Flow Objective compiler for link collections intents

Change-Id: Ie9d820b1d7d4cdee5411a7318c246c90e3fa91d0

+/*
+ * Copyright 2016 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.intent.impl.compiler;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.Link;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.flow.DefaultTrafficSelector;
+import org.onosproject.net.flow.DefaultTrafficTreatment;
+import org.onosproject.net.flow.TrafficSelector;
+import org.onosproject.net.flow.TrafficTreatment;
+import org.onosproject.net.flowobjective.DefaultForwardingObjective;
+import org.onosproject.net.flowobjective.ForwardingObjective;
+import org.onosproject.net.flowobjective.Objective;
+import org.onosproject.net.intent.FlowObjectiveIntent;
+import org.onosproject.net.intent.Intent;
+import org.onosproject.net.intent.IntentCompiler;
+import org.onosproject.net.intent.IntentExtensionService;
+import org.onosproject.net.intent.LinkCollectionIntent;
+import org.onosproject.net.resource.link.LinkResourceAllocations;
+
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.SetMultimap;
+
+/**
+ * Compiler to produce flow objectives from link collections.
+ */
+@Component(immediate = true)
+public class LinkCollectionIntentFlowObjectivesCompiler implements IntentCompiler<LinkCollectionIntent> {
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected IntentExtensionService intentManager;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CoreService coreService;
+
+    private ApplicationId appId;
+
+    @Activate
+    public void activate() {
+        appId = coreService.registerApplication("org.onosproject.net.intent");
+        //intentManager.registerCompiler(LinkCollectionIntent.class, this);
+    }
+
+    @Deactivate
+    public void deactivate() {
+        //intentManager.unregisterCompiler(LinkCollectionIntent.class);
+    }
+
+    @Override
+    public List<Intent> compile(LinkCollectionIntent intent, List<Intent> installable,
+                                Set<LinkResourceAllocations> resources) {
+        SetMultimap<DeviceId, PortNumber> inputPorts = HashMultimap.create();
+        SetMultimap<DeviceId, PortNumber> outputPorts = HashMultimap.create();
+
+        for (Link link : intent.links()) {
+            inputPorts.put(link.dst().deviceId(), link.dst().port());
+            outputPorts.put(link.src().deviceId(), link.src().port());
+        }
+
+        for (ConnectPoint ingressPoint : intent.ingressPoints()) {
+            inputPorts.put(ingressPoint.deviceId(), ingressPoint.port());
+        }
+
+        for (ConnectPoint egressPoint : intent.egressPoints()) {
+            outputPorts.put(egressPoint.deviceId(), egressPoint.port());
+        }
+
+        List<Objective> objectives = new ArrayList<>();
+        List<DeviceId> devices = new ArrayList<>();
+        for (DeviceId deviceId: outputPorts.keys()) {
+            List<Objective> deviceObjectives =
+                    createRules(intent,
+                                deviceId,
+                                inputPorts.get(deviceId),
+                                outputPorts.get(deviceId));
+            deviceObjectives.forEach(objective -> {
+                objectives.add(objective);
+                devices.add(deviceId);
+            });
+        }
+        return Collections.singletonList(
+                new FlowObjectiveIntent(appId, devices, objectives, intent.resources()));
+    }
+
+    private List<Objective> createRules(LinkCollectionIntent intent, DeviceId deviceId,
+                                       Set<PortNumber> inPorts, Set<PortNumber> outPorts) {
+        Set<PortNumber> ingressPorts = intent.ingressPoints().stream()
+                .filter(point -> point.deviceId().equals(deviceId))
+                .map(ConnectPoint::port)
+                .collect(Collectors.toSet());
+
+        TrafficTreatment.Builder defaultTreatmentBuilder = DefaultTrafficTreatment.builder();
+        outPorts.stream()
+                .forEach(defaultTreatmentBuilder::setOutput);
+        TrafficTreatment defaultTreatment = defaultTreatmentBuilder.build();
+
+        TrafficTreatment.Builder ingressTreatmentBuilder = DefaultTrafficTreatment.builder(intent.treatment());
+        outPorts.stream()
+                .forEach(ingressTreatmentBuilder::setOutput);
+        TrafficTreatment ingressTreatment = ingressTreatmentBuilder.build();
+
+        List<Objective> objectives = new ArrayList<>(inPorts.size());
+        for (PortNumber inPort: inPorts) {
+            TrafficSelector selector = DefaultTrafficSelector.builder(intent.selector()).matchInPort(inPort).build();
+            TrafficTreatment treatment;
+            if (ingressPorts.contains(inPort)) {
+                treatment = ingressTreatment;
+            } else {
+                treatment = defaultTreatment;
+            }
+
+            Objective objective = DefaultForwardingObjective.builder()
+                    .withSelector(selector)
+                    .withTreatment(treatment)
+                    .withPriority(intent.priority())
+                    .fromApp(appId)
+                    .makePermanent()
+                    .withFlag(ForwardingObjective.Flag.VERSATILE)
+                    .add();
+
+            objectives.add(objective);
+        }
+
+        return objectives;
+    }
+}