desruisseaux commented on code in PR #328:
URL:
https://github.com/apache/maven-clean-plugin/pull/328#discussion_r3702518521
##########
src/main/java/org/apache/maven/plugins/clean/BackgroundCleaner.java:
##########
@@ -111,44 +161,67 @@ final class BackgroundCleaner extends Cleaner implements
Listener, Runnable {
private boolean disabled;
/**
- * Creates a new cleaner to be executed in a background thread.
+ * Creates a new background cleaner service.
+ * Use {@link #getOrCreate} to obtain a session-scoped instance.
*
- * @param session the Maven session to be used
- * @param matcherFactory the service to use for creating include and
exclude filters.
- * @param logger the logger to use
- * @param verbose whether to perform verbose logging
- * @param fastDir the explicit configured directory or to be
deleted in fast mode
- * @param fastMode the fast deletion mode
- * @param followSymlinks whether to follow symlinks
- * @param force whether to force the deletion of read-only files
- * @param failOnError whether to abort with an exception in case a
selected file/directory could not be deleted
- * @param retryOnError whether to undertake additional delete attempts
in case the first attempt failed
+ * @param session the Maven session to be used
+ * @param logger the logger to use
+ * @param fastDir the directory where to temporarily move the files to
delete
+ * @param fastMode the fast deletion mode
*/
- @SuppressWarnings("checkstyle:ParameterNumber")
- BackgroundCleaner(
- @Nonnull Session session,
- @Nonnull PathMatcherFactory matcherFactory,
- @Nonnull Log logger,
- boolean verbose,
- @Nonnull Path fastDir,
- @Nonnull FastMode fastMode,
- boolean followSymlinks,
- boolean force,
- boolean failOnError,
- boolean retryOnError) {
- super(matcherFactory, logger, verbose, followSymlinks, force,
failOnError, retryOnError);
+ private BackgroundCleaner(
+ @Nonnull Session session, @Nonnull Log logger, @Nonnull Path
fastDir, @Nonnull FastMode fastMode) {
this.session = session;
+ this.logger = logger;
this.fastDir = fastDir;
this.fastMode = fastMode;
filesToDeleteAtEnd = (fastMode != FastMode.BACKGROUND) ? new
ArrayList<>() : null;
directoriesToDeleteIfEmpty = new LinkedHashSet<>(); // Will need to
delete in order.
executor = Executors.newSingleThreadExecutor((task) -> new
Thread(task, "mvn-background-cleaner"));
+ session.registerListener(this);
+ scanForLeftovers();
+ }
+
+ /**
+ * Returns the session-scoped {@code BackgroundCleaner}, creating it on
first access.
+ * The instance is stored in {@link SessionData} so that all modules in a
reactor
+ * share the same background thread and session listener.
+ *
+ * @param session the Maven session to be used
+ * @param logger the logger to use
+ * @param fastDir the directory where to temporarily move the files to
delete
+ * @param fastMode the fast deletion mode
+ * @return the shared background cleaner instance for the session
+ */
+ static BackgroundCleaner getOrCreate(
+ @Nonnull Session session, @Nonnull Log logger, @Nonnull Path
fastDir, @Nonnull FastMode fastMode) {
+ return session.getData().computeIfAbsent(KEY, () -> new
BackgroundCleaner(session, logger, fastDir, fastMode));
+ }
+
+ /**
+ * Scans the fast directory for leftover directories from previous
(possibly killed) builds
+ * and queues them for background deletion. This restores the cleanup
behavior that was
+ * present in the singleton pattern of version 3.5.0 but was lost when
switching to
+ * per-module instances.
+ */
+ private void scanForLeftovers() {
+ if (Files.isDirectory(fastDir)) {
+ try (DirectoryStream<Path> stream =
Files.newDirectoryStream(fastDir)) {
+ for (Path child : stream) {
+ if (Files.isDirectory(child)) {
+ logger.debug("Cleaning leftover directory from
previous build: " + child);
+ executor.submit(() -> deleteInBackground(child, false,
true));
+ }
+ }
+ } catch (IOException e) {
+ logger.debug("Failed to scan for leftover directories in " +
fastDir + ": " + e);
+ }
+ }
}
/**
* Returns an error message to show to user if the fast delete failed.
*/
- @Override
String fastDeleteError(IOException e) {
Review Comment:
If this method no longer override a method from the parent class, I presume
that it can be made private. Then, if this method appears to be invoked in only
one place, maybe it can be completely removed and replaced by moving this code
inline at the invocation place, if that make the code easier to follow.
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