org.sonar.process

Class ProcessCommands

java.lang.Object

org.sonar.process.ProcessCommands

public class ProcessCommands
extends Object

Process inter-communication to :

• share status of child process
• stop child process

It relies on files shared by both processes. Following alternatives were considered but not selected :

• JMX beans over RMI: network issues (mostly because of Java reverse-DNS) + requires to configure and open a new port
• simple socket protocol: same drawbacks are RMI connection
• java.lang.Process#destroy(): shutdown hooks are not executed on some OS (mostly MSWindows)
• execute OS-specific commands (for instance kill on *nix): OS-specific, so hell to support. Moreover how to get identify a process ?

Field Summary

Fields

Modifier and Type	Field and Description
static byte	EMPTY
static byte	READY
static byte	STOP

Constructor Summary

Constructors

Constructor and Description
ProcessCommands(File directory, int processNumber)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	askedForStop()
void	askForStop() To be executed by monitor process to ask for child process termination
void	endWatch()
long	getLastPing()
static int	getMaxProcesses()
boolean	isReady()
void	ping()
void	setReady() To be executed by child process to declare that it's ready

Methods inherited from class java.lang.Object

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

Field Detail

STOP

public static final byte STOP

See Also:

Constant Field Values

READY

public static final byte READY

See Also:

Constant Field Values

EMPTY

public static final byte EMPTY

See Also:

Constant Field Values

Constructor Detail

ProcessCommands

public ProcessCommands(File directory,
               int processNumber)

Method Detail

isReady

public boolean isReady()

setReady

public void setReady()

To be executed by child process to declare that it's ready

ping

public void ping()

getLastPing

public long getLastPing()

askForStop

public void askForStop()

To be executed by monitor process to ask for child process termination

askedForStop

public boolean askedForStop()

endWatch

public void endWatch()

getMaxProcesses

public static int getMaxProcesses()