协同图形图像编辑系统中对象锁与区域锁的并行

在分布式协同编辑系统中,为了防止并行操作中出现冲突,常常用到加锁的机制.分布式协同图形图像编辑系统是协同系统中一个特殊的类,因此有特殊的加锁方式.本文提出一种新的不但能够给对象加锁,而且能够给区域加锁的锁机制.在这种锁机制下,用户可以自由地选择给一个图案对象加锁或者给一个工作区域加锁.这是一种细粒度和粗粒度的结合,既有利于减少加锁时系统的负载,又有利于方便用户的操作.这个机制已经应用在我们的CoDesign系统.

Combination of Object Lock and Region Lock in Object Based Collaborative Graphics/Image Editing Systems

Locking is a common technique in distributed editing system used to prevent conflicting, maintain user intention and maintain result consistency, Object-based distributed cooperative graphics/image editing systems are a special class, thus have them special locking scheme. In this paper, a novel hybrid scheme for object lock and region lock is proposed. In the proposed scheme, user could freely lock a graphics object or lock a region. Therefore, this is a combination of fine-grain locking and coarse-grain locking, thus not only saving the burden of system used to transfer unnecessary or un-sensitive data, but also making a convenience for users to select. The proposed scheme has been implemented in our CoDesign system.