Introduce Utils::Singleton class and
Utils::SingletonWithOptionalDependencies class template
that helps implementing singletons that depend on other
singletons. It's guaranteed that whenever singleton B depends
on singleton A, than A is always created before B is being
created, and that the order of destruction is always
opposite to the order of creation.
Dependencies of singleton are listed as template arguments
for SingletonWithOptionalDependencies class template.
The first argument of SingletonWithOptionalDependencies
class template is always a singleton class itself.
Prepare a common interface for all singleton subclasses:
SingletonSubClass *SingletonWithOptionalDependencies::instance();
Make instantiating singletons and its dependencies thread-safe.
Create singletons on demand (only if some code needs them).
It's not needed anymore to explicitly instantiate
all required singletons in tests.
Make it possible (and thread-safe) to instantiate ProcessReaper
and LauncherInterface singletons in non-main threads.
Make the following dependencies between existing singletons:
SshConnectionManager depends on:
-> LauncherInterface depends on:
-> ProcessReaper
Change-Id: Iefaacab561c2b3dcf07e7fafbb87339ea6a15278
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Make it possible to control when the SshProcessManager is
being constructed / destructed. Expose public constructor.
Since different singletons depend on each other, we need
to control the order of creation and destruction of them.
The order of creation is like that:
1. QCoreApplication
2. ProcessReaper
3. ProcessLauncher
4. SshConnectionManager
The order of destruction must be opposite to the above.
Change-Id: Ice07eb751cd61c03cb461816fa1b74ab040a53de
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
It used to be shared pointers so that existing connection objects could
easily be passed around in order not to open a new connection to the same
server. Since the introduction of the SshConnectionManager, this
is no longer necessary.
Change-Id: I13fd3eceaf35d562e6260e9969abbffb01edd6b5
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>
It does not belong into libUtils, which is a collection of small
unrelated utility classes.
Task-number: QTCREATORBUG-7218
Change-Id: Id92b9f28678afec93e6f07166adfde6550f38072
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>
