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;
}
ModuleResolutionFilter resolutionFilter = getSelector(transitiveIncoming);
if (previousTraversal != null) {
if (previousTraversal.acceptsSameModulesAs(resolutionFilter)) {
LOGGER.debug(
"Changed edges for {} selects same versions as previous traversal. ignoring", this);
// Don't need to traverse again, but hang on to the new filter as the set of artifact may
// have changed
previousTraversal = resolutionFilter;
return;
}
removeOutgoingEdges();
}
for (DependencyMetaData dependency : metaData.getDependencies()) {
ModuleIdentifier targetModuleId =
DefaultModuleIdentifier.newId(
dependency.getRequested().getGroup(), dependency.getRequested().getName());
if (isExcluded(resolutionFilter, targetModuleId)) {
continue;
}
DependencyEdge dependencyEdge =
new DependencyEdge(this, dependency, resolutionFilter, resolveState);
outgoingEdges.add(dependencyEdge);
target.add(dependencyEdge);
}
previousTraversal = resolutionFilter;
}
public List<ModuleVersionResolveState> getIncoming() {
List<ModuleVersionResolveState> incoming = new ArrayList<ModuleVersionResolveState>();
for (DependencyGraphBuilder.ConfigurationNode configuration : configurations) {
for (DependencyGraphBuilder.DependencyEdge dependencyEdge : configuration.incomingEdges) {
incoming.add(dependencyEdge.from.moduleRevision);
}
}
return incoming;
}
private ModuleResolutionFilter getSelector(List<DependencyEdge> transitiveEdges) {
ModuleResolutionFilter resolutionFilter;
if (transitiveEdges.isEmpty()) {
resolutionFilter = DefaultModuleResolutionFilter.all();
} else {
resolutionFilter = transitiveEdges.get(0).getSelector();
for (int i = 1; i < transitiveEdges.size(); i++) {
DependencyEdge dependencyEdge = transitiveEdges.get(i);
resolutionFilter = resolutionFilter.union(dependencyEdge.getSelector());
}
}
resolutionFilter =
resolutionFilter.intersect(
DefaultModuleResolutionFilter.excludeAny(metaData.getExcludeRules()));
return resolutionFilter;
}
/**
* Traverses the dependency graph, resolving conflicts and building the paths from the root
* configuration.
*/
private void traverseGraph(
final ResolveState resolveState, final ConflictHandler conflictHandler) {
resolveState.onMoreSelected(resolveState.root);
List<DependencyEdge> dependencies = new ArrayList<DependencyEdge>();
while (resolveState.peek() != null || conflictHandler.hasConflicts()) {
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
PotentialConflict c = conflictHandler.registerModule(module);
if (!c.conflictExists()) {
// No conflict. Select it for now
LOGGER.debug("Selecting new module version {}", moduleRevision);
module.select(moduleRevision);
} else {
// We have a conflict
LOGGER.debug("Found new conflicting module version {}", moduleRevision);
// 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
// For each module participating in the conflict (many times there is only one
// participating module that has multiple versions)
c.withParticipatingModules(
new Action<ModuleIdentifier>() {
public void execute(ModuleIdentifier module) {
ModuleVersionResolveState previouslySelected =
resolveState.getModule(module).clearSelection();
if (previouslySelected != null) {
for (ConfigurationNode configuration : previouslySelected.configurations) {
configuration.deselect();
}
}
}
});
}
}
dependency.attachToTargetConfigurations();
}
} else {
// We have some batched up conflicts. Resolve the first, and continue traversing the graph
conflictHandler.resolveNextConflict(
new Action<ConflictResolutionResult>() {
public void execute(final ConflictResolutionResult result) {
result
.getConflict()
.withParticipatingModules(
new Action<ModuleIdentifier>() {
public void execute(ModuleIdentifier moduleIdentifier) {
ModuleVersionResolveState selected = result.getSelected();
// 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.
resolveState.getModule(moduleIdentifier).restart(selected);
}
});
}
});
}
}
}