/**
* Simply check whether the block exists, in such a way that we don't fetch the full content. If
* it does exist then the USK tracker, and therefore any fetchers, will be updated. You can pass
* either an SSK or a USK.
*/
public void hintCheck(
FreenetURI uri,
final Object token,
ClientContext context,
short priority,
final HintCallback cb)
throws MalformedURLException {
final FreenetURI origURI = uri;
if (uri.isUSK()) uri = uri.sskForUSK();
if (logMINOR) Logger.minor(this, "Doing hint fetch for " + uri);
final ClientGetter get =
new ClientGetter(
new ClientGetCallback() {
@Override
public void onMajorProgress(ObjectContainer container) {
// Ignore
}
@Override
public void onSuccess(
FetchResult result, ClientGetter state, ObjectContainer container) {
cb.success(origURI, token);
}
@Override
public void onFailure(
FetchException e, ClientGetter state, ObjectContainer container) {
if (e.isDataFound()) cb.success(origURI, token);
else if (e.isDNF()) cb.dnf(origURI, token, e);
else cb.failed(origURI, token, e);
}
},
uri,
new FetchContext(backgroundFetchContext, FetchContext.IDENTICAL_MASK, false, null),
priority,
rcBulk,
new NullBucket(),
null,
null);
try {
get.start(null, context);
} catch (FetchException e) {
if (logMINOR) Logger.minor(this, "Cannot start hint fetch for " + uri + " : " + e, e);
if (e.isDataFound()) cb.success(origURI, token);
else if (e.isDNF()) cb.dnf(origURI, token, e);
else cb.failed(origURI, token, e);
}
}
