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Work around failed metadata lookups with Rackspace 

Previously BlobStore.list and thus BlobStore.clearContainer serialized
on synchronous and failed CDN lookups.  This effectively prevents
clearing any large container.  We cache a negative entry to work
around this.  This commit is similar to commit 3c7b965 to
hpcloud-objectstorage.
This commit is contained in:
Andrew Gaul 2013-01-17 16:26:02 -08:00
parent fed4cf5a4c
commit d96777ca70
2 changed files with 22 additions and 7 deletions
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22
apis/cloudfiles/src/main/java/org/jclouds/cloudfiles/blobstore/functions/PublicUriForObjectInfo.java
View File

@ -44,16 +44,28 @@ public class PublicUriForObjectInfo implements Function<ObjectInfo, URI> {
this.cdnContainer = cdnContainer;
}
private static final URI NEGATIVE_ENTRY = URI.create("http://127.0.0.1");
public URI apply(ObjectInfo from) {
if (from == null)
return null;
try {
return uriBuilder(cdnContainer.getUnchecked(from.getContainer()))
.clearQuery().appendPath(from.getName()).build();
} catch (NullPointerException e) {
// nulls not permitted from cache loader
String containerName = from.getContainer();
if (containerName == null)
return null;
try {
URI uri = cdnContainer.getUnchecked(containerName);
if (uri == NEGATIVE_ENTRY) { // intentionally use reference equality
// TODO: GetCDNMetadata.load returns null on failure cases. We use
// a negative entry to avoid repeatedly issuing failed CDN queries.
// The LoadingCache removes this value after its normal expiry.
return null;
}
return uriBuilder(uri).clearQuery().appendPath(from.getName()).build();
} catch (CacheLoader.InvalidCacheLoadException e) {
// nulls not permitted from cache loader
cdnContainer.put(containerName, NEGATIVE_ENTRY);
return null;
} catch (NullPointerException e) {
// nulls not permitted from cache loader
return null;
}

7
providers/hpcloud-objectstorage/src/main/java/org/jclouds/hpcloud/objectstorage/blobstore/functions/PublicUriForObjectInfo.java
View File

@ -48,8 +48,11 @@ public class PublicUriForObjectInfo implements Function<ObjectInfo, URI> {
public URI apply(ObjectInfo from) {
if (from == null)
return null;
String containerName = from.getContainer();
if (containerName == null)
return null;
try {
URI uri = cdnContainer.getUnchecked(from.getContainer());
URI uri = cdnContainer.getUnchecked(containerName);
if (uri == NEGATIVE_ENTRY) { // intentionally use reference equality
// TODO: GetCDNMetadata.load returns null on failure cases. We use
// a negative entry to avoid repeatedly issuing failed CDN queries.
@ -59,7 +62,7 @@ public class PublicUriForObjectInfo implements Function<ObjectInfo, URI> {
return uriBuilder(uri).clearQuery().appendPath(from.getName()).build();
} catch (CacheLoader.InvalidCacheLoadException e) {
// nulls not permitted from cache loader
cdnContainer.put(from.getContainer(), NEGATIVE_ENTRY);
cdnContainer.put(containerName, NEGATIVE_ENTRY);
return null;
} catch (NullPointerException e) {
// nulls not permitted from cache loader