Additional method on VaultService to retrieve notes for a transaction

core/src/main/kotlin/com/r3corda/core/node/services/Services.kt

@@ -154,6 +154,8 @@ interface VaultService {
      *  Add a note to an existing [LedgerTransaction] given by its unique [SecureHash] id
      */
     fun addNoteToTransaction(txnId: SecureHash, noteText: String)
+
+    fun getTransactionNotes(txnId: SecureHash): Iterable<String>
 }
 
 inline fun <reified T : LinearState> VaultService.linearHeadsOfType() = linearHeadsOfType_(T::class.java)

core/src/main/kotlin/com/r3corda/core/testing/InMemoryVaultService.kt

@@ -99,6 +99,10 @@ open class InMemoryVaultService(protected val services: ServiceHub) : SingletonS
         throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
     }
 
+    override fun getTransactionNotes(txnId: SecureHash): Iterable<String> {
+        throw UnsupportedOperationException("not implemented") //To change body of created functions use File | Settings | File Templates.
+    }
+
     private fun isRelevant(state: ContractState, ourKeys: Set<PublicKey>): Boolean {
         return if (state is OwnableState) {
             state.owner in ourKeys

node/src/main/kotlin/com/r3corda/node/services/vault/NodeVaultService.kt

@@ -13,6 +13,7 @@ import com.r3corda.core.transactions.WireTransaction
 import com.r3corda.core.utilities.loggerFor
 import com.r3corda.core.utilities.trace
 import com.r3corda.node.utilities.*
+import kotlinx.support.jdk8.collections.putIfAbsent
 import org.jetbrains.exposed.sql.ResultRow
 import org.jetbrains.exposed.sql.statements.InsertStatement
 import rx.Observable
@@ -134,9 +135,16 @@ class NodeVaultService(private val services: ServiceHub) : SingletonSerializeAsT
 
     override fun addNoteToTransaction(txnId: SecureHash, noteText: String) {
         mutex.locked {
-            transactionNotes.getOrPut(key = txnId, defaultValue = {
+            val notes = transactionNotes.getOrPut(key = txnId, defaultValue = {
                 setOf(noteText)
-            }).plus(noteText)
+            })
+            transactionNotes.put(txnId, notes.plus(noteText))
+        }
+    }
+
+    override fun getTransactionNotes(txnId: SecureHash): Iterable<String> {
+        mutex.locked {
+            return transactionNotes.get(txnId)!!.asIterable()
         }
     }
 

node/src/test/kotlin/com/r3corda/node/services/NodeVaultServiceTest.kt

@@ -3,6 +3,7 @@ package com.r3corda.node.services
 import com.r3corda.contracts.asset.Cash
 import com.r3corda.contracts.testing.fillWithSomeTestCash
 import com.r3corda.core.contracts.DOLLARS
+import com.r3corda.core.contracts.POUNDS
 import com.r3corda.core.contracts.TransactionType
 import com.r3corda.core.contracts.`issued by`
 import com.r3corda.core.node.services.TxWritableStorageService
@@ -109,9 +110,23 @@ class NodeVaultServiceTest {
 
             services.recordTransactions(listOf(usefulTX))
 
-            services.vaultService.addNoteToTransaction(usefulTX.id, "Sample Note 1")
+            services.vaultService.addNoteToTransaction(usefulTX.id, "USD Sample Note 1")
+            services.vaultService.addNoteToTransaction(usefulTX.id, "USD Sample Note 2")
+            services.vaultService.addNoteToTransaction(usefulTX.id, "USD Sample Note 3")
             assertEquals(1, services.vaultService.currentVault.transactionNotes.toList().size)
+            assertEquals(3, services.vaultService.getTransactionNotes(usefulTX.id).count())
 
+            // Issue more Money (GBP)
+            val anotherTX = TransactionType.General.Builder(null).apply {
+                Cash().generateIssue(this, 200.POUNDS `issued by` MEGA_CORP.ref(1), freshKey.public, DUMMY_NOTARY)
+                signWith(MEGA_CORP_KEY)
+            }.toSignedTransaction()
+
+            services.recordTransactions(listOf(anotherTX))
+
+            services.vaultService.addNoteToTransaction(anotherTX.id, "GPB Sample Note 1")
+            assertEquals(2, services.vaultService.currentVault.transactionNotes.toList().size)
+            assertEquals(1, services.vaultService.getTransactionNotes(anotherTX.id).count())
         }
     }
 }