/// <summary>
/// Builds this target if it has not already been built as part of its parent project. Before we actually execute the
/// tasks for this target, though, we first call on all the dependent targets to build themselves.
/// This function may throw InvalidProjectFileException
/// </summary>
internal void Build
(
ProjectBuildState buildContext
)
{
// Depending on the build state, we may do different things.
switch (buildState)
{
case BuildState.InProgress:
// In single proc mode if the build state was already "in progress"
// and somebody just told us to build ourselves, it means that there is
// a loop (circular dependency) in the target dependency graph. In multi
// proc mode we need to analyze the dependency graph before we can
// tell if there a circular dependency or if two independent chains
// of targets happen to need the result of this target.
if (parentEngine.Router.SingleThreadedMode || buildContext.ContainsCycle(this.Name))
{
ProjectErrorUtilities.VerifyThrowInvalidProject(false, TargetElement, "CircularDependency", targetName);
}
else
{
buildContext.CurrentBuildContextState = ProjectBuildState.BuildContextState.WaitingForTarget;
this.executionState.AddWaitingBuildContext(buildContext);
}
break;
case BuildState.CompletedSuccessfully:
case BuildState.CompletedUnsuccessfully:
// If this target has already been built as part of this project,
// we're not going to build it again. Just return the result
// from when it was built previously. Note: This condition
// could really only ever hold true if the user specifically
// requested us to build multiple targets and there existed
// a direct or indirect dependency relationship between two or
// more of those top-level targets.
// Note: we aren't really entering the target in question here, so don't use the target
// event context. Using the target ID for skipped messages would force us to
// cache the individual target IDs for unloaded projects and it's not really worth the trouble.
// Just use the parent event context.
parentEngine.LoggingServices.LogComment(buildContext.ProjectBuildEventContext,
((buildState == BuildState.CompletedSuccessfully) ? "TargetAlreadyCompleteSuccess" : "TargetAlreadyCompleteFailure"),
this.targetName);
// Only contexts which are generated from an MSBuild task could need
// the outputs of this target, such contexts have a non-null evaluation
// request
if ((buildState == BuildState.CompletedSuccessfully) &&
(buildContext.BuildRequest.OutputsByTarget != null &&
buildContext.NameOfBlockingTarget == null))
{
error.VerifyThrow(
String.Compare(EscapingUtilities.UnescapeAll(buildContext.NameOfTargetInProgress), this.Name, StringComparison.OrdinalIgnoreCase) == 0,
"The name of the target in progress is inconsistent with the target being built");
error.VerifyThrow(targetOutputItems != null,
"If the target built successfully, we must have its outputs.");
buildContext.BuildRequest.OutputsByTarget[Name] = targetOutputItems.ToArray();
}
if (buildContext.NameOfBlockingTarget == null)
{
buildContext.BuildRequest.ResultByTarget[Name] = buildState;
}
break;
case BuildState.NotStarted:
case BuildState.Skipped:
{
// Always have to create a new context in build as other projects or targets may try and build this target
BuildEventContext targetBuildEventContext = new BuildEventContext
(
buildContext.ProjectBuildEventContext.NodeId,
this.id,
buildContext.ProjectBuildEventContext.ProjectContextId,
buildContext.ProjectBuildEventContext.TaskId
);
Expander expander = new Expander(this.parentProject.evaluatedProperties, this.parentProject.evaluatedItemsByName);
// We first make sure no batching was attempted with the target's condition.
if (!conditionCheckedForInvalidMetadataReferences)
{
if (ExpressionShredder.ContainsMetadataExpressionOutsideTransform(this.Condition))
{
ProjectErrorUtilities.ThrowInvalidProject(this.conditionAttribute, "TargetConditionHasInvalidMetadataReference", targetName, this.Condition);
}
conditionCheckedForInvalidMetadataReferences = true;
}
// If condition is false (based on propertyBag), set this target's state to
// "Skipped" since we won't actually build it.
if (!Utilities.EvaluateCondition(this.Condition, this.conditionAttribute,
expander, null, ParserOptions.AllowProperties | ParserOptions.AllowItemLists,
parentEngine.LoggingServices, targetBuildEventContext))
{
buildState = BuildState.Skipped;
if (buildContext.NameOfBlockingTarget == null)
{
buildContext.BuildRequest.ResultByTarget[Name] = buildState;
}
if (!parentEngine.LoggingServices.OnlyLogCriticalEvents)
{
// Expand the expression for the Log.
string expanded = expander.ExpandAllIntoString(this.Condition, this.conditionAttribute);
// By design: Not building dependencies. This is what NAnt does too.
parentEngine.LoggingServices.LogComment(targetBuildEventContext, "TargetSkippedFalseCondition",
this.targetName, this.Condition, expanded);
}
}
else
{
// This target has not been built yet. So build it!
// Change our state to "in progress". TargetParameters will need to be re-calculated if Inputs and Outputs attribute has changed.
buildState = BuildState.InProgress;
List <string> batchableTargetParameters = GetBatchableTargetParameters();
executionState = new TargetExecutionWrapper(this, taskElementList, batchableTargetParameters, targetElement, expander, targetBuildEventContext);
ContinueBuild(buildContext, null);
}
}
break;
default:
error.VerifyThrow(false, "Build state {0} not handled in Target.Build method", buildState);
break;
}
}
/// <summary>
/// Determines how many times the batchable object needs to be executed (each execution is termed a "batch"), and prepares
/// buckets of items to pass to the object in each batch.
/// </summary>
/// <param name="parentNode"></param>
/// <param name="batchableObjectParameters"></param>
/// <param name="lookup"></param>
/// <param name="implicitBatchableItemType">Any item type that can be considered an implicit input to this batchable object.
/// This is useful for items inside targets, where the item name is plainly an item type that's an "input" to the object.</param>
/// <returns>ArrayList containing ItemBucket objects, each one representing an execution batch.</returns>
internal static ArrayList PrepareBatchingBuckets
(
XmlNode parentNode,
List <string> batchableObjectParameters,
Lookup lookup,
string implicitBatchableItemType
)
{
ErrorUtilities.VerifyThrow(parentNode != null, "Need the XML node that represents the batchable object.");
ErrorUtilities.VerifyThrow(batchableObjectParameters != null, "Need the parameters of the batchable object to determine if it can be batched.");
ErrorUtilities.VerifyThrow(lookup != null, "Need to specify the lookup.");
ItemsAndMetadataPair pair = ExpressionShredder.GetReferencedItemNamesAndMetadata(batchableObjectParameters);
// All the @(itemname) item list references in the tag, including transforms, etc.
// The keys in the hashtable are the item names, and the values are all String.Empty (not used).
Hashtable consumedItemReferences = pair.Items;
// All the %(itemname.metadataname) references in the tag (not counting those embedded
// inside item transforms), and note that the itemname portion is optional.
// The keys in the returned hash table are the qualified metadata names (e.g. "EmbeddedResource.Culture"
// or just "Culture"). The values are MetadataReference structs, which simply split out the item
// name (possibly null) and the actual metadata name.
Dictionary <string, MetadataReference> consumedMetadataReferences = pair.Metadata;
ArrayList buckets = null;
if (consumedMetadataReferences?.Count > 0)
{
// Add any item types that we were explicitly told to assume.
if (implicitBatchableItemType != null)
{
consumedItemReferences = Utilities.CreateTableIfNecessary(consumedItemReferences);
consumedItemReferences[implicitBatchableItemType] = String.Empty;
}
// This method goes through all the item list references and figures out which ones
// will be participating in batching, and which ones won't. We get back a hashtable
// where the key is the item name that will be participating in batching. The values
// are all String.Empty (not used). This method may return additional item names
// that weren't represented in "consumedItemReferences"... this would happen if there
// were qualified metadata references in the consumedMetadataReferences table, such as
// %(EmbeddedResource.Culture).
Hashtable itemListsToBeBatched = GetItemListsToBeBatched(parentNode, consumedMetadataReferences, consumedItemReferences, lookup);
// At this point, if there were any metadata references in the tag, but no item
// references to batch on, we've got a problem because we can't figure out which
// item lists the user wants us to batch.
if (itemListsToBeBatched.Count == 0)
{
foreach (string unqualifiedMetadataName in consumedMetadataReferences.Keys)
{
// Of course, since this throws an exception, there's no way we're ever going
// to really loop here... it's just that the foreach is the only way I can
// figure out how to get data out of the hashtable without knowing any of the
// keys!
ProjectErrorUtilities.VerifyThrowInvalidProject(false,
parentNode, "CannotReferenceItemMetadataWithoutItemName", unqualifiedMetadataName);
}
}
else
{
// If the batchable object consumes item metadata as well as items to be batched,
// we need to partition the items consumed by the object.
buckets = BucketConsumedItems(parentNode, lookup, itemListsToBeBatched, consumedMetadataReferences);
}
}
// if the batchable object does not consume any item metadata or items, or if the item lists it consumes are all
// empty, then the object does not need to be batched
if ((buckets == null) || (buckets.Count == 0))
{
// create a default bucket that references the project items and properties -- this way we always have a bucket
buckets = new ArrayList(1);
buckets.Add(new ItemBucket(null, null, lookup, buckets.Count));
}
return(buckets);
}
