Leo Sutic wrote:
> > From: Robert Mouat [mailto:[EMAIL PROTECTED]]
> >
> > Leo Sutic wrote:
> >
> > > this is my understanding of the sort-of concensus we have arrived at.
> > > Some issues are still being debated, and I believe I have marked those
> > > as such.
> > <snip/>
> > > We've agreed on removing release() from the CM interface, and the rest
> > > of this sumary details how we get the same functionality without that
> > > method.
> > >
> > > We've agreed that all components returned from a CM are thread safe.
> >
> > I must have missed this (in my desire not to read any emails
> > containing "ROLE",hint vs. "ROLE/hint" :)... so I'm going to
> > ask: why must they be thread safe?
>
> Because they are looked up in compose() and then stays with the
> composer for the composer's lifetime. As there may be several threads
> in the composer accessing that component, it must be thread safe.
oops, looks like I confused threadsafe with singleton.
I think I understand this a little better now: interfaces that imply
a transaction also hint at non-threadsafety (i.e. prevent the
assumption of threadsafety)...
but, understanding that, is it a policy to discourage the use of the
ComponentManager outside of compose(), i.e. are the following bad:
private ComponentManager M_cm;
private TypeOneInterface m_type1;
public void compose( Component Manager cm )
{
m_cm = cm;
}
public void initialize()
{
m_type1 = (TypeOneInterface) m_cm.lookup( "TypeOneInterface" );
}
public void doStuff()
{
type2 = (TypeTwoInterface) m_cm.lookup( "TypeTwoInterface" );
type2.begin();
//...
type2.end();
}
or
private TypeTwoInterface m_type2;
public void begin()
{
m_type2 = (TypeTwoInterface) m_cm.lookup( "TypeTwoInterface" );
m_type2.begin();
}
public void foo()
{
m_type2.bar()
}
public void end()
{
m_type2.end();
m_type2 = null; // let the GC clean it up :)
}
why is it wrong for the composer you mention to not be threadsafe? and if
it declares itself non-threadsafe (or fails to decleare itself
threadsafe), how is it bad to use a non-threadsafe component over several
methods (as in the second example above)?
Robert.
P.S. apologies if this has been covered in a previous thread.
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