com.peterphi.std.system.exec

Class BasicProcessTracker

java.lang.Object

com.peterphi.std.system.exec.BasicProcessTracker

public class BasicProcessTracker
extends Object

A basic process tracker that does not touch stdout/stderr streams

Field Summary

Fields

Modifier and Type	Field and Description
protected List<String>	cmd
protected boolean	combinedOutput
protected int	exitCode
protected boolean	finished
protected Process	process

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BasicProcessTracker(List<String> cmd, Process p, boolean combinedOutput)

Method Summary

Modifier and Type	Method and Description
protected Thread	copy(InputStream in, Writer out)
protected Thread	discard(InputStream in)
void	discardOutput() Indicates that the output of this process should be discarded
int	exitCode() Returns the exit code of the application, assuming it has already terminated.
protected void	finished(int exitCode)
Process	getProcess()
InputStream	getStandardErrorStream()
OutputStream	getStandardInputStream()
InputStream	getStandardOutputStream()
boolean	isFinished() Determines if the application has completed yet
protected boolean	isStillReadingOutput() Returns true if the output of this process is still being read
void	kill()
void	kill(boolean force)
protected void	unexpectedFailure(IOException e)
int	waitForExit() Wait an indefinite amount of time for the process to exit
int	waitForExit(Deadline deadline) Waits for the process to exit; this method blocks until the process has completed (at which point it returns the process exit code) or until deadline has elapsed, at which point it returns Integer.MIN_VALUE
int	waitForExit(Deadline deadline, int expected) Wait until deadline for the process to exit, expecting the return code to be expected.
int	waitForExit(int expected) Wait an indefinite amount of time for the process to exit, expecting the return code to be expected.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

cmd

protected final List<String> cmd

process

protected final Process process

combinedOutput

protected final boolean combinedOutput

finished

protected boolean finished

exitCode

protected int exitCode

Constructor Detail

BasicProcessTracker

protected BasicProcessTracker(List<String> cmd,
                              Process p,
                              boolean combinedOutput)

Method Detail

isStillReadingOutput

protected boolean isStillReadingOutput()

Returns true if the output of this process is still being read

Returns:

false if this instance is copying the stdout/stderr and they have been closed, otherwise true if we are still copying stdout/stderr. Always returns false if some external agent is handling the stdout/stderr streams.

discardOutput

public void discardOutput()

Indicates that the output of this process should be discarded

getProcess

public Process getProcess()

kill

public final void kill()

kill

public void kill(boolean force)

isFinished

public boolean isFinished()

Determines if the application has completed yet

Returns:

true if the process has terminated, otherwise false

exitCode

public int exitCode()
             throws IllegalThreadStateException

Returns the exit code of the application, assuming it has already terminated. If the process has not yet terminated then an IllegalStateException will be thrown

Returns:

the exit code of the process

Throws:

IllegalStateException - if the process has not yet terminated

IllegalThreadStateException

waitForExit

public int waitForExit(int expected)

Wait an indefinite amount of time for the process to exit, expecting the return code to be expected. If the output is not expected then a RuntimeException is thrown

Parameters:

expected - the expected return code

Returns:

the exit code of the process

Throws:

RuntimeException - if the return code was not what was expected

waitForExit

public int waitForExit(Deadline deadline,
                       int expected)

Wait until deadline for the process to exit, expecting the return code to be expected. If the output is not expected (or if the operation times out) then a RuntimeException is thrown
In the event of a timeout the process is not terminated

Parameters:

deadline -

expected -

Returns:

the exit code of the process

Throws:

RuntimeException - if a timeout occurrs or if the return code was not what was expected

waitForExit

public int waitForExit()

Wait an indefinite amount of time for the process to exit

Returns:

the exit code of the process

waitForExit

public int waitForExit(Deadline deadline)

Waits for the process to exit; this method blocks until the process has completed (at which point it returns the process exit code) or until deadline has elapsed, at which point it returns Integer.MIN_VALUE

Parameters:

deadline -

Returns:

the exit code of the process

getStandardOutputStream

public InputStream getStandardOutputStream()

getStandardErrorStream

public InputStream getStandardErrorStream()

getStandardInputStream

public OutputStream getStandardInputStream()

finished

protected void finished(int exitCode)

unexpectedFailure

protected void unexpectedFailure(IOException e)

copy

protected Thread copy(InputStream in,
                      Writer out)

discard

protected Thread discard(InputStream in)