From 3e1b04196196d8402387ed0dd4d25249f740fabb Mon Sep 17 00:00:00 2001
From: Edoardo La Greca
Date: Thu, 7 Aug 2025 19:11:14 +0200
Subject: implement flush

---
 src/main/kotlin/Connection.kt         | 17 +++++++++++++++--
 src/main/kotlin/ProtocolTranslator.kt |  5 ++++-
 2 files changed, 19 insertions(+), 3 deletions(-)

(limited to 'src/main')

diff --git a/src/main/kotlin/Connection.kt b/src/main/kotlin/Connection.kt
index a7de8cc..1cef2d3 100644
--- a/src/main/kotlin/Connection.kt
+++ b/src/main/kotlin/Connection.kt
@@ -110,8 +110,21 @@ class Connection(transLay: TransportLayer) : ProtocolTranslator {
         TODO("Not yet implemented")
     }
 
-    override fun flush() {
-        TODO("Not yet implemented")
+    override fun flush(oldtag: UShort): String? {
+        val omsg = OutMessage(NinePMessageType.TFLUSH, this.tagGen.generate(), listOf("oldtag"),
+            mapOf(
+                "oldtag" to BigInteger(oldtag.toString())
+            ),
+            emptyMap(),
+            emptyMap(),
+            this.maxSize
+        )
+        omsg.write(this.tl)
+        val checkErr = checkedInMessage(omsg.tag)
+        if (checkErr.first != null) {
+            return checkErr.first
+        }
+        return null
     }
 
     override fun attach(fid: UInt, afid: UInt, uname: String, aname: String): String? {
diff --git a/src/main/kotlin/ProtocolTranslator.kt b/src/main/kotlin/ProtocolTranslator.kt
index 4dad240..144eef6 100644
--- a/src/main/kotlin/ProtocolTranslator.kt
+++ b/src/main/kotlin/ProtocolTranslator.kt
@@ -38,8 +38,11 @@ interface ProtocolTranslator {
 
     /**
      * Abort a message.
+     *
+     * @param oldtag The tag of the message that needs to be purged.
+     * @return a possible error.
      */
-    fun flush()
+    fun flush(oldtag: UShort): String?
 
     /**
      * Establish a connection.
-- 
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