andresbeckruiz commented on code in PR #339:
URL: https://github.com/apache/cassandra-sidecar/pull/339#discussion_r3157403624


##########
server/src/main/java/org/apache/cassandra/sidecar/db/schema/ActiveClusterOpsSchema.java:
##########
@@ -0,0 +1,113 @@
+/*
+ * 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.cassandra.sidecar.db.schema;
+
+import com.datastax.driver.core.PreparedStatement;
+import com.datastax.driver.core.Session;
+import 
org.apache.cassandra.sidecar.common.server.utils.SecondBoundConfiguration;
+import org.apache.cassandra.sidecar.config.SchemaKeyspaceConfiguration;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Schema for the {@code active_cluster_ops} table, which tracks active 
operations
+ * and provides mutual exclusion via lightweight transactions (LWT).
+ */
+public class ActiveClusterOpsSchema extends TableSchema
+{
+    private static final String TABLE_NAME = "active_cluster_ops";
+
+    private final SchemaKeyspaceConfiguration keyspaceConfig;
+    private final SecondBoundConfiguration tableTtl;
+
+    private PreparedStatement trySetActive;
+    private PreparedStatement getActive;
+    private PreparedStatement getActiveByType;
+    private PreparedStatement clearActive;
+
+    public ActiveClusterOpsSchema(SchemaKeyspaceConfiguration keyspaceConfig, 
SecondBoundConfiguration tableTtl)
+    {
+        this.keyspaceConfig = keyspaceConfig;
+        this.tableTtl = tableTtl;
+    }
+
+    @Override
+    protected String keyspaceName()
+    {
+        return keyspaceConfig.keyspace();
+    }
+
+    @Override
+    protected String tableName()
+    {
+        return TABLE_NAME;
+    }
+
+    @Override
+    protected String createSchemaStatement()
+    {
+        return String.format("CREATE TABLE IF NOT EXISTS %s.%s (" +
+                             "  cluster_name text," +
+                             "  operation_type text," +
+                             "  operation_id uuid," +
+                             "  PRIMARY KEY ((cluster_name), operation_type)" +
+                             ") WITH default_time_to_live = %s",
+                             keyspaceConfig.keyspace(), TABLE_NAME, 
tableTtl.toSeconds());
+    }
+
+    @Override
+    protected void prepareStatements(@NotNull Session session)

Review Comment:
   Updated to use `CqlLiterals` inner class



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