/**
* Check if resources from a group were changed. If a change is detected, the changeListener will
* be invoked.
*
* @param cacheEntry the cache key which was requested. The key contains the groupName which has
* to be checked for changes.
*/
public void check(final CacheKey cacheEntry) {
Validate.notNull(cacheEntry);
LOG.debug("ResourceWatcher started...");
final StopWatch watch = new StopWatch();
watch.start("detect changes");
try {
final Group group =
new WroModelInspector(modelFactory.create()).getGroupByName(cacheEntry.getGroupName());
if (isGroupChanged(group.collectResourcesOfType(cacheEntry.getType()))) {
onGroupChanged(cacheEntry);
}
changeDetector.reset();
} catch (final Exception e) {
onException(e);
} finally {
watch.stop();
LOG.debug("resource watcher info: {}", watch.prettyPrint());
}
}
/**
* Check if resources from a group were changed. If a change is detected, the changeListener will
* be invoked.
*
* @param cacheKey the cache key which was requested. The key contains the groupName which has to
* be checked for changes.
*/
public void check(final CacheKey cacheKey, final Callback callback) {
notNull(cacheKey);
LOG.debug("started");
final StopWatch watch = new StopWatch();
watch.start("detect changes");
try {
final Group group =
new WroModelInspector(modelFactory.create()).getGroupByName(cacheKey.getGroupName());
if (isGroupChanged(group.collectResourcesOfType(cacheKey.getType()), callback)) {
callback.onGroupChanged(cacheKey);
cacheStrategy.put(cacheKey, null);
}
resourceChangeDetector.reset();
} catch (final Exception e) {
onException(e);
} finally {
watch.stop();
LOG.debug("resource watcher info: {}", watch.prettyPrint());
}
}
/**
* Check if the resource was changed from previous run. The implementation uses resource content
* digest (hash) to check for change.
*
* @param resource the {@link Resource} to check.
* @return true if the resource was changed.
*/
private boolean isChanged(final Resource resource, final String groupName) {
boolean changed = false;
try {
final String uri = resource.getUri();
// using AtomicBoolean because we need to mutate this variable inside an anonymous class.
final AtomicBoolean changeDetected =
new AtomicBoolean(resourceChangeDetector.checkChangeForGroup(uri, groupName));
if (!changeDetected.get() && resource.getType() == ResourceType.CSS) {
final Reader reader = new InputStreamReader(locatorFactory.locate(uri));
LOG.debug("\tCheck @import directive from {}", resource);
createCssImportProcessor(changeDetected, groupName)
.process(resource, reader, new StringWriter());
}
changed = changeDetected.get();
} catch (final IOException e) {
LOG.debug(
"[FAIL] Cannot check {} resource (Exception message: {}). Assuming it is unchanged...",
resource,
e.getMessage());
}
LOG.debug("resource={}, changed={}", resource.getUri(), changed);
return changed;
}
