/
document.rb
747 lines (622 loc) · 18.5 KB
/
document.rb
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
require 'document/validations'
require 'document/virtualize'
require 'document/util'
require 'document/meta'
require 'document/associations'
require 'document/callback'
require 'document/coercions'
require 'document/delete'
require 'document/slot'
require 'document/versions'
module StrokeDB
# Slots which contain references to another documents are matched
# with these regexps.
DOCREF = /^@##{UUID_RE}$/
VERSIONREF = /^@##{UUID_RE}\.#{VERSION_RE}$/
#
# Raised on unexisting document access.
#
# Example:
#
# document.slot_that_does_not_exist_ever
#
class SlotNotFoundError < StandardError
attr_reader :slotname
def initialize(slotname)
@slotname = slotname
end
def message
"Can't find slot #{@slotname}"
end
def inspect
"#<#{self.class.name}: #{message}>"
end
end
#
# Raised when Document#save! is called on an invalid document
# (for which doc.valid? returns false)
#
class InvalidDocumentError < StandardError #:nodoc:
attr_reader :document
def initialize(document)
@document = document
end
def message
"Validation failed: #{@document.errors.messages.join(", ")}"
end
def inspect
"#<#{self.class.name}: #{message}>"
end
end
# Document is one of the core classes. It is being used to represent database document.
#
# Database document is an entity that:
#
# * is uniquely identified with UUID
# * has a number of slots, where each slot is a key-value pair (whereas pair could be a JSON object)
#
# Here is a simplistic example of document:
#
# <tt>1e3d02cc-0769-4bd8-9113-e033b246b013:</tt>
# name: "My Document"
# language: "English"
# authors: ["Yurii Rashkovskii","Oleg Andreev"]
#
class Document
include StrokeDB::Validations::InstanceMethods
attr_reader :callbacks #:nodoc:
def store
if (txns = Thread.current[:strokedb_transactions]) && !txns.nil? && !txns.empty?
txns.last
else
@store
end
end
def marshal_dump #:nodoc:
(@new ? '1' : '0') + (@saved ? '1' : '0') + to_raw.to_json
end
def marshal_load(content) #:nodoc:
@callbacks = {}
initialize_raw_slots(JSON.parse(content[2,content.length]))
@saved = content[1,1] == '1'
@new = content[0,1] == '1'
end
# Collection of meta documents
class Metas < Array #:nodoc:
def initialize(document)
@document = document
_meta = document[:meta]
concat [_meta].flatten.compact.map{|v| v.is_a?(DocumentReferenceValue) ? v.load : v}
end
def <<(meta)
add_meta(meta, :call_initialization_callbacks => true)
end
alias :_delete :delete
def delete(meta)
case meta
when Document
_delete meta
_module = StrokeDB::Document.collect_meta_modules(@document.store, meta).first
when Meta
_delete meta.document(@document.store)
_module = meta
else
raise ArgumentError, "Meta should be either document or meta module"
end
@document[:meta] = self
if _module
@document.unextend(_module)
end
end
def add_meta(meta, opts = {})
opts = opts.stringify_keys
_module = nil
# meta can be specified both as a meta document and as a module
case meta
when Document
push meta
_module = StrokeDB::Document.collect_meta_modules(@document.store, meta).first
when Meta
push meta.document(@document.store)
_module = meta
else
raise ArgumentError, "Meta should be either document or meta module"
end
# register meta in the document
@document[:meta] = self
if _module
@document.extend(_module)
_module.send!(:setup_callbacks, @document) rescue nil
if opts['call_initialization_callbacks']
@document.send!(:execute_callbacks_for, _module, :on_initialization)
@document.send!(:execute_callbacks_for, _module, :on_new_document) if @document.new?
end
end
end
end
#
# Instantiates new document with given arguments (which are the same as in Document#new),
# and saves it right away
#
def self.create!(*args, &block)
new(*args, &block).save!
end
#
# Instantiates new document
#
# Here are few ways to call it:
#
# Document.new(:slot_1 => slot_1_value, :slot_2 => slot_2_value)
#
# This way new document with slots <tt>slot_1</tt> and <tt>slot_2</tt> will be initialized in the
# default store.
#
# Document.new(store,:slot_1 => slot_1_value, :slot_2 => slot_2_value)
#
# This way new document with slots <tt>slot_1</tt> and <tt>slot_2</tt> will be initialized in the
# given <tt>store</tt>.
#
# Document.new({:slot_1 => slot_1_value, :slot_2 => slot_2_value},uuid)
#
# where <tt>uuid</tt> is a string with UUID. *WARNING*: this way of initializing Document should not
# be used unless you know what are you doing!
#
def initialize(*args, &block)
@initialization_block = block
if args.first.is_a?(Hash) || args.empty?
raise NoDefaultStoreError unless StrokeDB.default_store
do_initialize(StrokeDB.default_store, *args)
else
do_initialize(*args)
end
end
#
# Get slot value by its name:
#
# document[:slot_1]
#
# If slot was not found, it will return <tt>nil</tt>
#
def [](slotname)
@slots[slotname.to_s].value rescue nil
end
#
# Set slot value by its name:
#
# document[:slot_1] = "some value"
#
def []=(slotname, value)
slotname = slotname.to_s
(@slots[slotname] ||= Slot.new(self, slotname)).value = value
update_version!(slotname)
value
end
#
# Checks slot presence. Unlike Document#slotnames it allows you to find even 'virtual slots' that could be
# computed runtime by associations or <tt>when_slot_found</tt> callbacks
#
# document.has_slot?(:slotname)
#
def has_slot?(slotname)
v = send(slotname)
(v.nil? && slotnames.include?(slotname.to_s)) ? true : !!v
rescue SlotNotFoundError
false
end
#
# Removes slot
#
# document.remove_slot!(:slotname)
#
def remove_slot!(slotname)
slotname = slotname.to_s
@slots.delete slotname
update_version! slotname
nil
end
#
# Returns an <tt>Array</tt> of explicitely defined slots
#
# document.slotnames #=> ["version","name","language","authors"]
#
def slotnames
@slots.keys
end
#
# Creates Diff document from <tt>from</tt> document to this document
#
# document.diff(original_document) #=> #<StrokeDB::Diff added_slots: {"b"=>2}, from: #<Doc a: 1>, removed_slots: {"a"=>1}, to: #<Doc b: 2>, updated_slots: {}>
#
def diff(from)
Diff.new(store, :from => from, :to => self)
end
def pretty_print #:nodoc:
slots = to_raw.except('meta')
s = is_a?(ImmutableDocument) ? "#<(imm)" : "#<"
Util.catch_circular_reference(self) do
if self[:meta] && name = meta[:name]
s << "#{name} "
else
s << "Doc "
end
slots.keys.sort.each do |k|
if %w(version previous_version).member?(k) && v = self[k]
s << "#{k}: #{v[0,4]}..., "
else
s << "#{k}: #{self[k].inspect}, "
end
end
s.chomp!(', ')
s.chomp!(' ')
s << ">"
end
s
rescue Util::CircularReferenceCondition
"#(#{(self[:meta] ? "#{meta}" : "Doc")} #{('@#'+uuid)[0,5]}...)"
end
alias :to_s :pretty_print
alias :inspect :pretty_print
#
# Returns string with Document's JSON representation
#
def to_json
to_raw.to_json
end
#
# Returns string with Document's XML representation
#
def to_xml(opts = {})
to_raw.to_xml({ :root => 'document', :dasherize => true }.merge(opts))
end
#
# Primary serialization
#
def to_raw #:nodoc:
raw_slots = {}
@slots.each_pair do |k,v|
raw_slots[k.to_s] = v.to_raw
end
raw_slots
end
def to_optimized_raw #:nodoc:
__reference__
end
#
# Creates a document from a serialized representation
#
def self.from_raw(store, raw_slots, opts = {}) #:nodoc:
doc = new(store, raw_slots, true)
collect_meta_modules(store, raw_slots['meta']).each do |meta_module|
unless doc.is_a? meta_module
doc.extend(meta_module)
meta_module.send!(:setup_callbacks, doc) rescue nil
end
end
unless opts[:skip_callbacks]
doc.send! :execute_callbacks, :on_initialization
doc.send! :execute_callbacks, :on_load
end
doc
end
#
# Find document(s) by:
#
# a) UUID
#
# Document.find(uuid)
#
# b) search query
#
# Document.find(:slot => "value")
#
# If first argument is Store, that particular store will be used; otherwise default store will be assumed.
def self.find(*args)
store = nil
if (txns = Thread.current[:strokedb_transactions]) && !txns.nil? && !txns.empty?
store = txns.last
else
if args.empty? || args.first.is_a?(String) || args.first.is_a?(Hash) || args.first.nil?
store = StrokeDB.default_store
else
store = args.shift
end
end
raise NoDefaultStoreError.new unless store
query = args.first
case query
when UUID_RE
store.find(query)
when Hash
store.search(query)
else
raise ArgumentError, "use UUID or query to find document(s)"
end
end
#
# Reloads head of the same document from store. All unsaved changes will be lost!
#
def reload
new? ? self : store.find(uuid)
end
#
# Returns <tt>true</tt> if this is a document that has never been saved.
#
def new?
!!@new
end
#
# Returns <tt>true</tt> if this document is a latest version of document being saved to a respective
# store
#
def head?
return false if new? || is_a?(VersionedDocument)
store.head_version(uuid) == version
end
#
# Saves the document. If validations do not pass, InvalidDocumentError
# exception is raised.
#
def save!(perform_validation = true)
execute_callbacks :before_save
if perform_validation
raise InvalidDocumentError.new(self) unless valid?
end
execute_callbacks :after_validation
store.save!(self)
@new = false
@saved = true
execute_callbacks :after_save
self
end
# Updates slots with a specified <tt>hash</tt> and returns itself.
def update_slots(hash)
hash.each do |k, v|
self[k] = v
end
self
end
# Same as update_slots, but also saves the document.
def update_slots!(hash)
update_slots(hash).save!
end
# Updates nil/false slots with a specified <tt>hash</tt> and returns itself.
# Already set slots are not modified (<tt>||=</tt> is used).
# Acts like <tt>hash1.reverse_merge(hash2)</tt> (<tt>hash2.merge(hash1)</tt>).
#
def reverse_update_slots(hash)
hash.each do |k, v|
self[k] ||= v
end
self
end
# Same as reverse_update_slots, but also saves the document.
def reverse_update_slots!(hash)
reverse_update_slots(hash).save!
end
#
# Returns document's metadocument (if any). In case if document has more than one metadocument,
# it will combine all metadocuments into one 'virtual' metadocument
#
def meta
unless (m = self[:meta]).kind_of? Array
# simple case
return m || Document.new(@store)
end
return m.first if m.size == 1
mm = m.clone
collected_meta = mm.shift.clone
names = collected_meta[:name].split(',') rescue []
mm.each do |next_meta|
next_meta = next_meta.clone
collected_meta += next_meta
names << next_meta.name if next_meta[:name]
end
collected_meta.name = names.uniq.join(',')
collected_meta.make_immutable!
end
#
# Instantiate a composite document
#
def +(document)
original, target = [to_raw, document.to_raw].map{ |raw| raw.except(*%w(uuid version previous_version)) }
Document.new(@store, original.merge(target).merge(:uuid => Util.random_uuid), true)
end
#
# Should be used to add metadocuments on the fly:
#
# document.metas << Buyer
# document.metas << Buyer.document
#
# Please not that it accept both meta modules and their documents, there is no difference
#
def metas
@metas ||= Metas.new(self)
end
#
# Returns document's version (which is stored in <tt>version</tt> slot)
#
def version
self[:version]
end
#
# Return document's uuid
#
def uuid
@uuid ||= self[:uuid]
end
def raw_uuid #:nodoc:
@raw_uuid ||= uuid.to_raw_uuid
end
#
# Returns document's previous version (which is stored in <tt>previous_version</tt> slot)
#
def previous_version
self[:previous_version]
end
def version=(v) #:nodoc:
self[:version] = v
end
#
# Returns an instance of Document::Versions
#
def versions
@versions ||= Versions.new(self)
end
def __reference__ #:nodoc:
"@##{uuid}.#{version}"
end
def ==(doc) #:nodoc:
case doc
when Document, DocumentReferenceValue
doc = doc.load if doc.kind_of? DocumentReferenceValue
# we make a quick UUID check here to skip two heavy to_raw calls
doc.uuid == uuid && doc.to_raw == to_raw
else
false
end
end
def eql?(doc) #:nodoc:
self == doc
end
# documents are hashed by their UUID
def hash #:nodoc:
uuid.hash
end
def make_immutable!
extend ImmutableDocument
self
end
def mutable?
true
end
def method_missing(sym, *args) #:nodoc:
sym = sym.to_s
return send(:[]=, sym.chomp('='), *args) if sym.ends_with? '='
return self[sym] if slotnames.include? sym
return !!send(sym.chomp('?'), *args) if sym.ends_with? '?'
raise SlotNotFoundError.new(sym) if (callbacks['when_slot_not_found'] || []).empty?
r = execute_callbacks(:when_slot_not_found, sym)
raise r if r.is_a? SlotNotFoundError # TODO: spec this behavior
r
end
def add_callback(cbk) #:nodoc:
name, uid = cbk.name, cbk.uid
callbacks[name] ||= []
# if uid is specified, previous callback with the same uid is deleted
if uid && old_cb = callbacks[name].find{ |cb| cb.uid == uid }
callbacks[name].delete old_cb
end
callbacks[name] << cbk
end
protected
# value of the last called callback is returned when executing callbacks
# (or nil if none found)
def execute_callbacks(name, *args) #:nodoc:
(callbacks[name.to_s] || []).inject(nil) do |prev_value, callback|
callback.call(self, *args)
end
end
def execute_callbacks_for(origin, name, *args) #:nodoc:
(callbacks[name.to_s] || []).inject(nil) do |prev_value, callback|
callback.origin == origin ? callback.call(self, *args) : prev_value
end
end
# initialize the document. initialize_raw is true when
# document is initialized from a raw serialized form
def do_initialize(store, slots={}, initialize_raw = false) #:nodoc:
@callbacks = {}
@store = store
if initialize_raw
initialize_raw_slots slots
@saved = true
else
@new = true
initialize_slots slots
self[:uuid] = Util.random_uuid unless self[:uuid]
self[:version] ||= NIL_UUID
end
end
# initialize slots for a new, just created document
def initialize_slots(slots) #:nodoc:
@slots = {}
slots = slots.stringify_keys
# there is a reason for meta slot is initialized separately —
# we need to setup coercions before initializing actual slots
if meta = slots['meta']
meta = [meta] unless meta.is_a?(Array)
meta.each {|m| metas.add_meta(m) }
end
slots.except('meta').each {|name,value| self[name] = value }
# now, when we have all slots initialized, we can run initialization callbacks
execute_callbacks :on_initialization
execute_callbacks :on_new_document
end
# initialize slots from a raw representation
def initialize_raw_slots(slots) #:nodoc:
@slots = {}
slots.each do |name,value|
s = Slot.new(self, name)
s.raw_value = value
@slots[name.to_s] = s
end
end
# returns an array of meta modules (as constants) for a given something
# (a document reference, a document itself, or an array of the former)
def self.collect_meta_modules(store, meta) #:nodoc:
meta_names = []
case meta
when VERSIONREF
if m = store.find($1, $2)
mod = Module.find_by_nsurl(m[:nsurl])
mod = nil if mod == Module
meta_names << (mod ? mod.name : "") + "::" + m[:name]
end
when DOCREF
if m = store.find($1)
mod = Module.find_by_nsurl(m[:nsurl])
mod = nil if mod == Module
meta_names << (mod ? mod.name : "") + "::" + m[:name]
end
when Array
meta_names = meta.map { |m| collect_meta_modules(store, m) }.flatten
when Document
meta_names << meta[:name]
end
meta_names.map { |m| m.is_a?(String) ? (m.constantize rescue nil) : m }.compact
end
def generate_new_version!
self.version = Util.random_uuid
end
def update_version!(slotname)
if @saved && slotname != 'version' && slotname != 'previous_version'
self[:previous_version] = version unless version.nil?
generate_new_version!
@saved = nil
end
end
end
#
# VersionedDocument is a module that is being added to all document's of specific version.
# It should not be accessed directly
#
module VersionedDocument
#
# Reloads the same version of the same document from store. All unsaved changes will be lost!
#
def reload
store.find(uuid, version)
end
end
#
# ImmutableDocument can't be saved
# It should not be used directly, use Document#make_immutable! instead
#
module ImmutableDocument
def mutable?
false
end
def save!
self
end
end
end