public CacheDirectiveIterator(ClientProtocol namenode, CacheDirectiveInfo filter,
Sampler <object> traceSampler)
: base(0L)
{
this.namenode = namenode;
this.filter = filter;
this.traceSampler = traceSampler;
}
/// <summary>
/// Creates a builder with all elements set to the same values as the
/// given CacheDirectiveInfo.
/// </summary>
public Builder(CacheDirectiveInfo directive)
{
this.id = directive.GetId();
this.path = directive.GetPath();
this.replication = directive.GetReplication();
this.pool = directive.GetPool();
this.expiration = directive.GetExpiration();
}
public override bool Equals(object o)
{
if (o == null)
{
return(false);
}
if (GetType() != o.GetType())
{
return(false);
}
CacheDirectiveInfo other = (CacheDirectiveInfo)o;
return(new EqualsBuilder().Append(GetId(), other.GetId()).Append(GetPath(), other
.GetPath()).Append(GetReplication(), other.GetReplication()).Append(GetPool(), other
.GetPool()).Append(GetExpiration(), other.GetExpiration()).IsEquals());
}
/// <exception cref="System.IO.IOException"/>
public override BatchedRemoteIterator.BatchedEntries <CacheDirectiveEntry> MakeRequest
(long prevKey)
{
BatchedRemoteIterator.BatchedEntries <CacheDirectiveEntry> entries = null;
TraceScope scope = Trace.StartSpan("listCacheDirectives", traceSampler);
try
{
entries = namenode.ListCacheDirectives(prevKey, filter);
}
catch (IOException e)
{
if (e.Message.Contains("Filtering by ID is unsupported"))
{
// Retry case for old servers, do the filtering client-side
long id = filter.GetId();
filter = RemoveIdFromFilter(filter);
// Using id - 1 as prevId should get us a window containing the id
// This is somewhat brittle, since it depends on directives being
// returned in order of ascending ID.
entries = namenode.ListCacheDirectives(id - 1, filter);
for (int i = 0; i < entries.Size(); i++)
{
CacheDirectiveEntry entry = entries.Get(i);
if (entry.GetInfo().GetId().Equals((long)id))
{
return(new CacheDirectiveIterator.SingleEntry(entry));
}
}
throw new RemoteException(typeof(InvalidRequestException).FullName, "Did not find requested id "
+ id);
}
throw;
}
finally
{
scope.Close();
}
Preconditions.CheckNotNull(entries);
return(entries);
}
public CacheDirectiveEntry(CacheDirectiveInfo info, CacheDirectiveStats stats)
{
this.info = info;
this.stats = stats;
}
private static CacheDirectiveInfo RemoveIdFromFilter(CacheDirectiveInfo filter)
{
CacheDirectiveInfo.Builder builder = new CacheDirectiveInfo.Builder(filter);
builder.SetId(null);
return(builder.Build());
}
public CacheDirective(CacheDirectiveInfo info)
: this(info.GetId(), info.GetPath().ToUri().GetPath(), info.GetReplication(), info
.GetExpiration().GetAbsoluteMillis())
{
}
