subscriptiontable.h

Pegasus is an open-source implementationof the DMTF CIM and WBEM standards. It is designed to be por

//%2006////////////////////////////////////////////////////////////////////////
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// Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation, The Open Group.
// Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; Symantec Corporation; The Open Group.
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//==============================================================================
//
// Author: Carol Ann Krug Graves, Hewlett-Packard Company
//             ([e-mail])
//
// Modified By: Aruran, IBM ([e-mail]) for Bug# 3603, 3602
//
//%/////////////////////////////////////////////////////////////////////////////

#ifndef Pegasus_SubscriptionTable_h
#define Pegasus_SubscriptionTable_h

#include <Pegasus/Common/Config.h>
#include <Pegasus/Server/Linkage.h>
#include <Pegasus/Common/CIMInstance.h>
#include <Pegasus/Common/CIMObjectPath.h>
#include <Pegasus/Common/String.h>
#include <Pegasus/Common/Array.h>
#include <Pegasus/Common/HashTable.h>

#include "ProviderClassList.h"
#include "SubscriptionRepository.h"

PEGASUS_NAMESPACE_BEGIN

class IndicationService;

/**
    Entry for ActiveSubscriptions table
 */
struct ActiveSubscriptionsTableEntry
{
    CIMInstance subscription;
    Array <ProviderClassList> providers;
};

/**
    Table for active subscription information

    The ActiveSubscriptions table is used to keep track of active subscriptions.
    This table contains an entry for each subscription that is enabled
    (value of SubscriptionState property is enabled).
    Each entry consists of a Subscription instance, and a list of
    ProviderClassList structs representing the providers, if any, currently
    serving each subscription and the relevant indication subclasses served by
    each provider.
    The Key is the object path of the subscription instance.
    Entries are inserted into the table on initialization, when an enabled
    subscription instance is created, or when a subscription instance is
    modified to be enabled.
    Entries are removed from the table when an enabled subscription instance is
    deleted, or when a subscription instance is modified to be disabled.
    Entries are updated (remove followed by insert) when a provider serving a
    subscription is disabled or enabled, or a provider registration change
    occurs.
    The _handleProcessIndicationRequest() function, when a list of
    subscriptions is included in request, looks up each subscription in the
    table.
    The _handleNotifyProviderRegistrationRequest() function, once matching
    subscriptions have been identified, looks up the provider information for
    each matching subscription in the table.
    The _handleModifyInstanceRequest() and _handleDeleteInstanceRequest()
    functions, when sending delete requests to providers, look up the providers
    for the subscription in the table.
    The _handleNotifyProviderTerminationRequest() function, when a provider is
    disabled, iterates through the table to retrieve all active
    subscriptions being served by the provider.
    The terminate() function, when the CIM Server is being shut down, iterates
    through the table to retrieve all active subscriptions.
 */
typedef HashTable <CIMObjectPath,
                   ActiveSubscriptionsTableEntry,
                   EqualFunc <CIMObjectPath>,
                   HashFunc <CIMObjectPath> > ActiveSubscriptionsTable;

/**
    Entry for SubscriptionClasses table
 */
struct SubscriptionClassesTableEntry
{
    CIMName indicationClassName;
    CIMNamespaceName sourceNamespaceName;
    Array <CIMInstance> subscriptions;
};

/**
    Table for subscription classes information

    The SubscriptionClasses Table is used to keep track of active subscriptions
    for each indication subclass-source namespace pair.
    Each entry consists of an indication subclass name, a source namespace name,
    and a list of subscription instances.
    The Key is generated by concatenating the indication subclass name, and the
    source namespace name.
    The _handleProcessIndicationRequest() function, when no list of
    subscriptions is included in the request, looks up matching subscriptions
    in the table, using the class name and namespace name of the indication
    instance.
    The _handleNotifyProviderRegistrationRequest() function, when an indication
    provider registration instance has been created or deleted, looks up
    matching subscriptions in the table, using the class name and namespace
    names from the provider registration instance.
 */
typedef HashTable <String,
                   SubscriptionClassesTableEntry,
                   EqualNoCaseFunc,
                   HashLowerCaseFunc> SubscriptionClassesTable;

/**

    The SubscriptionTable class manages an in-memory cache of indication
    subscription information in two hash tables.  The Active Subscriptions
    table includes all enabled subscriptions along with the providers currently
    serving them.  The Subscription Classes table includes the enabled
    subscription instances for each indication class/namespace pair, based on
    the filter query and sourceNamespace.

    @author  Hewlett-Packard Company

 */

class PEGASUS_SERVER_LINKAGE SubscriptionTable
{
public:

    /**
        Constructs a SubscriptionTable instance.
     */
    SubscriptionTable (
        SubscriptionRepository * subscriptionRepository);

    /**
        Destructs a SubscriptionTable instance.
     */
    ~SubscriptionTable ();

    /**
        Inserts entries (or updates existing entries) for the specified
        subscription in the Active Subscriptions and Subscription Classes
        tables.

        @param   subscription            the subscription instance
        @param   providers               the list of providers
        @param   indicationSubclassNames the list of indication subclass names
        @param   sourceNamespaceName     the source namespace name
     */
    void insertSubscription (
        const CIMInstance & subscription,
        const Array <ProviderClassList> & providers,
        const Array <CIMName> & indicationSubclassNames,
        const CIMNamespaceName & sourceNamespaceName);

    /**
        Updates an entry in the Active Subscriptions table to either add a
        provider to or remove a provider from the list of providers serving the
        subscription.

        @param   subscriptionPath        the subscription object path
        @param   provider                the provider to be added or removed
        @param   addProvider             indicates if adding or removing
                                         provider
     */
    void updateProviders (
        const CIMObjectPath & subscriptionPath,
        const ProviderClassList & provider,
        Boolean addProvider);

    /**
        Updates an entry in the Active Subscriptions table to either add a
        class to or remove a class from the list of indication subclasses served
        by a provider serving the subscription.

        @param   subscriptionPath        the subscription object path
        @param   provider                the provider
        @param   className               the class to be added or removed
     */
    void updateClasses (
        const CIMObjectPath & subscriptionPath,
        const CIMInstance & provider,
        const CIMName & className);

    /**
        Removes entries (or updates entries) for the specified subscription in
        the Active Subscriptions and Subscription Classes tables.

        @param   subscription            the subscription instance
        @param   indicationSubclassNames the list of indication subclass names
        @param   sourceNamespaceName     the source namespace name
        @param   providers               the list of providers that had been
                                         serving the subscription
     */
    void removeSubscription (
        const CIMInstance & subscription,
        const Array <CIMName> & indicationSubclassNames,
        const CIMNamespaceName & sourceNamespaceName,
        const Array <ProviderClassList> & providers);

    /**
        Retrieves the Active Subscriptions table entry for the specified
        subscription.  If this function returns False, the value of tableValue
        is not changed.

        @param   subscriptionPath      the object path of the subscription
        @param   tableValue            the retrieved table entry

        @return   True, if the specified subscription table entry was found;
                  False otherwise
     */
    Boolean getSubscriptionEntry (
        const CIMObjectPath & subscriptionPath,
        ActiveSubscriptionsTableEntry & tableValue) const;

    /**
        Retrieves list of enabled subscription instances in the specified
        namespaces, where the subscription indication class matches or is a
        superclass of the supported class.  If the checkProvider parameter
        value is True, a subscription is only included in the list returned if
        the specified provider accepted the subscription.  If the checkProvider
        parameter value is False, the provider parameter is not used (ignored).

        @param   supportedClass       the supported class
        @param   nameSpaces           the list of supported namespaces
        @param   checkProvider        indicates whether provider acceptance is
                                          checked
        @param   provider             the provider (used if checkProvider True)

        @return   list of CIMInstance subscriptions