public void resolve(DependencyMetaData dependency, BuildableComponentResolveResult result) {
ModuleVersionSelector requested = dependency.getRequested();
LOGGER.debug("Attempting to resolve {} using repositories {}", requested, repositoryNames);
ModuleComponentIdentifier moduleComponentIdentifier =
new DefaultModuleComponentIdentifier(
requested.getGroup(), requested.getName(), requested.getVersion());
ModuleVersionIdentifier moduleVersionIdentifier =
new DefaultModuleVersionIdentifier(
requested.getGroup(), requested.getName(), requested.getVersion());
List<Throwable> errors = new ArrayList<Throwable>();
List<ComponentMetaDataResolveState> resolveStates =
new ArrayList<ComponentMetaDataResolveState>();
for (ModuleComponentRepository repository : repositories) {
resolveStates.add(
new ComponentMetaDataResolveState(
dependency, moduleComponentIdentifier, repository, componentChooser));
}
final RepositoryChainModuleResolution latestResolved = findBestMatch(resolveStates, errors);
if (latestResolved != null) {
LOGGER.debug("Using {} from {}", latestResolved.module.getId(), latestResolved.repository);
for (Throwable error : errors) {
LOGGER.debug("Discarding resolve failure.", error);
}
result.resolved(metaDataFactory.transform(latestResolved));
return;
}
if (!errors.isEmpty()) {
result.failed(new ModuleVersionResolveException(moduleComponentIdentifier, errors));
} else {
for (ComponentMetaDataResolveState resolveState : resolveStates) {
resolveState.applyTo(result);
}
result.notFound(moduleVersionIdentifier);
}
}
private RepositoryChainModuleResolution findBestMatch(
LinkedList<ComponentMetaDataResolveState> queue,
Collection<Throwable> failures,
Collection<ComponentMetaDataResolveState> missing) {
RepositoryChainModuleResolution best = null;
while (!queue.isEmpty()) {
ComponentMetaDataResolveState request = queue.removeFirst();
BuildableModuleComponentMetaDataResolveResult metaDataResolveResult;
try {
metaDataResolveResult = request.resolve();
} catch (Throwable t) {
failures.add(t);
continue;
}
switch (metaDataResolveResult.getState()) {
case Missing:
// Queue this up for checking again later
if (request.canMakeFurtherAttempts()) {
missing.add(request);
}
break;
case Resolved:
RepositoryChainModuleResolution moduleResolution =
new RepositoryChainModuleResolution(
request.repository, metaDataResolveResult.getMetaData());
if (!metaDataResolveResult.getMetaData().isGenerated()) {
return moduleResolution;
}
best = best != null ? best : moduleResolution;
break;
default:
throw new IllegalStateException(
"Unexpected state for resolution: " + metaDataResolveResult.getState());
}
}
return best;
}
