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/*
* Copyright 2015 Open Networking Laboratory
*
* 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
*
* 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.
*/
package org.onosproject.net.flowobjective.impl.composition;
import org.onosproject.net.flowobjective.FilteringObjective;
import org.onosproject.net.flowobjective.ForwardingObjective;
import org.onosproject.net.flowobjective.NextObjective;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* Provides a policy tree to store all flow tables for each device.
*
* Note: This class uses in-memory structures and is not yet distributed.
*/
public class FlowObjectiveCompositionTree {
public FlowObjectiveCompositionManager.PolicyOperator operator;
public FlowObjectiveCompositionTree leftChild;
public FlowObjectiveCompositionTree rightChild;
public short applicationId;
protected FilterTable filterTable;
protected ForwardTable forwardTable;
protected NextTable nextTable;
protected int priorityMultiplier;
protected int priorityAddend;
public FlowObjectiveCompositionTree(short applicationId) {
this.operator = FlowObjectiveCompositionManager.PolicyOperator.Application;
this.leftChild = null;
this.rightChild = null;
this.applicationId = applicationId;
this.filterTable = new FilterTable();
this.forwardTable = new ForwardTable();
this.nextTable = new NextTable();
this.priorityMultiplier = 10;
this.priorityAddend = 10;
}
public FlowObjectiveCompositionTree(Character ch) {
switch (ch) {
case '+':
this.operator = FlowObjectiveCompositionManager.PolicyOperator.Parallel;
break;
case '>':
this.operator = FlowObjectiveCompositionManager.PolicyOperator.Sequential;
break;
case '/':
this.operator = FlowObjectiveCompositionManager.PolicyOperator.Override;
break;
default:
this.operator = FlowObjectiveCompositionManager.PolicyOperator.Application;
break;
}
this.leftChild = null;
this.rightChild = null;
this.applicationId = (short) -1;
this.filterTable = new FilterTable();
this.forwardTable = new ForwardTable();
this.nextTable = new NextTable();
this.priorityMultiplier = 10;
this.priorityAddend = 10;
}
protected List<FilteringObjective> updateFilter(FilteringObjective filteringObjective) {
switch (this.operator) {
case Parallel:
return updateFilterParallel(filteringObjective);
case Sequential:
return updateFilterSequential(filteringObjective);
case Override:
return updateFilterOverride(filteringObjective);
case Application:
if (filteringObjective.appId().id() == this.applicationId) {
return this.filterTable.updateFilter(filteringObjective);
} else {
return new ArrayList<>();
}
default:
return new ArrayList<>();
}
}
// Parallel composition: the filter set is the union of the children
protected List<FilteringObjective> updateFilterParallel(FilteringObjective filteringObjective) {
List<FilteringObjective> leftUpdates = this.leftChild.updateFilter(filteringObjective);
List<FilteringObjective> rightUpdates = this.rightChild.updateFilter(filteringObjective);
List<FilteringObjective> updates = new ArrayList<>();
updates.addAll(leftUpdates);
updates.addAll(rightUpdates);
return this.filterTable.updateFilter(updates);
}
// Sequential composition: the filter set is the filter set of the left child
protected List<FilteringObjective> updateFilterSequential(FilteringObjective filteringObjective) {
List<FilteringObjective> leftUpdates = this.leftChild.updateFilter(filteringObjective);
List<FilteringObjective> rightUpdates = this.rightChild.updateFilter(filteringObjective);
return this.filterTable.updateFilter(leftUpdates);
}
// Override composition: the filter set is the filter set of the left child
protected List<FilteringObjective> updateFilterOverride(FilteringObjective filteringObjective) {
List<FilteringObjective> leftUpdates = this.leftChild.updateFilter(filteringObjective);
List<FilteringObjective> rightUpdates = this.rightChild.updateFilter(filteringObjective);
return this.filterTable.updateFilter(leftUpdates);
}
public List<ForwardingObjective> updateForward(ForwardingObjective forwardingObjective) {
return this.updateForwardNode(forwardingObjective).toForwardingObjectiveList();
}
public ForwardUpdateTable updateForwardNode(ForwardingObjective forwardingObjective) {
switch (this.operator) {
case Parallel:
case Sequential:
case Override:
return updateForwardComposition(forwardingObjective);
case Application:
if (forwardingObjective.appId().id() == this.applicationId) {
return this.forwardTable.updateForward(forwardingObjective);
} else {
return (new ForwardUpdateTable());
}
default:
return (new ForwardUpdateTable());
}
}
protected ForwardUpdateTable updateForwardComposition(ForwardingObjective forwardingObjective) {
ForwardUpdateTable leftUpdates = this.leftChild.updateForwardNode(forwardingObjective);
ForwardUpdateTable rightUpdates = this.rightChild.updateForwardNode(forwardingObjective);
List<ForwardingObjective> addUpdates = new ArrayList<>();
List<ForwardingObjective> removeUpdates = new ArrayList<>();
// Handle ADD
if (this.operator == FlowObjectiveCompositionManager.PolicyOperator.Parallel
|| this.operator == FlowObjectiveCompositionManager.PolicyOperator.Sequential) {
for (ForwardingObjective fo1 : leftUpdates.addObjectives) {
for (ForwardingObjective fo2 : this.rightChild.forwardTable.getForwardingObjectives()) {
ForwardingObjective composedFo = null;
if (this.operator == FlowObjectiveCompositionManager.PolicyOperator.Parallel) {
composedFo = FlowObjectiveCompositionUtil.composeParallel(fo1, fo2);
} else {
composedFo = FlowObjectiveCompositionUtil.composeSequential(fo1, fo2, this.priorityMultiplier);
}
if (composedFo != null) {
addUpdates.add(composedFo);
this.leftChild.forwardTable.addGeneratedParentForwardingObjective(fo1, composedFo);
this.rightChild.forwardTable.addGeneratedParentForwardingObjective(fo2, composedFo);
}
}
}
Collection<ForwardingObjective> leftTableWithoutAdd = FlowObjectiveCompositionUtil
.minusForwardingObjectives(this.leftChild.forwardTable.getForwardingObjectives(),
leftUpdates.addObjectives);
for (ForwardingObjective fo1 : leftTableWithoutAdd) {
for (ForwardingObjective fo2 : rightUpdates.addObjectives) {
ForwardingObjective composedFo = null;
if (this.operator == FlowObjectiveCompositionManager.PolicyOperator.Parallel) {
composedFo = FlowObjectiveCompositionUtil.composeParallel(fo1, fo2);
} else {
composedFo = FlowObjectiveCompositionUtil.composeSequential(fo1, fo2, this.priorityMultiplier);
}
if (composedFo != null) {
addUpdates.add(composedFo);
this.leftChild.forwardTable.addGeneratedParentForwardingObjective(fo1, composedFo);
this.rightChild.forwardTable.addGeneratedParentForwardingObjective(fo2, composedFo);
}
}
}
} else {
for (ForwardingObjective fo : leftUpdates.addObjectives) {
ForwardingObjective composedFo = FlowObjectiveCompositionUtil.composeOverride(fo, this.priorityAddend);
addUpdates.add(composedFo);
this.leftChild.forwardTable.addGeneratedParentForwardingObjective(fo, composedFo);
}
for (ForwardingObjective fo : rightUpdates.addObjectives) {
ForwardingObjective composedFo = FlowObjectiveCompositionUtil.composeOverride(fo, 0);
addUpdates.add(composedFo);
this.rightChild.forwardTable.addGeneratedParentForwardingObjective(fo, composedFo);
}
}
// Handle REMOVE
for (ForwardingObjective fo : leftUpdates.removeObjectives) {
List<ForwardingObjective> fos = this.leftChild.forwardTable
.getGeneratedParentForwardingObjectiveForRemove(fo);
removeUpdates.addAll(fos);
}
this.leftChild.forwardTable.deleteGeneratedParentForwardingObjective(leftUpdates.removeObjectives);
for (ForwardingObjective fo : rightUpdates.removeObjectives) {
List<ForwardingObjective> fos = this.rightChild.forwardTable
.getGeneratedParentForwardingObjectiveForRemove(fo);
removeUpdates.addAll(fos);
}
this.rightChild.forwardTable.deleteGeneratedParentForwardingObjective(rightUpdates.removeObjectives);
ForwardUpdateTable updates = new ForwardUpdateTable();
updates.addUpdateTable(this.forwardTable.updateForward(addUpdates));
updates.addUpdateTable(this.forwardTable.updateForward(removeUpdates));
return updates;
}
public List<NextObjective> updateNext(NextObjective nextObjective) {
switch (this.operator) {
case Parallel:
case Sequential:
case Override:
return updateNextComposition(nextObjective);
case Application:
if (nextObjective.appId().id() == this.applicationId) {
return this.nextTable.updateNext(nextObjective);
} else {
return new ArrayList<>();
}
default:
return new ArrayList<>();
}
}
// Next: the union of the children
protected List<NextObjective> updateNextComposition(NextObjective nextObjective) {
List<NextObjective> leftUpdates = this.leftChild.updateNext(nextObjective);
List<NextObjective> rightUpdates = this.rightChild.updateNext(nextObjective);
List<NextObjective> updates = new ArrayList<>();
updates.addAll(leftUpdates);
updates.addAll(rightUpdates);
return this.nextTable.updateNext(updates);
}
@Override
public String toString() {
String str = null;
switch (this.operator) {
case Parallel:
str = "(" + this.leftChild + "+" + this.rightChild + ")";
break;
case Sequential:
str = "(" + this.leftChild + ">" + this.rightChild + ")";
break;
case Override:
str = "(" + this.leftChild + "/" + this.rightChild + ")";
break;
default:
str = " " + applicationId + " ";
break;
}
return str;
}
}
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