Thread safe observable collection
If you ever wrote something more, then standard UI input-output, you sure got into wide range of exceptions like “The calling thread cannot access this object because a different thread owns it” or “This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread”. What the problem? The problem is old like condom in my wallet world-old, the try to get into resources from different threads. Let me show you some code. Very-very bad code. It’s unbelievable, that this code can ever work.
void onAdd(object sender, RoutedEventArgs e) { new Thread(new ParameterizedThreadStart(addProc)).Start(Resources["source"] as MyCollection); } void onRem(object sender, RoutedEventArgs e) { new Thread(new ParameterizedThreadStart(remProc)).Start(Resources["source"] as MyCollection); } void onMov(object sender, RoutedEventArgs e) { new Thread(new ParameterizedThreadStart(movProc)).Start(Resources["source"] as MyCollection); }
<Window.Resources> <l:MyCollection x:Key="source"/> </Window.Resources> <StackPanel DataContext="{StaticResource source}"> <Button Click="onAdd">Add</Button> <Button Click="onMov">Move</Button> <Button Click="onRem">Remove</Button> <ListBox ItemsSource="{Binding}"/> </StackPanel>
Does not it looks scare? Such code might open unbelievable number of thread. Nothing will stay for it. But, wait. Let’s try to imagine, that we have a bunch of system methods, such as RAM queries, or kind of Amazon web service with million of transactions per second. Even very smart programmer will work with at least 10 threads to update the same collection. So, what to do?
Let’s write Thread Safe Observable Collection, that knows, that it might be called from big number of threads and take care on itself. Sounds good? Let’s start.
First of all we’ll try to get current STAThread (UI) dispatcher. How to do it? Simple. The only place we’ll initialize our collection is in XAML, so default constructor will be called from the thread we need. Now, we save it
Dispatcher _dispatcher; public ThreadSafeObservableCollection() { _dispatcher = Dispatcher.CurrentDispatcher; }
The next step is to override all vital methods of our collection to be invoked from this thread.
protected override void ClearItems() { if (_dispatcher.CheckAccess()) { base.ClearItems();} else { _dispatcher.Invoke(DispatcherPriority.DataBind, (SendOrPostCallback)delegate { Clear(); }); } }
Let’s understand it. First we’re checking if the current thread can access the instance of the object, if it can – we’ll just do our work, but if not, we’ll invoke it in the context of the current thread by sending anonymous delegate with or without parameters.
Why I’m casting the anonymous delegate into SendOrPostCallback? The answer is simple – look into Reflector. You can not implement your delegate with parameter and without return value better 
The next step is to take care on locking. We can use old Lock(object) method, but why to do it, if I can continue read my information, while someone writing it. Let’s use ReaderWriterLock. This class makes us able to write and read information concurrently, but still preventing us from writing things at the same simple. Due to the fact, that we are using this lock instance inside at one place we can use UpgradeToWriterLock and DowngradeFromWriterLock instead of real locking. Let’s see how to do it
protected override void InsertItem(int index, T item) { if (_dispatcher.CheckAccess()) { if (index > this.Count) return; LockCookie c = _lock.UpgradeToWriterLock(-1); base.InsertItem(index, item); _lock.DowngradeFromWriterLock(ref c); } else { object[] e = new object[] { index, item }; _dispatcher.Invoke(DispatcherPriority.DataBind, (SendOrPostCallback)delegate { InsertItemImpl(e); }, e); } } void InsertItemImpl(object[] e) { if (_dispatcher.CheckAccess()) { InsertItem((int)e[0], (T)e[1]); } else { _dispatcher.Invoke(DispatcherPriority.DataBind, (SendOrPostCallback)delegate { InsertItemImpl(e); }); } }
Sure, you have to initialize _lock = new ReaderWriterLock() in the constructor. Pay attention, that I’m using the same delegate even with two parameters. It still much better and faster, that write your own delegates for each type of action. Let the framework to do work for you.
After overwriting all vital methods for ObservableCollection, we’re actually, finished. Now, you can derive from your new class and perform the code at the beginning on the article very fast. The smart thread safe observable collection takes care on all the least.
Download and run following example, after playing a bit, check “Fast” checkbox and start pressing buttons as wide spirit. The application will work as requested.
April 22nd, 2007 · Comments (76)
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The plaintiff could also institute an actio furti (a actual movement) in state of affairs to amerce the defendant. If the thing could not be recovered, the plaintiff could affirm damages from the defendant with the comfort of the condictio furtiva (a personal action). With the help of the actio legis Aquiliae (a bodily action), the plaintiff could claim damages from the defendant. it is an deportment strictly on tap to owners solely,if you are a non owner you cannot ask beneath this model philosophy( you can hurt what you don’t have)
Rei vindicatio was derived from the ius civile, as a result was barely on tap to Roman citizens.
Contents
1 Specification of the fixation
2 Greek control on Roman legal concern
3 See also
4 Sources
Identifying of the thing
The duty of rei vindicatio remains the unmodified in most up to the minute statutory systems as it was in antique Rome. In any case, Roman law was much more express far the listing of the “utensil”. A plaintiff could not deliver won a event without specifying the mechanism in question.
At a theoretical up, Roman jurists identified three kinds of “junk”:
Corpus unitum
Corpus coniunctum
Corpus ex distantibus was not a single element, but a bundle of undecided things, such as a crush of cattle. Cattle were so portentous in Roman gentry that Roman jurists developed the balancing on cattle on a full scale. Corpus ex distantibus was the most disputed of the three.
Greek hold on Roman legitimate scheme
Two law schools in Rome, the Sabinian school and the Proculean circle, remained effectual from the tardy Republic in every part of the influential period. Most up to date Romanists consider these schools to be influenced to some spaciousness alongside Greek philosophy. They conjecture that the Sabinian boarding-school was the swot of Self-possession, while the Proculian train followed Aristotle or Peripateticism. Greek influence is markedly obvious in serious Roman rational on accession and specification. Sabinians, following Stoicism, argued that in these areas hyle supersedes eidos. Proculians countered that eidos is the decisive factor for the sake of a destruction of a thing.
Perceive also
Replevin
Trover
Detinue
Conversion (law)
Bailment
In rem
Bona fide purchaser
Sources
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Rei vindicatio
From Wikipedia, the unoccupied encyclopedia
Rei vindicatio is a authorized effect next to which the plaintiff demands that the defendant put in an appearance again a reaction that belongs to the plaintiff. It may no greater than be reach-me-down when plaintiff owns the matter, and the defendant is by fair means impeding the plaintiff’s possession of the thing. The an arrangement originated in obsolescent Rome.
The plaintiff could also institute an actio furti (a personal spirit) in request to punish the defendant. If the emotional attachment could not be recovered, the plaintiff could affirm damages from the defendant with the comfort of the condictio furtiva (a actual action). With the service of the actio legis Aquiliae (a in person vigour), the plaintiff could requisition damages from the defendant. it is an deportment strictly on tap to owners solely,if you are a non owner you cannot claim at the mercy of this standard( you can hurt what you don’t be struck by)
Rei vindicatio was derived from the ius civile, consequence was only available to Roman citizens.
Contents
1 Specification of the fixation
2 Greek control on Roman sound thought
3 The hang of also
4 Sources
Qualification of the item
The function of rei vindicatio remains the unvarying in most modern statutory systems as it was in fossilized Rome. Anyway, Roman law was much more particular wide the restriction of the “thing”. A plaintiff could not obtain won a event without specifying the point in question.
At a unproven flush, Roman jurists identified three kinds of “reaction”:
Corpus unitum
Corpus coniunctum
Corpus ex distantibus was not a single quirk, but a bundle of bold things, such as a horde of cattle. Bovines were so high-ranking in Roman society that Roman jurists developed the typical on beef on a complete scale. Corpus ex distantibus was the most disputed of the three.
Greek sway on Roman licit scheme
Two law schools in Rome, the Sabinian private school and the Proculean school, remained significant from the recent Republic throughout the classical period. Most newfangled Romanists take into account these schools to be influenced to some expanse by Greek philosophy. They bring to light that the Sabinian school was the swot of Coolness, while the Proculian train followed Aristotle or Peripateticism. Greek connections is extraordinarily express in classical Roman reasoning on accession and specification. Sabinians, following Resignation, argued that in these areas hyle supersedes eidos. Proculians countered that eidos is the decisive fact as a service to a fate of a thing.
About also
Replevin
Trover
Detinue
Conversion (law)
Bailment
In rem
Bona fide purchaser
Sources
A Study on the Whatchamacallit as the Reason of Rei Vindicatio: Seong, Dschung Mo
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On 16 November 2011 St. Petersburg Legislative Assembly passed in its first reading a law prohibiting propaganda of homosexuality, lesbianism, transsexuality and pedophilia and introducing fines for such actions. The law is expected to come into force in December 2011. Discussion of St. Petersburg law provoked intensive debates in the Russian media and society. According to its authors it will be used to ban any public events of sexual minorities in the city.
Speaker of Moscow City Duma Vladimir Platonov said in the interview that the law banning propaganda of homosexuality to minors will definitely be passed in Moscow. The next day he was supported by other local parliamentarians who said they are working on such a law to be introduced in Moscow City Duma.
On 17 November Speaker of Russian Upper Chamber of Parliament Valentina Matvienko supported introduction of a similar law on federal level.
http://www.youtube.com/watch?v=N3TOsbnSpyE
As seen in this video, the police cracked down very hard on dissent. Whether it is the representatives of the LGBT community or the opposition.
December 4, 2011 in Russia held elections to the Parliament. At stake were the 450 seats in the State Duma, the lower house of the Federal Assembly of Russia (the legislature). United Russia won the elections with a 49.54% share of votes (238 seats), down from 64.30% in the 2007 elections. The Communist Party of the Russian Federation received 19.16% (92 seats), while the Liberal Democratic Party of Russia got 11.66% (56 seats) and A Just Russia 13.22% (64 seats). Other parties did not cross the 7% election threshold.
According to the web sites, Mr. Putin’s party (or, as they call it Russians “party of crooks and thieves’), scored from 6 to 15% of the vote. Everything else – the results of fraud and massive violations of the election.
Left Front, Solidarity and other non-systemic opposition forces earlier said they had agreed with the authorities on a rally by 300 in Revolution Square on Saturday, 10 December. There is little doubt the promised 300 will be there – in the specially created groups on Facebook and VKontakte approximately 60 thousand have had themselves registered. Of these, about 35,000 vowed to go to the Moscow rally, said the radio station Ekho Moskvy. Another 8,000 said in Facebook that they “may come.” The registration is continuing.
Meanwhile, over the two previous days of protests the police set a record: they detained nearly one thousand. All are charged with disobeying police and jailed for a maximum of 15 days. All in all, since the date of the elections the number of detainees, according to media reports, has approached 1,200. Among the detainees there were several journalists who were at the rallies on assignment from their editorial boards.
Support for the protest action due Saturday has been expressed by the Russian federation of car owners. “On December 10 we are going to stage a motor procession in the center of Moscow and a rally in Revolution Square against election violations. We intend to support the action with our participation,” said the association’s leader Sergei Kanayev.
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Healthy and running hard, Bush happy to be big fish in Miami
DAVIE, Fla. — Under the hot August sun, when all his teammates understandably retreated to the locker room after practice, Dolphins running back Reggie Bush’s self-induced acclimation to South Florida would continue for at least 30 minutes.
He’d run 100-yard sprints on one of the team’s two practice fields, harnessed into a device designed to drag sets of weights on the ground behind him. When that was done, he’d slam a blocking sled. Then he’d catch dozens of passes that would spit from a machine.
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Bush never had to explain why he did it, everyday. You just knew: He had something to prove, something more to accomplish in a career defined by a strange acceptance in New Orleans that he was a nice weapon but not what so many initially hoped.
But what more exactly did he desire? Eclipsing 1,000 yards? Staying healthy in an expanded role? Serving as an every-down running back? These have long been our general assumptions — all true, too — but far from Bush’s master plan.
“I feel like there’s so much more,” Bush told me earlier this week, two days after surpassing 1,000 yards for the first time in his NFL career. “This is just the tip of the iceberg.”
When I asked Bush if he’s capable of winning an NFL rushing title, noting the task often requires well above 1,500 yards, he did not hesitate.
“Yes, I do,” he said. “No disrespect to anyone, but I’ve spent a lot of time studying different players, including Chris Johnson. I’ve watched a ton of his runs, especially during his 2,000-yard season. And yeah, I feel like I’m capable of a lot, but I’m not worrying about that yet. My mental focus is entirely on this next game. If I wasn’t, my priorities would be backward, and I wouldn’t be setting myself up to accomplish any of this.”
Just as it was fair to wonder, given his body of work with the Saints, whether Bush would accomplish as much as he has this season, his confidence moving forward is surely to be met with more skepticism. But after a generally quiet season — likely because of Miami’s lack of success — Bush has created a decent argument.
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Nobody with more than 200 attempts this year is averaging more yards per carry (5.0) than Bush. Only eight running backs have more carries than him. And his best work, which disputes concerns that he’d wear down too quickly, has occurred in three of his last four games, when he’s carried 20+ times.
“I knew it was just a matter of opportunity for me to get the chance to show that I can be an every-down back,” Bush said.
In Miami, under former coach Tony Sparano, he most certainly got that opportunity. Since the day Bush arrived in South Florida, Sparano spoke with conviction about his belief in the running back’s every-down potential, even in the face of criticism.
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“I really have a strong belief that this guy can carry the ball on first and second down,” he said on July 29, his first comments after the trade with New Orleans was completed.
This experiment is far from over, but it is off to an encouraging start, at least justifying to this point Bush’s decision to leave New Orleans in favor of exploring a new role. That decision wasn’t an easy one, causing Bush to reach out to a select group of advisors. Former Giants defensive end Michael Strahan was among them.
“I think he was genuinely conflicted,” Strahan said Tuesday. “I felt like he looked at it as a crossroad. It wasn’t financial. That didn’t seem like a concern. It was all about what he wanted to accomplish as a player — and whether he had to go somewhere else to do that.”
Strahan’s advice? You got the Super Bowl ring early in your career — now it’s time to chase other goals, whether 1,000 yards or a Pro Bowl or any grand plans that would require a more extensive role than the one designed for him with the Saints. Bush took the wisdom. And he ran with it.
“I remember saying, ‘If I don’t chase this opportunity now, I’ll never forgive myself for not trying,’” Bush said. “I had different goals. It wasn’t easy to leave, but at the end of the day, I’d rather chase this vision than to never have tried.”
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Bush’s late-season success could not have come at a better time. Had he not been able to quickly prove his worth as an every-down back in the first year of his two-year contract, there’s no telling what Miami’s next coach might have in mind for him.
This, after all, was the only place willing to take a shot on Bush as more than a speedy role player used mostly on third downs. He now has plenty of proof that might alter the opinions of many. It remains to be seen just how much success Bush can garner in the NFL — whether he truly can mold himself into a rushing champion. But after a season in which he proved, through intense preseason training and a level of conviction about his own ability that few others saw, it seems safe to at least say he earned himself a shot.
“I’ve always known it was within me,” Bush said. “I didn’t feel like I had to prove it to anyone. That’s the biggest factor in all of this: self-belief.
“Now, it’s just about making it happen.”
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