initial sketch of ReplicaInfoService.
Change-Id: I364b023aa6be69cabb184b92fd7a0dadd5215ec9
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/flow/impl/ReplicaInfoManager.java b/core/store/dist/src/main/java/org/onlab/onos/store/flow/impl/ReplicaInfoManager.java
new file mode 100644
index 0000000..0d4cd08
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/flow/impl/ReplicaInfoManager.java
@@ -0,0 +1,82 @@
+package org.onlab.onos.store.flow.impl;
+
+import static org.slf4j.LoggerFactory.getLogger;
+import static org.onlab.onos.store.flow.ReplicaInfoEvent.Type.MASTER_CHANGED;
+
+import java.util.Collections;
+import java.util.List;
+
+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.apache.felix.scr.annotations.Service;
+import org.onlab.onos.cluster.NodeId;
+import org.onlab.onos.event.AbstractListenerRegistry;
+import org.onlab.onos.event.EventDeliveryService;
+import org.onlab.onos.mastership.MastershipEvent;
+import org.onlab.onos.mastership.MastershipListener;
+import org.onlab.onos.mastership.MastershipService;
+import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.store.flow.ReplicaInfo;
+import org.onlab.onos.store.flow.ReplicaInfoEvent;
+import org.onlab.onos.store.flow.ReplicaInfoEventListener;
+import org.onlab.onos.store.flow.ReplicaInfoService;
+import org.slf4j.Logger;
+
+/**
+ * Manages replica placement information.
+ */
+@Component(immediate = true)
+@Service
+public class ReplicaInfoManager implements ReplicaInfoService {
+
+ private final Logger log = getLogger(getClass());
+
+ private final MastershipListener mastershipListener = new InternalMastershipListener();
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected EventDeliveryService eventDispatcher;
+
+ @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+ protected MastershipService mastershipService;
+
+ protected final AbstractListenerRegistry<ReplicaInfoEvent, ReplicaInfoEventListener>
+ listenerRegistry = new AbstractListenerRegistry<>();
+
+ @Activate
+ public void activate() {
+ eventDispatcher.addSink(ReplicaInfoEvent.class, listenerRegistry);
+ mastershipService.addListener(mastershipListener);
+ log.info("Started");
+ }
+
+ @Deactivate
+ public void deactivate() {
+ eventDispatcher.removeSink(ReplicaInfoEvent.class);
+ mastershipService.removeListener(mastershipListener);
+ log.info("Stopped");
+ }
+
+ @Override
+ public ReplicaInfo getReplicaInfoFor(DeviceId deviceId) {
+ // TODO: populate backup List when we reach the point we need them.
+ return new ReplicaInfo(mastershipService.getMasterFor(deviceId),
+ Collections.<NodeId>emptyList());
+ }
+
+ final class InternalMastershipListener implements MastershipListener {
+
+ @Override
+ public void event(MastershipEvent event) {
+ // TODO: distinguish stby list update, when MastershipService,
+ // start publishing them
+ final List<NodeId> standbyList = Collections.<NodeId>emptyList();
+ eventDispatcher.post(new ReplicaInfoEvent(MASTER_CHANGED,
+ event.subject(),
+ new ReplicaInfo(event.master(), standbyList)));
+ }
+ }
+
+}