be/src/service/query-driver-map.cc

// 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.

#include "service/query-driver-map.h"

#include "gutil/strings/substitute.h"
#include "util/container-util.h"
#include "util/debug-util.h"
#include "util/uid-util.h"

#include "common/names.h"

namespace impala {

Status QueryDriverMap::AddQueryDriver(
    const TUniqueId& query_id, std::shared_ptr<QueryDriver> query_driver) {
  ScopedShardedMapRef<std::shared_ptr<QueryDriver>> map_ref(query_id, this);
  DCHECK(map_ref.get() != nullptr);

  auto entry = map_ref->find(query_id);
  if (entry != map_ref->end()) {
    // There shouldn't be an active query with that same id.
    // (query_id is globally unique)
    return Status(ErrorMsg(TErrorCode::INTERNAL_ERROR,
        strings::Substitute("query id $0 already exists", PrintId(query_id))));
  }
  map_ref->insert(make_pair(query_id, query_driver));
  return Status::OK();
}

Status QueryDriverMap::DeleteQueryDriver(const TUniqueId& query_id) {
  ScopedShardedMapRef<std::shared_ptr<QueryDriver>> map_ref(query_id, this);
  DCHECK(map_ref.get() != nullptr);
  auto entry = map_ref->find(query_id);
  if (entry == map_ref->end()) {
    Status err = Status::Expected(TErrorCode::INVALID_QUERY_HANDLE, PrintId(query_id));
    VLOG(1) << err.GetDetail();
    return err;
  }
  map_ref->erase(entry);
  return Status::OK();
}

} // namespace impala