public IFuture <HttpQueryResponse> ProcessQuery(string name,
IDictionary <string, string> options, AsyncCallback callback, object state)
{
QueryRequestMessage request = new QueryRequestMessage.Builder()
.SetName(name)
.AddRangeOptions(GetQueryOptions(options))
.Build();
RubyMessagePacket packet = GetMessagePacket(GetNextRequestId(),
request.ToByteString());
try {
QueryFuture future = new SettableFuture <HttpQueryResponse>(state);
Tuple <AsyncCallback, QueryFuture> tuple = Tuple.Create(callback, future);
futures_.Add(request_id_, tuple);
// Send the request and wait for the response. The request should
// follow the REQ/REP pattern, which contains the following parts:
// 1. [EMPTY FRAME]
// 2. [MESSAGE]
//
socket_.SendMore();
socket_.Send(packet.ToByteArray());
return(future);
} catch (ZMQ.Exception zmqe) {
return
(Futures.ImmediateFuture(
GetExceptionResponse(name, HttpStatusCode.InternalServerError, zmqe)));
} catch (System.Exception e) {
return
(Futures.ImmediateFuture(
GetExceptionResponse(name, HttpStatusCode.InternalServerError, e)));
}
}
public IFuture <T> LoadFuture(string key, CacheLoader <T> loader)
{
stopwatch_.Start();
T previous_value = old_value_.Value;
try {
// If the T is a value type and its value is default(T) it will never
// be reloaded and always loaded from the cache loader. We could
// make the parameter T nullable, but this makes the code much more
// complicated and we do not want that.
if (typeof(T).IsValueType || (object)previous_value == null)
{
T new_value = loader.Load(key);
return(Set(new_value) ? this : Futures.ImmediateFuture(new_value));
}
else
{
IFuture <T> new_value_future = loader.Reload(key, previous_value);
return(new_value_future ?? Futures.ImmediateFuture(default(T)));
}
} catch (Exception exception) {
return(SetException(exception)
? this
: Futures.ImmediateFailedFuture <T>(exception));
}
}
public override Future <FileStatus> Load(Path path)
{
try
{
FileSystem fs = path.GetFileSystem(conf);
return(Futures.ImmediateFuture(fs.GetFileStatus(path)));
}
catch (Exception th)
{
// report failures so it can be memoized
return(Futures.ImmediateFailedFuture(th));
}
}
public IAsyncResult BeginProcessRequest(HttpContext context,
AsyncCallback callback, object state)
{
string name = context.Request.QueryString["name"];
if (string.IsNullOrEmpty(name))
{
return(Futures.ImmediateFuture(
new HttpQueryResponse {
Name = string.Empty,
Response = string.Empty,
StatusCode = HttpStatusCode.NotFound
}));
}
IDictionary <string, string> parameters = GetParameters(context);
var app = context
.Application[Strings.kApplicationKey] as HttpQueryApplication;
var async_state = new AsyncState(context.GetHashCode(), context);
IFuture <HttpQueryResponse> result = app.ProcessQuery(name, parameters,
callback, async_state);
// Waits the processing to finish. NOTE that we cannot finish the
// request synchrnously, because that is no way to tell ASP.NET
// that the request has been completed. If we do this a null reference
// exception will be raised when OnAsyncHandlerCompletion runs, because
// the HttpContext associated with the request is already released.
HttpQueryResponse response;
if (result.TryGet(0, TimeUnit.Seconds, out response))
{
callback(result);
return(Futures.ImmediateFuture(0));
}
pending_request_[async_state.ID] = name;
ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle,
(o, @out) => Timeout(@out, callback, result), null,
app.Settings.ResponseTimeout, true);
return(result);
}
/// <summary>
/// Computes or retrieves a replacement value corresponding to an
/// already-cached <paramref name="key"/>.
/// </summary>
/// <param name="key">
/// The non-null key whose value should be loaded.
/// </param>
/// <param name="old_value">
/// The non-null old value corresponding to <see cref="key"/>.
/// </param>
/// <returns>The future new value associated with <see cref="key"/>;
/// must not be or return null(for reference types).</returns>
/// <remarks>
/// This method is called when an existing cache entry is refreshed by
/// <see cref="CacheBuilder{T}.RefreshAfterWrite"/>, or through a call to
/// cache refresh method.
/// <para>
/// This implementation synchronously delegates to <see cref="Load"/>. It
/// is recommended that it be overridden with an asynchronous
/// implementation when using
/// <see cref="CacheBuilder{T}.RefreshAfterWrite"/>.
/// </para>
/// </remarks>
public virtual IFuture <T> Reload(string key, T old_value)
{
return(Futures.ImmediateFuture(Load(key)));
}
internal static Stubber FutureReturns <V>(V value)
{
ListenableFuture <V> ret = Futures.ImmediateFuture(value);
return(Org.Mockito.Mockito.DoReturn(ret));
}
