PlusAnonymousConcurrentUserDataModel Class

NReco.Recommender Class Library

This is a special thread-safe version of PlusAnonymousUserDataModel which allow multiple concurrent anonymous requests.

To use it, you have to estimate the number of concurrent anonymous users of your application. The pool of users with the given size will be created. For each anonymous recommendations request, a user has to be taken from the pool and returned back immediately afterwards.

If no more users are available in the pool, anonymous recommendations cannot be produced.

Inheritance Hierarchy

System Object
NReco.CF.Taste.Impl.Model PlusAnonymousUserDataModel
NReco.CF.Taste.Impl.Model PlusAnonymousConcurrentUserDataModel

Namespace: NReco.CF.Taste.Impl.Model
Assembly: NReco.Recommender (in NReco.Recommender.dll) Version: 1.0.0.0 (1.0.0.0)

Syntax

C++

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public sealed class PlusAnonymousConcurrentUserDataModel : PlusAnonymousUserDataModel

public sealed class PlusAnonymousConcurrentUserDataModel : PlusAnonymousUserDataModel

Public NotInheritable Class PlusAnonymousConcurrentUserDataModel 
	Inherits PlusAnonymousUserDataModel

Public NotInheritable Class PlusAnonymousConcurrentUserDataModel 
	Inherits PlusAnonymousUserDataModel

public ref class PlusAnonymousConcurrentUserDataModel sealed : public PlusAnonymousUserDataModel

public ref class PlusAnonymousConcurrentUserDataModel sealed : public PlusAnonymousUserDataModel

[<SealedAttribute>]
type PlusAnonymousConcurrentUserDataModel =  
    class 
        inherit PlusAnonymousUserDataModel 
    end

[<SealedAttribute>]
type PlusAnonymousConcurrentUserDataModel =  
    class 
        inherit PlusAnonymousUserDataModel 
    end

The PlusAnonymousConcurrentUserDataModel type exposes the following members.

Constructors

	Name	Description
	PlusAnonymousConcurrentUserDataModel	Initializes a new instance of the PlusAnonymousConcurrentUserDataModel class

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Methods

	Name	Description
	clearTempPrefs	(Inherited from PlusAnonymousUserDataModel.)
	ClearTempPrefs
	Equals	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetItemIDs	(Inherited from PlusAnonymousUserDataModel.)
	GetItemIDsFromUser	(Overrides PlusAnonymousUserDataModel GetItemIDsFromUser(Int64).)
	GetMaxPreference	(Inherited from PlusAnonymousUserDataModel.)
	GetMinPreference	(Inherited from PlusAnonymousUserDataModel.)
	GetNumItems	(Inherited from PlusAnonymousUserDataModel.)
	GetNumUsers	(Overrides PlusAnonymousUserDataModel GetNumUsers .)
	GetNumUsersWithPreferenceFor(Int64)	(Overrides PlusAnonymousUserDataModel GetNumUsersWithPreferenceFor(Int64).)
	GetNumUsersWithPreferenceFor(Int64, Int64)	(Overrides PlusAnonymousUserDataModel GetNumUsersWithPreferenceFor(Int64, Int64).)
	GetPreferencesForItem	(Overrides PlusAnonymousUserDataModel GetPreferencesForItem(Int64).)
	GetPreferencesFromUser	(Overrides PlusAnonymousUserDataModel GetPreferencesFromUser(Int64).)
	GetPreferenceTime	(Overrides PlusAnonymousUserDataModel GetPreferenceTime(Int64, Int64).)
	GetPreferenceValue	(Overrides PlusAnonymousUserDataModel GetPreferenceValue(Int64, Int64).)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetUserIDs	(Overrides PlusAnonymousUserDataModel GetUserIDs .)
	HasPreferenceValues	(Inherited from PlusAnonymousUserDataModel.)
	Refresh	(Inherited from PlusAnonymousUserDataModel.)
	ReleaseUser
	RemovePreference	(Overrides PlusAnonymousUserDataModel RemovePreference(Int64, Int64).)
	SetPreference	(Overrides PlusAnonymousUserDataModel SetPreference(Int64, Int64, Single).)
	SetTempPrefs(IPreferenceArray)	(Inherited from PlusAnonymousUserDataModel.)
	SetTempPrefs(IPreferenceArray, Int64)
	TakeAvailableUser
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Examples

Setup:

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int concurrentUsers = 100;
IDataModel realModel = ..
PlusAnonymousConcurrentUserDataModel plusModel =
  new PlusAnonymousConcurrentUserDataModel(realModel, concurrentUsers);
IRecommender recommender = ...;

int concurrentUsers = 100;
IDataModel realModel = ..
PlusAnonymousConcurrentUserDataModel plusModel =
  new PlusAnonymousConcurrentUserDataModel(realModel, concurrentUsers);
IRecommender recommender = ...;

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PlusAnonymousConcurrentUserDataModel plusModel =
  (PlusAnonymousConcurrentUserDataModel) recommender.GetDataModel();

// Take the next available anonymous user from the pool 
long anonymousUserID = plusModel.TakeAvailableUser();

IPreferenceArray tempPrefs = ..
tempPrefs.SetUserID(0, anonymousUserID);
tempPrefs.SetItemID(0, itemID);
plusModel.SetTempPrefs(tempPrefs, anonymousUserID);

// Produce recommendations
recommender.Recommend(anonymousUserID, howMany);

// It is very IMPORTANT to release user back to the pool
plusModel.ReleaseUser(anonymousUserID);

PlusAnonymousConcurrentUserDataModel plusModel =
  (PlusAnonymousConcurrentUserDataModel) recommender.GetDataModel();

// Take the next available anonymous user from the pool 
long anonymousUserID = plusModel.TakeAvailableUser();

IPreferenceArray tempPrefs = ..
tempPrefs.SetUserID(0, anonymousUserID);
tempPrefs.SetItemID(0, itemID);
plusModel.SetTempPrefs(tempPrefs, anonymousUserID);

// Produce recommendations
recommender.Recommend(anonymousUserID, howMany);

// It is very IMPORTANT to release user back to the pool
plusModel.ReleaseUser(anonymousUserID);

Real-time recommendation: