/**
* A non-authoritative hint that a specific edition *might* exist. At the moment, we just fetch
* the block. We do not fetch the contents, and it is possible that USKFetcher's are also fetching
* the block. FIXME would it be more efficient to pass it along to a USKFetcher?
*
* @param context
* @throws MalformedURLException If the uri passed in is not a USK.
*/
public void hintUpdate(FreenetURI uri, ClientContext context, short priority)
throws MalformedURLException {
if (uri.getSuggestedEdition() < lookupLatestSlot(USK.create(uri))) {
if (logMINOR)
Logger.minor(
this,
"Ignoring hint because edition is "
+ uri.getSuggestedEdition()
+ " but latest is "
+ lookupLatestSlot(USK.create(uri)));
return;
}
uri = uri.sskForUSK();
if (logMINOR) Logger.minor(this, "Doing hint fetch for " + uri);
final ClientGetter get =
new ClientGetter(
new NullClientCallback(),
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);
// Ignore
}
}
/**
* 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);
}
}
/**
* A non-authoritative hint that a specific edition *might* exist. At the moment, we just fetch
* the block. We do not fetch the contents, and it is possible that USKFetcher's are also fetching
* the block. FIXME would it be more efficient to pass it along to a USKFetcher?
*
* @param usk
* @param edition
* @param context
*/
public void hintUpdate(USK usk, long edition, ClientContext context) {
if (edition < lookupLatestSlot(usk)) return;
FreenetURI uri = usk.copy(edition).getURI().sskForUSK();
final ClientGetter get =
new ClientGetter(
new NullClientCallback(),
uri,
new FetchContext(backgroundFetchContext, FetchContext.IDENTICAL_MASK, false, null),
RequestStarter.UPDATE_PRIORITY_CLASS,
rcBulk,
new NullBucket(),
null,
null);
try {
get.start(null, context);
} catch (FetchException e) {
// Ignore
}
}
@Override
public void run() {
if (logDEBUG) Logger.debug(this, "Running prefetch checker...");
ArrayList<USK> toFetch = null;
long now = System.currentTimeMillis();
boolean empty = true;
synchronized (USKManager.this) {
for (Map.Entry<USK, Long> entry : temporaryBackgroundFetchersPrefetch.entrySet()) {
empty = false;
if (entry.getValue() > 0 && now - entry.getValue() >= PREFETCH_DELAY) {
if (toFetch == null) toFetch = new ArrayList<USK>();
USK clear = entry.getKey();
long l = lookupLatestSlot(clear);
if (lookupKnownGood(clear) < l) toFetch.add(clear.copy(l));
entry.setValue(-1L); // Reset counter until new data comes in
} else {
if (logMINOR)
Logger.minor(
this, "Not prefetching: " + entry.getKey() + " : " + entry.getValue());
}
}
}
if (toFetch == null) return;
for (final USK key : toFetch) {
final long l = key.suggestedEdition;
if (logMINOR)
Logger.minor(
this, "Prefetching content for background fetch for edition " + l + " on " + key);
FetchContext fctx =
new FetchContext(realFetchContext, FetchContext.IDENTICAL_MASK, false, null);
final ClientGetter get =
new ClientGetter(
new ClientGetCallback() {
@Override
public void onFailure(
FetchException e, ClientGetter state, ObjectContainer container) {
if (e.newURI != null) {
if (logMINOR)
Logger.minor(this, "Prefetch succeeded with redirect for " + key);
updateKnownGood(key, l, context);
return;
} else {
if (logMINOR)
Logger.minor(this, "Prefetch failed later: " + e + " for " + key, e);
// Ignore
}
}
@Override
public void onSuccess(
FetchResult result, ClientGetter state, ObjectContainer container) {
if (logMINOR) Logger.minor(this, "Prefetch succeeded for " + key);
result.asBucket().free();
updateKnownGood(key, l, context);
}
@Override
public void onMajorProgress(ObjectContainer container) {
// Ignore
}
},
key.getURI().sskForUSK() /* FIXME add getSSKURI() */,
fctx,
RequestStarter.UPDATE_PRIORITY_CLASS,
rcBulk,
new NullBucket(),
null,
null);
try {
get.start(null, context);
} catch (FetchException e) {
if (logMINOR) Logger.minor(this, "Prefetch failed: " + e, e);
// Ignore
}
}
if (!empty) schedulePrefetchChecker();
}