org.zeroturnaround.process

Class OrProcess

java.lang.Object

org.zeroturnaround.process.AbstractProcess

org.zeroturnaround.process.CompositeProcess

org.zeroturnaround.process.OrProcess

All Implemented Interfaces:

SystemProcess

public class OrProcess
extends CompositeProcess

Represents a single system process containing alternative SystemProcess implementations for controlling it. Children are expected to throw UnsupportedOperationException for certain operations.

For any operation we try each children until it doesn't throw UnsupportedOperationException. If all of them throw it, we throw it as well.

If it has only one child it acts the same as invoking the same method directly on the child.

Field Summary

Fields inherited from class org.zeroturnaround.process.CompositeProcess

children

Fields inherited from class org.zeroturnaround.process.AbstractProcess

log

Constructor Summary

Constructors

Constructor and Description
OrProcess(List<? extends SystemProcess> children)

Method Summary

Methods

Modifier and Type	Method and Description
void	destroy(boolean forceful) Destroys the process either forcefully or gracefully according to the given option.
boolean	isAlive() Tests whether this process is alive.
void	waitFor() Causes the current thread to wait, if necessary, until this process has terminated.

Methods inherited from class org.zeroturnaround.process.CompositeProcess

getDescription, invokeDestroy, toString

Methods inherited from class org.zeroturnaround.process.AbstractProcess

destroyForcefully, destroyGracefully, waitFor

Methods inherited from class java.lang.Object

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

Constructor Detail

OrProcess

public OrProcess(List<? extends SystemProcess> children)

Method Detail

isAlive

public boolean isAlive()
                throws IOException,
                       InterruptedException

Description copied from interface: SystemProcess

Tests whether this process is alive.

This operation may take some time to finish.

Returns:

true if this process is alive, false if it is finished or not found.

Throws:

IOException - on IO error.

InterruptedException - if interrupted.

waitFor

public void waitFor()
             throws InterruptedException

Description copied from interface: SystemProcess

Causes the current thread to wait, if necessary, until this process has terminated.

This method returns immediately if the process has already terminated. If the process has not yet terminated, the calling thread will be blocked until the process exits.

Throws:

InterruptedException - if interrupted.

destroy

public void destroy(boolean forceful)
             throws IOException,
                    InterruptedException

Description copied from class: AbstractProcess

Destroys the process either forcefully or gracefully according to the given option.

Note: The process may not terminate at all. i.e. isAlive() may return true for a any period after destroy() is called. This method may be chained to waitFor() if needed.

No error is thrown if the process was already terminated.

Specified by:

destroy in class AbstractProcess

Parameters:

forceful - true if the process must be destroyed forcefully (like kill -KILL), false if it must be destroyed gracefully (like kill -TERM).

Throws:

IOException - on IO error.

InterruptedException - if interrupted.