2019-02-02 09:12:00 +00:00
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#region CPL License
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/*
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Nuclex Framework
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Copyright (C) 2002-2019 Nuclex Development Labs
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This library is free software; you can redistribute it and/or
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modify it under the terms of the IBM Common Public License as
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published by the IBM Corporation; either version 1.0 of the
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License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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IBM Common Public License for more details.
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You should have received a copy of the IBM Common Public
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License along with this library
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*/
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#endregion
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#if !NO_CONCURRENT_COLLECTIONS
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using System;
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using System.Collections.Concurrent;
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using System.Diagnostics;
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using System.Threading;
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using System.Threading.Tasks;
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namespace Nuclex.Support.Threading {
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/// <summary>Executes actions in a threads</summary>
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public abstract class ThreadRunner : IDisposable {
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#region interface IRunner
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/// <summary>Interface for a background task runner</summary>
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private interface IRunner {
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/// <summary>Runs the background task</summary>
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void Run();
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/// <summary>The runner's cancellation token source</summary>
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CancellationTokenSource CancellationTokenSource { get; }
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}
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#endregion // interface IRunner
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#region struct Runner
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/// <summary>Runs a background task with no parameters</summary>
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private struct Runner : IRunner {
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/// <summary>Initializes a new runner</summary>
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/// <param name="action">Action the runner will execute</param>
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public Runner(Action action) {
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this.action = action;
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}
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/// <summary>Executes the runner's action</summary>
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public void Run() {
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this.action();
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}
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/// <summary>The runner's cancellation token source</summary>
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public CancellationTokenSource CancellationTokenSource {
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get { return null; }
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}
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/// <summary>Action the runner will execute</summary>
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private Action action;
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}
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#endregion // struct Runner
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#region struct CancellableRunner
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/// <summary>Runs a background task with no parameters</summary>
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private struct CancellableRunner : IRunner {
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/// <summary>Initializes a new runner</summary>
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/// <param name="action">Action the runner will execute</param>
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public CancellableRunner(CancellableAction action) {
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this.action = action;
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this.cancellationTokenSource = new CancellationTokenSource();
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}
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/// <summary>Executes the runner's action</summary>
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public void Run() {
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this.action(this.cancellationTokenSource.Token);
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}
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/// <summary>The runner's cancellation token source</summary>
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public CancellationTokenSource CancellationTokenSource {
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get { return this.cancellationTokenSource; }
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}
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/// <summary>The runner's cancellation token source</summary>
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private CancellationTokenSource cancellationTokenSource;
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/// <summary>Action the runner will execute</summary>
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private CancellableAction action;
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}
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#endregion // struct CancellableRunner
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#region struct Runner<P1>
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/// <summary>Runs a background task with one parameter</summary>
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private struct Runner<P1> : IRunner {
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/// <summary>Initializes a new runner</summary>
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/// <param name="action">Action the runner will execute</param>
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/// <param name="parameter1">Parameter that will be passed to the action</param>
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public Runner(Action<P1> action, P1 parameter1) {
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this.action = action;
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this.parameter1 = parameter1;
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}
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/// <summary>Executes the runner's action</summary>
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public void Run() {
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this.action(this.parameter1);
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}
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/// <summary>The runner's cancellation token source</summary>
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public CancellationTokenSource CancellationTokenSource {
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get { return null; }
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}
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/// <summary>Action the runner will execute</summary>
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private Action<P1> action;
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/// <summary>Parameter that will be passed to the action</summary>
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private P1 parameter1;
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}
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#endregion // struct Runner<P1>
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#region struct CancellableRunner<P1>
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/// <summary>Runs a background task with one parameter</summary>
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private struct CancellableRunner<P1> : IRunner {
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/// <summary>Initializes a new runner</summary>
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/// <param name="action">Action the runner will execute</param>
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/// <param name="parameter1">Parameter that will be passed to the action</param>
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public CancellableRunner(CancellableAction<P1> action, P1 parameter1) {
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this.action = action;
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this.parameter1 = parameter1;
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this.cancellationTokenSource = new CancellationTokenSource();
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}
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/// <summary>Executes the runner's action</summary>
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public void Run() {
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this.action(this.parameter1, this.cancellationTokenSource.Token);
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}
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/// <summary>The runner's cancellation token source</summary>
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public CancellationTokenSource CancellationTokenSource {
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get { return this.cancellationTokenSource; }
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}
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/// <summary>The runner's cancellation token source</summary>
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private CancellationTokenSource cancellationTokenSource;
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/// <summary>Action the runner will execute</summary>
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private CancellableAction<P1> action;
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/// <summary>Parameter that will be passed to the action</summary>
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private P1 parameter1;
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}
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#endregion // struct CancellableRunner<P1>
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#region struct Runner<P1, P2>
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/// <summary>Runs a background task with one parameter</summary>
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private struct Runner<P1, P2> : IRunner {
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/// <summary>Initializes a new runner</summary>
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/// <param name="action">Action the runner will execute</param>
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/// <param name="parameter1">First parameter that will be passed to the action</param>
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/// <param name="parameter2">Second parameter that will be passed to the action</param>
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public Runner(Action<P1, P2> action, P1 parameter1, P2 parameter2) {
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this.action = action;
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this.parameter1 = parameter1;
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this.parameter2 = parameter2;
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}
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/// <summary>Executes the runner's action</summary>
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public void Run() {
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this.action(this.parameter1, this.parameter2);
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}
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/// <summary>The runner's cancellation token source</summary>
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public CancellationTokenSource CancellationTokenSource {
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get { return null; }
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}
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/// <summary>Action the runner will execute</summary>
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private Action<P1, P2> action;
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/// <summary>First parameter that will be passed to the action</summary>
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private P1 parameter1;
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/// <summary>Second parameter that will be passed to the action</summary>
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private P2 parameter2;
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}
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#endregion // struct Runner<P1, P2>
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#region struct CancellableRunner<P1, P2>
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/// <summary>Runs a background task with one parameter</summary>
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private struct CancellableRunner<P1, P2> : IRunner {
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/// <summary>Initializes a new runner</summary>
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/// <param name="action">Action the runner will execute</param>
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/// <param name="parameter1">First parameter that will be passed to the action</param>
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/// <param name="parameter2">Second parameter that will be passed to the action</param>
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public CancellableRunner(CancellableAction<P1, P2> action, P1 parameter1, P2 parameter2) {
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this.action = action;
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this.parameter1 = parameter1;
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this.parameter2 = parameter2;
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this.cancellationTokenSource = new CancellationTokenSource();
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}
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/// <summary>Executes the runner's action</summary>
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public void Run() {
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this.action(this.parameter1, this.parameter2, this.cancellationTokenSource.Token);
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}
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/// <summary>The runner's cancellation token source</summary>
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public CancellationTokenSource CancellationTokenSource {
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get { return this.cancellationTokenSource; }
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}
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/// <summary>The runner's cancellation token source</summary>
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private CancellationTokenSource cancellationTokenSource;
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/// <summary>Action the runner will execute</summary>
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private CancellableAction<P1, P2> action;
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/// <summary>First parameter that will be passed to the action</summary>
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private P1 parameter1;
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/// <summary>Second parameter that will be passed to the action</summary>
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private P2 parameter2;
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}
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#endregion // struct CancellableRunner<P1, P2>
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/// <summary>Initializes a new background processing handler</summary>
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public ThreadRunner() {
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this.executeQueuedRunnersInThreadDelegate = new Action(executeQueuedRunnersInThread);
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this.queuedRunners = new ConcurrentQueue<IRunner>();
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}
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/// <summary>
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/// Immediately cancels all operations and releases the resources used by the instance
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/// </summary>
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public void Dispose() {
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Dispose(timeoutMilliseconds: 2500);
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}
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/// <summary>
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/// Immediately cancels all operations and releases the resources used by the instance
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/// </summary>
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/// <param name="timeoutMilliseconds">
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/// Time to wait for the background tasks before dropping the tasks unfinished
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/// </param>
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public void Dispose(int timeoutMilliseconds) {
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CancelAllBackgroundOperations();
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Task currentTask;
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lock(this) {
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currentTask = this.currentTask;
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}
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if(currentTask != null) {
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if(!currentTask.Wait(timeoutMilliseconds)) {
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Debug.Assert(false, "Task does not support cancellation or did not cancel in time");
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}
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lock(this) {
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this.currentTask = null;
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IsBusy = false;
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}
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}
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}
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/// <summary>Whether the view model is currently busy executing a task</summary>
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public bool IsBusy {
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get { return this.isBusy; }
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private set {
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if(value != this.isBusy) {
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this.isBusy = value;
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BusyChanged();
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}
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}
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}
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/// <summary>Reports an error</summary>
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/// <param name="exception">Error that will be reported</param>
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protected abstract void ReportError(Exception exception);
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/// <summary>Called when the status of the busy flag changes</summary>
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protected abstract void BusyChanged();
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/// <summary>Executes the specified operation in the background</summary>
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/// <param name="action">Action that will be executed in the background</param>
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public void RunInBackground(Action action) {
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this.queuedRunners.Enqueue(new Runner(action));
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startBackgroundProcessingIfNecessary();
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}
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/// <summary>Executes the specified operation in the background</summary>
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/// <param name="action">Action that will be executed in the background</param>
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public void RunInBackground(CancellableAction action) {
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this.queuedRunners.Enqueue(new CancellableRunner(action));
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startBackgroundProcessingIfNecessary();
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}
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/// <summary>Executes the specified operation in the background</summary>
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/// <param name="action">Action that will be executed in the background</param>
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/// <param name="parameter1">Parameter that will be passed to the action</param>
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public void RunInBackground<P1>(Action<P1> action, P1 parameter1) {
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this.queuedRunners.Enqueue(new Runner<P1>(action, parameter1));
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startBackgroundProcessingIfNecessary();
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}
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/// <summary>Executes the specified operation in the background</summary>
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/// <param name="action">Action that will be executed in the background</param>
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/// <param name="parameter1">Parameter that will be passed to the action</param>
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public void RunInBackground<P1>(CancellableAction<P1> action, P1 parameter1) {
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this.queuedRunners.Enqueue(new CancellableRunner<P1>(action, parameter1));
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startBackgroundProcessingIfNecessary();
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}
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/// <summary>Executes the specified operation in the background</summary>
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/// <param name="action">Action that will be executed in the background</param>
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/// <param name="parameter1">First parameter that will be passed to the action</param>
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/// <param name="parameter2">Second parameter that will be passed to the action</param>
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public void RunInBackground<P1, P2>(Action<P1, P2> action, P1 parameter1, P2 parameter2) {
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this.queuedRunners.Enqueue(new Runner<P1, P2>(action, parameter1, parameter2));
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startBackgroundProcessingIfNecessary();
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}
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/// <summary>Executes the specified operation in the background</summary>
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/// <param name="action">Action that will be executed in the background</param>
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/// <param name="parameter1">First parameter that will be passed to the action</param>
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/// <param name="parameter2">Second parameter that will be passed to the action</param>
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public void RunInBackground<P1, P2>(
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CancellableAction<P1, P2> action, P1 parameter1, P2 parameter2
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) {
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this.queuedRunners.Enqueue(new CancellableRunner<P1, P2>(action, parameter1, parameter2));
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startBackgroundProcessingIfNecessary();
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}
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/// <summary>Cancels the currently running background operation</summary>
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public void CancelBackgroundOperation() {
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IRunner currentRunner = this.currentRunner;
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if(currentRunner != null) {
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CancellationTokenSource cancellationTokenSource = currentRunner.CancellationTokenSource;
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if(cancellationTokenSource != null) {
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cancellationTokenSource.Cancel();
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}
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}
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}
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/// <summary>Cancels all queued and the currently running background operation</summary>
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public void CancelAllBackgroundOperations() {
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IRunner runner;
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while(this.queuedRunners.TryDequeue(out runner)) {
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CancellationTokenSource cancellationTokenSource = runner.CancellationTokenSource;
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if(cancellationTokenSource != null) {
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cancellationTokenSource.Cancel();
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}
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}
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CancelBackgroundOperation();
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}
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/// <summary>Whether the background operation has been cancelled</summary>
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//[Obsolete("Please use a method accepting a cancellation token instead of using this")]
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public bool IsBackgroundOperationCancelled {
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get {
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IRunner currentRunner = this.currentRunner;
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if(currentRunner != null) {
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return currentRunner.CancellationTokenSource.IsCancellationRequested;
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} else {
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return false;
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}
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}
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}
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/// <summary>Throws an exception if the background operation was cancelled</summary>
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//[Obsolete("Please use a method accepting a cancellation token instead of using this")]
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public void ThrowIfBackgroundOperationCancelled() {
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IRunner currentRunner = this.currentRunner;
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if(currentRunner != null) {
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2019-02-08 18:27:15 +00:00
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CancellationTokenSource source = currentRunner.CancellationTokenSource;
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if(source != null) {
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source.Token.ThrowIfCancellationRequested();
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}
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2019-02-06 07:00:27 +00:00
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}
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}
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/// <summary>Executes the queued runners in the background</summary>
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private void executeQueuedRunnersInThread() {
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IsBusy = true;
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IRunner runner;
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while(this.queuedRunners.TryDequeue(out runner)) {
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try {
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this.currentRunner = runner;
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runner.Run();
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}
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catch(OperationCanceledException) {
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// Ignore
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}
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catch(Exception exception) {
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this.currentRunner = null; // When the error is reported this should already be null
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ReportError(exception);
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}
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this.currentRunner = null;
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}
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lock(this) {
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this.currentTask = null;
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IsBusy = false;
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}
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}
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/// <summary>Starts the background processing thread, if needed</summary>
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private void startBackgroundProcessingIfNecessary() {
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Task currentTask;
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lock(this) {
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if(this.currentTask == null) {
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currentTask = new Task(this.executeQueuedRunnersInThreadDelegate);
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this.currentTask = currentTask;
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} else {
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return; // Task is already running
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}
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}
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// Start the task outside of the lock statement so that when the thread starts to run,
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// it is guaranteed to read the currentTask variable as the task we just created.
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currentTask.Start();
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}
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/// <summary>Whether the view model is currently busy executing a task</summary>
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|
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private volatile bool isBusy;
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/// <summary>Delegate for the executedQueuedRunnersInThread() method</summary>
|
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|
|
private Action executeQueuedRunnersInThreadDelegate;
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|
|
/// <summary>Queued background operations</summary>
|
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|
|
private ConcurrentQueue<IRunner> queuedRunners;
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/// <summary>Runner currently executing in the background</summary>
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|
|
private volatile IRunner currentRunner;
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/// <summary>Task that is currently executing the runners</summary>
|
|
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|
|
private Task currentTask;
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|
}
|
2019-02-02 09:12:00 +00:00
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} // namespace Nuclex.Support.Threading
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#endif // !NO_CONCURRENT_COLLECTIONS
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