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.\" ========================================================================
.\"
.IX Title "UR::Service::RPC::Executer 3pm"
.TH UR::Service::RPC::Executer 3pm "2019-01-02" "perl v5.28.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
UR::Service::RPC::Executer \- Base class for modules implementing RPC executers
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This class is an abstract base class used to implement \s-1RPC\s0 executers.  That
is, modules meant to have their methods called from another process, and have
the results passed back to the original caller.  The communication happens
over a read-write filehandle such as a socket by passing UR::Service::RPC::Message
objects back and forth.
.PP
Executors are subordinate to a UR::Service::RPC::Server object which
handles decoding the message passed over the socket, calling the method
on the correct executor in the right context, and returning the result 
back through the file handle.
.SH "PROPERTIES"
.IX Header "PROPERTIES"
.IP "fh => IO::Handle" 4
.IX Item "fh => IO::Handle"
File handle messages are received on and responses are sent to
.IP "use_sigio => Boolean" 4
.IX Item "use_sigio => Boolean"
If true, the Server will set up a callback on the \s-1IO\s0 signal to handle
execution, so the Server does not need to block in \fBloop()\fR.
.SH "METHODS"
.IX Header "METHODS"
.IP "authenticate" 4
.IX Item "authenticate"
.Vb 1
\&  $bool = $exec\->authenticate($msg);
.Ve
.Sp
This is called by \fBexecute()\fR after the message object is deserialized from the
filehandle.  The default implementation just returns true.  Subclasses can
override this to examine the UR::Service::RPC::Message object and return 
true or fale whether it should allow or disallow execution.  If authentication
fails, the Executor should modify the Message object in-place with a proper
return value and exception.
.IP "execute" 4
.IX Item "execute"
.Vb 1
\&  $exec\->execute();
.Ve
.Sp
Called when the Server detects data is available to read on its file handle.
It deserializes the message and calls authenticate.  If authentication fails,
it immediately passes the message object back to the caller.
.Sp
If authentication succeeds, it calls the appropriate method in the Executor
package, and creates a new Message object with the return value to pass back
to the caller.
.IP "close_connection" 4
.IX Item "close_connection"
.Vb 1
\&  $exec\->close_connection();
.Ve
.Sp
Called by \fBexecute()\fR when it detects that the file handle has closed.
.PP
Derived classes should define additional methods that then become callable
by \fBexecute()\fR.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
UR::Service::RPC::Server, UR::Service::RPC::Message