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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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
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  package org.apache.cassandra.db.virtual;
  
  import java.time.Instant;
  import java.util.Collections;
  import java.util.Date;
  import java.util.List;
  import java.util.Map;
  
  import com.google.common.collect.ImmutableList;
  import org.junit.After;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Test;
  
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.cql3.UntypedResultSet;
  import org.apache.cassandra.db.ColumnFamilyStore;
  import org.apache.cassandra.service.snapshot.SnapshotOptions;
  import org.apache.cassandra.service.snapshot.SnapshotManager;
  import org.apache.cassandra.service.snapshot.TableSnapshot;
  
  public class SnapshotsTableTest extends CQLTester
  {
      private static final String KS_NAME = "vts";
      private static final String SNAPSHOT_TTL = "snapshotTtl";
      private static final String SNAPSHOT_NO_TTL = "snapshotNoTtl";
      private static final String TTL = "4h";
  
      @Before
      public void before() throws Throwable
      {
          SnapshotsTable vtable = new SnapshotsTable(KS_NAME);
          VirtualKeyspaceRegistry.instance.register(new VirtualKeyspace(KS_NAME, ImmutableList.of(vtable)));
  
          createTable("CREATE TABLE %s (pk int, ck int, PRIMARY KEY (pk, ck))");
  
          for (int i = 0; i != 10; ++i)
              execute("INSERT INTO %s (pk, ck) VALUES (?, ?)", i, i);
  
          flush();
      }
  
      @After
      public void after()
      {
          SnapshotManager.instance.clearSnapshot(SNAPSHOT_NO_TTL, Collections.emptyMap(), KEYSPACE);
          SnapshotManager.instance.clearSnapshot(SNAPSHOT_TTL, Collections.emptyMap(), KEYSPACE);
          schemaChange(String.format("DROP TABLE %s", KEYSPACE + '.' + currentTable()));
      }
  
      private static Date toDate(Instant instant)
      {
          return new Date(instant.toEpochMilli());
      }
  
      private static TableSnapshot createSnapshot(String snapshotTtl, Map<String, String> options, ColumnFamilyStore cfs)
      {
          List<TableSnapshot> snapshots = SnapshotManager.instance.takeSnapshot(SnapshotOptions.userSnapshot(snapshotTtl, options, cfs.getKeyspaceTableName()));
          Assert.assertEquals(1, snapshots.size());
          return snapshots.iterator().next();
      }
  
      @Test
      public void testSnapshots()
      {
          ColumnFamilyStore cfs = getCurrentColumnFamilyStore(KEYSPACE);
          TableSnapshot snapshotWithTtl = createSnapshot(SNAPSHOT_TTL, Map.of(SnapshotOptions.TTL, TTL), cfs);
          TableSnapshot snapshotWithoutTtl = createSnapshot(SNAPSHOT_NO_TTL, Collections.emptyMap(), cfs);
  
          // query all from snapshots virtual table
          UntypedResultSet result = execute("SELECT name, keyspace_name, table_name, created_at, expires_at, ephemeral FROM vts.snapshots");
          assertRowsIgnoringOrder(result,
                                  row(SNAPSHOT_NO_TTL, KEYSPACE, currentTable(), toDate(snapshotWithoutTtl.getCreatedAt()), null, false),
                                  row(SNAPSHOT_TTL, KEYSPACE, currentTable(), toDate(snapshotWithTtl.getCreatedAt()), toDate(snapshotWithTtl.getExpiresAt()), false));
  
          // query with conditions
          result = execute("SELECT name, keyspace_name, table_name, created_at, expires_at, ephemeral FROM vts.snapshots where ephemeral = false");
          assertRows(result,
                     row(SNAPSHOT_NO_TTL, KEYSPACE, currentTable(), toDate(snapshotWithoutTtl.getCreatedAt()), null, false),
                     row(SNAPSHOT_TTL, KEYSPACE, currentTable(), toDate(snapshotWithTtl.getCreatedAt()), toDate(snapshotWithTtl.getExpiresAt()), false));
  
          result = execute("SELECT name, keyspace_name, table_name, created_at, expires_at, ephemeral FROM vts.snapshots where size_on_disk > 1000");
          assertRows(result,
                     row(SNAPSHOT_NO_TTL, KEYSPACE, currentTable(), toDate(snapshotWithoutTtl.getCreatedAt()), null, false),
                     row(SNAPSHOT_TTL, KEYSPACE, currentTable(), toDate(snapshotWithTtl.getCreatedAt()), toDate(snapshotWithTtl.getExpiresAt()), false));
  
          result = execute("SELECT name, keyspace_name, table_name, created_at, expires_at, ephemeral FROM vts.snapshots where name = ?", SNAPSHOT_TTL);
          assertRows(result,
                     row(SNAPSHOT_TTL, KEYSPACE, currentTable(), toDate(snapshotWithTtl.getCreatedAt()), toDate(snapshotWithTtl.getExpiresAt()), false));
  
          // clear some snapshots
          SnapshotManager.instance.clearSnapshot(SNAPSHOT_NO_TTL, Collections.emptyMap(), KEYSPACE);
  
          result = execute("SELECT name, keyspace_name, table_name, created_at, expires_at, ephemeral FROM vts.snapshots");
          assertRowsIgnoringOrder(result,
                                  row(SNAPSHOT_TTL, KEYSPACE, currentTable(), toDate(snapshotWithTtl.getCreatedAt()), toDate(snapshotWithTtl.getExpiresAt()), false));
      }
  }