For convenience, creates RPC snapshot methods for feeds.

client/rpc/src/smoke-test/java/net/corda/java/rpc/StandaloneCordaRPCJavaClientTest.java

@@ -65,8 +65,8 @@ public class StandaloneCordaRPCJavaClientTest {
     }
 
     private NodeInfo fetchNotaryIdentity() {
-        DataFeed<List<NodeInfo>, NetworkMapCache.MapChange> nodeDataFeed = rpcProxy.networkMapFeed();
+        List<NodeInfo> nodeDataSnapshot = rpcProxy.networkMapSnapshot();
-        return nodeDataFeed.getSnapshot().get(0);
+        return nodeDataSnapshot.get(0);
     }
 
     @Test

client/rpc/src/smoke-test/kotlin/net/corda/kotlin/rpc/StandaloneCordaRPClientTest.kt

@@ -202,8 +202,7 @@ class StandaloneCordaRPClientTest {
     }
 
     private fun fetchNotaryIdentity(): NodeInfo {
-        val (nodeInfo, nodeUpdates) = rpcProxy.networkMapFeed()
+        val nodeInfo = rpcProxy.networkMapSnapshot()
-        nodeUpdates.notUsed()
         assertEquals(1, nodeInfo.size)
         return nodeInfo[0]
     }

core/src/main/kotlin/net/corda/core/messaging/CordaRPCOps.kt

@@ -60,6 +60,11 @@ interface CordaRPCOps : RPCOps {
      */
     override val protocolVersion: Int get() = nodeIdentity().platformVersion
 
+    /**
+     * Returns a list of currently in-progress state machine infos.
+     */
+    fun stateMachinesSnapshot(): List<StateMachineInfo>
+
     /**
      * Returns a data feed of currently in-progress state machine infos and an observable of future state machine adds/removes.
      */
@@ -151,12 +156,22 @@ interface CordaRPCOps : RPCOps {
     }
     // DOCEND VaultTrackAPIHelpers
 
+    /**
+     * Returns a list of all recorded transactions.
+     */
+    fun verifiedTransactionsSnapshot(): List<SignedTransaction>
+
     /**
      * Returns a data feed of all recorded transactions and an observable of future recorded ones.
      */
     @RPCReturnsObservables
     fun verifiedTransactionsFeed(): DataFeed<List<SignedTransaction>, SignedTransaction>
 
+    /**
+     * Returns a snapshot list of existing state machine id - recorded transaction hash mappings.
+     */
+    fun stateMachineRecordedTransactionMappingSnapshot(): List<StateMachineTransactionMapping>
+
     /**
      * Returns a snapshot list of existing state machine id - recorded transaction hash mappings, and a stream of future
      * such mappings as well.
@@ -164,6 +179,11 @@ interface CordaRPCOps : RPCOps {
     @RPCReturnsObservables
     fun stateMachineRecordedTransactionMappingFeed(): DataFeed<List<StateMachineTransactionMapping>, StateMachineTransactionMapping>
 
+    /**
+     * Returns all parties currently visible on the network with their advertised services.
+     */
+    fun networkMapSnapshot(): List<NodeInfo>
+
     /**
      * Returns all parties currently visible on the network with their advertised services and an observable of future updates to the network.
      */

docs/source/example-code/src/main/kotlin/net/corda/docs/ClientRpcTutorial.kt

@@ -112,8 +112,7 @@ fun generateTransactions(proxy: CordaRPCOps) {
         sum + state.state.data.amount.quantity
     }
     val issueRef = OpaqueBytes.of(0)
-    val (parties, partyUpdates) = proxy.networkMapFeed()
+    val parties = proxy.networkMapSnapshot()
-    partyUpdates.notUsed()
     val notary = parties.first { it.advertisedServices.any { it.info.type.isNotary() } }.notaryIdentity
     val me = proxy.nodeIdentity().legalIdentity
     while (true) {

node/src/main/kotlin/net/corda/node/internal/CordaRPCOpsImpl.kt

@@ -1,5 +1,6 @@
 package net.corda.node.internal
 
+import net.corda.client.rpc.notUsed
 import net.corda.core.contracts.ContractState
 import net.corda.core.contracts.StateAndRef
 import net.corda.core.contracts.UpgradedContract
@@ -39,6 +40,12 @@ class CordaRPCOpsImpl(
         private val smm: StateMachineManager,
         private val database: CordaPersistence
 ) : CordaRPCOps {
+    override fun networkMapSnapshot(): List<NodeInfo> {
+        val (snapshot, updates) = networkMapFeed()
+        updates.notUsed()
+        return snapshot
+    }
+
     override fun networkMapFeed(): DataFeed<List<NodeInfo>, NetworkMapCache.MapChange> {
         return database.transaction {
             services.networkMapCache.track()
@@ -64,12 +71,24 @@ class CordaRPCOpsImpl(
         }
     }
 
+    override fun verifiedTransactionsSnapshot(): List<SignedTransaction> {
+        val (snapshot, updates) = verifiedTransactionsFeed()
+        updates.notUsed()
+        return snapshot
+    }
+
     override fun verifiedTransactionsFeed(): DataFeed<List<SignedTransaction>, SignedTransaction> {
         return database.transaction {
             services.validatedTransactions.track()
         }
     }
 
+    override fun stateMachinesSnapshot(): List<StateMachineInfo> {
+        val (snapshot, updates) = stateMachinesFeed()
+        updates.notUsed()
+        return snapshot
+    }
+
     override fun stateMachinesFeed(): DataFeed<List<StateMachineInfo>, StateMachineUpdate> {
         return database.transaction {
             val (allStateMachines, changes) = smm.track()
@@ -80,6 +99,12 @@ class CordaRPCOpsImpl(
         }
     }
 
+    override fun stateMachineRecordedTransactionMappingSnapshot(): List<StateMachineTransactionMapping> {
+        val (snapshot, updates) = stateMachineRecordedTransactionMappingFeed()
+        updates.notUsed()
+        return snapshot
+    }
+
     override fun stateMachineRecordedTransactionMappingFeed(): DataFeed<List<StateMachineTransactionMapping>, StateMachineTransactionMapping> {
         return database.transaction {
             services.stateMachineRecordedTransactionMapping.track()

samples/notary-demo/src/main/kotlin/net/corda/notarydemo/Notarise.kt

@@ -27,15 +27,13 @@ fun main(args: Array<String>) {
 /** Interface for using the notary demo API from a client. */
 private class NotaryDemoClientApi(val rpc: CordaRPCOps) {
     private val notary by lazy {
-        val (parties, partyUpdates) = rpc.networkMapFeed()
+        val parties = rpc.networkMapSnapshot()
-        partyUpdates.notUsed()
         val id = parties.stream().filter { it.advertisedServices.any { it.info.type.isNotary() } }.map { it.notaryIdentity }.distinct().asSequence().singleOrNull()
         checkNotNull(id) { "No unique notary identity, try cleaning the node directories." }
     }
 
     private val counterpartyNode by lazy {
-        val (parties, partyUpdates) = rpc.networkMapFeed()
+        val parties = rpc.networkMapSnapshot()
-        partyUpdates.notUsed()
         parties.single { it.legalIdentity.name == BOB.name }
     }
 

samples/simm-valuation-demo/src/main/kotlin/net/corda/vega/api/PortfolioApi.kt

@@ -253,8 +253,7 @@ class PortfolioApi(val rpc: CordaRPCOps) {
     @Path("whoami")
     @Produces(MediaType.APPLICATION_JSON)
     fun getWhoAmI(): AvailableParties {
-        val (parties, partyUpdates) = rpc.networkMapFeed()
+        val parties = rpc.networkMapSnapshot()
-        partyUpdates.notUsed()
         val counterParties = parties.filterNot {
             it.advertisedServices.any { it.info.type in setOf(ServiceType.networkMap, ServiceType.notary) }
                     || it.legalIdentity == ownParty

tools/loadtest/src/main/kotlin/net/corda/loadtest/LoadTest.kt

@@ -181,8 +181,7 @@ fun runLoadTests(configuration: LoadTestConfiguration, tests: List<Pair<LoadTest
             log.info("Getting node info of ${connection.remoteNode.hostname}")
             val info = connection.info
             log.info("Got node info of ${connection.remoteNode.hostname}: $info!")
-            val (otherInfo, infoUpdates) = connection.proxy.networkMapFeed()
+            val otherInfo = connection.proxy.networkMapSnapshot()
-            infoUpdates.notUsed()
             val pubKeysString = otherInfo.map {
                 "    ${it.legalIdentity.name}: ${it.legalIdentity.owningKey.toBase58String()}"
             }.joinToString("\n")