Mercurial > gemma
annotate pkg/imports/misc.go @ 4687:f73868037365
morphology: do correct clipping of classbreak heights based on z range of model.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Wed, 16 Oct 2019 13:02:08 +0200 |
parents | 51e90370eced |
children | 1d50ac8dd688 |
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1 // SPDX-License-Identifier: AGPL-3.0-or-later |
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2 // License-Filename: LICENSES/AGPL-3.0.txt |
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3 // |
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4 // Copyright (C) 2018 by via donau |
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5 // – Österreichische Wasserstraßen-Gesellschaft mbH |
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6 // Software engineering by Intevation GmbH |
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7 // |
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8 // Author(s): |
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9 // * Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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10 |
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11 package imports |
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12 |
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13 import ( |
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14 "context" |
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15 "database/sql" |
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16 "fmt" |
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17 "strings" |
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18 ) |
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19 |
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20 type stringCounter map[string]int |
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21 |
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22 func (sc stringCounter) String() string { |
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23 var b strings.Builder |
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24 for t, c := range sc { |
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25 if b.Len() > 0 { |
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26 b.WriteString(", ") |
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27 } |
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28 b.WriteString(fmt.Sprintf("%s: %d", t, c)) |
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29 } |
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30 return b.String() |
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31 } |
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32 |
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33 // Savepoint is a function wrapper to hide the details |
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34 // of managing database SAVEPOINTs. |
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35 // If the returned function is called with a callback |
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36 // the callback is run in a SAVEPOINT. |
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37 // If the callback returns w/o an error the SAVEPOINT |
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38 // is released. Otherwise the SAVEPOINT is rolled back. |
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39 func Savepoint( |
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40 ctx context.Context, |
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41 tx *sql.Tx, |
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42 name string, |
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43 ) func(func() error) error { |
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44 |
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45 var ( |
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46 savepoint = "SAVEPOINT " + name |
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47 rollback = "ROLLBACK TO SAVEPOINT " + name |
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48 release = "RELEASE SAVEPOINT " + name |
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49 ) |
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50 |
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51 return func(fn func() error) (err error) { |
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52 if _, err = tx.ExecContext(ctx, savepoint); err != nil { |
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53 return |
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54 } |
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55 var done bool |
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56 defer func() { |
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57 if !done { |
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58 _, err2 := tx.ExecContext(ctx, rollback) |
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59 if err == nil { |
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60 err = err2 |
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61 } |
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62 } |
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63 }() |
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64 if err = fn(); err == nil { |
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65 done = true |
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66 _, err = tx.ExecContext(ctx, release) |
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67 } |
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68 return |
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69 } |
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70 } |