boglesby commented on a change in pull request #5246:
URL: https://github.com/apache/geode/pull/5246#discussion_r441207166



##########
File path: 
extensions/geode-modules/src/main/java/org/apache/geode/modules/session/catalina/AbstractCommitSessionValve.java
##########
@@ -0,0 +1,86 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+package org.apache.geode.modules.session.catalina;
+
+import static org.apache.geode.util.internal.UncheckedUtils.uncheckedCast;
+
+import java.io.IOException;
+
+import javax.servlet.ServletException;
+
+import org.apache.catalina.Context;
+import org.apache.catalina.Manager;
+import org.apache.catalina.connector.Request;
+import org.apache.catalina.connector.Response;
+import org.apache.catalina.valves.ValveBase;
+import org.apache.juli.logging.Log;
+import org.apache.juli.logging.LogFactory;
+
+
+public abstract class AbstractCommitSessionValve<SelfT extends 
AbstractCommitSessionValve<?>>
+    extends ValveBase {
+
+  private static final Log log = 
LogFactory.getLog(AbstractCommitSessionValve.class);
+
+  protected static final String info =
+      "org.apache.geode.modules.session.catalina.CommitSessionValve/1.0";
+
+  AbstractCommitSessionValve() {
+    log.info("Initialized");
+  }
+
+  @Override
+  public void invoke(final Request request, final Response response)
+      throws IOException, ServletException {
+    // Invoke the next Valve
+    try {
+      getNext().invoke(request, wrapResponse(response));
+    } finally {
+      commitSession(request);
+    }
+  }
+
+  /**
+   * Commit session only if DeltaSessionManager is in place.
+   *
+   * @param request to commit session from.
+   */
+  protected static <SelfT extends AbstractCommitSessionValve<?>> void 
commitSession(
+      final Request request) {
+    final Context context = request.getContext();
+    final Manager manager = context.getManager();
+    if (manager instanceof DeltaSessionManager) {
+      final DeltaSessionFacade session = (DeltaSessionFacade) 
request.getSession(false);
+      if (session != null) {
+        final DeltaSessionManager<SelfT> deltaSessionManager = 
uncheckedCast(manager);
+        final Log contextLogger = context.getLogger();

Review comment:
       Can you change this to use the AbstractCommitSessionValve's Logger (the 
static log variable) instead of the Context's logger? I'm not sure why its like 
this, but if we use the AbstractCommitSessionValve's Logger, then only 1 line 
in logging.properties is necessary to debug this class rather than 2:
   ```
   org.apache.geode.modules.session.level = FINE
   ```




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