384 lines
21 KiB
C#
384 lines
21 KiB
C#
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// Copyright (c) Microsoft. All rights reserved.
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// Licensed under the MIT license. See LICENSE file in the project root for full license information.
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// =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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//
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// ActionBlock.cs
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//
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//
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// A target block that executes an action for each message.
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//
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// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Diagnostics.CodeAnalysis;
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using System.Diagnostics.Contracts;
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using System.Runtime.CompilerServices;
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using System.Threading.Tasks.Dataflow.Internal;
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namespace System.Threading.Tasks.Dataflow
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{
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/// <summary>Provides a dataflow block that invokes a provided <see cref="System.Action{T}"/> delegate for every data element received.</summary>
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/// <typeparam name="TInput">Specifies the type of data operated on by this <see cref="ActionBlock{T}"/>.</typeparam>
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[DebuggerDisplay("{DebuggerDisplayContent,nq}")]
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[DebuggerTypeProxy(typeof(ActionBlock<>.DebugView))]
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public sealed class ActionBlock<TInput> : ITargetBlock<TInput>, IDebuggerDisplay
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{
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/// <summary>The core implementation of this message block when in default mode.</summary>
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private readonly TargetCore<TInput> _defaultTarget;
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/// <summary>The core implementation of this message block when in SPSC mode.</summary>
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private readonly SpscTargetCore<TInput> _spscTarget;
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/// <summary>Initializes the <see cref="ActionBlock{T}"/> with the specified <see cref="System.Action{T}"/>.</summary>
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/// <param name="action">The action to invoke with each data element received.</param>
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/// <exception cref="System.ArgumentNullException">The <paramref name="action"/> is null (Nothing in Visual Basic).</exception>
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public ActionBlock(Action<TInput> action) :
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this((Delegate)action, ExecutionDataflowBlockOptions.Default)
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{ }
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/// <summary>Initializes the <see cref="ActionBlock{T}"/> with the specified <see cref="System.Action{T}"/> and <see cref="ExecutionDataflowBlockOptions"/>.</summary>
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/// <param name="action">The action to invoke with each data element received.</param>
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/// <param name="dataflowBlockOptions">The options with which to configure this <see cref="ActionBlock{T}"/>.</param>
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/// <exception cref="System.ArgumentNullException">The <paramref name="action"/> is null (Nothing in Visual Basic).</exception>
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/// <exception cref="System.ArgumentNullException">The <paramref name="dataflowBlockOptions"/> is null (Nothing in Visual Basic).</exception>
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public ActionBlock(Action<TInput> action, ExecutionDataflowBlockOptions dataflowBlockOptions) :
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this((Delegate)action, dataflowBlockOptions)
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{ }
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/// <summary>Initializes the <see cref="ActionBlock{T}"/> with the specified <see cref="System.Func{T,Task}"/>.</summary>
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/// <param name="action">The action to invoke with each data element received.</param>
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/// <exception cref="System.ArgumentNullException">The <paramref name="action"/> is null (Nothing in Visual Basic).</exception>
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public ActionBlock(Func<TInput, Task> action) :
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this((Delegate)action, ExecutionDataflowBlockOptions.Default)
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{ }
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/// <summary>Initializes the <see cref="ActionBlock{T}"/> with the specified <see cref="System.Func{T,Task}"/> and <see cref="ExecutionDataflowBlockOptions"/>.</summary>
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/// <param name="action">The action to invoke with each data element received.</param>
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/// <param name="dataflowBlockOptions">The options with which to configure this <see cref="ActionBlock{T}"/>.</param>
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/// <exception cref="System.ArgumentNullException">The <paramref name="action"/> is null (Nothing in Visual Basic).</exception>
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/// <exception cref="System.ArgumentNullException">The <paramref name="dataflowBlockOptions"/> is null (Nothing in Visual Basic).</exception>
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public ActionBlock(Func<TInput, Task> action, ExecutionDataflowBlockOptions dataflowBlockOptions) :
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this((Delegate)action, dataflowBlockOptions)
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{ }
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/// <summary>Initializes the <see cref="ActionBlock{T}"/> with the specified delegate and options.</summary>
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/// <param name="action">The action to invoke with each data element received.</param>
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/// <param name="dataflowBlockOptions">The options with which to configure this <see cref="ActionBlock{T}"/>.</param>
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/// <exception cref="System.ArgumentNullException">The <paramref name="action"/> is null (Nothing in Visual Basic).</exception>
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/// <exception cref="System.ArgumentNullException">The <paramref name="dataflowBlockOptions"/> is null (Nothing in Visual Basic).</exception>
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private ActionBlock(Delegate action, ExecutionDataflowBlockOptions dataflowBlockOptions)
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{
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// Validate arguments
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if (action == null) throw new ArgumentNullException("action");
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if (dataflowBlockOptions == null) throw new ArgumentNullException("dataflowBlockOptions");
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Contract.Ensures((_spscTarget != null) ^ (_defaultTarget != null), "One and only one of the two targets must be non-null after construction");
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Contract.EndContractBlock();
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// Ensure we have options that can't be changed by the caller
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dataflowBlockOptions = dataflowBlockOptions.DefaultOrClone();
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// Based on the mode, initialize the target. If the user specifies SingleProducerConstrained,
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// we'll try to employ an optimized mode under a limited set of circumstances.
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var syncAction = action as Action<TInput>;
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if (syncAction != null &&
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dataflowBlockOptions.SingleProducerConstrained &&
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dataflowBlockOptions.MaxDegreeOfParallelism == 1 &&
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!dataflowBlockOptions.CancellationToken.CanBeCanceled &&
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dataflowBlockOptions.BoundedCapacity == DataflowBlockOptions.Unbounded)
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{
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// Initialize the SPSC fast target to handle the bulk of the processing.
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// The SpscTargetCore is only supported when BoundedCapacity, CancellationToken,
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// and MaxDOP are all their default values. It's also only supported for sync
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// delegates and not for async delegates.
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_spscTarget = new SpscTargetCore<TInput>(this, syncAction, dataflowBlockOptions);
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}
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else
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{
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// Initialize the TargetCore which handles the bulk of the processing.
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// The default target core can handle all options and delegate flavors.
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if (syncAction != null) // sync
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{
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_defaultTarget = new TargetCore<TInput>(this,
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messageWithId => ProcessMessage(syncAction, messageWithId),
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null, dataflowBlockOptions, TargetCoreOptions.RepresentsBlockCompletion);
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}
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else // async
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{
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var asyncAction = action as Func<TInput, Task>;
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Debug.Assert(asyncAction != null, "action is of incorrect delegate type");
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_defaultTarget = new TargetCore<TInput>(this,
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messageWithId => ProcessMessageWithTask(asyncAction, messageWithId),
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null, dataflowBlockOptions, TargetCoreOptions.RepresentsBlockCompletion | TargetCoreOptions.UsesAsyncCompletion);
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}
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// Handle async cancellation requests by declining on the target
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Common.WireCancellationToComplete(
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dataflowBlockOptions.CancellationToken, Completion, state => ((TargetCore<TInput>)state).Complete(exception: null, dropPendingMessages: true), _defaultTarget);
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}
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#if FEATURE_TRACING
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DataflowEtwProvider etwLog = DataflowEtwProvider.Log;
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if (etwLog.IsEnabled())
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{
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etwLog.DataflowBlockCreated(this, dataflowBlockOptions);
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}
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#endif
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}
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/// <summary>Processes the message with a user-provided action.</summary>
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/// <param name="action">The action to use to process the message.</param>
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/// <param name="messageWithId">The message to be processed.</param>
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private void ProcessMessage(Action<TInput> action, KeyValuePair<TInput, long> messageWithId)
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{
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try
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{
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action(messageWithId.Key);
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}
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catch (Exception exc)
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{
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// If this exception represents cancellation, swallow it rather than shutting down the block.
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if (!Common.IsCooperativeCancellation(exc)) throw;
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}
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finally
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{
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// We're done synchronously processing an element, so reduce the bounding count
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// that was incrementing when this element was enqueued.
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if (_defaultTarget.IsBounded) _defaultTarget.ChangeBoundingCount(-1);
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}
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}
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/// <summary>Processes the message with a user-provided action that returns a task.</summary>
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/// <param name="action">The action to use to process the message.</param>
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/// <param name="messageWithId">The message to be processed.</param>
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[SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes")]
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private void ProcessMessageWithTask(Func<TInput, Task> action, KeyValuePair<TInput, long> messageWithId)
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{
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Contract.Requires(action != null, "action needed for processing");
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// Run the action to get the task that represents the operation's completion
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Task task = null;
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Exception caughtException = null;
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try
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{
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task = action(messageWithId.Key);
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}
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catch (Exception exc) { caughtException = exc; }
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// If no task is available, we're done.
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if (task == null)
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{
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// If we didn't get a task because an exception occurred,
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// store it (if the exception was cancellation, just ignore it).
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if (caughtException != null && !Common.IsCooperativeCancellation(caughtException))
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{
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Common.StoreDataflowMessageValueIntoExceptionData(caughtException, messageWithId.Key);
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_defaultTarget.Complete(caughtException, dropPendingMessages: true, storeExceptionEvenIfAlreadyCompleting: true, unwrapInnerExceptions: false);
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}
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// Signal that we're done this async operation.
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_defaultTarget.SignalOneAsyncMessageCompleted(boundingCountChange: -1);
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return;
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}
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else if (task.IsCompleted)
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{
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AsyncCompleteProcessMessageWithTask(task);
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}
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else
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{
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// Otherwise, join with the asynchronous operation when it completes.
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task.ContinueWith((completed, state) =>
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{
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((ActionBlock<TInput>)state).AsyncCompleteProcessMessageWithTask(completed);
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}, this, CancellationToken.None, Common.GetContinuationOptions(TaskContinuationOptions.ExecuteSynchronously), TaskScheduler.Default);
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}
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}
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/// <summary>Completes the processing of an asynchronous message.</summary>
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/// <param name="completed">The completed task.</param>
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private void AsyncCompleteProcessMessageWithTask(Task completed)
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{
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Contract.Requires(completed != null, "Need completed task for processing");
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Contract.Requires(completed.IsCompleted, "The task to be processed must be completed by now.");
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// If the task faulted, store its errors. We must add the exception before declining
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// and signaling completion, as the exception is part of the operation, and the completion conditions
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// depend on this.
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if (completed.IsFaulted)
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{
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_defaultTarget.Complete(completed.Exception, dropPendingMessages: true, storeExceptionEvenIfAlreadyCompleting: true, unwrapInnerExceptions: true);
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}
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// Regardless of faults, note that we're done processing. There are
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// no outputs to keep track of for action block, so we always decrement
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// the bounding count here (the callee will handle checking whether
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// we're actually in a bounded mode).
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_defaultTarget.SignalOneAsyncMessageCompleted(boundingCountChange: -1);
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}
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/// <include file='XmlDocs/CommonXmlDocComments.xml' path='CommonXmlDocComments/Blocks/Member[@name="Complete"]/*' />
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public void Complete()
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{
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if (_defaultTarget != null)
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{
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_defaultTarget.Complete(exception: null, dropPendingMessages: false);
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}
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else
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{
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_spscTarget.Complete(exception: null);
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}
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}
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/// <include file='XmlDocs/CommonXmlDocComments.xml' path='CommonXmlDocComments/Blocks/Member[@name="Fault"]/*' />
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void IDataflowBlock.Fault(Exception exception)
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{
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if (exception == null) throw new ArgumentNullException("exception");
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Contract.EndContractBlock();
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if (_defaultTarget != null)
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{
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_defaultTarget.Complete(exception, dropPendingMessages: true);
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}
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else
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{
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_spscTarget.Complete(exception);
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}
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}
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/// <include file='XmlDocs/CommonXmlDocComments.xml' path='CommonXmlDocComments/Blocks/Member[@name="Completion"]/*' />
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public Task Completion
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{
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get { return _defaultTarget != null ? _defaultTarget.Completion : _spscTarget.Completion; }
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}
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/// <summary>Posts an item to the <see cref="T:System.Threading.Tasks.Dataflow.ITargetBlock`1"/>.</summary>
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/// <param name="item">The item being offered to the target.</param>
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/// <returns>true if the item was accepted by the target block; otherwise, false.</returns>
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/// <remarks>
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/// This method will return once the target block has decided to accept or decline the item,
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/// but unless otherwise dictated by special semantics of the target block, it does not wait
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/// for the item to actually be processed (for example, <see cref="T:System.Threading.Tasks.Dataflow.ActionBlock`1"/>
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/// will return from Post as soon as it has stored the posted item into its input queue). From the perspective
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/// of the block's processing, Post is asynchronous. For target blocks that support postponing offered messages,
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/// or for blocks that may do more processing in their Post implementation, consider using
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/// <see cref="T:System.Threading.Tasks.Dataflow.DataflowBlock.SendAsync">SendAsync</see>,
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/// which will return immediately and will enable the target to postpone the posted message and later consume it
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/// after SendAsync returns.
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/// </remarks>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public bool Post(TInput item)
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{
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// Even though this method is available with the exact same functionality as an extension method
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// on ITargetBlock, using that extension method goes through an interface call on ITargetBlock,
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// which for very high-throughput scenarios shows up as noticeable overhead on certain architectures.
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// We can eliminate that call for direct ActionBlock usage by providing the same method as an instance method.
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return _defaultTarget != null ?
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_defaultTarget.OfferMessage(Common.SingleMessageHeader, item, null, false) == DataflowMessageStatus.Accepted :
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_spscTarget.Post(item);
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}
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/// <include file='XmlDocs/CommonXmlDocComments.xml' path='CommonXmlDocComments/Targets/Member[@name="OfferMessage"]/*' />
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DataflowMessageStatus ITargetBlock<TInput>.OfferMessage(DataflowMessageHeader messageHeader, TInput messageValue, ISourceBlock<TInput> source, Boolean consumeToAccept)
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{
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return _defaultTarget != null ?
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_defaultTarget.OfferMessage(messageHeader, messageValue, source, consumeToAccept) :
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_spscTarget.OfferMessage(messageHeader, messageValue, source, consumeToAccept);
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}
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/// <include file='XmlDocs/CommonXmlDocComments.xml' path='CommonXmlDocComments/Targets/Member[@name="InputCount"]/*' />
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public int InputCount
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{
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get { return _defaultTarget != null ? _defaultTarget.InputCount : _spscTarget.InputCount; }
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}
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/// <summary>Gets the number of messages waiting to be processed. This must only be used from the debugger.</summary>
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private int InputCountForDebugger
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{
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get { return _defaultTarget != null ? _defaultTarget.GetDebuggingInformation().InputCount : _spscTarget.InputCount; }
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}
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/// <include file='XmlDocs/CommonXmlDocComments.xml' path='CommonXmlDocComments/Blocks/Member[@name="ToString"]/*' />
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public override string ToString()
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{
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return Common.GetNameForDebugger(this, _defaultTarget != null ? _defaultTarget.DataflowBlockOptions : _spscTarget.DataflowBlockOptions);
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}
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/// <summary>The data to display in the debugger display attribute.</summary>
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[SuppressMessage("Microsoft.Globalization", "CA1305:SpecifyIFormatProvider")]
|
|||
|
|
private object DebuggerDisplayContent
|
|||
|
|
{
|
|||
|
|
get
|
|||
|
|
{
|
|||
|
|
return string.Format("{0}, InputCount={1}",
|
|||
|
|
Common.GetNameForDebugger(this, _defaultTarget != null ? _defaultTarget.DataflowBlockOptions : _spscTarget.DataflowBlockOptions),
|
|||
|
|
InputCountForDebugger);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
/// <summary>Gets the data to display in the debugger display attribute for this instance.</summary>
|
|||
|
|
object IDebuggerDisplay.Content { get { return DebuggerDisplayContent; } }
|
|||
|
|
|
|||
|
|
/// <summary>Provides a debugger type proxy for the Call.</summary>
|
|||
|
|
private sealed class DebugView
|
|||
|
|
{
|
|||
|
|
/// <summary>The action block being viewed.</summary>
|
|||
|
|
private readonly ActionBlock<TInput> _actionBlock;
|
|||
|
|
/// <summary>The action block's default target being viewed.</summary>
|
|||
|
|
private readonly TargetCore<TInput>.DebuggingInformation _defaultDebugInfo;
|
|||
|
|
/// <summary>The action block's SPSC target being viewed.</summary>
|
|||
|
|
private readonly SpscTargetCore<TInput>.DebuggingInformation _spscDebugInfo;
|
|||
|
|
|
|||
|
|
/// <summary>Initializes the debug view.</summary>
|
|||
|
|
/// <param name="actionBlock">The target being debugged.</param>
|
|||
|
|
public DebugView(ActionBlock<TInput> actionBlock)
|
|||
|
|
{
|
|||
|
|
Contract.Requires(actionBlock != null, "Need a block with which to construct the debug view.");
|
|||
|
|
_actionBlock = actionBlock;
|
|||
|
|
if (_actionBlock._defaultTarget != null)
|
|||
|
|
{
|
|||
|
|
_defaultDebugInfo = actionBlock._defaultTarget.GetDebuggingInformation();
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
_spscDebugInfo = actionBlock._spscTarget.GetDebuggingInformation();
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>Gets the messages waiting to be processed.</summary>
|
|||
|
|
public IEnumerable<TInput> InputQueue
|
|||
|
|
{
|
|||
|
|
get { return _defaultDebugInfo != null ? _defaultDebugInfo.InputQueue : _spscDebugInfo.InputQueue; }
|
|||
|
|
}
|
|||
|
|
/// <summary>Gets any postponed messages.</summary>
|
|||
|
|
public QueuedMap<ISourceBlock<TInput>, DataflowMessageHeader> PostponedMessages
|
|||
|
|
{
|
|||
|
|
get { return _defaultDebugInfo != null ? _defaultDebugInfo.PostponedMessages : null; }
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>Gets the number of outstanding input operations.</summary>
|
|||
|
|
public Int32 CurrentDegreeOfParallelism
|
|||
|
|
{
|
|||
|
|
get { return _defaultDebugInfo != null ? _defaultDebugInfo.CurrentDegreeOfParallelism : _spscDebugInfo.CurrentDegreeOfParallelism; }
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>Gets the ExecutionDataflowBlockOptions used to configure this block.</summary>
|
|||
|
|
public ExecutionDataflowBlockOptions DataflowBlockOptions
|
|||
|
|
{
|
|||
|
|
get { return _defaultDebugInfo != null ? _defaultDebugInfo.DataflowBlockOptions : _spscDebugInfo.DataflowBlockOptions; }
|
|||
|
|
}
|
|||
|
|
/// <summary>Gets whether the block is declining further messages.</summary>
|
|||
|
|
public bool IsDecliningPermanently
|
|||
|
|
{
|
|||
|
|
get { return _defaultDebugInfo != null ? _defaultDebugInfo.IsDecliningPermanently : _spscDebugInfo.IsDecliningPermanently; }
|
|||
|
|
}
|
|||
|
|
/// <summary>Gets whether the block is completed.</summary>
|
|||
|
|
public bool IsCompleted
|
|||
|
|
{
|
|||
|
|
get { return _defaultDebugInfo != null ? _defaultDebugInfo.IsCompleted : _spscDebugInfo.IsCompleted; }
|
|||
|
|
}
|
|||
|
|
/// <summary>Gets the block's Id.</summary>
|
|||
|
|
public int Id { get { return Common.GetBlockId(_actionBlock); } }
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|