferSet.ActivateBuffer }
procedure TOmniOutputBufferSet.Submit(position: int64; const data: TOmniValue);
begin
obsActiveBuffer_ref.Submit(position, data);
end; { TOmniOutputBufferSet.Submit }
{ TOmniBaseDataManager }
constructor TOmniBaseDataManager.Create(sourceProvider: TOmniSourceProvider; numWorkers:
integer; options: TOmniDataManagerOptions);
begin
inherited Create;
dmSourceProvider_ref := (sourceProvider as TOmniSourceProviderBase);
dmQueueList := TObjectList.Create;
dmNumWorkers := numWorkers;
dmOptions := options;
dmSourceProvider_ref.StorePositions := (dmoPreserveOrder in dmOptions);
if dmoPreserveOrder in dmOptions then begin
dmBufferRangeList := TGpInt64ObjectList.Create(false);
dmBufferRangeList.Sorted := true;
dmBufferRangeList.Duplicates := dupError;
dmUnusedBuffers := TObjectList.Create;
end;
InitializePacketSizes;
end; { TOmniBaseDataManager.Create }
destructor TOmniBaseDataManager.Destroy;
begin
dmOutputIntf := nil;
FreeAndNil(dmQueueList);
FreeAndNil(dmBufferRangeList);
FreeAndNil(dmUnusedBuffers);
inherited;
end; { TOmniBaseDataManager.Destroy }
function TOmniBaseDataManager.AllocateOutputBuffer: TOmniOutputBuffer;
begin
Assert(assigned(dmOutputIntf));
Result := TOmniOutputBufferSet.Create(Self, dmOutputIntf);
end; { TOmniBaseDataManager.AllocateOutputBuffer }
procedure TOmniBaseDataManager.LocalQueueDestroyed(queue: TOmniLocalQueue);
begin
dmQueueLock.Acquire;
try
dmQueueList.Extract(queue);
finally dmQueueLock.Release; end;
end; { TOmniBaseDataManager.LocalQueueDestroyed }
procedure TOmniBaseDataManager.NotifyBufferFull(buffer: TOmniOutputBufferImpl);
begin
// Remove buffer from the list. Check if next buffer is waiting in the list.
// Copy buffer if it is full and repeat the process.