Revert broken fix and test (#12446)

The timeoutInterval variable needs to be part of per-UI state for the
code to work correctly. Storing it in a servlet-global MetadataWriter
instance is both semantically wrong and a race condition.

Also, the test currently throws NPE if assertions are enabled.

This reverts commit f595d057951523baf35a797692376dfa5de0bc8d.

Change-Id: Ia6d1383b2c112b86ce60c75a3ebb9f10da545d4a

2 files changed, 14 insertions, 23 deletions

diff --git a/server/src/com/vaadin/server/communication/UidlRequestHandler.java b/server/src/com/vaadin/server/communication/UidlRequestHandler.java
index f13199e9ae..d52c5e9fe0 100644
--- a/server/src/com/vaadin/server/communication/UidlRequestHandler.java
+++ b/server/src/com/vaadin/server/communication/UidlRequestHandler.java
@@ -56,7 +56,8 @@ public class UidlRequestHandler extends SynchronizedRequestHandler implements
 
     private ServerRpcHandler rpcHandler = new ServerRpcHandler();
 
-    private UidlWriter uidlWriter = new UidlWriter();
+    public UidlRequestHandler() {
+    }
 
     @Override
     public boolean synchronizedHandleRequest(VaadinSession session,
@@ -145,7 +146,7 @@ public class UidlRequestHandler extends SynchronizedRequestHandler implements
             JSONException {
         openJsonMessage(writer, response);
 
-        uidlWriter.write(ui, writer, repaintAll, false);
+        new UidlWriter().write(ui, writer, repaintAll, false);
 
         closeJsonMessage(writer);
     }
diff --git a/server/src/com/vaadin/server/communication/UidlWriter.java b/server/src/com/vaadin/server/communication/UidlWriter.java
index fe7a7d42bf..60933a75c2 100644
--- a/server/src/com/vaadin/server/communication/UidlWriter.java
+++ b/server/src/com/vaadin/server/communication/UidlWriter.java
@@ -51,14 +51,6 @@ import com.vaadin.ui.UI;
  */
 public class UidlWriter implements Serializable {
 
-    private LegacyUidlWriter legacyUidlWriter = new LegacyUidlWriter();
-    private SharedStateWriter sharedStateWriter = new SharedStateWriter();
-    private ConnectorTypeWriter connectorTypeWriter = new ConnectorTypeWriter();
-    private ConnectorHierarchyWriter connectorHierarchyWriter = new ConnectorHierarchyWriter();
-    private ClientRpcWriter clientRpcWriter = new ClientRpcWriter();
-    private MetadataWriter metadataWriter = new MetadataWriter();
-    private ResourceWriter resourceWriter = new ResourceWriter();
-
     /**
      * Writes a JSON object containing all pending changes to the given UI.
      * 
@@ -87,12 +79,13 @@ public class UidlWriter implements Serializable {
         // to write out
         session.getService().runPendingAccessTasks(session);
 
+        ArrayList<ClientConnector> dirtyVisibleConnectors = ui
+                .getConnectorTracker().getDirtyVisibleConnectors();
+        LegacyCommunicationManager manager = session.getCommunicationManager();
         // Paints components
+        ConnectorTracker uiConnectorTracker = ui.getConnectorTracker();
         getLogger().log(Level.FINE, "* Creating response to client");
 
-        ConnectorTracker uiConnectorTracker = ui.getConnectorTracker();
-        ArrayList<ClientConnector> dirtyVisibleConnectors = uiConnectorTracker
-                .getDirtyVisibleConnectors();
         getLogger().log(
                 Level.FINE,
                 "Found " + dirtyVisibleConnectors.size()
@@ -107,13 +100,10 @@ public class UidlWriter implements Serializable {
         try {
             writer.write("\"changes\" : ");
 
-            LegacyCommunicationManager manager = session
-                    .getCommunicationManager();
-
             JsonPaintTarget paintTarget = new JsonPaintTarget(manager, writer,
                     !repaintAll);
 
-            legacyUidlWriter.write(ui, writer, paintTarget);
+            new LegacyUidlWriter().write(ui, writer, paintTarget);
 
             paintTarget.close();
             writer.write(", "); // close changes
@@ -130,7 +120,7 @@ public class UidlWriter implements Serializable {
             // processing.
 
             writer.write("\"state\":");
-            sharedStateWriter.write(ui, writer);
+            new SharedStateWriter().write(ui, writer);
             writer.write(", "); // close states
 
             // TODO This should be optimized. The type only needs to be
@@ -139,7 +129,7 @@ public class UidlWriter implements Serializable {
             // widget mapping
 
             writer.write("\"types\":");
-            connectorTypeWriter.write(ui, writer, paintTarget);
+            new ConnectorTypeWriter().write(ui, writer, paintTarget);
             writer.write(", "); // close states
 
             // Send update hierarchy information to the client.
@@ -150,7 +140,7 @@ public class UidlWriter implements Serializable {
             // child to 0 children)
 
             writer.write("\"hierarchy\":");
-            connectorHierarchyWriter.write(ui, writer);
+            new ConnectorHierarchyWriter().write(ui, writer);
             writer.write(", "); // close hierarchy
 
             // send server to client RPC calls for components in the UI, in call
@@ -160,7 +150,7 @@ public class UidlWriter implements Serializable {
             // which they were performed, remove the calls from components
 
             writer.write("\"rpc\" : ");
-            clientRpcWriter.write(ui, writer);
+            new ClientRpcWriter().write(ui, writer);
             writer.write(", "); // close rpc
 
             uiConnectorTracker.markAllConnectorsClean();
@@ -170,11 +160,11 @@ public class UidlWriter implements Serializable {
             SystemMessages messages = ui.getSession().getService()
                     .getSystemMessages(ui.getLocale(), null);
             // TODO hilightedConnector
-            metadataWriter.write(ui, writer, repaintAll, async, messages);
+            new MetadataWriter().write(ui, writer, repaintAll, async, messages);
             writer.write(", ");
 
             writer.write("\"resources\" : ");
-            resourceWriter.write(ui, writer, paintTarget);
+            new ResourceWriter().write(ui, writer, paintTarget);
 
             Collection<Class<? extends ClientConnector>> usedClientConnectors = paintTarget
                     .getUsedClientConnectors();