org.apache.directory.server.dhcp.store

Class AbstractDhcpStore

java.lang.Object

org.apache.directory.server.dhcp.store.AbstractDhcpStore

All Implemented Interfaces:

DhcpStore

Direct Known Subclasses:

SimpleDhcpStore

public abstract class AbstractDhcpStore
extends Object
implements DhcpStore

Abstract base implementation of a DhcpStore.

Author:

Apache Directory Project

Constructor Summary

Constructors

Constructor and Description
AbstractDhcpStore()

Method Summary

Modifier and Type	Method and Description
protected abstract Host	findDesignatedHost(HardwareAddress hardwareAddress) Find a host to with the explicitely designated hardware address.
protected abstract Lease	findExistingLease(HardwareAddress hardwareAddress, Lease existingLease) Find an existing lease in the store.
protected abstract Subnet	findSubnet(InetAddress clientAddress) Find the subnet definition matching the given address.
Lease	getExistingLease(HardwareAddress hardwareAddress, InetAddress requestedAddress, InetAddress selectionBase, long requestedLeaseTime, OptionsField options) Retrieve an existing lease from the dhcp store.
Lease	getLeaseOffer(HardwareAddress hardwareAddress, InetAddress requestedAddress, InetAddress selectionBase, long requestedLeaseTime, OptionsField options) Find a lease to offer in response to a DHCPDISCOVER request.
protected abstract OptionsField	getOptions(DhcpConfigElement element) Return a list of all options applicable to the given config element.
protected abstract Map	getProperties(DhcpConfigElement element) Return a list of all options applicable to the given config element.
void	releaseLease(Lease lease) Release the specified lease.
protected abstract void	updateLease(Lease lease) Update the (possibly changed) lease in the store.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractDhcpStore

public AbstractDhcpStore()

Method Detail

getLeaseOffer

public Lease getLeaseOffer(HardwareAddress hardwareAddress,
                           InetAddress requestedAddress,
                           InetAddress selectionBase,
                           long requestedLeaseTime,
                           OptionsField options)
                    throws DhcpException

Description copied from interface: DhcpStore

Find a lease to offer in response to a DHCPDISCOVER request.

The lease to offer should be determined by an algorithme like the following:

• Try to find an existing lease for the given hardware address. The lease may be either ACTIVE or EXPIRED.
• Try to find a lease which has been explicitely dedicated to the given hardware address.
• Try to get a lease from a pool of leases. If the client requested a specific address, the request should be honored, if possible. Otherwise the selection of an address should be based on the selection base address and may be refined using the supplied options.

If the requestedLeaseTime is >= 0, the validity duration of the returned lease must be updated, so that the lease is valid for at least the specified time. The duration may, however, be constrained by a configured maximum lease time.

Specified by:

getLeaseOffer in interface DhcpStore

Parameters:

hardwareAddress - hardwareAddress the hardware address of the client requesting the lease.

requestedAddress - the address requested by the client or null if the client did not request a specific address.

selectionBase - the address on which to base the selection of a lease from a pool, i.e. either the address of the interface on which the request was received or the address of a DHCP relay agent.

requestedLeaseTime - the lease time in milliseconds as requested by the client, or -1 if the client did not request a specific lease time.

options - the supplied DHCP options. Lease selection may be refined by using those options

Returns:

a lease or null if no matching lease was found.

Throws:

DhcpException

getExistingLease

public Lease getExistingLease(HardwareAddress hardwareAddress,
                              InetAddress requestedAddress,
                              InetAddress selectionBase,
                              long requestedLeaseTime,
                              OptionsField options)
                       throws DhcpException

Description copied from interface: DhcpStore

Retrieve an existing lease from the dhcp store.

Specified by:

getExistingLease in interface DhcpStore

Returns:

Lease

Throws:

DhcpException

releaseLease

public void releaseLease(Lease lease)

Description copied from interface: DhcpStore

Release the specified lease.

Specified by:

releaseLease in interface DhcpStore

updateLease

protected abstract void updateLease(Lease lease)

Update the (possibly changed) lease in the store.

Parameters:

lease -

getOptions

protected abstract OptionsField getOptions(DhcpConfigElement element)

Return a list of all options applicable to the given config element. List list must contain the options specified for the element and all parent elements in an aggregated fashion. For instance, the options for a host must include the global default options, the options of classes the host is a member of, the host's group options and the host's options.

Parameters:

element -

Returns:

OptionsField

getProperties

protected abstract Map getProperties(DhcpConfigElement element)

Return a list of all options applicable to the given config element. List list must contain the options specified for the element and all parent elements in an aggregated fashion. For instance, the options for a host must include the global default options, the options of classes the host is a member of, the host's group options and the host's options.

Parameters:

element -

Returns:

Map

findExistingLease

protected abstract Lease findExistingLease(HardwareAddress hardwareAddress,
                                           Lease existingLease)

Find an existing lease in the store.

Parameters:

hardwareAddress -

existingLease -

Returns:

Map

findDesignatedHost

protected abstract Host findDesignatedHost(HardwareAddress hardwareAddress)
                                    throws DhcpException

Find a host to with the explicitely designated hardware address.

Parameters:

hardwareAddress -

Returns:

Host

Throws:

DhcpException

findSubnet

protected abstract Subnet findSubnet(InetAddress clientAddress)

Find the subnet definition matching the given address.

Parameters:

clientAddress -

Returns:

Subnet