Package hudson.scm

Class NullSCM

java.lang.Object

hudson.scm.SCM

hudson.scm.NullSCM

All Implemented Interfaces:

ExtensionPoint, Describable<SCM>

public class NullSCM
extends SCM

No SCM.

Author:

Kohsuke Kawaguchi

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	NullSCM.DescriptorImpl

Nested classes/interfaces inherited from interface hudson.ExtensionPoint

ExtensionPoint.LegacyInstancesAreScopedToHudson

Field Summary

Fields inherited from class hudson.scm.SCM

PERMISSIONS, TAG

Constructor Summary

Constructors

Constructor	Description
NullSCM()

Method Summary

Modifier and Type	Method	Description
SCMRevisionState	calcRevisionsFromBuild(Run<?,?> build, FilePath workspace, Launcher launcher, TaskListener listener)	Calculates the SCMRevisionState that represents the state of the workspace of the given build.
void	checkout(Run<?,?> build, Launcher launcher, FilePath workspace, TaskListener listener, File changelogFile, SCMRevisionState baseline)	Obtains a fresh workspace of the module(s) into the specified directory of the specified machine.
PollingResult	compareRemoteRevisionWith(Job<?,?> project, Launcher launcher, FilePath workspace, TaskListener listener, SCMRevisionState baseline)	Compares the current state of the remote repository against the given baseline SCMRevisionState.
ChangeLogParser	createChangeLogParser()	The returned object will be used to parse changelog.xml.

Methods inherited from class hudson.scm.SCM

_calcRevisionsFromBuild, _for, _for, all, buildEnvironment, buildEnvVars, calcRevisionsFromBuild, checkout, compareRemoteRevisionWith, createEmptyChangeLog, createEmptyChangeLog, getApi, getBrowser, getDescriptor, getEffectiveBrowser, getKey, getModuleRoot, getModuleRoot, getModuleRoots, getModuleRoots, getType, guessBrowser, nullify, poll, pollChanges, postCheckout, postCheckout, processWorkspaceBeforeDeletion, processWorkspaceBeforeDeletion, requiresWorkspaceForPolling, supportsPolling

Methods inherited from class java.lang.Object

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

Constructor Details

NullSCM

@DataBoundConstructor
public NullSCM()

Method Details

calcRevisionsFromBuild

public SCMRevisionState calcRevisionsFromBuild(Run<?,?> build,
 FilePath workspace,
 Launcher launcher,
 TaskListener listener)
                                        throws IOException,
InterruptedException

Description copied from class: SCM

Calculates the SCMRevisionState that represents the state of the workspace of the given build.

The returned object is then fed into the SCM.compareRemoteRevisionWith(AbstractProject, Launcher, FilePath, TaskListener, SCMRevisionState) method as the baseline SCMRevisionState to determine if the build is necessary.

This method is called after source code is checked out for the given build (that is, after SCM.checkout(Run, Launcher, FilePath, TaskListener, File, SCMRevisionState) has finished successfully.)

The obtained object is added to the build as an Action for later retrieval. As an optimization, SCM implementation can choose to compute SCMRevisionState and add it as an action during check out, in which case this method will not called.

Overrides:

calcRevisionsFromBuild in class SCM

Parameters:

build - The calculated SCMRevisionState is for the files checked out in this build. If SCM.requiresWorkspaceForPolling() returns true, Hudson makes sure that the workspace of this build is available and accessible by the callee.

workspace - the location of the checkout; normally not null, since this will normally be called immediately after checkout, though could be null if data is being loaded from a very old version of Jenkins and the SCM declares that it does not require a workspace for polling

launcher - Abstraction of the machine where the polling will take place. Nullness matches that of workspace.

listener - Logs during the polling should be sent here.

Throws:

InterruptedException - interruption is usually caused by the user aborting the computation. this exception should be simply propagated all the way up.

IOException

compareRemoteRevisionWith

public PollingResult compareRemoteRevisionWith(Job<?,?> project,
 Launcher launcher,
 FilePath workspace,
 TaskListener listener,
 SCMRevisionState baseline)
                                        throws IOException,
InterruptedException

Description copied from class: SCM

Compares the current state of the remote repository against the given baseline SCMRevisionState.

Conceptually, the act of polling is to take two states of the repository and to compare them to see if there's any difference. In practice, however, comparing two arbitrary repository states is an expensive operation, so in this abstraction, we chose to mix (1) the act of building up a repository state and (2) the act of comparing it with the earlier state, so that SCM implementations can implement this more easily.

Multiple invocations of this method may happen over time to make sure that the remote repository is "quiet" before Hudson schedules a new build.

Overrides:

compareRemoteRevisionWith in class SCM

Parameters:

project - The project to check for updates

launcher - Abstraction of the machine where the polling will take place. If SCM declares that the polling doesn't require a workspace, this parameter is null.

workspace - The workspace directory that contains baseline files. If SCM declares that the polling doesn't require a workspace, this parameter is null.

listener - Logs during the polling should be sent here.

baseline - The baseline of the comparison. This object is the return value from earlier SCM.compareRemoteRevisionWith(AbstractProject, Launcher, FilePath, TaskListener, SCMRevisionState) or SCM.calcRevisionsFromBuild(AbstractBuild, Launcher, TaskListener).

Returns:

This method returns multiple values that are bundled together into the PollingResult value type. PollingResult.baseline should be the value of the baseline parameter, PollingResult.remote is the current state of the remote repository (this object only needs to be understandable to the future invocations of this method), and PollingResult.change that indicates the degree of changes found during the comparison.

Throws:

InterruptedException - interruption is usually caused by the user aborting the computation. this exception should be simply propagated all the way up.

IOException

checkout

public void checkout(Run<?,?> build,
 Launcher launcher,
 FilePath workspace,
 TaskListener listener,
 File changelogFile,
 SCMRevisionState baseline)
              throws IOException,
InterruptedException

Description copied from class: SCM

Obtains a fresh workspace of the module(s) into the specified directory of the specified machine.

The "update" operation can be performed instead of a fresh checkout if feasible.

This operation should also capture the information necessary to tag the workspace later.

Overrides:

checkout in class SCM

launcher - Abstracts away the machine that the files will be checked out.

workspace - a directory to check out the source code. May contain left-over from the previous build.

changelogFile - Upon a successful return, this file should capture the changelog. When there's no change, this file should contain an empty entry. See SCM.createEmptyChangeLog(File, TaskListener, String). May be null, in which case no changelog was requested.

baseline - version from the previous build to use for changelog creation, if requested and available

Throws:

AbortException - in case of a routine failure

InterruptedException - interruption is usually caused by the user aborting the build. this exception will cause the build to be aborted.

IOException

createChangeLogParser

public ChangeLogParser createChangeLogParser()

Description copied from class: SCM

The returned object will be used to parse changelog.xml.

Specified by:

createChangeLogParser in class SCM