/** Populates the result from the graph traversal state. */
private void assembleResult(ResolveState resolveState, DependencyGraphVisitor listener) {
listener.start(resolveState.root);
// Visit the nodes
for (ConfigurationNode resolvedConfiguration : resolveState.getConfigurationNodes()) {
if (resolvedConfiguration.isSelected()) {
resolvedConfiguration.validate();
listener.visitNode(resolvedConfiguration);
}
}
// Visit the edges
for (ConfigurationNode resolvedConfiguration : resolveState.getConfigurationNodes()) {
if (resolvedConfiguration.isSelected()) {
listener.visitEdge(resolvedConfiguration);
}
}
listener.finish(resolveState.root);
}
public DependencyEdge(
ConfigurationNode from,
DependencyMetaData dependencyMetaData,
ModuleResolutionFilter resolutionFilter,
ResolveState resolveState) {
this.from = from;
this.dependencyMetaData = dependencyMetaData;
this.resolutionFilter = resolutionFilter;
this.resolveState = resolveState;
selector = resolveState.getSelector(dependencyMetaData);
}
private ModuleVersionSelectorResolveState(
DependencyMetaData dependencyMetaData,
DependencyToComponentIdResolver resolver,
ResolveState resolveState) {
this.dependencyMetaData = dependencyMetaData;
this.resolver = resolver;
this.resolveState = resolveState;
targetModule =
resolveState.getModule(
new DefaultModuleIdentifier(
dependencyMetaData.getRequested().getGroup(),
dependencyMetaData.getRequested().getName()));
}
public void restart(ModuleVersionResolveState selected) {
// Restarting this configuration after conflict resolution.
// If this configuration belongs to the select version, queue ourselves up for traversal.
// If not, then remove our incoming edges, which triggers them to be moved across to the
// selected configuration
if (moduleRevision == selected) {
resolveState.onMoreSelected(this);
} else {
for (DependencyEdge dependency : incomingEdges) {
dependency.restart(selected);
}
incomingEdges.clear();
}
}
private void calculateTargetConfigurations() {
targetConfigurations.clear();
ComponentResolveMetaData targetModuleVersion = targetModuleRevision.getMetaData();
if (targetModuleVersion == null) {
// Broken version
return;
}
Set<ConfigurationMetaData> targetConfigurations =
resolveState.dependencyToConfigurationResolver.resolveTargetConfigurations(
dependencyMetaData, from.metaData, targetModuleVersion);
for (ConfigurationMetaData targetConfiguration : targetConfigurations) {
ConfigurationNode targetConfigurationNode =
resolveState.getConfigurationNode(targetModuleRevision, targetConfiguration.getName());
this.targetConfigurations.add(targetConfigurationNode);
}
}
/** @return The module version, or null if there is a failure to resolve this selector. */
public ModuleVersionResolveState resolveModuleRevisionId() {
if (targetModuleRevision != null) {
return targetModuleRevision;
}
if (failure != null) {
return null;
}
idResolveResult = new DefaultBuildableComponentIdResolveResult();
resolver.resolve(dependencyMetaData, idResolveResult);
if (idResolveResult.getFailure() != null) {
failure = idResolveResult.getFailure();
return null;
}
targetModuleRevision = resolveState.getRevision(idResolveResult.getModuleVersionId());
targetModuleRevision.addResolver(this);
targetModuleRevision.selectionReason = idResolveResult.getSelectionReason();
targetModule = targetModuleRevision.module;
targetModule.addSelector(this);
return targetModuleRevision;
}
public void removeIncomingEdge(DependencyEdge dependencyEdge) {
incomingEdges.remove(dependencyEdge);
resolveState.onFewerSelected(this);
}
public void addIncomingEdge(DependencyEdge dependencyEdge) {
incomingEdges.add(dependencyEdge);
resolveState.onMoreSelected(this);
}
/**
* 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);
}
});
}
});
}
}
}