isc::dhcp::ResourceHandler Class Reference

Resource race avoidance RAII handler. More...

#include <resource_handler.h>

Inheritance diagram for isc::dhcp::ResourceHandler:

Public Member Functions
	ResourceHandler ()
	Constructor.
virtual	~ResourceHandler ()
	Destructor.
bool	isLocked (Lease::Type type, const asiolink::IOAddress &addr)
	Checks if a resource is owned by this handler.
bool	tryLock (Lease::Type type, const asiolink::IOAddress &addr)
	Tries to acquires a resource.
void	unLock (Lease::Type type, const asiolink::IOAddress &addr)
	Releases a resource.

Detailed Description

Resource race avoidance RAII handler.

Definition at line 34 of file resource_handler.h.

Constructor & Destructor Documentation

ResourceHandler()

isc::dhcp::ResourceHandler::ResourceHandler

(

)

Constructor.

Definition at line 23 of file resource_handler.cc.

~ResourceHandler()

isc::dhcp::ResourceHandler::~ResourceHandler ( )

virtual

Destructor.

Releases owned resources.

Definition at line 26 of file resource_handler.cc.

Member Function Documentation

isLocked()

bool isc::dhcp::ResourceHandler::isLocked	(	Lease::Type	type,
		const asiolink::IOAddress &	addr )

Checks if a resource is owned by this handler.

Parameters

type	Type of the resource, member of Lease::Type enum.
addr	The address or prefix aka the resource.

Returns

true if this handler owns the resource, false otherwise.

Definition at line 77 of file resource_handler.cc.

References isc::asiolink::IOAddress::toBytes().

Referenced by isc::dhcp::ResourceHandler4::isLocked4().

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tryLock()

bool isc::dhcp::ResourceHandler::tryLock	(	Lease::Type	type,
		const asiolink::IOAddress &	addr )

Tries to acquires a resource.

Lookup the resource, if not found insert the resource in the resource container and return true, if found return false

Parameters

type	Type of the resource, member of Lease::Type enum.
addr	The address or prefix aka the resource.

Returns

true if the resource was acquired, false if the resource is busy i.e. owned by a handler.

Definition at line 64 of file resource_handler.cc.

Referenced by isc::lease_cmds::LeaseCmdsImpl::lease6BulkApplyHandler(), isc::lease_cmds::LeaseCmdsImpl::lease6UpdateHandler(), isc::lease_cmds::LeaseCmdsImpl::leaseAddHandler(), and isc::dhcp::ResourceHandler4::tryLock4().

unLock()

void isc::dhcp::ResourceHandler::unLock	(	Lease::Type	type,
		const asiolink::IOAddress &	addr )

Releases a resource.

Remove the resource from the resource container.

Parameters

type	Type of the resource, member of Lease::Type enum.
addr	The address or prefix aka the resource.

Exceptions

when	we do not own the resource.

Definition at line 85 of file resource_handler.cc.

References isc_throw, isc::asiolink::IOAddress::toBytes(), isc::asiolink::IOAddress::toText(), and isc::dhcp::Lease::typeToText().

Referenced by isc::dhcp::ResourceHandler4::unLock4().

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

• resource_handler.h
• resource_handler.cc