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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 package datastore | |
6 | |
7 import ( | |
8 "golang.org/x/net/context" | |
9 ) | |
10 | |
11 // RunCB is the callback signature provided to Interface.Run | |
12 // | |
13 // - obj is an object as specified by the proto argument of Run | |
Vadim Sh.
2015/07/29 16:21:43
consider passing a struct
type PartialResult str
iannucci
2015/08/03 03:56:31
I tried this, but it's not really worth the extra
| |
14 // - getCursor can be invoked to obtain the current cursor. | |
15 // | |
16 // Return true to continue iterating through the query results, or false to stop . | |
17 type RunCB func(obj interface{}, getCursor func() (Cursor, error)) bool | |
18 | |
19 type Interface interface { | |
20 NewKey(kind, stringID string, intID int64, parent Key) Key | |
21 | |
22 // NewKeyObj extracts a key from src. | |
23 // | |
24 // If there's a probjem obtaining the key, this method will panic. | |
25 // | |
26 // src must be one of: | |
27 // - *S where S is a struct | |
Vadim Sh.
2015/07/29 16:21:43
struct tagged with meta-how-do-you-call-them tags?
iannucci
2015/08/03 03:56:32
Done.
| |
28 // - a PropertyLoadSaver | |
29 NewKeyObj(src interface{}) Key | |
30 | |
31 // NewKeyObjErr extracts a key from src. | |
32 // | |
33 // src must be one of: | |
34 // - *S where S is a struct | |
35 // - a PropertyLoadSaver | |
36 NewKeyObjErr(src interface{}) (Key, error) | |
37 | |
38 DecodeKey(encoded string) (Key, error) | |
Vadim Sh.
2015/07/29 16:21:43
document?
iannucci
2015/08/03 03:56:32
Done.
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39 NewQuery(kind string) Query | |
40 | |
41 RunInTransaction(f func(c context.Context) error, opts *TransactionOptio ns) error | |
42 | |
43 // Run executes the given query, and calls `cb` for each successfully it em. | |
Vadim Sh.
2015/07/29 16:21:43
typos: successfully item
iannucci
2015/08/03 03:56:32
Done.
| |
44 // | |
45 // proto is a prototype of the objects which will be passed to the callb ack. | |
Vadim Sh.
2015/07/29 16:21:43
It won't be written to, right?
iannucci
2015/08/03 03:56:32
correct. documented.
| |
46 // It must be of the form: | |
47 // - *S where S is a struct | |
48 // - *P where *P is a concrete type implementing PropertyLoadSaver | |
49 // - *Key implies a keys-only query (and cb will be invoked with Key's ) | |
50 // Run will create a new, populated instance of proto for each call of | |
51 // cb. Run stops on the first error encountered. | |
52 Run(q Query, proto interface{}, cb RunCB) error | |
53 | |
54 // GetAll retrieves all of the Query results into dst. | |
55 // | |
56 // dst must be one of: | |
57 // - *[]S or *[]*S where S is a struct | |
58 // - *[]P or *[]*P where *P is a concrete type implementing PropertyLo adSaver | |
59 // - *[]Key implies a keys-only query. | |
60 GetAll(q Query, dst interface{}) error | |
61 | |
62 // Get retrieves a single object from the datastore | |
63 // | |
64 // dst must be one of: | |
65 // - *S where S is a struct | |
66 // - *P where *P is a concrete type implementing PropertyLoadSaver | |
67 Get(dst interface{}) error | |
68 | |
69 // Put inserts a single object into the datastore | |
70 // | |
71 // src must be one of: | |
72 // - *S where S is a struct | |
73 // - *P where *P is a concrete type implementing PropertyLoadSaver | |
74 // | |
75 // If src resolves to an Incomplete key, Put will write the | |
Vadim Sh.
2015/07/29 16:21:43
its for autogenerating ids?
iannucci
2015/08/03 03:56:32
right. Incomplete specifically means `StringID ==
| |
76 // resolved key back to src. | |
77 Put(src interface{}) error | |
78 | |
79 // Delete removes an item from the datastore. | |
80 Delete(key Key) error | |
81 | |
82 // GetMulti retrieves items from the datastore. | |
83 // | |
84 // dst must be one of: | |
85 // - []S or []*S where S is a struct | |
86 // - []P or []*P where *P is a concrete type implementing PropertyLoad Saver | |
87 // - []I where I is some interface type. Each element of the slice mus t | |
88 // be non-nil, and its underlying type must be either *S o r *P. | |
89 GetMulti(dst interface{}) error | |
90 | |
91 // PutMulti writes items to the datastore. | |
92 // | |
93 // src must be one of: | |
94 // - []S or []*S where S is a struct | |
95 // - []P or []*P where *P is a concrete type implementing PropertyLoad Saver | |
96 // - []I where i is some interface type. Each elemet of the slice must | |
97 // be non-nil, and its underlying type must be either *S or *P. | |
98 // | |
99 // If items in src resolve to Incomplete keys, PutMulti will write the | |
100 // resolved keys back to the items in src. | |
101 PutMulti(src interface{}) error | |
102 | |
103 // DeleteMulti removes items from the datastore. | |
104 DeleteMulti(keys []Key) error | |
105 | |
106 // Raw returns the underlying RawInterface. The Interface and RawInterfa ce may | |
107 // be used interchangably; there's no danger of interleaving access to t he | |
108 // datastore via the two. | |
109 Raw() RawInterface | |
110 } | |
111 | |
112 // Get gets the Interface implementation from context. | |
113 func Get(c context.Context) Interface { | |
114 return &datastoreImpl{GetRaw(c)} | |
115 } | |
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