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// Copyright 2013 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_SYSTEM_SIMPLE_DISPATCHER_H_
#define MOJO_SYSTEM_SIMPLE_DISPATCHER_H_
#include <list>
#include "base/basictypes.h"
#include "mojo/system/dispatcher.h"
#include "mojo/system/system_impl_export.h"
#include "mojo/system/waiter_list.h"
namespace mojo {
namespace system {
// A base class for simple dispatchers. "Simple" means that there's a one-to-one
// correspondence between handles and dispatchers (see the explanatory comment
// in core_impl.cc). This class implements the standard waiter-signalling
// mechanism in that case.
class MOJO_SYSTEM_IMPL_EXPORT SimpleDispatcher : public Dispatcher {
protected:
SimpleDispatcher();
virtual ~SimpleDispatcher();
// To be called by subclasses when the state changes (so
// |SatisfiedFlagsNoLock()| and |SatisfiableFlagsNoLock()| should be checked
// again). Must be called under lock.
void StateChangedNoLock();
// These should return the wait flags that are satisfied by the object's
// current state and those that may eventually be satisfied by this object's
// state, respectively. They should be overridden by subclasses to reflect
// their notion of state. They are never called after the dispatcher has been
// closed. They are called under |lock_|.
virtual MojoWaitFlags SatisfiedFlagsNoLock() const = 0;
virtual MojoWaitFlags SatisfiableFlagsNoLock() const = 0;
// |Dispatcher| protected methods:
virtual void CancelAllWaitersNoLock() OVERRIDE;
virtual MojoResult AddWaiterImplNoLock(Waiter* waiter,
MojoWaitFlags flags,
MojoResult wake_result) OVERRIDE;
virtual void RemoveWaiterImplNoLock(Waiter* waiter) OVERRIDE;
private:
// Protected by |lock()|:
WaiterList waiter_list_;
DISALLOW_COPY_AND_ASSIGN(SimpleDispatcher);
};
} // namespace system
} // namespace mojo
#endif // MOJO_SYSTEM_SIMPLE_DISPATCHER_H_
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