Package hudson.slaves

Class NodeProperty<N extends Node>

java.lang.Object

hudson.slaves.NodeProperty<N>

Type Parameters:

N - NodeProperty can choose to only work with a certain subtype of Node, and this 'N' represents that type. Also see PropertyDescriptor.isApplicable(Class).

All Implemented Interfaces:

ExtensionPoint, Describable<NodeProperty<?>>, ReconfigurableDescribable<NodeProperty<?>>

Direct Known Subclasses:

DiskSpaceMonitorNodeProperty, EnvironmentVariablesNodeProperty, ToolLocationNodeProperty

public abstract class NodeProperty<N extends Node>
extends Object
implements ReconfigurableDescribable<NodeProperty<?>>, ExtensionPoint

Extensible property of Node.

Plugins can contribute this extension point to add additional data to Node. NodePropertys show up in the configuration screen of a node, and they are persisted with the Node object.

To add UI action to Nodes, i.e. a new link shown in the left side menu on a node page (./computer/<a node>), see instead TransientComputerActionFactory.

Views

config.jelly

Added to the configuration page of the node.

global.jelly

Added to the system configuration page.

summary.jelly (optional)

Added to the index page of the Computer associated with the node

Since:

1.286

Nested Class Summary

Nested classes/interfaces inherited from interface hudson.ExtensionPoint

ExtensionPoint.LegacyInstancesAreScopedToHudson

Field Summary

Fields

Modifier and Type	Field	Description
protected N	node

Constructor Summary

Constructors

Constructor	Description
NodeProperty()

Method Summary

Modifier and Type	Method	Description
static DescriptorExtensionList<NodeProperty<?>,NodePropertyDescriptor>	all()	Lists up all the registered NodeDescriptors in the system.
void	buildEnvVars(EnvVars env, TaskListener listener)	Creates environment variable override for launching child processes in this node.
CauseOfBlockage	canTake(Queue.BuildableItem item)	Called by the Node to help determine whether or not it should take the given task.
CauseOfBlockage	canTake(Queue.Task task)	Deprecated. as of 1.413 Use canTake(Queue.BuildableItem)
static List<NodePropertyDescriptor>	for_(Node node)	List up all NodePropertyDescriptors that are applicable for the given project.
NodePropertyDescriptor	getDescriptor()	Gets the descriptor for this instance.
NodeProperty<?>	reconfigure(org.kohsuke.stapler.StaplerRequest req, net.sf.json.JSONObject form)	When a parent/owner object of a Describable gets a config form submission and instances are recreated, this method is invoked on the existing instance (meaning the 'this' reference points to the existing instance) to create a new instance to be added to the parent/owner object.
protected void	setNode(N node)
Environment	setUp(AbstractBuild build, Launcher launcher, BuildListener listener)	Runs before the SCM.checkout(AbstractBuild, Launcher, FilePath, BuildListener, File) runs, and performs a set up.

Methods inherited from class java.lang.Object

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

Field Detail

node

protected transient N extends Node node

Constructor Detail

NodeProperty

public NodeProperty()

Method Detail

setNode

protected void setNode(N node)

getDescriptor

public NodePropertyDescriptor getDescriptor()

Description copied from interface: Describable

Gets the descriptor for this instance.

Descriptor is a singleton for every concrete Describable implementation, so if a.getClass() == b.getClass() then by default a.getDescriptor() == b.getDescriptor() as well. (In rare cases a single implementation class may be used for instances with distinct descriptors.)

Specified by:

getDescriptor in interface Describable<N extends Node>

canTake

@Deprecated
public CauseOfBlockage canTake(Queue.Task task)

Deprecated.

as of 1.413 Use canTake(Queue.BuildableItem)

Called by the Node to help determine whether or not it should take the given task. Individual properties can return a non-null value here if there is some reason the given task should not be run on its associated node. By default, this method returns null.

Since:

1.360

canTake

public CauseOfBlockage canTake(Queue.BuildableItem item)

Called by the Node to help determine whether or not it should take the given task. Individual properties can return a non-null value here if there is some reason the given task should not be run on its associated node. By default, this method returns null.

Since:

1.413

setUp

public Environment setUp(AbstractBuild build,
                         Launcher launcher,
                         BuildListener listener)
                  throws IOException,
                         InterruptedException

Runs before the SCM.checkout(AbstractBuild, Launcher, FilePath, BuildListener, File) runs, and performs a set up. Can contribute additional properties to the environment.

Parameters:

build - The build in progress for which an Environment object is created. Never null.

launcher - This launcher can be used to launch processes for this build. If the build runs remotely, launcher will also run a job on that remote machine. Never null.

listener - Can be used to send any message.

Returns:

non-null if the build can continue, null if there was an error and the build needs to be aborted.

Throws:

IOException - terminates the build abnormally. Hudson will handle the exception and reports a nice error message.

InterruptedException

buildEnvVars

public void buildEnvVars(@NonNull
                         EnvVars env,
                         @NonNull
                         TaskListener listener)
                  throws IOException,
                         InterruptedException

Creates environment variable override for launching child processes in this node.

Whereas setUp(AbstractBuild, Launcher, BuildListener) is used specifically for executing builds, this method is used for other process launch activities that happens outside the context of a build, such as polling, one time action (tagging, deployment, etc.)

Starting 1.489, this method and setUp(AbstractBuild, Launcher, BuildListener) are layered properly. That is, for launching processes for a build, this method is called first and then Environment.buildEnvVars(Map) will be added on top. This allows implementations to put node-scoped environment variables here, then build scoped variables to setUp(AbstractBuild, Launcher, BuildListener).

Unfortunately, Jenkins core earlier than 1.488 only calls setUp(AbstractBuild, Launcher, BuildListener), so if the backward compatibility with these earlier versions is important, implementations should invoke this method from Environment.buildEnvVars(Map).

Parameters:

env - Manipulate this variable (normally by adding more entries.) Note that this is an override, so it doesn't contain environment variables that are currently set for the agent process itself.

listener - Can be used to send messages.

Throws:

IOException

InterruptedException

Since:

1.489

reconfigure

public NodeProperty<?> reconfigure(org.kohsuke.stapler.StaplerRequest req,
                                   net.sf.json.JSONObject form)
                            throws Descriptor.FormException

Description copied from interface: ReconfigurableDescribable

When a parent/owner object of a Describable gets a config form submission and instances are recreated, this method is invoked on the existing instance (meaning the 'this' reference points to the existing instance) to create a new instance to be added to the parent/owner object.

The default implementation of this should be the following:

 return form==null ? null : getDescriptor().newInstance(req, form);
 

Specified by:

reconfigure in interface ReconfigurableDescribable<N extends Node>

Parameters:

req - The current HTTP request being processed.

form - JSON fragment that corresponds to this describable object. If the newly submitted form doesn't include a fragment for this describable (meaning the user has de-selected your descriptor), then this argument is null.

Returns:

The new instance. To not to create an instance of a describable, return null.

Throws:

Descriptor.FormException

all

public static DescriptorExtensionList<NodeProperty<?>,NodePropertyDescriptor> all()

Lists up all the registered NodeDescriptors in the system.

for_

public static List<NodePropertyDescriptor> for_(Node node)

List up all NodePropertyDescriptors that are applicable for the given project.