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Alarms as defined above are notifications about the state of the controlled property. Alarms are asynchronous and completely independent events. They have nothing to do with errors that occur during execution flow. In case such errors occur, the type and code values indicate this error condition, and the variable called error may contain a pointer to another completion structure. The particular values of the type and code are specific to the server implementation.
...
The
...
completion
...
structure
...
may
...
have
...
a
...
pointer
...
to
...
yet
...
another
...
completion,
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and
...
so
...
on.
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We
...
see
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that
...
all
...
those
...
completion
...
structures
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form
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a
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linked list in the recursive error sequence, which called error stack. Hence it is possible to return and analyze the full stack of errors in the method call sequence, as specified in \[3\].
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This
...
is
...
usually
...
done
...
by
...
the
...
ACS
...
libraries,
...
either
...
in
...
the
...
BACI
...
server
...
or
...
in
...
the
...
Abeans
...
\[5\]
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client
...
libraries.
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The
...
application
...
programmer
...
is
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relieved
...
from
...
this
...
work.
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We
...
will
...
therefore
...
not
...
go
...
into
...
details
...
here.
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If
...
the
...
Completion
...
type
...
and
...
code
...
indicate
...
an
...
error-free
...
condition,
...
the
...
error
...
stack
...
must
...
be
...
empty.
...
Errors
...
and
...
alarms
...
are
...
returned
...
through
...
the
...
completion
...
structure
...
and
...
not
...
via
...
CORBA
...
exceptions,
...
because
...
most
...
of
...
the
...
method
...
calls
...
are
...
asynchronous.
...
Callbacks,
...
which
...
are
...
executed
...
on
...
the
...
client
...
in
...
a
...
separate
...
thread,
...
cannot
...
raise
...
exceptions.
...
For
...
reasons
...
of
...
uniformity,
...
also
...
synchronously
...
executed
...
methods
...
that
...
deal
...
with
...
control
...
processes,
...
return
...
the
...
same
...
completion
...
structure.
...
If
...
methods
...
on
...
remote
...
objects
...
(either
...
Component
...
or
...
property)
...
fail
...
for
...
unexpected
...
reasons,
...
in
...
particular
...
methods
...
that
...
do
...
not
...
even
...
return
...
a
...
completion,
...
such
...
as
...
calls
...
to
...
characteristics
...
or
...
invocation
...
of
...
monitors,
...
then,
...
and
...
only
...
then,
...
exceptions
...
are
...
thrown.
...
If
...
the
...
remote
...
object
...
can
...
not
...
be
...
reached,
...
then
...
the
...
local
...
ORB
...
raises
...
a
...
CORBA::NO_IMPLEMENT
...
exception.
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If
...
the
...
remote
...
object
...
can
...
not
...
finish
...
the
...
request
...
for
...
whatever
...
reason,
...
it
...
raises
...
CORBA::NO_RESOURCES.
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These
...
exceptions
...
are
...
unchecked,
...
i.e.
...
they
...
are
...
not
...
predeclared
...
in
...
the
...
signature
...
of
...
the
...
method
...
in
...
the
...
IDL
...
file.
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