Databases
StackOverflow2013
Postsdbo
POIs it abusive to use IDisposable and "using" as a means for getting "scoped behavior" for exception safety?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POIs it abusive to use IDisposable and "using" as a means for getting "scoped behavior" for exception safety?
    primarykey
    data
    text
    <p>Something I often used back in C++ was letting a class <code>A</code> handle a state entry and exit condition for another class <code>B</code>, via the <code>A</code> constructor and destructor, to make sure that if something in that scope threw an exception, then B would have a known state when the scope was exited. This isn't pure RAII as far as the acronym goes, but it's an established pattern nevertheless.</p> <p>In C#, I often want to do</p> <pre><code>class FrobbleManager { ... private void FiddleTheFrobble() { this.Frobble.Unlock(); Foo(); // Can throw this.Frobble.Fiddle(); // Can throw Bar(); // Can throw this.Frobble.Lock(); } } </code></pre> <p>Which needs to be done like this</p> <pre><code>private void FiddleTheFrobble() { this.Frobble.Unlock(); try { Foo(); // Can throw this.Frobble.Fiddle(); // Can throw Bar(); // Can throw } finally { this.Frobble.Lock(); } } </code></pre> <p>if I want to guarantee the <code>Frobble</code> state when <code>FiddleTheFrobble</code> returns. The code would be nicer with</p> <pre><code>private void FiddleTheFrobble() { using (var janitor = new FrobbleJanitor(this.Frobble)) { Foo(); // Can throw this.Frobble.Fiddle(); // Can throw Bar(); // Can throw } } </code></pre> <p>where <code>FrobbleJanitor</code> looks <strong>roughly</strong> like</p> <pre><code>class FrobbleJanitor : IDisposable { private Frobble frobble; public FrobbleJanitor(Frobble frobble) { this.frobble = frobble; this.frobble.Unlock(); } public void Dispose() { this.frobble.Lock(); } } </code></pre> <p>And that's how I want to do it. Now reality catches up, since what I <strong>want</strong> to use <strong>requires</strong> that the <code>FrobbleJanitor</code> is used <strong>with</strong> <code>using</code>. I could consider this a code review issue, but something is nagging me.</p> <p><strong>Question:</strong> Would the above be considered as abusive use of <code>using</code> and <code>IDisposable</code>?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USJohann Gerell
    plurals
    1. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    3. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POIs it abusive to use IDisposable and "using" as a means for getting "scoped behavior" for exception safety?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POIs it abusive to use IDisposable and "using" as a means for getting "scoped behavior" for exception safety?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POIs it abusive to use IDisposable and "using" as a means for getting "scoped behavior" for exception safety?
      1. This table or related slice is empty.
      1. VTUpMod
    1. CO+1 for the class and method names alone :-). Well, to be fair, *and* the actual question.
      singulars
      1. POIs it abusive to use IDisposable and "using" as a means for getting "scoped behavior" for exception safety?
      1. USJoey
    2. CO@Johannes: Yeah, I can see why - most people just frobble their fiddle, but I just must protest against that. ;-) And, by the way, +1 for your name similarity.
      singulars
      1. POIs it abusive to use IDisposable and "using" as a means for getting "scoped behavior" for exception safety?
      1. USJohann Gerell
    3. CONice question, I learnt something new from it. Plus, I like your class and method names, too. :-D
      singulars
      1. POIs it abusive to use IDisposable and "using" as a means for getting "scoped behavior" for exception safety?
      1. USstakx
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload