Add a Multiple source to single destination intent
This is a very simplistic implementation of an intent that
represents multiple sources with a single destination.
The implementaiton is simple, it just computes the union
of the set of path segments needed to satisfy all the connections
and installs them.
The unit test is just a skeleton with a single test case and
needs to be expanded.
diff --git a/core/net/src/main/java/org/onlab/onos/net/intent/impl/MultiPointToSinglePointIntentCompiler.java b/core/net/src/main/java/org/onlab/onos/net/intent/impl/MultiPointToSinglePointIntentCompiler.java
new file mode 100644
index 0000000..68c55dd
--- /dev/null
+++ b/core/net/src/main/java/org/onlab/onos/net/intent/impl/MultiPointToSinglePointIntentCompiler.java
@@ -0,0 +1,85 @@
+package org.onlab.onos.net.intent.impl;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+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.onlab.onos.net.ConnectPoint;
+import org.onlab.onos.net.Link;
+import org.onlab.onos.net.Path;
+import org.onlab.onos.net.intent.IdGenerator;
+import org.onlab.onos.net.intent.Intent;
+import org.onlab.onos.net.intent.IntentCompiler;
+import org.onlab.onos.net.intent.IntentExtensionService;
+import org.onlab.onos.net.intent.IntentId;
+import org.onlab.onos.net.intent.LinkCollectionIntent;
+import org.onlab.onos.net.intent.MultiPointToSinglePointIntent;
+import org.onlab.onos.net.intent.PointToPointIntent;
+import org.onlab.onos.net.topology.PathService;
+
+/**
+ * An intent compiler for
+ * {@link org.onlab.onos.net.intent.MultiPointToSinglePointIntent}.
+ */
+@Component(immediate = true)
+public class MultiPointToSinglePointIntentCompiler
+ implements IntentCompiler<MultiPointToSinglePointIntent> {
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected IntentExtensionService intentManager;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected PathService pathService;
+
+ private IdGenerator<IntentId> intentIdGenerator;
+
+ @Activate
+ public void activate() {
+ IdBlockAllocator idBlockAllocator = new DummyIdBlockAllocator();
+ intentIdGenerator = new IdBlockAllocatorBasedIntentIdGenerator(idBlockAllocator);
+ intentManager.registerCompiler(MultiPointToSinglePointIntent.class, this);
+ }
+
+ @Deactivate
+ public void deactivate() {
+ intentManager.unregisterCompiler(PointToPointIntent.class);
+ }
+
+ @Override
+ public List<Intent> compile(MultiPointToSinglePointIntent intent) {
+ Set<Link> links = new HashSet<>();
+
+ for (ConnectPoint ingressPoint : intent.ingressPoints()) {
+ Path path = getPath(ingressPoint, intent.egressPoint());
+ links.addAll(path.links());
+ }
+
+ Intent result = new LinkCollectionIntent(intentIdGenerator.getNewId(),
+ intent.selector(), intent.treatment(),
+ links);
+ return Arrays.asList(result);
+ }
+
+ /**
+ * Computes a path between two ConnectPoints.
+ *
+ * @param one start of the path
+ * @param two end of the path
+ * @return Path between the two
+ * @throws org.onlab.onos.net.intent.impl.PathNotFoundException if a path cannot be found
+ */
+ private Path getPath(ConnectPoint one, ConnectPoint two) {
+ Set<Path> paths = pathService.getPaths(one.deviceId(), two.deviceId());
+ if (paths.isEmpty()) {
+ throw new PathNotFoundException("No path from " + one + " to " + two);
+ }
+ // TODO: let's be more intelligent about this eventually
+ return paths.iterator().next();
+ }
+}