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Posted to pr@cassandra.apache.org by GitBox <gi...@apache.org> on 2022/01/25 03:52:39 UTC
[GitHub] [cassandra] yifan-c commented on a change in pull request #1421: CASSANDRA-17224: Virtual table for exposing CQL metrics
yifan-c commented on a change in pull request #1421:
URL: https://github.com/apache/cassandra/pull/1421#discussion_r791335829
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File path: src/java/org/apache/cassandra/db/virtual/CQLMetricsTable.java
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@@ -0,0 +1,87 @@
+/*
+ * 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.db.virtual;
+
+import com.google.common.annotations.VisibleForTesting;
+
+import org.apache.cassandra.db.marshal.DoubleType;
+import org.apache.cassandra.db.marshal.UTF8Type;
+import org.apache.cassandra.dht.LocalPartitioner;
+import org.apache.cassandra.metrics.CQLMetrics;
+import org.apache.cassandra.schema.TableMetadata;
+import org.apache.cassandra.cql3.QueryProcessor;
+
+// Virtual table for CQL metrics
+public class CQLMetricsTable extends AbstractVirtualTable
+{
+ public static final String TABLE_NAME = "cql_metrics";
+ public static final String PREPARED_STATEMENTS_COUNT_COL = "prepared_statements_count";
+ public static final String PREPARED_STATEMENTS_EVICTED_COL = "prepared_statements_evicted";
+ public static final String PREPARED_STATEMENTS_EXECUTED_COL = "prepared_statements_executed";
+ public static final String PREPARED_STATEMENTS_RATIO_COL = "prepared_statements_ratio";
+ public static final String REGULAR_STATEMENTS_EXECUTED_COL = "regular_statements_executed";
+ public static final String NAME_COL = "name";
+ public static final String VALUE_ROW = "value";
+
+ private final CQLMetrics cqlMetrics;
Review comment:
I think it is used to inject the test `CQLMetrics` object for testing.
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