TaskScheduler: Change Sequence::PeekTask to Sequence::TakeTask.

base/task_scheduler/scheduler_worker_unittest.cc

 // Copyright 2016 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.
 
 #include "base/task_scheduler/scheduler_worker.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <vector>
@@ skipping 28 matching lines @@
 class SchedulerWorkerDefaultDelegate : public SchedulerWorker::Delegate {
  public:
   SchedulerWorkerDefaultDelegate() = default;
 
   // SchedulerWorker::Delegate:
   void OnMainEntry(SchedulerWorker* worker,
                    const TimeDelta& detach_duration) override {}
   scoped_refptr<Sequence> GetWork(SchedulerWorker* worker) override {
     return nullptr;
   }
-  void DidRunTask(const Task* task, const TimeDelta& task_latency) override {
+  void DidRunTask(TaskPriority task_priority,
+                  const TimeDelta& task_latency) override {
     ADD_FAILURE() << "Unexpected call to DidRunTask()";
   }
   void ReEnqueueSequence(scoped_refptr<Sequence> sequence) override {
     ADD_FAILURE() << "Unexpected call to ReEnqueueSequence()";
   }
   TimeDelta GetSleepTimeout() override { return TimeDelta::Max(); }
   bool CanDetach(SchedulerWorker* worker) override { return false; }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SchedulerWorkerDefaultDelegate);
@@ skipping 107 matching lines @@
       scoped_refptr<Sequence> sequence(new Sequence);
       for (size_t i = 0; i < outer_->TasksPerSequence(); ++i) {
         std::unique_ptr<Task> task(new Task(
             FROM_HERE, Bind(&TaskSchedulerWorkerTest::RunTaskCallback,
                             Unretained(outer_)),
             TaskTraits(), TimeDelta()));
         EXPECT_TRUE(outer_->task_tracker_.WillPostTask(task.get()));
         sequence->PushTask(std::move(task));
       }
 
-      ExpectCallToDidRunTask(sequence->PeekTask());
+      ExpectCallToDidRunTask(sequence->GetFrontTaskTraits().priority());
 
       {
         // Add the Sequence to the vector of created Sequences.
         AutoSchedulerLock auto_lock(outer_->lock_);
         outer_->created_sequences_.push_back(sequence);
       }
 
       return sequence;
     }
 
-    void DidRunTask(const Task* task, const TimeDelta& task_latency) override {
+    void DidRunTask(TaskPriority task_priority,
+                    const TimeDelta& task_latency) override {
       AutoSchedulerLock auto_lock(expect_did_run_task_lock_);
-      EXPECT_EQ(expect_did_run_task_, task);
-      expect_did_run_task_ = nullptr;
+      EXPECT_TRUE(expect_did_run_task_);
+      EXPECT_EQ(expect_did_run_task_with_priority_, task_priority);
       EXPECT_FALSE(task_latency.is_max());
+      expect_did_run_task_ = false;
     }
 
     // This override verifies that |sequence| contains the expected number of
     // Tasks and adds it to |enqueued_sequences_|. Unlike a normal
     // EnqueueSequence implementation, it doesn't reinsert |sequence| into a
     // queue for further execution.
     void ReEnqueueSequence(scoped_refptr<Sequence> sequence) override {
       EXPECT_FALSE(IsCallToDidRunTaskExpected());
       EXPECT_GT(outer_->TasksPerSequence(), 1U);
 
       // Verify that |sequence| contains TasksPerSequence() - 1 Tasks.
       for (size_t i = 0; i < outer_->TasksPerSequence() - 1; ++i) {
-        EXPECT_TRUE(sequence->PeekTask());
-        sequence->PopTask();
+        EXPECT_TRUE(sequence->TakeTask());
+        sequence->RemoveFrontSlot();
       }
-      EXPECT_FALSE(sequence->PeekTask());
+      EXPECT_FALSE(sequence->TakeTask());
 
       // Add |sequence| to |re_enqueued_sequences_|.
       AutoSchedulerLock auto_lock(outer_->lock_);
       outer_->re_enqueued_sequences_.push_back(std::move(sequence));
       EXPECT_LE(outer_->re_enqueued_sequences_.size(),
                 outer_->created_sequences_.size());
     }
 
    private:
-    // Expect a call to DidRunTask() with |task| as argument before the next
-    // call to any other method of this delegate.
-    void ExpectCallToDidRunTask(const Task* task) {
+    // Expect a call to DidRunTask() with |task_priority| as argument before the
+    // next call to any other method of this delegate.
+    void ExpectCallToDidRunTask(TaskPriority task_priority) {
       AutoSchedulerLock auto_lock(expect_did_run_task_lock_);
-      expect_did_run_task_ = task;
+      expect_did_run_task_ = true;
+      expect_did_run_task_with_priority_ = task_priority;
     }
 
     bool IsCallToDidRunTaskExpected() const {
       AutoSchedulerLock auto_lock(expect_did_run_task_lock_);
-      return expect_did_run_task_ != nullptr;
+      return expect_did_run_task_;
     }
 
     TaskSchedulerWorkerTest* outer_;
 
-    // Synchronizes access to |expect_did_run_task_|.
+    // Synchronizes access to |expect_did_run_task_| and
+    // |expect_did_run_task_with_priority_|.
     mutable SchedulerLock expect_did_run_task_lock_;
 
-    // Expected task for the next call to DidRunTask(). DidRunTask() should not
-    // be called when this is nullptr. No method other than DidRunTask() should
-    // be called on this delegate when this is not nullptr.
-    const Task* expect_did_run_task_ = nullptr;
+    // When this is true, the next method called on this delegate should be
+    // DidRunTask().
+    bool expect_did_run_task_ = false;
+
+    // Expected priority for the next call to DidRunTask().
+    TaskPriority expect_did_run_task_with_priority_ = TaskPriority::BACKGROUND;
   };
 
   void RunTaskCallback() {
     AutoSchedulerLock auto_lock(lock_);
     ++num_run_tasks_;
     EXPECT_LE(num_run_tasks_, created_sequences_.size());
   }
 
   TaskTracker task_tracker_;
 
@@ skipping 128 matching lines @@
     work_requested_ = true;
     scoped_refptr<Sequence> sequence(new Sequence);
     std::unique_ptr<Task> task(new Task(
         FROM_HERE, Bind(&WaitableEvent::Signal, Unretained(&work_processed_)),
         TaskTraits(), TimeDelta()));
     EXPECT_TRUE(task_tracker_->WillPostTask(task.get()));
     sequence->PushTask(std::move(task));
     return sequence;
   }
 
-  void DidRunTask(const Task* task, const TimeDelta& task_latency) override {}
+  void DidRunTask(TaskPriority task, const TimeDelta& task_latency) override {}
 
   bool CanDetach(SchedulerWorker* worker) override {
     detach_requested_.Signal();
     return can_detach_;
   }
 
   void WaitForWorkToRun() {
     work_processed_.Wait();
   }
 
@@ skipping 192 matching lines @@
   // OnMainEntry() and GetWork() are called.
   worker->WakeUp();
   delegate_raw->WaitForPriorityVerifiedInGetWork();
 
   worker->JoinForTesting();
 }
 
 }  // namespace
 }  // namespace internal
 }  // namespace base