private void invalidateIfProjectBuildFileParserStateChanged(Cell cell) {
ImmutableMap<String, String> cellEnv = cell.getBuckConfig().getEnvironment();
Iterable<String> defaultIncludes = new ParserConfig(cell.getBuckConfig()).getDefaultIncludes();
boolean invalidateCaches = false;
try (AutoCloseableLock updateLock = cachedStateLock.updateLock()) {
Iterable<String> expected = cachedIncludes.get(cell.getRoot());
if (!cellEnv.equals(cachedEnvironment)) {
// Contents of System.getenv() have changed. Cowardly refuse to accept we'll parse
// everything the same way.
invalidateCaches = true;
} else if (expected == null || !Iterables.elementsEqual(defaultIncludes, expected)) {
// Someone's changed the default includes. That's almost definitely caused all our lovingly
// cached data to be enormously wonky.
invalidateCaches = true;
}
if (!invalidateCaches) {
return;
}
try (AutoCloseableLock writeLock = cachedStateLock.writeLock()) {
cachedEnvironment = cellEnv;
cachedIncludes.put(cell.getRoot(), defaultIncludes);
}
}
synchronized (this) {
invalidateAllCaches();
knownCells.add(cell);
}
}
@Override
public void invalidateBasedOn(WatchEvent<?> event) throws InterruptedException {
if (!WatchEvents.isPathChangeEvent(event)) {
// Non-path change event, likely an overflow due to many change events: invalidate everything.
LOG.debug("Parser invalidating entire cache on overflow.");
invalidateAllCaches();
return;
}
Path path = (Path) event.context();
for (Cell cell : knownCells) {
try {
if (isPathCreateOrDeleteEvent(event)) {
BuildFileTree buildFiles = buildFileTrees.get(cell);
if (path.endsWith(cell.getBuildFileName())) {
// If a build file has been added or removed, reconstruct the build file tree.
buildFileTrees.invalidate(cell);
}
// Added or removed files can affect globs, so invalidate the package build file
// "containing" {@code path} unless its filename matches a temp file pattern.
if (!isTempFile(cell, path)) {
invalidateContainingBuildFile(cell, buildFiles, path);
}
LOG.verbose("Invalidating dependents for path %s, cache state %s", path, this);
}
} catch (ExecutionException | UncheckedExecutionException e) {
try {
throw propagate(e);
} catch (BuildFileParseException bfpe) {
LOG.warn("Unable to parse already parsed build file.", bfpe);
}
}
}
invalidatePath(path);
}