Leomrlin commented on code in PR #716:
URL: https://github.com/apache/geaflow/pull/716#discussion_r2703126777


##########
geaflow-ai/src/main/java/org/apache/geaflow/ai/session/SessionManagement.java:
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@@ -0,0 +1,67 @@
+/*
+ * 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.geaflow.ai.session;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.geaflow.ai.common.config.Constants;
+import org.apache.geaflow.ai.subgraph.SubGraph;
+
+public class SessionManagement {
+
+    public static final SessionManagement INSTANCE = new SessionManagement();
+    private final Map<String, Long> session2ActiveTime = new HashMap<>();
+    private final Map<String, List<SubGraph>> session2Graphs = new HashMap<>();
+
+    private SessionManagement() {
+    }
+
+    public boolean createSession(String sessionId) {
+        if (session2ActiveTime.containsKey(sessionId)) {
+            return false;
+        }
+        session2ActiveTime.put(sessionId, System.nanoTime());
+        return true;
+    }
+
+    public String createSession() {
+        String sessionId = Constants.PREFIX_TMP_SESSION + System.nanoTime()
+                + UUID.randomUUID().toString().replace("-", "").substring(0, 
8);
+        if (createSession(sessionId)) {
+            return sessionId;
+        } else {
+            return null;
+        }
+    }
+
+    public boolean sessionExists(String session) {
+        return this.session2ActiveTime.containsKey(session);
+    }
+
+    public List<SubGraph> getSubGraph(String sessionId) {
+        return this.session2Graphs.get(sessionId);
+    }
+
+    public void setSubGraph(String sessionId, List<SubGraph> subGraphs) {
+        this.session2Graphs.put(sessionId, subGraphs);

Review Comment:
   An empty `SubGraph` list is created in `session2Graphs` when a session is 
created.



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