Async::ContextSwitcher - helps track execution context in async programs
This is a very simple module that helps you carry around execution context in async programs.
Idea is simple:
you create a "new" context for an entry point
It can be a new web request, a new message from a queue to process or command line script command
use "cb_w_context" to create all callbacks in your application
correct context restored when your callbacks are called
use "context" to access data
Creates a new context and makes it the current one. Takes named pairs and stores them in the context.
Async::ContextSwitcher->new( request => $psgi_env );
Returns the current context. Function is exported. Always returns context.
my $ct = context->{request}{HTTP_CONTENT_TYPE}; context->{user} = $user;
Wrapper for callbacks. Function is exported. Wraps a callback with code that stores and restores context to make sure correct context travels with your code.
async_call( callback => cb_w_context { context->{good} = shift } );
Make sure that all callbacks in your code are created with this function or you can loose track of your context.
Ruslan Zakirov <Ruslan.Zakirov@gmail.com>
Under the same terms as perl itself.
To install Async::ContextSwitcher, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Async::ContextSwitcher
CPAN shell
perl -MCPAN -e shell install Async::ContextSwitcher
For more information on module installation, please visit the detailed CPAN module installation guide.