TAO_Policies Class Reference

This class ensures that policies submitted to Lookup make sense, have the correct value types, and don't exceed the maximums set through the Admin Interface. More...

#include <Trader_Utils.h>

Collaboration diagram for TAO_Policies:

[legend]List of all members.

Public Types
	STARTING_TRADER
	EXACT_TYPE_MATCH
	HOP_COUNT
	LINK_FOLLOW_RULE
	MATCH_CARD
	RETURN_CARD
	SEARCH_CARD
	USE_DYNAMIC_PROPERTIES
	USE_MODIFIABLE_PROPERTIES
	USE_PROXY_OFFERS
	REQUEST_ID
enum	POLICY_TYPE {   STARTING_TRADER, EXACT_TYPE_MATCH, HOP_COUNT, LINK_FOLLOW_RULE,   MATCH_CARD, RETURN_CARD, SEARCH_CARD, USE_DYNAMIC_PROPERTIES,   USE_MODIFIABLE_PROPERTIES, USE_PROXY_OFFERS, REQUEST_ID }
Public Member Functions
	TAO_Policies (TAO_Trader_Base &trader, const CosTrading::PolicySeq &policies) throw (CosTrading::Lookup::IllegalPolicyName, CosTrading::DuplicatePolicyName)
	~TAO_Policies (void)
CORBA::ULong	search_card () const throw (CosTrading::Lookup::PolicyTypeMismatch)
CORBA::ULong	match_card () const throw (CosTrading::Lookup::PolicyTypeMismatch)
CORBA::ULong	return_card () const throw (CosTrading::Lookup::PolicyTypeMismatch)
CORBA::Boolean	use_modifiable_properties () const throw (CosTrading::Lookup::PolicyTypeMismatch)
CORBA::Boolean	use_dynamic_properties () const throw (CosTrading::Lookup::PolicyTypeMismatch)
CORBA::Boolean	use_proxy_offers () const throw (CosTrading::Lookup::PolicyTypeMismatch)
CORBA::Boolean	exact_type_match () const throw (CosTrading::Lookup::PolicyTypeMismatch)
CosTrading::TraderName *	starting_trader () const throw (CosTrading::Lookup::PolicyTypeMismatch, CosTrading::Lookup::InvalidPolicyValue)
CosTrading::FollowOption	link_follow_rule () const throw (CosTrading::Lookup::PolicyTypeMismatch)
	Determine the link follow policy for this query overall.
CosTrading::FollowOption	link_follow_rule (const CosTrading::Link::LinkInfo &link_info) const throw (CosTrading::Lookup::PolicyTypeMismatch, CosTrading::Lookup::InvalidPolicyValue, CosTrading::Link::IllegalLinkName, CosTrading::Link::UnknownLinkName)
CORBA::ULong	hop_count () const throw (CosTrading::Lookup::PolicyTypeMismatch)
CosTrading::Admin::OctetSeq *	request_id () const throw (CosTrading::Lookup::PolicyTypeMismatch)
void	copy_to_pass (CosTrading::PolicySeq &policy_seq, const CosTrading::Admin::OctetSeq &request_id) const
	Policies to forward to the next trader in a federated query.
void	copy_to_forward (CosTrading::PolicySeq &policy_seq, const CosTrading::TraderName &name) const
	Policies to forward to the next trader in a directed query.
void	copy_in_follow_option (CosTrading::PolicySeq &policy_seq, const CosTrading::Link::LinkInfo &link_info) const throw (CosTrading::Lookup::PolicyTypeMismatch, CosTrading::Lookup::InvalidPolicyValue)
Static Public Attributes
static const char *	POLICY_NAMES []
Private Member Functions
CORBA::ULong	ulong_prop (POLICY_TYPE pol) const throw (CosTrading::Lookup::PolicyTypeMismatch)
	Reconclile a ULong property with its default.
CORBA::Boolean	boolean_prop (POLICY_TYPE pol) const throw (CosTrading::Lookup::PolicyTypeMismatch)
	Reconcile a Boolean property with its debault.
	TAO_Policies (const TAO_Policies &)
TAO_Policies &	operator= (const TAO_Policies &)
Private Attributes
CosTrading::Policy *	policies_ [TAO_NUM_POLICIES]
	The policies indexable from the enumerated type.
TAO_Trader_Base &	trader_
	For the validating identifier names.

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Detailed Description

This class ensures that policies submitted to Lookup make sense, have the correct value types, and don't exceed the maximums set through the Admin Interface.

TAO_Policies does an admirable job of reconciling differences between the default parameter settings of the Trader and the import and other policies set by the client. Unbeknownst to its client TAO_Policies hides this arbitration, and records whether the user policy was chosen, or the default. This information gets returned to the invoker of the query method.

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Member Enumeration Documentation

enum TAO_Policies::POLICY_TYPE

This enum represents the relative order that properties are passed from one trader to another. Hence, as recommended by the spec, the starting_trader policies will be the first element in the polcy sequence if it's set for a query.

Enumerator:

STARTING_TRADER
EXACT_TYPE_MATCH
HOP_COUNT
LINK_FOLLOW_RULE
MATCH_CARD
RETURN_CARD
SEARCH_CARD
USE_DYNAMIC_PROPERTIES
USE_MODIFIABLE_PROPERTIES
USE_PROXY_OFFERS
REQUEST_ID

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Constructor & Destructor Documentation

TAO_Policies::TAO_Policies	(	TAO_Trader_Base &	trader,
		const CosTrading::PolicySeq &	policies
	)			throw (CosTrading::Lookup::IllegalPolicyName, CosTrading::DuplicatePolicyName)

TAO_Policies::~TAO_Policies

(

void

)

TAO_Policies::TAO_Policies

(

const TAO_Policies &

)

[private]

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Member Function Documentation

CORBA::Boolean TAO_Policies::boolean_prop

(

POLICY_TYPE

pol

)

const throw (CosTrading::Lookup::PolicyTypeMismatch) [private]

Reconcile a Boolean property with its debault.

void TAO_Policies::copy_in_follow_option	(	CosTrading::PolicySeq &	policy_seq,
		const CosTrading::Link::LinkInfo &	link_info
	)			const throw (CosTrading::Lookup::PolicyTypeMismatch, CosTrading::Lookup::InvalidPolicyValue)

Determine the link follow policy to pass down the link with <link_name>. This method returns the link_follow_rule for a link whose name is <link_name> using the following formula: If the importer specified a link_follow_rule, policy pass on min(query.link_follow_rule, link.limiting_follow_rule, trader.max_follow_policy) else pass on min(link.def_pass_on_follow_rule, trader.max_follow_policy)

void TAO_Policies::copy_to_forward	(	CosTrading::PolicySeq &	policy_seq,
		const CosTrading::TraderName &	name
	)			const

Policies to forward to the next trader in a directed query.

void TAO_Policies::copy_to_pass	(	CosTrading::PolicySeq &	policy_seq,
		const CosTrading::Admin::OctetSeq &	request_id
	)			const

Policies to forward to the next trader in a federated query.

CORBA::Boolean TAO_Policies::exact_type_match

(

)

const throw (CosTrading::Lookup::PolicyTypeMismatch)

CORBA::ULong TAO_Policies::hop_count

(

)

const throw (CosTrading::Lookup::PolicyTypeMismatch)

CosTrading::FollowOption TAO_Policies::link_follow_rule

(

const CosTrading::Link::LinkInfo &

link_info

)

const throw (CosTrading::Lookup::PolicyTypeMismatch, CosTrading::Lookup::InvalidPolicyValue, CosTrading::Link::IllegalLinkName, CosTrading::Link::UnknownLinkName)

Determine the link follow policy for a given <link_name>. This method returns the link_follow_rule for a link whose name is <link_name> using the following formula: if the importer specified a link_follow_rule policy min(trader.max_follow_policy, link.limiting_follow_rule, query.link_follow_rule) else min(trader.max_follow_policy, link.limiting_follow_rule, trader.def_follow_policy)

CosTrading::FollowOption TAO_Policies::link_follow_rule

(

)

const throw (CosTrading::Lookup::PolicyTypeMismatch)

Determine the link follow policy for this query overall.

CORBA::ULong TAO_Policies::match_card

(

)

const throw (CosTrading::Lookup::PolicyTypeMismatch)

TAO_Policies& TAO_Policies::operator=

(

const TAO_Policies &

)

[private]

CosTrading::Admin::OctetSeq * TAO_Policies::request_id

(

)

const throw (CosTrading::Lookup::PolicyTypeMismatch)

Return the request_id passed to the query method across a link to another trader.

CORBA::ULong TAO_Policies::return_card

(

)

const throw (CosTrading::Lookup::PolicyTypeMismatch)

CORBA::ULong TAO_Policies::search_card

(

)

const throw (CosTrading::Lookup::PolicyTypeMismatch)

CosTrading::TraderName * TAO_Policies::starting_trader

(

)

const throw (CosTrading::Lookup::PolicyTypeMismatch, CosTrading::Lookup::InvalidPolicyValue)

BEGIN SPEC The "starting_trader" policy facilitates the distribution of the trading service itself. It allows an importer to scope a search by choosing to explicitly navigate the links of the trading graph. If the policy is used in a query invocation it is recommended that it be the first policy-value pair; this facilitates an optimal forwarding of the query operation. A "policies" parameter need not include a value for the "starting_trader" policy. Where this policy is present, the first name component is compared against the name held in each link. If no match is found, the InvalidPolicyValue exception is raised. Otherwise, the trader invokes query() on the Lookup interface held by the named link, but passing the "starting_trader" policy with the first component removed. END SPEC

CORBA::ULong TAO_Policies::ulong_prop

(

POLICY_TYPE

pol

)

const throw (CosTrading::Lookup::PolicyTypeMismatch) [private]

Reconclile a ULong property with its default.

CORBA::Boolean TAO_Policies::use_dynamic_properties

(

)

const throw (CosTrading::Lookup::PolicyTypeMismatch)

CORBA::Boolean TAO_Policies::use_modifiable_properties

(

)

const throw (CosTrading::Lookup::PolicyTypeMismatch)

CORBA::Boolean TAO_Policies::use_proxy_offers

(

)

const throw (CosTrading::Lookup::PolicyTypeMismatch)

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Member Data Documentation

CosTrading::Policy* TAO_Policies::policies_[TAO_NUM_POLICIES] [private]

The policies indexable from the enumerated type.

const char * TAO_Policies::POLICY_NAMES [static]

Initial value:

{
  "starting_trader",
  "exact_type_match",
  "hop_count",
  "link_follow_rule",
  "match_card",
  "return_card",
  "search_card",
  "use_dynamic_properties",
  "use_modifiable_properties",
  "use_proxy_offers",
  "request_id"
}

TAO_Trader_Base& TAO_Policies::trader_ [private]

For the validating identifier names.

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

• Trader_Utils.h
• Trader_Utils.cpp

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