Identity service now updates with the network map.

node/src/main/kotlin/com/r3corda/node/internal/AbstractNode.kt

@@ -309,7 +309,9 @@ abstract class AbstractNode(val dir: Path, val configuration: NodeConfiguration,
 
         services.networkMapCache.partyNodes.forEach { service.registerIdentity(it.identity) }
 
-        // TODO: Subscribe to updates to the network map cache
+        netMapCache.added.subscribe { node ->
+            service.registerIdentity(node.identity)
+        }
 
         return service
     }

node/src/main/kotlin/com/r3corda/node/services/network/InMemoryNetworkMapCache.kt

@@ -23,6 +23,8 @@ import com.r3corda.node.services.api.RegulatorService
 import com.r3corda.node.services.clientapi.NodeInterestRates
 import com.r3corda.node.services.transactions.NotaryService
 import com.r3corda.node.utilities.AddOrRemove
+import rx.Observable
+import rx.subjects.PublishSubject
 import java.security.PublicKey
 import java.security.SignatureException
 import java.util.*
@@ -43,7 +45,14 @@ open class InMemoryNetworkMapCache(val netInternal: MessagingServiceInternal?) :
         get() = get(NodeInterestRates.Type)
     override val partyNodes: List<NodeInfo>
         get() = registeredNodes.map { it.value }
+    private val _added = PublishSubject.create<NodeInfo>()
+    private val _removed = PublishSubject.create<NodeInfo>()
+    override val added: Observable<NodeInfo>
+        get() = _added
+    override val removed: Observable<NodeInfo>
+        get() = _removed
 
+    private var listener: (node: NodeInfo, added: Boolean) -> Unit? = { a, b -> Unit}
     private var registeredForPush = false
     protected var registeredNodes = Collections.synchronizedMap(HashMap<Party, NodeInfo>())
 
@@ -95,10 +104,12 @@ open class InMemoryNetworkMapCache(val netInternal: MessagingServiceInternal?) :
     override fun addNode(node: NodeInfo) {
         registeredNodes[node.identity] = node
         netInternal?.registerTrustedAddress(node.address)
+        _added.onNext(node)
     }
 
     override fun removeNode(node: NodeInfo) {
         registeredNodes.remove(node.identity)
+        _removed.onNext(node)
     }
 
     /**

node/src/main/kotlin/com/r3corda/node/services/network/MockNetworkMapCache.kt

@@ -5,11 +5,20 @@ import com.r3corda.core.crypto.DummyPublicKey
 import com.r3corda.core.crypto.Party
 import com.r3corda.core.messaging.SingleMessageRecipient
 import com.r3corda.core.node.NodeInfo
+import rx.Observable
+import rx.subjects.PublishSubject
 
 /**
  * Network map cache with no backing map service.
  */
 class MockNetworkMapCache() : InMemoryNetworkMapCache(null) {
+    private val _added = PublishSubject.create<NodeInfo>()
+    private val _removed = PublishSubject.create<NodeInfo>()
+    override val added: Observable<NodeInfo>
+        get() = _added
+    override val removed: Observable<NodeInfo>
+        get() = _removed
+
     data class MockAddress(val id: String): SingleMessageRecipient
 
     init {