Haizea

# -------------------------------------------------------------------------- #

# Copyright 2006-2009, University of Chicago                                 #

# Copyright 2008-2009, Distributed Systems Architecture Group, Universidad   #

# Complutense de Madrid (dsa-research.org)                                   #

#                                                                            #

# Licensed under the Apache License, Version 2.0 (the "License"); you may    #

# not use this file except in compliance with the License. You may obtain    #

# a copy of the License at                                                   #

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# http://www.apache.org/licenses/LICENSE-2.0                                 #

#                                                                            #

# Unless required by applicable law or agreed to in writing, software        #

# distributed under the License is distributed on an "AS IS" BASIS,          #

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #

# See the License for the specific language governing permissions and        #

# limitations under the License.                                             #

# -------------------------------------------------------------------------- #

import haizea.common.constants as constants

from haizea.core.scheduler.preparation_schedulers import PreparationScheduler

from haizea.core.scheduler.slottable import ResourceReservation

from haizea.core.scheduler import MigrationResourceReservation, InconsistentLeaseStateError

from haizea.core.leases import Lease, Capacity, UnmanagedSoftwareEnvironment

from haizea.core.scheduler import ReservationEventHandler, NotSchedulableException, EarliestStartingTime

from haizea.common.utils import estimate_transfer_time, get_config

from mx.DateTime import TimeDelta

import bisect

import logging

class ImageTransferPreparationScheduler(PreparationScheduler):

    def __init__(self, slottable, resourcepool, deployment_enact):

        PreparationScheduler.__init__(self, slottable, resourcepool, deployment_enact)

        self.imagenode = self.deployment_enact.get_imagenode()

        self.transfers = []

        self.completed_transfers = []

        self.imagenode_bandwidth = self.deployment_enact.get_bandwidth()

        self.handlers ={}

        self.handlers[FileTransferResourceReservation] = ReservationEventHandler(

                                sched    = self,

                                on_start = ImageTransferPreparationScheduler._handle_start_filetransfer,

                                on_end   = ImageTransferPreparationScheduler._handle_end_filetransfer)

        self.handlers[DiskImageMigrationResourceReservation] = ReservationEventHandler(

                                sched    = self,

                                on_start = ImageTransferPreparationScheduler._handle_start_migrate,

                                on_end   = ImageTransferPreparationScheduler._handle_end_migrate)

    def schedule(self, lease, vmrr, earliest, nexttime):

        if type(lease.software) == UnmanagedSoftwareEnvironment:

            return [], True

        if lease.get_type() == Lease.ADVANCE_RESERVATION:

            return self.__schedule_deadline(lease, vmrr, earliest, nexttime)

        elif lease.get_type() in (Lease.BEST_EFFORT, Lease.IMMEDIATE):

            return self.__schedule_asap(lease, vmrr, earliest, nexttime)

    def schedule_migration(self, lease, vmrr, nexttime):

        if type(lease.software) == UnmanagedSoftwareEnvironment:

            return []

        # This code is the same as the one in vm_scheduler

        # Should be factored out

        last_vmrr = lease.get_last_vmrr()

        vnode_migrations = dict([(vnode, (last_vmrr.nodes[vnode], vmrr.nodes[vnode])) for vnode in vmrr.nodes])

        mustmigrate = False

        for vnode in vnode_migrations:

            if vnode_migrations[vnode][0] != vnode_migrations[vnode][1]:

                mustmigrate = True

                break

        if not mustmigrate:

            return []

        if get_config().get("migration") == constants.MIGRATE_YES_NOTRANSFER:

            start = nexttime

            end = nexttime

            res = {}

            migr_rr = DiskImageMigrationResourceReservation(lease, start, end, res, vmrr, vnode_migrations)

            migr_rr.state = ResourceReservation.STATE_SCHEDULED

            return [migr_rr]

        # Figure out what migrations can be done simultaneously

        migrations = []

        while len(vnode_migrations) > 0:

            pnodes = set()

            migration = {}

            for vnode in vnode_migrations:

                origin = vnode_migrations[vnode][0]

                dest = vnode_migrations[vnode][1]

                if not origin in pnodes and not dest in pnodes:

                    migration[vnode] = vnode_migrations[vnode]

                    pnodes.add(origin)

                    pnodes.add(dest)

            for vnode in migration:

                del vnode_migrations[vnode]

            migrations.append(migration)

        # Create migration RRs

        start = max(last_vmrr.post_rrs[-1].end, nexttime)

        bandwidth = self.resourcepool.info.get_migration_bandwidth()

        migr_rrs = []

        for m in migrations:

            mb_per_physnode = {}

            for vnode, (pnode_from, pnode_to) in m.items():

                mb_per_physnode[pnode_from] = mb_per_physnode.setdefault(pnode_from, 0) + lease.software.image_size

            max_mb_to_migrate = max(mb_per_physnode.values())

            migr_time = estimate_transfer_time(max_mb_to_migrate, bandwidth)

            end = start + migr_time

            res = {}

            for (origin,dest) in m.values():

                resorigin = Capacity([constants.RES_NETOUT])

                resorigin.set_quantity(constants.RES_NETOUT, bandwidth)

                resdest = Capacity([constants.RES_NETIN])

                resdest.set_quantity(constants.RES_NETIN, bandwidth)

                res[origin] = self.slottable.create_resource_tuple_from_capacity(resorigin)

                res[dest] = self.slottable.create_resource_tuple_from_capacity(resdest)                

            migr_rr = DiskImageMigrationResourceReservation(lease, start, start + migr_time, res, vmrr, m)

            migr_rr.state = ResourceReservation.STATE_SCHEDULED

            migr_rrs.append(migr_rr)

            start = end

        return migr_rrs

    def estimate_migration_time(self, lease):

        migration = get_config().get("migration")

        if migration == constants.MIGRATE_YES:

            bandwidth = self.resourcepool.info.get_migration_bandwidth()

            vmrr = lease.get_last_vmrr()

            #images_in_pnode = dict([(pnode,0) for pnode in set(vmrr.nodes.values())])

            transfer_time = estimate_transfer_time(lease.software.image_size, bandwidth) * len (vmrr.nodes)

            #for (vnode,pnode) in vmrr.nodes.items():

            #    images_in_pnode[pnode] += lease.software.image_size

            #max_to_transfer = max(images_in_pnode.values()) * 2 # Kludge

            return transfer_time

        elif migration == constants.MIGRATE_YES_NOTRANSFER:

            return TimeDelta(seconds=0)

    def find_earliest_starting_times(self, lease, nexttime):

        node_ids = [node.id for node in self.resourcepool.get_nodes()]  

        config = get_config()

        mechanism = config.get("transfer-mechanism")

        reusealg = config.get("diskimage-reuse")

        avoidredundant = config.get("avoid-redundant-transfers")

        if type(lease.software) == UnmanagedSoftwareEnvironment:

            earliest = {}

            for node in node_ids:

                earliest[node] = EarliestStartingTime(nexttime, EarliestStartingTime.EARLIEST_NOPREPARATION)

            return earliest

        # Figure out earliest times assuming we have to transfer the images

        transfer_duration = self.__estimate_image_transfer_time(lease, self.imagenode_bandwidth)

        if mechanism == constants.TRANSFER_UNICAST:

            transfer_duration *= lease.numnodes

        start = self.__get_next_transfer_slot(nexttime, transfer_duration)

        earliest = {}

        for node in node_ids:

            earliest[node] = ImageTransferEarliestStartingTime(start + transfer_duration, ImageTransferEarliestStartingTime.EARLIEST_IMAGETRANSFER)

            earliest[node].transfer_start = start

        # Check if we can reuse images

        if reusealg == constants.REUSE_IMAGECACHES:

            nodeswithimg = self.resourcepool.get_nodes_with_reusable_image(lease.software.image_id)

            for node in nodeswithimg:

                earliest[node].time = nexttime

                earliest[node].type = ImageTransferEarliestStartingTime.EARLIEST_REUSE

        # Check if we can avoid redundant transfers

        if avoidredundant:

            if mechanism == constants.TRANSFER_UNICAST:

                # Piggybacking not supported if unicasting 

                # each individual image

                pass

            if mechanism == constants.TRANSFER_MULTICAST:                

                # We can only piggyback on transfers that haven't started yet

                transfers = [t for t in self.transfers if t.state == ResourceReservation.STATE_SCHEDULED]

                for t in transfers:

                    if t.file == lease.software.image_id:

                        start = t.end

                        if start > nexttime:

                            for n in earliest:

                                if start < earliest[n].time:

                                    earliest[n].time = start

                                    earliest[n].type = ImageTransferEarliestStartingTime.EARLIEST_PIGGYBACK

                                    earliest[n].piggybacking_on = t

        return earliest

    def cancel_preparation(self, lease):

        toremove = self.__remove_transfers(lease)     

        for t in toremove:

            t.lease.remove_preparationrr(t)

            self.slottable.remove_reservation(t)

        self.__remove_files(lease)

    def cleanup(self, lease):                

        self.__remove_files(lease)

    def __schedule_deadline(self, lease, vmrr, earliest, nexttime):

        config = get_config()

        reusealg = config.get("diskimage-reuse")

        avoidredundant = config.get("avoid-redundant-transfers")

        is_ready = False

        musttransfer = {}

        mustpool = {}

        nodeassignment = vmrr.nodes

        start = lease.start.requested

        end = lease.start.requested + lease.duration.requested

        for (vnode, pnode) in nodeassignment.items():

            lease_id = lease.id

            self.logger.debug("Scheduling image transfer of '%s' for vnode %i to physnode %i" % (lease.software.image_id, vnode, pnode))

            if reusealg == constants.REUSE_IMAGECACHES:

                if self.resourcepool.exists_reusable_image(pnode, lease.software.image_id, start):

                    self.logger.debug("No need to schedule an image transfer (reusing an image in pool)")

                    mustpool[vnode] = pnode                            

                else:

                    self.logger.debug("Need to schedule a transfer.")

                    musttransfer[vnode] = pnode

            else:

                self.logger.debug("Need to schedule a transfer.")

                musttransfer[vnode] = pnode

        if len(musttransfer) == 0:

            is_ready = True

            transfer_rrs = []

        else:

            try:

                transfer_rrs = self.__schedule_imagetransfer_edf(lease, musttransfer, earliest, nexttime)

            except NotSchedulableException, exc:

                raise

        # No chance of scheduling exception at this point. It's safe

        # to add entries to the pools

        if reusealg == constants.REUSE_IMAGECACHES:

            for (vnode, pnode) in mustpool.items():

                self.resourcepool.add_mapping_to_existing_reusable_image(pnode, lease.software.image_id, lease.id, vnode, start)

                self.resourcepool.add_diskimage(pnode, lease.software.image_id, lease.software.image_size, lease.id, vnode)

        return transfer_rrs, is_ready

    def __schedule_asap(self, lease, vmrr, earliest, nexttime):

        config = get_config()

        reusealg = config.get("diskimage-reuse")

        avoidredundant = config.get("avoid-redundant-transfers")

        is_ready = False

        transfer_rrs = []

        musttransfer = {}

        piggybacking = []

        for (vnode, pnode) in vmrr.nodes.items():

            earliest_type = earliest[pnode].type

            if earliest_type == ImageTransferEarliestStartingTime.EARLIEST_REUSE:

                # Add to pool

                self.logger.debug("Reusing image for V%i->P%i." % (vnode, pnode))

                self.resourcepool.add_mapping_to_existing_reusable_image(pnode, lease.software.image_id, lease.id, vnode, vmrr.end)

                self.resourcepool.add_diskimage(pnode, lease.software.image_id, lease.software.image_size, lease.id, vnode)

            elif earliest_type == ImageTransferEarliestStartingTime.EARLIEST_PIGGYBACK:

                # We can piggyback on an existing transfer

                transfer_rr = earliest[pnode].piggybacking_on

                transfer_rr.piggyback(lease.id, vnode, pnode)

                self.logger.debug("Piggybacking transfer for V%i->P%i on existing transfer in lease %i." % (vnode, pnode, transfer_rr.lease.id))

                piggybacking.append(transfer_rr)

            else:

                # Transfer

                musttransfer[vnode] = pnode

                self.logger.debug("Must transfer V%i->P%i." % (vnode, pnode))

        if len(musttransfer)>0:

            transfer_rrs = self.__schedule_imagetransfer_fifo(lease, musttransfer, earliest)

        if len(musttransfer)==0 and len(piggybacking)==0:

            is_ready = True

        return transfer_rrs, is_ready

    def __schedule_imagetransfer_edf(self, lease, musttransfer, earliest, nexttime):

        # Estimate image transfer time 

        bandwidth = self.deployment_enact.get_bandwidth()

        config = get_config()

        mechanism = config.get("transfer-mechanism")

        transfer_duration = self.__estimate_image_transfer_time(lease, bandwidth)

        if mechanism == constants.TRANSFER_UNICAST:

            transfer_duration *= len(musttransfer)

        # Determine start time

        start = self.__get_last_transfer_slot(lease.start.requested, transfer_duration)

        if start < nexttime:

            raise NotSchedulableException("Could not schedule the file transfer to complete in time.")

        res = {}

        resimgnode = Capacity([constants.RES_NETOUT])

        resimgnode.set_quantity(constants.RES_NETOUT, bandwidth)

        resnode = Capacity([constants.RES_NETIN])

        resnode.set_quantity(constants.RES_NETIN, bandwidth)

        res[self.imagenode.id] = self.slottable.create_resource_tuple_from_capacity(resimgnode)

        for pnode in musttransfer.values():

            res[pnode] = self.slottable.create_resource_tuple_from_capacity(resnode)

        newtransfer = FileTransferResourceReservation(lease, res)

        newtransfer.deadline = lease.start.requested

        newtransfer.state = ResourceReservation.STATE_SCHEDULED

        newtransfer.file = lease.software.image_id

        newtransfer.start = start

        newtransfer.end = start + transfer_duration

        for vnode, pnode in musttransfer.items():

            newtransfer.piggyback(lease.id, vnode, pnode)

        bisect.insort(self.transfers, newtransfer)

        return [newtransfer]

    def __schedule_imagetransfer_fifo(self, lease, musttransfer, earliest):

        # Estimate image transfer time 

        bandwidth = self.imagenode_bandwidth

        config = get_config()

        mechanism = config.get("transfer-mechanism")

        # The starting time is the first available slot, which was

        # included in the "earliest" dictionary.

        pnodes = musttransfer.values()

        start = earliest[pnodes[0]].transfer_start

        transfer_duration = self.__estimate_image_transfer_time(lease, bandwidth)

        res = {}

        resimgnode = Capacity([constants.RES_NETOUT])

        resimgnode.set_quantity(constants.RES_NETOUT, bandwidth)

        resnode = Capacity([constants.RES_NETIN])

        resnode.set_quantity(constants.RES_NETIN, bandwidth)

        res[self.imagenode.id] = self.slottable.create_resource_tuple_from_capacity(resimgnode)

        for n in musttransfer.values():

            res[n] = self.slottable.create_resource_tuple_from_capacity(resnode)

        newtransfer = FileTransferResourceReservation(lease, res)

        newtransfer.start = start

        if mechanism == constants.TRANSFER_UNICAST:

            newtransfer.end = start + (len(musttransfer) * transfer_duration)

        if mechanism == constants.TRANSFER_MULTICAST:

            newtransfer.end = start + transfer_duration

        newtransfer.deadline = None

        newtransfer.state = ResourceReservation.STATE_SCHEDULED

        newtransfer.file = lease.software.image_id

        for vnode, pnode in musttransfer.items():

            newtransfer.piggyback(lease.id, vnode, pnode)

        bisect.insort(self.transfers, newtransfer)

        return [newtransfer]

    def __estimate_image_transfer_time(self, lease, bandwidth):

        config = get_config()

        force_transfer_time = config.get("force-imagetransfer-time")

        if force_transfer_time != None:

            return force_transfer_time

        else:      

            return estimate_transfer_time(lease.software.image_size, bandwidth)    

    def __get_next_transfer_slot(self, nexttime, required_duration):

        # This can probably be optimized by using one of the many

        # "list of holes" algorithms out there

        if len(self.transfers) == 0:

            return nexttime

        elif nexttime + required_duration <= self.transfers[0].start:

            return nexttime

        else:

            for i in xrange(len(self.transfers) - 1):

                if self.transfers[i].end != self.transfers[i+1].start:

                    hole_duration = self.transfers[i+1].start - self.transfers[i].end

                    if hole_duration >= required_duration:

                        return self.transfers[i].end

            return self.transfers[-1].end

    def __get_last_transfer_slot(self, deadline, required_duration):

        # This can probably be optimized by using one of the many

        # "list of holes" algorithms out there

        if len(self.transfers) == 0:

            return deadline - required_duration

        elif self.transfers[-1].end + required_duration <= deadline:

            return deadline - required_duration

        else:

            for i in xrange(len(self.transfers) - 1, 0, -1):

                hole_start =  self.transfers[i-1].end

                hole_end = self.transfers[i].start

                if deadline > hole_start and deadline <= hole_end:

                    hole_duration = deadline - hole_start

                else:

                    hole_duration = hole_end - hole_start

                if hole_duration < required_duration or hole_start >= deadline:

                    # We're not interested in gaps after the deadline

                    # or gaps insufficient to support the transfer

                    pass

                else:

                    if deadline > hole_start and deadline <= hole_end:

                        return deadline - required_duration

                    else:

                        return hole_end - required_duration                    

            return self.transfers[0].start - required_duration

    def __remove_transfers(self, lease):

        toremove = []

        for t in self.transfers:

            for pnode in t.transfers:

                leases = [l for l, v in t.transfers[pnode]]

                if lease.id in leases:

                    newtransfers = [(l, v) for l, v in t.transfers[pnode] if l!=lease.id]

                    t.transfers[pnode] = newtransfers

            # Check if the transfer has to be cancelled

            a = sum([len(l) for l in t.transfers.values()])

            if a == 0:

                toremove.append(t)

        for t in toremove:

            self.transfers.remove(t)

        return toremove

    def __remove_files(self, lease):

        for vnode, pnode in lease.get_last_vmrr().nodes.items():

            self.resourcepool.remove_diskimage(pnode, lease.id, vnode)         

    @staticmethod

    def _handle_start_filetransfer(sched, lease, rr):

        sched.logger.debug("LEASE-%i Start of handleStartFileTransfer" % lease.id)

        lease.print_contents()

        lease_state = lease.get_state()

        if lease_state == Lease.STATE_SCHEDULED or lease_state == Lease.STATE_READY:

            lease.set_state(Lease.STATE_PREPARING)

            rr.state = ResourceReservation.STATE_ACTIVE

            # TODO: Enactment

        else:

            raise InconsistentLeaseStateError(lease, doing = "starting a file transfer")

        # TODO: Check for piggybacking

        lease.print_contents()

        sched.logger.debug("LEASE-%i End of handleStartFileTransfer" % lease.id)

        sched.logger.info("Starting image transfer for lease %i" % (lease.id))

    @staticmethod

    def _handle_end_filetransfer(sched, lease, rr):

        sched.logger.debug("LEASE-%i Start of handleEndFileTransfer" % lease.id)

        lease.print_contents()

        lease_state = lease.get_state()

        if lease_state == Lease.STATE_PREPARING:

            lease.set_state(Lease.STATE_READY)

            rr.state = ResourceReservation.STATE_DONE

            for physnode in rr.transfers:

                vnodes = rr.transfers[physnode]

#                # Find out timeout of image. It will be the latest end time of all the

#                # leases being used by that image.

#                leases = [l for (l, v) in vnodes]

#                maxend=None

#                for lease_id in leases:

#                    l = sched.leases.get_lease(lease_id)

#                    end = lease.get_endtime()

#                    if maxend==None or end>maxend:

#                        maxend=end

                maxend = None

                # TODO: ENACTMENT: Verify the image was transferred correctly

                sched._add_diskimages(physnode, rr.file, lease.software.image_size, vnodes, timeout=maxend)

        else:

            raise InconsistentLeaseStateError(lease, doing = "ending a file transfer")

        sched.transfers.remove(rr)

        lease.print_contents()

        sched.logger.debug("LEASE-%i End of handleEndFileTransfer" % lease.id)

        sched.logger.info("Completed image transfer for lease %i" % (lease.id))

    def _handle_start_migrate(self, l, rr):

        self.logger.debug("LEASE-%i Start of handleStartMigrate" % l.id)

        l.print_contents()

        rr.state = ResourceReservation.STATE_ACTIVE

        l.print_contents()

        self.logger.debug("LEASE-%i End of handleStartMigrate" % l.id)

        self.logger.info("Migrating lease %i..." % (l.id))

    def _handle_end_migrate(self, l, rr):

        self.logger.debug("LEASE-%i Start of handleEndMigrate" % l.id)

        l.print_contents()

        for vnode in rr.transfers:

            origin = rr.transfers[vnode][0]

            dest = rr.transfers[vnode][1]

            self.resourcepool.remove_diskimage(origin, l.id, vnode)

            self.resourcepool.add_diskimage(dest, l.software.image_id, l.software.image_size, l.id, vnode)

        rr.state = ResourceReservation.STATE_DONE

        l.print_contents()

        self.logger.debug("LEASE-%i End of handleEndMigrate" % l.id)

        self.logger.info("Migrated lease %i..." % (l.id))

    def _add_diskimages(self, pnode_id, diskimage_id, diskimage_size, vnodes, timeout):

        self.logger.debug("Adding image for leases=%s in nod_id=%i" % (vnodes, pnode_id))

        config = get_config()

        reusealg = config.get("diskimage-reuse")

        if reusealg == constants.REUSE_IMAGECACHES:

            maxcachesize = config.get("diskimage-cache-size")

        else:

            maxcachesize = None

        pnode = self.resourcepool.get_node(pnode_id)

        if reusealg == constants.REUSE_NONE:

            for (lease_id, vnode) in vnodes:

                self.resourcepool.add_diskimage(pnode_id, diskimage_id, diskimage_size, lease_id, vnode)

        elif reusealg == constants.REUSE_IMAGECACHES:

            # Sometimes we might find that the image is already deployed

            # (although unused). In that case, don't add another copy to

            # the pool. Just "reactivate" it.

            if pnode.exists_reusable_image(diskimage_id):

                for (lease_id, vnode) in vnodes:

                    pnode.add_mapping_to_existing_reusable_image(diskimage_id, lease_id, vnode, timeout)

            else:

                if maxcachesize == constants.CACHESIZE_UNLIMITED:

                    can_add_to_cache = True

                else:

                    # We may have to remove images from the cache

                    cachesize = pnode.get_reusable_images_size()

                    reqsize = cachesize + diskimage_size

                    if reqsize > maxcachesize:

                        # Have to shrink cache

                        desiredsize = maxcachesize - diskimage_size

                        self.logger.debug("Adding the image would make the size of pool in node %i = %iMB. Will try to bring it down to %i" % (pnode_id, reqsize, desiredsize))

                        pnode.print_files()

                        success = pnode.purge_downto(maxcachesize)

                        if not success:

                            can_add_to_cache = False

                        else:

                            can_add_to_cache = True

                    else:

                        can_add_to_cache = True

                if can_add_to_cache:

                    self.resourcepool.add_reusable_image(pnode_id, diskimage_id, diskimage_size, vnodes, timeout)

                else:

                    # This just means we couldn't add the image

                    # to the pool. We will have to make do with just adding the tainted images.

                    self.logger.debug("Unable to add to pool. Must create individual disk images directly instead.")

            # Besides adding the image to the cache, we need to create a separate image for

            # this specific lease

            for (lease_id, vnode) in vnodes:

                self.resourcepool.add_diskimage(pnode_id, diskimage_id, diskimage_size, lease_id, vnode)

        pnode.print_files()

class FileTransferResourceReservation(ResourceReservation):

    def __init__(self, lease, res, start=None, end=None):

        ResourceReservation.__init__(self, lease, start, end, res)

        self.deadline = None

        self.file = None

        # Dictionary of  physnode -> [ (lease_id, vnode)* ]

        self.transfers = {}

    def print_contents(self, loglevel="VDEBUG"):

        ResourceReservation.print_contents(self, loglevel)

        logger = logging.getLogger("LEASES")

        logger.log(loglevel, "Type           : FILE TRANSFER")

        logger.log(loglevel, "Deadline       : %s" % self.deadline)

        logger.log(loglevel, "File           : %s" % self.file)

        logger.log(loglevel, "Transfers      : %s" % self.transfers)

    def piggyback(self, lease_id, vnode, physnode):

        if self.transfers.has_key(physnode):

            self.transfers[physnode].append((lease_id, vnode))

        else:

            self.transfers[physnode] = [(lease_id, vnode)]

    def is_preemptible(self):

        return False       

    def __cmp__(self, rr):

        return cmp(self.start, rr.start)

class ImageTransferEarliestStartingTime(EarliestStartingTime):

    EARLIEST_IMAGETRANSFER = 2

    EARLIEST_REUSE = 3

    EARLIEST_PIGGYBACK = 4

    def __init__(self, time, type):

        EarliestStartingTime.__init__(self, time, type)

        self.transfer_start = None

        self.piggybacking_on = None

class DiskImageMigrationResourceReservation(MigrationResourceReservation):

    def __init__(self, lease, start, end, res, vmrr, transfers):

        MigrationResourceReservation.__init__(self, lease, start, end, res, vmrr, transfers)

    def print_contents(self, loglevel=constants.LOGLEVEL_VDEBUG):

        logger = logging.getLogger("LEASES")

        logger.log(loglevel, "Type           : DISK IMAGE MIGRATION")

        logger.log(loglevel, "Transfers      : %s" % self.transfers)

        ResourceReservation.print_contents(self, loglevel)