mirror of https://gitee.com/bigwinds/arangodb
150 lines
4.5 KiB
C++
150 lines
4.5 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2018 ArangoDB GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_GENERAL_SERVER_LANE_H
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#define ARANGOD_GENERAL_SERVER_LANE_H 1
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#include "Basics/Common.h"
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namespace arangodb {
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class GeneralRequest;
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enum class RequestLane {
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// For requests that do not block or wait for something.
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// This ignores blocks that can occur when delivering
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// a file from, for example, an NFS mount.
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CLIENT_FAST,
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// For requests that execute an AQL query or are tightly
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// related like simple queries, but not V8 actions,
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// that do AQL requests, user administrator that
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// internally uses AQL.
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CLIENT_AQL,
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// For requests that are executed within a V8 context,
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// but not for requests that might use a V8 context for
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// user defined functions.
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CLIENT_V8,
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// For requests that might block or wait for something,
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// which are not CLIENT_AQL or CLIENT_V8.
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CLIENT_SLOW,
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// Used for all requests sent by the web UI
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CLIENT_UI,
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// For requests between agents. These are basically the
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// requests used to implement RAFT.
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AGENCY_INTERNAL,
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// For requests from the DBserver or Coordinator accessing
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// the agency.
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AGENCY_CLUSTER,
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// For requests from the DBserver to the Coordinator or
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// from the Coordinator to the DBserver. But not using
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// V8 or having high priority.
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CLUSTER_INTERNAL,
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// For requests from the DBserver to the Coordinator or
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// from the Coordinator to the DBserver. Using AQL
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// these have Medium priority.
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CLUSTER_AQL,
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// For requests from the from the Coordinator to the
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// DBserver using V8.
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CLUSTER_V8,
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// For requests from the DBserver to the Coordinator or
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// from the Coordinator to the DBserver for administration
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// or diagnostic purpose. Should not block.
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CLUSTER_ADMIN,
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// For requests used between leader and follower for
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// replication to compare the local states of data.
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SERVER_REPLICATION,
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// For requests used between leader and follower for
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// replication to go the final mile and get back to
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// in-sync mode (wal tailing)
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SERVER_REPLICATION_CATCHUP,
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// For periodic or one-off V8-based tasks executed by the
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// Scheduler.
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TASK_V8,
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// Internal tasks with low priority
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INTERNAL_LOW,
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// Not yet used:
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// For requests which go from the agency back to coordinators or
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// DBservers to report about changes in the agency. They are fast
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// and should have high prio. Will never block.
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// AGENCY_CALLBACK`
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};
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enum class RequestPriority {
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HIGH = 0,
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MED = 1,
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LOW = 2
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};
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inline RequestPriority PriorityRequestLane(RequestLane lane) {
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switch (lane) {
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case RequestLane::CLIENT_FAST:
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return RequestPriority::HIGH;
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case RequestLane::CLIENT_AQL:
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return RequestPriority::LOW;
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case RequestLane::CLIENT_V8:
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return RequestPriority::LOW;
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case RequestLane::CLIENT_SLOW:
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return RequestPriority::LOW;
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case RequestLane::AGENCY_INTERNAL:
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return RequestPriority::HIGH;
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case RequestLane::AGENCY_CLUSTER:
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return RequestPriority::LOW;
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case RequestLane::CLUSTER_INTERNAL:
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return RequestPriority::HIGH;
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case RequestLane::CLUSTER_AQL:
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return RequestPriority::MED;
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case RequestLane::CLUSTER_V8:
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return RequestPriority::LOW;
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case RequestLane::CLUSTER_ADMIN:
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return RequestPriority::LOW;
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case RequestLane::SERVER_REPLICATION_CATCHUP:
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return RequestPriority::MED;
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case RequestLane::SERVER_REPLICATION:
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return RequestPriority::LOW;
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case RequestLane::TASK_V8:
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return RequestPriority::LOW;
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case RequestLane::INTERNAL_LOW:
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return RequestPriority::LOW;
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case RequestLane::CLIENT_UI:
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return RequestPriority::HIGH;
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}
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return RequestPriority::LOW;
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}
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} // namespace arangodb
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#endif
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