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// Copyright 2014 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 MOJO_PUBLIC_CPP_ENVIRONMENT_ENVIRONMENT_H_
#define MOJO_PUBLIC_CPP_ENVIRONMENT_ENVIRONMENT_H_
#include "mojo/public/cpp/system/macros.h"
struct MojoAsyncWaiter;
struct MojoLogger;
namespace mojo {
struct TaskTracker;
// Other parts of the Mojo C++ APIs use the *static* methods of this class.
//
// The "standalone" implementation of this class requires that this class (in
// the lib/ subdirectory) be instantiated (and remain so) while using the Mojo
// C++ APIs. I.e., the static methods depend on things set up by the constructor
// and torn down by the destructor.
//
// Other implementations may not have this requirement.
class Environment {
public:
Environment();
// This constructor allows the standard implementations to be overridden (set
// a parameter to null to get the standard implementation).
Environment(const MojoAsyncWaiter* default_async_waiter,
const MojoLogger* default_logger,
const TaskTracker* default_task_tracker);
~Environment();
static const MojoAsyncWaiter* GetDefaultAsyncWaiter();
static const MojoLogger* GetDefaultLogger();
static const TaskTracker* GetDefaultTaskTracker();
// These instantiate and destroy an environment-specific run loop for the
// current thread, allowing |GetDefaultAsyncWaiter()| to be used. (The run
// loop itself should be accessible via thread-local storage, using methods
// specific to the run loop implementation.) Creating and destroying nested
// run loops is not supported.
static void InstantiateDefaultRunLoop();
static void DestroyDefaultRunLoop();
private:
MOJO_DISALLOW_COPY_AND_ASSIGN(Environment);
};
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_ENVIRONMENT_ENVIRONMENT_H_
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