Package hudson.slaves

Class ComputerLauncher

java.lang.Object

hudson.model.AbstractDescribableImpl<ComputerLauncher>

hudson.slaves.ComputerLauncher

All Implemented Interfaces:

ExtensionPoint, Describable<ComputerLauncher>

Direct Known Subclasses:

ComputerLauncherFilter, DelegatingComputerLauncher, JNLPLauncher

public abstract class ComputerLauncher
extends AbstractDescribableImpl<ComputerLauncher>
implements ExtensionPoint

Extension point to allow control over how Computers are "launched", meaning how they get connected to their agent program.

Associated View

main.jelly

This page will be rendered into the top page of the computer (/computer/NAME/) Useful for showing launch related commands and status reports.

Since:

1.216-ish

Author:

Stephen Connolly

See Also:

• ComputerConnector

Nested Class Summary

Nested classes/interfaces inherited from interface hudson.ExtensionPoint

ExtensionPoint.LegacyInstancesAreScopedToHudson

Field Summary

Fields

Modifier and Type	Field	Description
static final DescriptorList<ComputerLauncher>	LIST	Deprecated. as of 1.281 Use Extension for registration, and use Jenkins.getDescriptorList(Class) for read access.

Constructor Summary

Constructors

Constructor	Description
ComputerLauncher()

Method Summary

Modifier and Type	Method	Description
void	afterDisconnect(SlaveComputer computer, TaskListener listener)	Allows the ComputerLauncher to tidy-up after a disconnect.
void	afterDisconnect(SlaveComputer computer, StreamTaskListener listener)	Deprecated. as of 1.304 Use afterDisconnect(SlaveComputer, TaskListener)
void	beforeDisconnect(SlaveComputer computer, TaskListener listener)	Allows the ComputerLauncher to prepare for a disconnect.
void	beforeDisconnect(SlaveComputer computer, StreamTaskListener listener)	Deprecated. as of 1.304 Use beforeDisconnect(SlaveComputer, TaskListener)
protected static void	checkJavaVersion(PrintStream logger, String javaCommand, BufferedReader r)	Given the output of "java -version" in r, determine if this version of Java is supported, or throw IOException.
boolean	isLaunchSupported()	Returns true if this ComputerLauncher supports programmatic launch of the agent in the target Computer.
void	launch(SlaveComputer computer, TaskListener listener)	Launches the agent for the given Computer.
void	launch(SlaveComputer computer, StreamTaskListener listener)	Deprecated. as of 1.304 Use launch(SlaveComputer, TaskListener)

Methods inherited from class hudson.model.AbstractDescribableImpl

getDescriptor

Methods inherited from class java.lang.Object

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

Field Details

LIST

@Deprecated
public static final DescriptorList<ComputerLauncher> LIST

Deprecated.

as of 1.281 Use Extension for registration, and use Jenkins.getDescriptorList(Class) for read access.

All registered ComputerLauncher implementations.

Constructor Details

ComputerLauncher

public ComputerLauncher()

Method Details

isLaunchSupported

public boolean isLaunchSupported()

Returns true if this ComputerLauncher supports programmatic launch of the agent in the target Computer.

launch

public void launch(SlaveComputer computer,
 TaskListener listener)
            throws IOException,
InterruptedException

Launches the agent for the given Computer.

If the agent is launched successfully, SlaveComputer.setChannel(InputStream, OutputStream, TaskListener, Channel.Listener) should be invoked in the end to notify Hudson of the established connection. The operation could also fail, in which case there's no need to make any callback notification, (except to notify the user of the failure through StreamTaskListener.) Also note that the normal return of this method call does not necessarily signify a successful launch. If someone programmatically calls this method and wants to find out if the launch was a success, use Computer.isOnline() at the end.

This method must operate synchronously. Asynchrony is provided by Computer.connect(boolean) and its correct operation depends on this.

Parameters:

listener - The progress of the launch, as well as any error, should be sent to this listener.

Throws:

IOException - if the method throws an IOException or InterruptedException, the launch was considered a failure and the stack trace is reported into the listener. This handling is just so that the implementation of this method doesn't have to diligently catch those exceptions.

InterruptedException

launch

@Deprecated
public void launch(SlaveComputer computer,
 StreamTaskListener listener)
            throws IOException,
InterruptedException

Deprecated.

as of 1.304 Use launch(SlaveComputer, TaskListener)

Throws:

IOException

InterruptedException

afterDisconnect

public void afterDisconnect(SlaveComputer computer,
 TaskListener listener)

Allows the ComputerLauncher to tidy-up after a disconnect.

This method is invoked after the Channel to this computer is terminated.

Disconnect operation is performed asynchronously, so there's no guarantee that the corresponding SlaveComputer exists for the duration of the operation.

afterDisconnect

@Deprecated
public void afterDisconnect(SlaveComputer computer,
 StreamTaskListener listener)

Deprecated.

as of 1.304 Use afterDisconnect(SlaveComputer, TaskListener)

beforeDisconnect

public void beforeDisconnect(SlaveComputer computer,
 TaskListener listener)

Allows the ComputerLauncher to prepare for a disconnect.

This method is invoked before the Channel to this computer is terminated, thus the channel is still accessible from SlaveComputer.getChannel(). If the channel is terminated unexpectedly, this method will not be invoked, as the channel is already gone.

Disconnect operation is performed asynchronously, so there's no guarantee that the corresponding SlaveComputer exists for the duration of the operation.

beforeDisconnect

@Deprecated
public void beforeDisconnect(SlaveComputer computer,
 StreamTaskListener listener)

Deprecated.

as of 1.304 Use beforeDisconnect(SlaveComputer, TaskListener)

checkJavaVersion

protected static void checkJavaVersion(PrintStream logger,
 String javaCommand,
 BufferedReader r)
                                throws IOException

Given the output of "java -version" in r, determine if this version of Java is supported, or throw IOException.

Parameters:

logger - where to log the output

javaCommand - the command executed, used for logging

r - the output of "java -version"

Throws:

IOException