| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef WebTaskRunner_h |
| #define WebTaskRunner_h |
| |
| #include "WebCommon.h" |
| #include "base/callback_forward.h" |
| #include "public/platform/WebTraceLocation.h" |
| #include <memory> |
| |
| #ifdef INSIDE_BLINK |
| #include "wtf/Functional.h" |
| #endif |
| |
| namespace base { |
| class SingleThreadTaskRunner; |
| } |
| |
| namespace blink { |
| |
| using SingleThreadTaskRunner = base::SingleThreadTaskRunner; |
| |
| // The blink representation of a chromium SingleThreadTaskRunner. |
| class BLINK_PLATFORM_EXPORT WebTaskRunner { |
| public: |
| virtual ~WebTaskRunner() {} |
| |
| class BLINK_PLATFORM_EXPORT Task { |
| public: |
| virtual ~Task() {} |
| virtual void run() = 0; |
| }; |
| |
| // Schedule a task to be run on the the associated WebThread. |
| // Takes ownership of |Task|. Can be called from any thread. |
| virtual void postTask(const WebTraceLocation&, Task*) = 0; |
| |
| // Schedule a task to be run after |delayMs| on the the associated WebThread. |
| // Takes ownership of |Task|. Can be called from any thread. |
| virtual void postDelayedTask(const WebTraceLocation&, |
| Task*, |
| double delayMs) = 0; |
| |
| // Schedule a task to be run after |delayMs| on the the associated WebThread. |
| // Can be called from any thread. |
| virtual void postDelayedTask(const WebTraceLocation&, |
| const base::Closure&, |
| double delayMs) = 0; |
| |
| // Returns a clone of the WebTaskRunner. |
| virtual std::unique_ptr<WebTaskRunner> clone() = 0; |
| |
| // Returns true if the current thread is a thread on which a task may be run. |
| // Can be called from any thread. |
| virtual bool runsTasksOnCurrentThread() = 0; |
| |
| // --- |
| |
| // Headless Chrome virtualises time for determinism and performance (fast |
| // forwarding of timers). To make this work some parts of blink (e.g. Timers) |
| // need to use virtual time, however by default new code should use the normal |
| // non-virtual time APIs. |
| |
| // Returns a double which is the number of seconds since epoch (Jan 1, 1970). |
| // This may represent either the real time, or a virtual time depending on |
| // whether or not the WebTaskRunner is associated with a virtual time domain |
| // or a real time domain. |
| virtual double virtualTimeSeconds() const = 0; |
| |
| // Returns a microsecond resolution platform dependant time source. |
| // This may represent either the real time, or a virtual time depending on |
| // whether or not the WebTaskRunner is associated with a virtual time domain |
| // or a real time domain. |
| virtual double monotonicallyIncreasingVirtualTimeSeconds() const = 0; |
| |
| // Returns the underlying task runner object. |
| virtual SingleThreadTaskRunner* toSingleThreadTaskRunner() = 0; |
| |
| #ifdef INSIDE_BLINK |
| // Helpers for posting bound functions as tasks. |
| |
| // For cross-thread posting. Can be called from any thread. |
| void postTask(const WebTraceLocation&, std::unique_ptr<CrossThreadClosure>); |
| void postDelayedTask(const WebTraceLocation&, |
| std::unique_ptr<CrossThreadClosure>, |
| long long delayMs); |
| |
| // For same-thread posting. Must be called from the associated WebThread. |
| void postTask(const WebTraceLocation&, std::unique_ptr<WTF::Closure>); |
| void postDelayedTask(const WebTraceLocation&, |
| std::unique_ptr<WTF::Closure>, |
| long long delayMs); |
| #endif |
| }; |
| |
| } // namespace blink |
| |
| #endif // WebTaskRunner_h |