| workspace use-case that Eclipse fails to handle: build newly-opened project [message #329063] |
Wed, 11 June 2008 15:54 |
 Paul E. Keyser
Messages: 878
Registered: July 2009 |
Senior Member |
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R3.x
WinXP
Imagine that one has N projects of type "pro" (pro != java) and that
upon startup some of those projects are closed. Now the user opens one
of those projects, and the system wants to create the in-memory model --
i.e., we need to "build" the project.
Eclipse does not apparently provide a means to do this. (See below for
my attempts to work around this. Moreover, there does not seem to be a
method within the Eclipse framework even to *determine* if a project
needs to be built -- no "IProject.isDirty()", no
"Workbench.isProjectBuilt(IProject)", etc. )
So -- what is the best-practices hack to accomplish this?
thanks,
Paul
============================================================ ========
a) if I try to use an IResourceChangeListener, I can parse the various
codes and types and deltas and resources that are sent under various
conditions, and the case at hand ("project opened") is signaled by
(IResourceChangeEvent.getType() & IResourceChangeEvent.POST_CHANGE) !=
0, when also IResourceChangeEvent.getDelta().getAffectedChildren()
contains an IResourceDelta for which (IResourceDelta.getResource()
instanceof IProject && ((IResourceDelta.getFlags() &
IResourceDelta.OPEN) != 0) &&
IResourceDelta.getResource().getProject().isOpen() -- at least, as far
as I can tell.
BUT, if at that point, I try to call:
project.build(IncrementalProjectBuilder.FULL_BUILD, monitor)
(or CLEAN_BUILD)
I get a
!MESSAGE The resource tree is locked for modifications.
!STACK 1
org.eclipse.core.internal.resources.ResourceException: The resource tree
is locked for modifications.
at
org.eclipse.core.internal.resources.WorkManager.checkIn(Work Manager.java:94)
at
org.eclipse.core.internal.resources.Workspace.prepareOperati on(Workspace.java:1684)
at org.eclipse.core.internal.resources.Project.build(Project.ja va:80)
consistent with the javadocs for IResourceChangeEvent.
============================================================ ========
b) no other relevant message from the IResourceChangeListener is
available, and only the IResourceChangeEvent.PRE_BUILD and
IResourceChangeEvent.POST_BUILD types occur when the resource-tree is
"open" -- but they are not sent when a project is *opened* because no
build occurs then!
============================================================ ========
c) the ISaveParticipant recommended at some point is not relevant to
this case (the workspace is not being *saved* when a project is newly
opened).
============================================================ ========
d) what I'm doing now is to spawn a Job to build and making it wait
until the "resource tree" is no longer locked, like this:
public IStatus run(final IProgressMonitor monitor) {
while (_project.getWorkspace().isTreeLocked()) {
try {
Thread.sleep(100);
} catch (InterruptedException exn) {
; // deliberately no-op: just wait some more
}
}
try {
_project.build(IncrementalProjectBuilder.CLEAN_BUILD,
monitor);
return Status.OK_STATUS;
} catch (Exception exn) {
Status status = new Status(
IStatus.ERROR, Activator.PLUGIN_ID, IStatus.OK,
exn.getMessage(), exn);
Activator.getDefault().getLog().log(status);
return status;
} finally {
if (null != monitor) {
monitor.done();
}
}
}
============================================================ ========
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