public void visitOutgoingDependencies(Collection<DependencyEdge> target) {
// If this configuration's version is in conflict, don't do anything
// If not traversed before, add all selected outgoing edges
// If traversed before, and the selected modules have changed, remove previous outgoing edges
// and add outgoing edges again with
// the new selections.
// If traversed before, and the selected modules have not changed, ignore
// If none of the incoming edges are transitive, then the node has no outgoing edges
if (moduleRevision.state != ModuleState.Selected) {
LOGGER.debug("version for {} is not selected. ignoring.", this);
return;
}
List<DependencyEdge> transitiveIncoming = new ArrayList<DependencyEdge>();
for (DependencyEdge edge : incomingEdges) {
if (edge.isTransitive()) {
transitiveIncoming.add(edge);
}
}
if (transitiveIncoming.isEmpty() && this != resolveState.root) {
if (previousTraversal != null) {
removeOutgoingEdges();
}
if (incomingEdges.isEmpty()) {
LOGGER.debug("{} has no incoming edges. ignoring.", this);
} else {
LOGGER.debug("{} has no transitive incoming edges. ignoring outgoing edges.", this);
}
return;
}
ModuleVersionSpec selectorSpec = getSelector(transitiveIncoming);
if (previousTraversal != null) {
if (previousTraversal.acceptsSameModulesAs(selectorSpec)) {
LOGGER.debug(
"Changed edges for {} selects same versions as previous traversal. ignoring", this);
return;
}
removeOutgoingEdges();
}
for (DependencyMetaData dependency : metaData.getDependencies()) {
DependencyDescriptor dependencyDescriptor = dependency.getDescriptor();
ModuleId targetModuleId = dependencyDescriptor.getDependencyRevisionId().getModuleId();
if (!selectorSpec.isSatisfiedBy(targetModuleId)) {
LOGGER.debug("{} is excluded from {}.", targetModuleId, this);
continue;
}
DependencyEdge dependencyEdge =
new DependencyEdge(this, dependency, selectorSpec, resolveState);
outgoingEdges.add(dependencyEdge);
target.add(dependencyEdge);
}
previousTraversal = selectorSpec;
}
ModuleVersionResolveState select(
Collection<ModuleVersionResolveState> candidates, ModuleVersionResolveState root) {
for (ConfigurationNode configuration : root.configurations) {
for (DependencyEdge outgoingEdge : configuration.outgoingEdges) {
if (outgoingEdge.dependencyDescriptor.isForce()
&& candidates.contains(outgoingEdge.targetModuleRevision)) {
outgoingEdge.targetModuleRevision.selectionReason = VersionSelectionReasons.FORCED;
return outgoingEdge.targetModuleRevision;
}
}
}
return (ModuleVersionResolveState) resolver.select(candidates);
}
/**
* Traverses the dependency graph, resolving conflicts and building the paths from the root
* configuration.
*/
private void traverseGraph(ResolveState resolveState) {
Set<ModuleIdentifier> conflicts = new LinkedHashSet<ModuleIdentifier>();
resolveState.onMoreSelected(resolveState.root);
List<DependencyEdge> dependencies = new ArrayList<DependencyEdge>();
while (resolveState.peek() != null || !conflicts.isEmpty()) {
if (resolveState.peek() != null) {
ConfigurationNode node = resolveState.pop();
LOGGER.debug("Visiting configuration {}.", node);
// Calculate the outgoing edges of this configuration
dependencies.clear();
node.visitOutgoingDependencies(dependencies);
for (DependencyEdge dependency : dependencies) {
LOGGER.debug("Visiting dependency {}", dependency);
// Resolve dependency to a particular revision
ModuleVersionResolveState moduleRevision = dependency.resolveModuleRevisionId();
if (moduleRevision == null) {
// Failed to resolve.
continue;
}
ModuleIdentifier moduleId = moduleRevision.id.getModule();
// Check for a new conflict
if (moduleRevision.state == ModuleState.New) {
ModuleResolveState module = resolveState.getModule(moduleId);
// A new module revision. Check for conflict
Collection<ModuleVersionResolveState> versions = module.getVersions();
if (versions.size() == 1) {
// First version of this module. Select it for now
LOGGER.debug("Selecting new module version {}", moduleRevision);
module.select(moduleRevision);
} else {
// Not the first version of this module. We have a new conflict
LOGGER.debug("Found new conflicting module version {}", moduleRevision);
conflicts.add(moduleId);
// Deselect the currently selected version, and remove all outgoing edges from the
// version
// This will propagate through the graph and prune configurations that are no longer
// required
ModuleVersionResolveState previouslySelected = module.clearSelection();
if (previouslySelected != null) {
for (ConfigurationNode configuration : previouslySelected.configurations) {
configuration.removeOutgoingEdges();
}
}
}
}
dependency.attachToTargetConfigurations();
}
} else {
// We have some batched up conflicts. Resolve the first, and continue traversing the graph
ModuleIdentifier moduleId = conflicts.iterator().next();
conflicts.remove(moduleId);
ModuleResolveState module = resolveState.getModule(moduleId);
ModuleVersionResolveState selected =
conflictResolver.select(module.getVersions(), resolveState.root.moduleRevision);
LOGGER.debug("Selected {} from conflicting modules {}.", selected, module.getVersions());
// Restart each configuration. For the evicted configuration, this means moving incoming
// dependencies across to the
// matching selected configuration. For the select configuration, this mean traversing its
// dependencies.
module.restart(selected);
}
}
}