ridljar/com/sun/star/lib/connections/websocket/WebsocketConnection.java |   35 
+++-------
 1 file changed, 11 insertions(+), 24 deletions(-)

New commits:
commit da558946bec0f052fd6f3815faf859b69262a2b0
Author:     Caolán McNamara <caolan.mcnam...@collabora.com>
AuthorDate: Tue Sep 5 13:03:41 2023 +0100
Commit:     Caolán McNamara <caolan.mcnam...@collabora.com>
CommitDate: Tue Sep 5 16:02:56 2023 +0200

    websocket URP flush hangs with large buffer
    
    over 4k hits limit so flush waits until something reads, but the
    read is in the same thread after the flush.
    
    We are just using _outputStream to accumulate the bytes to be send
    so change this to use a ByteArrayOutputStream and take over its bytes
    and clear it when we flush.
    
    Change-Id: I17b90e1c7d4302f153b5832e60ac0e0f2b86ace9
    Reviewed-on: https://gerrit.libreoffice.org/c/core/+/156565
    Tested-by: Jenkins
    Reviewed-by: Caolán McNamara <caolan.mcnam...@collabora.com>

diff --git 
a/ridljar/com/sun/star/lib/connections/websocket/WebsocketConnection.java 
b/ridljar/com/sun/star/lib/connections/websocket/WebsocketConnection.java
index a3aed227c81d..fb81c4ff8801 100644
--- a/ridljar/com/sun/star/lib/connections/websocket/WebsocketConnection.java
+++ b/ridljar/com/sun/star/lib/connections/websocket/WebsocketConnection.java
@@ -20,7 +20,7 @@ package com.sun.star.lib.connections.websocket;
 
 
 import java.io.BufferedInputStream;
-import java.io.BufferedOutputStream;
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -61,10 +61,8 @@ public class WebsocketConnection extends WebSocketClient 
implements XConnection,
 
     protected String       _description;
     protected InputStream  _inputStream;
-    protected OutputStream _outputStream;
-
-    protected InputStream _outputStreamReader;
     protected OutputStream _inputStreamWriter;
+    protected ByteArrayOutputStream _outputStream;
 
     protected ArrayList<XStreamListener>       _listeners;
 
@@ -83,14 +81,10 @@ public class WebsocketConnection extends WebSocketClient 
implements XConnection,
 
         PipedOutputStream inputStreamWriter = new PipedOutputStream();
         PipedInputStream inputPipe = new PipedInputStream(inputStreamWriter);
-        PipedOutputStream outputPipe = new PipedOutputStream();
-        PipedInputStream outputStreamReader = new PipedInputStream(outputPipe);
-
 
         _inputStream = new BufferedInputStream(inputPipe);
         _inputStreamWriter = inputStreamWriter;
-        _outputStream = new BufferedOutputStream(outputPipe);
-        _outputStreamReader = outputStreamReader;
+        _outputStream = new ByteArrayOutputStream();
 
         _listeners = new ArrayList<XStreamListener>();
 
@@ -206,23 +200,16 @@ public class WebsocketConnection extends WebSocketClient 
implements XConnection,
      */
     public void flush() throws com.sun.star.io.IOException,
         com.sun.star.uno.RuntimeException {
-        try {
-            _outputStream.flush();
-
-            Integer available = _outputStreamReader.available();
-
-            byte[] outputBytes = new byte[available + outgoingPrefix.length];
-            System.arraycopy(outgoingPrefix, 0, outputBytes, 0, 
outgoingPrefix.length);
-
-            _outputStreamReader.read(outputBytes, outgoingPrefix.length, 
available);
 
-            send(outputBytes);
-        } catch(IOException ioException) {
-            com.sun.star.io.IOException unoIOException = new 
com.sun.star.io.IOException(ioException);
-            notifyListeners_error(unoIOException);
-
-            throw unoIOException;
+        byte[] accumulatedBytes;
+        synchronized (_outputStream) {
+            accumulatedBytes = _outputStream.toByteArray();
+            _outputStream.reset();
         }
+        byte[] outputBytes = new byte[accumulatedBytes.length + 
outgoingPrefix.length];
+        System.arraycopy(outgoingPrefix, 0, outputBytes, 0, 
outgoingPrefix.length);
+        System.arraycopy(accumulatedBytes, 0, outputBytes, 
outgoingPrefix.length, accumulatedBytes.length);
+        send(outputBytes);
 
         if (DEBUG)
             System.err.println(String.format("##### %s - flushed", 
getClass().getName()));

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