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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_EDK_SYSTEM_MESSAGE_IN_TRANSIT_QUEUE_H_
#define MOJO_EDK_SYSTEM_MESSAGE_IN_TRANSIT_QUEUE_H_
#include <stddef.h>
#include <deque>
#include "base/memory/scoped_ptr.h"
#include "mojo/edk/system/message_in_transit.h"
#include "mojo/edk/system/system_impl_export.h"
#include "mojo/public/cpp/system/macros.h"
namespace mojo {
namespace edk {
// A simple queue for |MessageInTransit|s (that owns its messages).
// This class is not thread-safe.
class MOJO_SYSTEM_IMPL_EXPORT MessageInTransitQueue {
public:
MessageInTransitQueue();
~MessageInTransitQueue();
bool IsEmpty() const { return queue_.empty(); }
size_t Size() const { return queue_.size(); }
void AddMessage(scoped_ptr<MessageInTransit> message) {
queue_.push_back(message.release());
}
scoped_ptr<MessageInTransit> GetMessage() {
MessageInTransit* rv = queue_.front();
queue_.pop_front();
return make_scoped_ptr(rv);
}
const MessageInTransit* PeekMessage() const { return queue_.front(); }
MessageInTransit* PeekMessage() { return queue_.front(); }
void DiscardMessage() {
delete queue_.front();
queue_.pop_front();
}
void Clear();
// Efficiently swaps contents with |*other|.
void Swap(MessageInTransitQueue* other);
private:
// TODO(vtl): When C++11 is available, switch this to a deque of
// |scoped_ptr|/|unique_ptr|s.
std::deque<MessageInTransit*> queue_;
MOJO_DISALLOW_COPY_AND_ASSIGN(MessageInTransitQueue);
};
} // namespace edk
} // namespace mojo
#endif // MOJO_EDK_SYSTEM_MESSAGE_IN_TRANSIT_QUEUE_H_
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