Database system employing polymorphic entry and entry matching
    5.
    发明授权
    Database system employing polymorphic entry and entry matching 失效
    数据库系统采用多态条目和条目匹配

    公开(公告)号:US6032151A

    公开(公告)日:2000-02-29

    申请号:US971529

    申请日:1997-11-17

    IPC分类号: G06F9/445 G06F17/30

    摘要: A database system wherein one or more entry databases store a plurality of entries. Each entry is of a given type that defines the fields of the entry. Each of the fields contains or identifies an object with associated attributes or data. The type of each entry may further define behavior in the form of methods the entry is configured to implement. An entry type which is a subtype of another inherits all of the fields and behavior of its supertype, and contains additional fields and/or defines new/modified behavior. Entries may be expressed in a Java.TM. class of the Java.TM. programming language. The database system may further employ a search engine which allows queries to be made upon entries in the database. In one implementation, the queries include a read operation, a take operation, and a notify operation. Each query request includes a command indicating the type of operation, and a template which is an entry object having some or all of its fields set to specified values that must be matched exactly. Other fields of the template entry may be specified as wildcards, whose values do not matter. The search engine may further be configured to create an index for entries having characteristics which are commonly specified by queries. Thus, the search engine may detect a pattern of usage and create an index which points to entries having attributes which are commonly specified by received templates. In this manner, expedient entry searching may be accommodated.

    摘要翻译: 数据库系统,其中一个或多个条目数据库存储多个条目。 每个条目都是给定类型,用于定义条目的字段。 每个字段包含或标识具有关联属性或数据的对象。 每个条目的类型可以进一步以条目被配置为实现的方式的形式定义行为。 作为另一个子类型的条目类型继承其超类型的所有字段和行为,并包含其他字段和/或定义新的/修改的行为。 条目可以在Java TM编程语言的Java TM类中表示。 数据库系统还可以采用允许在数据库中的条目进行查询的搜索引擎。 在一个实现中,查询包括读操作,执行操作和通知操作。 每个查询请求包括指示操作类型的命令,以及作为条目对象的模板,其中的一些或所有字段被设置为必须精确匹配的指定值。 模板条目的其他字段可以指定为通配符,其值无关紧要。 搜索引擎还可以被配置为为具有通常由查询指定的特征的条目创建索引。 因此,搜索引擎可以检测使用模式并创建指向具有由接收的模板通常指定的属性的条目的索引。 以这种方式,可以适应有利的条目搜索。

    Method and apparatus for dynamic distributed computing over a network
    7.
    发明授权
    Method and apparatus for dynamic distributed computing over a network 失效
    通过网络进行动态分布式计算的方法和装置

    公开(公告)号:US06446070B1

    公开(公告)日:2002-09-03

    申请号:US09030840

    申请日:1998-02-26

    IPC分类号: G06F900

    摘要: A homogeneous execution environment operates within a heterogeneous client-server network. A client selects a server and transmits a procedure call with parameters. In response, the system dynamically and securely downloads code to a compute server; invokes a generic compute method; executes the code on the compute server; and returns the results to the calling client method, preserving the result on the compute server if requested. This technique is efficient in that it does not require multiple copies of code to be downloaded or compiled since server byte-codes can be executed on each of the different systems. The code can be compiled once and downloaded as needed to the various servers as byte-codes and then executed.

    摘要翻译: 均匀的执行环境在异构的客户端 - 服务器网络内运行。 客户端选择一个服务器并发送具有参数的过程调用。 作为响应,系统动态安全地将代码下载到计算服务器; 调用通用计算方法; 执行计算服务器上的代码; 并将结果返回给调用客户端方法,如果请求,则在计算服务器上保留结果。 这种技术是有效的,因为不需要下载或编译多个代码副本,因为可以在每个不同的系统上执行服务器字节码。 代码可以编译一次,并根据需要下载到各种服务器作为字节代码,然后执行。

    Method and system for leasing storage
    9.
    发明授权
    Method and system for leasing storage 失效
    租赁存储方法和系统

    公开(公告)号:US06263350B1

    公开(公告)日:2001-07-17

    申请号:US09044923

    申请日:1998-03-20

    IPC分类号: G06F1730

    摘要: A method and system for leasing storage locations in a distributed processing system is provided. Consistent with this method and system, a client requests access to storage locations for a period of time (lease period) from a server, such as the file system manager. Responsive to this request, the server invokes a lease period algorithm, which considers various factors to determine a lease period during which time the client may access the storage locations. After a lease is granted, the server sends an object to the client that advises the client of the lease period and that provides the client with behavior to modify the lease, like canceling the lease or renewing the lease. The server supports concurrent leases, exact leases, and leases for various types of access. After all leases to a storage location expire, the server reclaims the storage location.

    摘要翻译: 提供了一种在分布式处理系统中租赁存储位置的方法和系统。 与该方法和系统一致,客户机从服务器(例如文件系统管理器)请求对存储位置的访问一段时间(租赁期)。 响应于该请求,服务器调用租约期算法,该算法考虑各种因素来确定客户端可以访问存储位置的租期。 授予租赁后,服务器向客户端发送一个对客户建议租约期的对象,并向客户提供修改租约的行为,如取消租约或更新租约。 服务器支持各种类型的访问的并发租约,确切的租赁和租赁。 在所有租赁到存储位置到期后,服务器将回收存储位置。