// Copyright © 2020 The CefSharp Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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using System;
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using System.Collections.Generic;
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using System.Threading;
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namespace CefSharp.DevTools
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{
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// Helper class for setting the method response in the correct sync context
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internal struct DevToolsMethodResponseContext
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{
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public readonly Type Type;
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private readonly Func<object, bool> setResult;
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private readonly Func<Exception, bool> setException;
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private readonly SynchronizationContext syncContext;
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public DevToolsMethodResponseContext(Type type, Func<object, bool> setResult, Func<Exception, bool> setException, SynchronizationContext syncContext)
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{
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Type = type;
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this.setResult = setResult;
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this.setException = setException;
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this.syncContext = syncContext;
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}
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public void SetResult(object result)
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{
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InvokeOnSyncContext(setResult, result);
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}
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public void SetException(Exception ex)
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{
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InvokeOnSyncContext(setException, ex);
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}
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private void InvokeOnSyncContext<T>(Func<T, bool> fn, T value)
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{
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if (syncContext == null || syncContext == SynchronizationContext.Current)
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{
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fn(value);
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}
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else
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{
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// Using a KeyValuePair to pass the method and value into the callback to avoid capturing local variables in the delegate.
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syncContext.Post(new SendOrPostCallback(state =>
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{
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var kv = (KeyValuePair<Func<T, bool>, T>)state;
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kv.Key(kv.Value);
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}), new KeyValuePair<Func<T, bool>, T>(fn, value));
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}
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}
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}
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}
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