/
TransformManyBlock.cs
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/
TransformManyBlock.cs
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// TransformManyBlock.cs
//
// Copyright (c) 2011 Jérémie "garuma" Laval
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
//
using System;
using System.Threading.Tasks;
using System.Collections.Generic;
using System.Collections.Concurrent;
namespace System.Threading.Tasks.Dataflow
{
public sealed class TransformManyBlock<TInput, TOutput> :
IPropagatorBlock<TInput, TOutput>, ITargetBlock<TInput>, IDataflowBlock, ISourceBlock<TOutput>, IReceivableSourceBlock<TOutput>
{
static readonly ExecutionDataflowBlockOptions defaultOptions = new ExecutionDataflowBlockOptions ();
CompletionHelper compHelper = CompletionHelper.GetNew ();
BlockingCollection<TInput> messageQueue = new BlockingCollection<TInput> ();
MessageBox<TInput> messageBox;
MessageVault<TOutput> vault;
ExecutionDataflowBlockOptions dataflowBlockOptions;
readonly Func<TInput, IEnumerable<TOutput>> transformer;
MessageOutgoingQueue<TOutput> outgoing;
TargetBuffer<TOutput> targets = new TargetBuffer<TOutput> ();
DataflowMessageHeader headers = DataflowMessageHeader.NewValid ();
public TransformManyBlock (Func<TInput, IEnumerable<TOutput>> transformer) : this (transformer, defaultOptions)
{
}
public TransformManyBlock (Func<TInput, IEnumerable<TOutput>> transformer, ExecutionDataflowBlockOptions dataflowBlockOptions)
{
if (dataflowBlockOptions == null)
throw new ArgumentNullException ("dataflowBlockOptions");
this.transformer = transformer;
this.dataflowBlockOptions = dataflowBlockOptions;
this.messageBox = new ExecutingMessageBox<TInput> (messageQueue,
compHelper,
() => outgoing.IsCompleted,
TransformProcess,
dataflowBlockOptions);
this.outgoing = new MessageOutgoingQueue<TOutput> (compHelper, () => messageQueue.IsCompleted);
this.vault = new MessageVault<TOutput> ();
}
public DataflowMessageStatus OfferMessage (DataflowMessageHeader messageHeader,
TInput messageValue,
ISourceBlock<TInput> source,
bool consumeToAccept)
{
return messageBox.OfferMessage (this, messageHeader, messageValue, source, consumeToAccept);
}
public IDisposable LinkTo (ITargetBlock<TOutput> target, bool unlinkAfterOne)
{
var result = targets.AddTarget (target, unlinkAfterOne);
outgoing.ProcessForTarget (target, this, false, ref headers);
return result;
}
public TOutput ConsumeMessage (DataflowMessageHeader messageHeader, ITargetBlock<TOutput> target, out bool messageConsumed)
{
return vault.ConsumeMessage (messageHeader, target, out messageConsumed);
}
public void ReleaseReservation (DataflowMessageHeader messageHeader, ITargetBlock<TOutput> target)
{
vault.ReleaseReservation (messageHeader, target);
}
public bool ReserveMessage (DataflowMessageHeader messageHeader, ITargetBlock<TOutput> target)
{
return vault.ReserveMessage (messageHeader, target);
}
public bool TryReceive (Predicate<TOutput> filter, out TOutput item)
{
return outgoing.TryReceive (filter, out item);
}
public bool TryReceiveAll (out IList<TOutput> items)
{
return outgoing.TryReceiveAll (out items);
}
void TransformProcess ()
{
ITargetBlock<TOutput> target;
TInput input;
while (messageQueue.TryTake (out input)) {
foreach (var item in transformer (input)) {
if ((target = targets.Current) != null)
target.OfferMessage (headers.Increment (), item, this, false);
else
outgoing.AddData (item);
}
}
if (!outgoing.IsEmpty && (target = targets.Current) != null)
outgoing.ProcessForTarget (target, this, false, ref headers);
}
public void Complete ()
{
messageBox.Complete ();
}
public void Fault (Exception ex)
{
compHelper.Fault (ex);
}
public Task Completion {
get {
return compHelper.Completion;
}
}
public int OutputCount {
get {
return outgoing.Count;
}
}
public int InputCount {
get {
return messageQueue.Count;
}
}
}
}