Removed createHandle from the FlowStateMachine interface as it doesn't need to be publicly exposed

core/src/main/kotlin/net/corda/core/flows/FlowStateMachine.kt

@@ -5,7 +5,6 @@ import com.google.common.util.concurrent.ListenableFuture
 import net.corda.core.contracts.ScheduledStateRef
 import net.corda.core.crypto.Party
 import net.corda.core.crypto.SecureHash
-import net.corda.core.messaging.FlowHandle
 import net.corda.core.node.ServiceHub
 import net.corda.core.serialization.CordaSerializable
 import net.corda.core.transactions.SignedTransaction
@@ -16,12 +15,11 @@ import java.util.*
 /**
  * FlowInitiator holds information on who started the flow. We have different ways of doing that: via RPC [FlowInitiator.RPC],
  * communication started by peer node [FlowInitiator.Peer], scheduled flows [FlowInitiator.Scheduled]
- * or manual [FlowInitiator.Manual]. The last case is for all flows started in tests, shell etc. It was added
- * because we can start flow directly using [StateMachineManager.add] or [ServiceHubInternal.startFlow].
+ * or via the Corda Shell [FlowInitiator.Shell].
  */
 @CordaSerializable
 sealed class FlowInitiator {
-    /** Started using [CordaRPCOps.startFlowDynamic]. */
+    /** Started using [net.corda.core.messaging.CordaRPCOps.startFlowDynamic]. */
     data class RPC(val username: String) : FlowInitiator()
     /** Started when we get new session initiation request. */
     data class Peer(val party: Party) : FlowInitiator()
@@ -61,8 +59,6 @@ interface FlowStateMachine<R> {
     @Suspendable
     fun waitForLedgerCommit(hash: SecureHash, sessionFlow: FlowLogic<*>): SignedTransaction
 
-    fun createHandle(hasProgress: Boolean): FlowHandle<R>
-
     val serviceHub: ServiceHub
     val logger: Logger
     val id: StateMachineRunId

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

@@ -13,6 +13,11 @@ import rx.Observable
 interface FlowHandle<A> : AutoCloseable {
     val id: StateMachineRunId
     val returnValue: ListenableFuture<A>
+
+    /**
+     * Use this function for flows whose returnValue is not going to be used, so as to free up server resources.
+     */
+    override fun close()
 }
 
 /**
@@ -22,4 +27,11 @@ interface FlowHandle<A> : AutoCloseable {
  */
 interface FlowProgressHandle<A> : FlowHandle<A> {
     val progress: Observable<String>
+
+    /**
+     * Use this function for flows whose returnValue and progress are not going to be used or tracked, so as to free up
+     * server resources.
+     * Note that it won't really close if one subscribes on progress [Observable], but then forgets to unsubscribe.
+     */
+    override fun close()
 }

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

@@ -10,7 +10,10 @@ import net.corda.core.contracts.Amount
 import net.corda.core.contracts.PartyAndReference
 import net.corda.core.crypto.Party
 import net.corda.core.crypto.X509Utilities
-import net.corda.core.flows.*
+import net.corda.core.flows.FlowInitiator
+import net.corda.core.flows.FlowLogic
+import net.corda.core.flows.FlowLogicRefFactory
+import net.corda.core.flows.FlowVersion
 import net.corda.core.messaging.CordaRPCOps
 import net.corda.core.messaging.RPCOps
 import net.corda.core.messaging.SingleMessageRecipient
@@ -43,6 +46,7 @@ import net.corda.node.services.network.PersistentNetworkMapService
 import net.corda.node.services.persistence.*
 import net.corda.node.services.schema.HibernateObserver
 import net.corda.node.services.schema.NodeSchemaService
+import net.corda.node.services.statemachine.FlowStateMachineImpl
 import net.corda.node.services.statemachine.StateMachineManager
 import net.corda.node.services.statemachine.flowVersion
 import net.corda.node.services.transactions.*
@@ -131,7 +135,7 @@ abstract class AbstractNode(open val configuration: NodeConfiguration,
         override val monitoringService: MonitoringService = MonitoringService(MetricRegistry())
         override val flowLogicRefFactory: FlowLogicRefFactory get() = flowLogicFactory
 
-        override fun <T> startFlow(logic: FlowLogic<T>, flowInitiator: FlowInitiator): FlowStateMachine<T> {
+        override fun <T> startFlow(logic: FlowLogic<T>, flowInitiator: FlowInitiator): FlowStateMachineImpl<T> {
             return serverThread.fetchFrom { smm.add(logic, flowInitiator) }
         }
 

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

@@ -1,5 +1,7 @@
 package net.corda.node.internal
 
+import com.google.common.util.concurrent.ListenableFuture
+import net.corda.client.rpc.notUsed
 import net.corda.core.contracts.Amount
 import net.corda.core.contracts.ContractState
 import net.corda.core.contracts.StateAndRef
@@ -13,14 +15,15 @@ import net.corda.core.node.NodeInfo
 import net.corda.core.node.services.NetworkMapCache
 import net.corda.core.node.services.StateMachineTransactionMapping
 import net.corda.core.node.services.Vault
+import net.corda.core.serialization.CordaSerializable
 import net.corda.core.transactions.SignedTransaction
 import net.corda.node.services.api.ServiceHubInternal
 import net.corda.node.services.messaging.requirePermission
 import net.corda.node.services.startFlowPermission
 import net.corda.node.services.statemachine.StateMachineManager
 import net.corda.node.utilities.transaction
-import org.bouncycastle.asn1.x500.X500Name
 import net.corda.nodeapi.CURRENT_RPC_USER
+import org.bouncycastle.asn1.x500.X500Name
 import org.jetbrains.exposed.sql.Database
 import rx.Observable
 import java.io.InputStream
@@ -100,14 +103,20 @@ class CordaRPCOpsImpl(
     override fun <T : Any> startTrackedFlowDynamic(logicType: Class<out FlowLogic<T>>, vararg args: Any?): FlowProgressHandle<T> {
         requirePermission(startFlowPermission(logicType))
         val currentUser = FlowInitiator.RPC(CURRENT_RPC_USER.get().username)
-        return services.invokeFlowAsync(logicType, currentUser, *args).createHandle(hasProgress = true) as FlowProgressHandle<T>
+        val stateMachine = services.invokeFlowAsync(logicType, currentUser, *args)
+        return FlowProgressHandleImpl(
+                id = stateMachine.id,
+                returnValue = stateMachine.resultFuture,
+                progress = stateMachine.logic.track()?.second ?: Observable.empty()
+        )
     }
 
     // TODO: Check that this flow is annotated as being intended for RPC invocation
     override fun <T : Any> startFlowDynamic(logicType: Class<out FlowLogic<T>>, vararg args: Any?): FlowHandle<T> {
         requirePermission(startFlowPermission(logicType))
         val currentUser = FlowInitiator.RPC(CURRENT_RPC_USER.get().username)
-        return services.invokeFlowAsync(logicType, currentUser, *args).createHandle(hasProgress = false)
+        val stateMachine = services.invokeFlowAsync(logicType, currentUser, *args)
+        return FlowHandleImpl(id = stateMachine.id, returnValue = stateMachine.resultFuture)
     }
 
     override fun attachmentExists(id: SecureHash): Boolean {
@@ -161,4 +170,31 @@ class CordaRPCOpsImpl(
             }
         }
     }
+
+    // I would prefer for [FlowProgressHandleImpl] to extend [FlowHandleImpl],
+    // but Kotlin doesn't allow this for data classes, not even to create
+    // another data class!
+    @CordaSerializable
+    private data class FlowHandleImpl<A>(
+            override val id: StateMachineRunId,
+            override val returnValue: ListenableFuture<A>) : FlowHandle<A> {
+
+        // Remember to add @Throws to FlowHandle.close if this throws an exception
+        override fun close() {
+            returnValue.cancel(false)
+        }
+    }
+
+    @CordaSerializable
+    private data class FlowProgressHandleImpl<A>(
+            override val id: StateMachineRunId,
+            override val returnValue: ListenableFuture<A>,
+            override val progress: Observable<String>) : FlowProgressHandle<A> {
+
+        // Remember to add @Throws to FlowProgressHandle.close if this throws an exception
+        override fun close() {
+            progress.notUsed()
+            returnValue.cancel(false)
+        }
+    }
 }

node/src/main/kotlin/net/corda/node/services/api/ServiceHubInternal.kt

@@ -101,7 +101,7 @@ abstract class ServiceHubInternal : PluginServiceHub {
      * Starts an already constructed flow. Note that you must be on the server thread to call this method.
      * @param flowInitiator indicates who started the flow, see: [FlowInitiator].
      */
-    abstract fun <T> startFlow(logic: FlowLogic<T>, flowInitiator: FlowInitiator): FlowStateMachine<T>
+    abstract fun <T> startFlow(logic: FlowLogic<T>, flowInitiator: FlowInitiator): FlowStateMachineImpl<T>
 
 
     /**
@@ -115,7 +115,7 @@ abstract class ServiceHubInternal : PluginServiceHub {
     fun <T : Any> invokeFlowAsync(
             logicType: Class<out FlowLogic<T>>,
             flowInitiator: FlowInitiator,
-            vararg args: Any?): FlowStateMachine<T> {
+            vararg args: Any?): FlowStateMachineImpl<T> {
         val logicRef = flowLogicRefFactory.create(logicType, *args)
         @Suppress("UNCHECKED_CAST")
         val logic = flowLogicRefFactory.toFlowLogic(logicRef) as FlowLogic<T>

node/src/main/kotlin/net/corda/node/services/statemachine/FlowStateMachineImpl.kt

@@ -6,16 +6,12 @@ import co.paralleluniverse.fibers.Suspendable
 import co.paralleluniverse.strands.Strand
 import com.google.common.util.concurrent.ListenableFuture
 import com.google.common.util.concurrent.SettableFuture
-import net.corda.client.rpc.notUsed
 import net.corda.core.ErrorOr
 import net.corda.core.abbreviate
 import net.corda.core.crypto.Party
 import net.corda.core.crypto.SecureHash
 import net.corda.core.flows.*
-import net.corda.core.messaging.FlowHandle
-import net.corda.core.messaging.FlowProgressHandle
 import net.corda.core.random63BitValue
-import net.corda.core.serialization.CordaSerializable
 import net.corda.core.transactions.SignedTransaction
 import net.corda.core.utilities.ProgressTracker
 import net.corda.core.utilities.UntrustworthyData
@@ -29,7 +25,6 @@ import org.jetbrains.exposed.sql.Transaction
 import org.jetbrains.exposed.sql.transactions.TransactionManager
 import org.slf4j.Logger
 import org.slf4j.LoggerFactory
-import rx.Observable
 import java.lang.reflect.Modifier
 import java.sql.Connection
 import java.sql.SQLException
@@ -102,15 +97,6 @@ class FlowStateMachineImpl<R>(override val id: StateMachineRunId,
         logic.stateMachine = this
     }
 
-    override fun createHandle(hasProgress: Boolean): FlowHandle<R> = if (hasProgress)
-        FlowProgressHandleImpl(
-            id = id,
-            returnValue = resultFuture,
-            progress = logic.track()?.second ?: Observable.empty()
-        )
-    else
-        FlowHandleImpl(id = id, returnValue = resultFuture)
-
     @Suspendable
     override fun run() {
         createTransaction()
@@ -444,35 +430,3 @@ val Class<out FlowLogic<*>>.flowVersion: Int get() {
     require(flowVersion.value > 0) { "Flow versions have to be greater or equal to 1" }
     return flowVersion.value
 }
-
-// I would prefer for [FlowProgressHandleImpl] to extend [FlowHandleImpl],
-// but Kotlin doesn't allow this for data classes, not even to create
-// another data class!
-@CordaSerializable
-private data class FlowHandleImpl<A>(
-        override val id: StateMachineRunId,
-        override val returnValue: ListenableFuture<A>) : FlowHandle<A> {
-
-    /**
-     * Use this function for flows whose returnValue is not going to be used, so as to free up server resources.
-     */
-    override fun close() {
-        returnValue.cancel(false)
-    }
-}
-
-@CordaSerializable
-private data class FlowProgressHandleImpl<A>(
-        override val id: StateMachineRunId,
-        override val returnValue: ListenableFuture<A>,
-        override val progress: Observable<String>) : FlowProgressHandle<A> {
-
-    /**
-     * Use this function for flows whose returnValue and progress are not going to be used or tracked, so as to free up server resources.
-     * Note that it won't really close if one subscribes on progress [Observable], but then forgets to unsubscribe.
-     */
-    override fun close() {
-        progress.notUsed()
-        returnValue.cancel(false)
-    }
-}

node/src/main/kotlin/net/corda/node/services/statemachine/StateMachineManager.kt

@@ -485,7 +485,7 @@ class StateMachineManager(val serviceHub: ServiceHubInternal,
      *
      * Note that you must be on the [executor] thread.
      */
-    fun <T> add(logic: FlowLogic<T>, flowInitiator: FlowInitiator): FlowStateMachine<T> {
+    fun <T> add(logic: FlowLogic<T>, flowInitiator: FlowInitiator): FlowStateMachineImpl<T> {
         // TODO: Check that logic has @Suspendable on its call method.
         executor.checkOnThread()
         // We swap out the parent transaction context as using this frequently leads to a deadlock as we wait

node/src/test/kotlin/net/corda/node/InteractiveShellTest.kt

@@ -6,11 +6,9 @@ import net.corda.core.contracts.Amount
 import net.corda.core.crypto.Party
 import net.corda.core.crypto.SecureHash
 import net.corda.core.flows.FlowInitiator
-import net.corda.core.crypto.X509Utilities
 import net.corda.core.flows.FlowLogic
 import net.corda.core.flows.FlowStateMachine
 import net.corda.core.flows.StateMachineRunId
-import net.corda.core.messaging.FlowProgressHandle
 import net.corda.core.node.ServiceHub
 import net.corda.core.transactions.SignedTransaction
 import net.corda.core.utilities.DUMMY_PUBKEY_1
@@ -31,7 +29,7 @@ class InteractiveShellTest {
         constructor(b: Int, c: String) : this(b.toString() + c)
         constructor(amount: Amount<Currency>) : this(amount.toString())
         constructor(pair: Pair<Amount<Currency>, SecureHash.SHA256>) : this(pair.toString())
-        constructor(party: Party) : this(party.name.toString())
+        constructor(party: Party) : this(party.name)
         override fun call() = a
     }
 
@@ -69,7 +67,7 @@ class InteractiveShellTest {
     fun flowTooManyParams() = check("b: 12, c: Yo, d: Bar", "")
 
     @Test
-    fun party() = check("party: \"${someCorpLegalName}\"", someCorpLegalName.toString())
+    fun party() = check("party: \"$someCorpLegalName\"", someCorpLegalName)
 
     class DummyFSM(val logic: FlowA) : FlowStateMachine<Any?> {
         override fun <T : Any> sendAndReceive(receiveType: Class<T>, otherParty: Party, payload: Any, sessionFlow: FlowLogic<*>, retrySend: Boolean): UntrustworthyData<T> {
@@ -88,8 +86,6 @@ class InteractiveShellTest {
             throw UnsupportedOperationException("not implemented")
         }
 
-        override fun createHandle(hasProgress: Boolean): FlowProgressHandle<Any?> = throw UnsupportedOperationException("not implemented")
-
         override val serviceHub: ServiceHub
             get() = throw UnsupportedOperationException()
         override val logger: Logger

node/src/test/kotlin/net/corda/node/services/MockServiceHubInternal.kt

@@ -5,7 +5,6 @@ import net.corda.core.crypto.Party
 import net.corda.core.flows.FlowInitiator
 import net.corda.core.flows.FlowLogic
 import net.corda.core.flows.FlowLogicRefFactory
-import net.corda.core.flows.FlowStateMachine
 import net.corda.core.node.NodeInfo
 import net.corda.core.node.services.*
 import net.corda.core.transactions.SignedTransaction
@@ -14,6 +13,7 @@ import net.corda.node.serialization.NodeClock
 import net.corda.node.services.api.*
 import net.corda.node.services.messaging.MessagingService
 import net.corda.node.services.schema.NodeSchemaService
+import net.corda.node.services.statemachine.FlowStateMachineImpl
 import net.corda.node.services.statemachine.StateMachineManager
 import net.corda.node.services.transactions.InMemoryTransactionVerifierService
 import net.corda.testing.MOCK_IDENTITY_SERVICE
@@ -69,7 +69,7 @@ open class MockServiceHubInternal(
 
     override fun recordTransactions(txs: Iterable<SignedTransaction>) = recordTransactionsInternal(txStorageService, txs)
 
-    override fun <T> startFlow(logic: FlowLogic<T>, flowInitiator: FlowInitiator): FlowStateMachine<T> {
+    override fun <T> startFlow(logic: FlowLogic<T>, flowInitiator: FlowInitiator): FlowStateMachineImpl<T> {
         return smm.executor.fetchFrom { smm.add(logic, flowInitiator) }
     }