Refactor WorkerPoolCreationArgs to a Read-Only WorkerPoolParams

base/task_scheduler/scheduler_worker_pool_params.h

+// 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.
+
+#ifndef BASE_TASK_SCHEDULER_SCHEDULER_WORKER_POOL_PARAMS_H_
+#define BASE_TASK_SCHEDULER_SCHEDULER_WORKER_POOL_PARAMS_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "base/threading/platform_thread.h"
+
+namespace base {
+namespace internal {
+
+class BASE_EXPORT SchedulerWorkerPoolParams final {
+ public:
+  enum class IORestriction {
+    ALLOWED,
+    DISALLOWED,
+  };
+
+  // Construct a scheduler worker pool parameter object that instructs a
+  // scheduler worker pool to use the label |name| and create up to
+  // |max_threads| threads of priority |thread_priority|. |io_restriction|
+  // indicates whether Tasks on the scheduler worker pool are allowed to make
+  // I/O calls.
+  SchedulerWorkerPoolParams(
+      const std::string& name,
+      ThreadPriority thread_priority,
+      IORestriction io_restriction,
+      int max_threads);
+  SchedulerWorkerPoolParams(SchedulerWorkerPoolParams&& other);
+  SchedulerWorkerPoolParams& operator=(SchedulerWorkerPoolParams&& other);
+
+  // Name of the pool. Used to label the pool's threads.
+  const std::string& name() const { return name_; }
+
+  // Priority of the pool's threads.
+  ThreadPriority thread_priority() const { return thread_priority_; }
+
+  // Whether I/O is allowed in the pool.
+  IORestriction io_restriction() const { return io_restriction_; }
+
+  // Maximum number of threads in the pool.
+  size_t max_threads() const { return max_threads_; }
+
+ private:
+  std::string name_;
+  ThreadPriority thread_priority_;
+  IORestriction io_restriction_;
+  size_t max_threads_;
+
+  DISALLOW_COPY_AND_ASSIGN(SchedulerWorkerPoolParams);
+};
+
+}  // namespace internal
+}  // namespace base
+
+#endif  // BASE_TASK_SCHEDULER_SCHEDULER_WORKER_POOL_PARAMS_H_