/*
 * 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
 *
 *   https://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.accumulo.tserver.session;

import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.accumulo.core.data.Range;
import org.apache.accumulo.core.data.TableId;
import org.apache.accumulo.core.dataImpl.KeyExtent;
import org.apache.accumulo.core.dataImpl.thrift.MultiScanResult;
import org.apache.accumulo.core.securityImpl.thrift.TCredentials;
import org.apache.accumulo.tserver.scan.ScanParameters;

public class MultiScanSession extends ScanSession<MultiScanResult> {
  public final KeyExtent threadPoolExtent;
  public final Map<KeyExtent,List<Range>> queries;
  public final Set<KeyExtent> exents;

  // stats
  public int numRanges;
  public int numTablets;
  public int numEntries;
  public long totalLookupTime;

  public MultiScanSession(TCredentials credentials, KeyExtent threadPoolExtent,
      Map<KeyExtent,List<Range>> queries, ScanParameters scanParams,
      Map<String,String> executionHints, TabletResolver tabletResolver) {
    super(credentials, scanParams, executionHints, tabletResolver);
    this.queries = queries;
    this.threadPoolExtent = threadPoolExtent;
    this.exents = Set.copyOf(queries.keySet());
  }

  @Override
  public Type getScanType() {
    return Type.MULTI;
  }

  @Override
  public TableId getTableId() {
    return threadPoolExtent.tableId();
  }

  @Override
  public boolean cleanup() {
    // read volatile once to avoid race conditions
    var localScanTask = getScanTask();
    if (localScanTask != null) {
      localScanTask.cancel(true);
    }
    // the cancellation should provide us the safety to return true here
    return super.cleanup();
  }
}
