Mercurial > gemma
view pkg/imports/dst.go @ 5520:05db984d3db1
Improve performance of bottleneck area calculation
Avoid buffer calculations by replacing them with simple distance comparisons
and calculate the boundary of the result geometry only once per iteration.
In some edge cases with very large numbers of iterations, this reduced
the runtime of a bottleneck import by a factor of more than twenty.
author | Tom Gottfried <tom@intevation.de> |
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date | Thu, 21 Oct 2021 19:50:39 +0200 |
parents | 59a99655f34d |
children | 6270951dda28 |
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// This is Free Software under GNU Affero General Public License v >= 3.0 // without warranty, see README.md and license for details. // // SPDX-License-Identifier: AGPL-3.0-or-later // License-Filename: LICENSES/AGPL-3.0.txt // // Copyright (C) 2019 by via donau // – Österreichische Wasserstraßen-Gesellschaft mbH // Software engineering by Intevation GmbH // // Author(s): // * Sascha L. Teichmann <sascha.teichmann@intevation.de> // * Sascha Wilde <wilde@intevation.de> package imports import ( "context" "database/sql" "fmt" ) // DeleteStretch is a Job to delete a stretch from the database. type DeleteStretch struct { ID int64 `json:"id"` } // DSTJobKind is the import queue type identifier. const DSTJobKind JobKind = "dst" type dstJobCreator struct{} func init() { RegisterJobCreator(DSTJobKind, dstJobCreator{}) } func (dstJobCreator) Description() string { return "delete stretch" } func (dstJobCreator) AutoAccept() bool { return false } func (dstJobCreator) Create() Job { return new(DeleteStretch) } func (dstJobCreator) Depends() [2][]string { return [2][]string{{"stretches"}} } const ( dstExistsSQL = ` SELECT EXISTS ( SELECT 1 FROM users.stretches WHERE id = $1 AND staging_done) ` dstStageDoneSQL = ` DELETE FROM users.stretches WHERE id IN ( SELECT key from import.track_imports WHERE import_id = $1 AND deletion AND relation = 'users.stretches'::regclass)` ) // StageDone finally removes the stretch from the database. func (dstJobCreator) StageDone( ctx context.Context, tx *sql.Tx, id int64, _ Feedback, ) error { _, err := tx.ExecContext(ctx, dstStageDoneSQL, id) return err } // CleanUp of a stretch delete import is a NOP. func (*DeleteStretch) CleanUp() error { return nil } // Do prepares the deletion of the stretch. func (dst *DeleteStretch) Do( ctx context.Context, importID int64, conn *sql.Conn, feedback Feedback, ) (interface{}, error) { tx, err := conn.BeginTx(ctx, nil) if err != nil { return nil, err } defer tx.Rollback() var found bool if err := tx.QueryRowContext(ctx, dstExistsSQL, dst.ID).Scan(&found); err != nil { return nil, err } if !found { return nil, fmt.Errorf("no stretch with id %d found", dst.ID) } feedback.Info("Prepare deletion of stretch with id %d", dst.ID) if _, err := tx.ExecContext( ctx, trackImportDeletionSQL, importID, "users.stretches", dst.ID, true, ); err != nil { return nil, err } if err := tx.Commit(); err != nil { return nil, err } return dst, nil }